LXA/LXC Busbar Trunking System

sivacon8PS 

Busbar trunking 

systems LXA/LXC 

over 800 A 

Technical Information LV 72.T • 2004

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SIVACON 8PS 

Busbar Trunking 

Systems LXA/LXC 

over 800 A 

Technical Information 

LV 72.T · 2004 

© Siemens AG 2004 

s 

Introduction 

System Overview 

LXA/LXC Busbar Trunking System 


Annex 

1 

2 

3 

4 

5

2 

Siemens LV 72.T · 2004

Introduction 

1/2 Welcome to Automation and Drives 

1/3 Low-voltage switchgear - 

the basis for progressive solutions 

1/4 Totally Integrated Automation - 

innovations for more productivity 

1/6 Totally Integrated Power - 

energy distribution and management 

from one source 

1/8 SIVACON 8PS – 

Busbar Trunking Systems in Action 

1/10 SIVACON 8PS – 

Engineering Tools for precisely 

dimensioned, economical solutions 


Welcome to 


We would like to welcome you to Automation 

and Drives and our comprehensive range of 

products, systems, solutions and services for 

production and process automation and 

building technology worldwide. 

WithTotally Integrated Automation and 

Totally Integrated Power, we deliver solution 

platforms based on standards that offer you 

a considerable savings potential. 

Discover the world of our technology now. If 

you need more detailed information, please 

contact one of your regional Siemens 

partners. 

They will be glad to assist you. 

1/2

Low-voltage switchgear and controlgear – 

the basis for progressive solutions 

Everyday life would be unimaginable without electric power. Competence and innovations 

in switching and electrical installation technology are prerequisites so that power can be 

used without danger and user-friendly in industrial facilities and buildings. We have been 

providing you with these prerequisites for more than 110 years and are permanently developing 

new features – innovations which permit you to use power more safely and economically. 

Low-voltage switchgear from Siemens offers a comprehensive and innovative range of 

products covering switching devices for load feeders or the distribution of power, control 

and signaling devices as well as complete cabinet systems. Multi-functional, uniform concepts 

such as Totally Integrated Power, Safety Integrated or ECOFAST additionally permit 

our product portfolio to be combined into optimized systems. 

All in all, we can provide you with innovative components for switching and electrical installation 

technology which utilize state-of-the-art features such as integration and communication 

as the basis for advanced and uniform solutions which provide you with many 

benefits. 

1/3

Industrial 

Industrial 

Ethernet 

PROCESS FIELD 

PROFIBUS 

Ethernet 

AS-Interface 

GAMMA instabus 

1/4 

Control 

Safety Integrated 

Totally Integrated Automation – 

innovations for more productivity 

Withthe launchof Totally Integrated Automation in 1996, we 

were the first ones on the market to consistently implement 

the trend from equipment to an integrated automation 

solution, and have continuously improved the system ever 

since. 

Whether your industry is process- and production-oriented or 

a hybrid, Totally Integrated Automation is a unique "common 

solution" platform that covers all the sectors. 

Totally Integrated Automation is an integrated platform for the 

SIMATIC NET 

Industrial 

Communication 

ERP 

Enterprise 

Resource 

Planning 

MES 

Manufacturing 

Execution 

Systems 

SINAUT Telecontrol 

System 

SIMATIC 

PC-based Automation 

Building 

Technology 

Ethernet 

Production 

Order 

Management 

Production 

Operations 

Recording 

SIMATIC 

Machine Vision 

Ethernet 

SIMATIC 

Software 

Micro-Automation 

and 

Actuator-Sensor 

Interface Level 

Material 

Management 

Equipment 

Management 

Industrial Wireless 

Communication/ 

MOBIC 

ECOFAST IP65 

Decentral 

Automation System

SIMATIC 

Controller/ 

Automation 


PROFIBUSPA 

SIMATIC IT Framework 

Production Modeler 

SENTRON 

Circuit 

Breakers 

Field Instrumentation/ 

Analytics 

entire production line - from receiving to technical processing 

and production areas to shipping. Thanks to the system-oriented 

engineering environment, integrated, open communications 

as well as intelligent diagnostics options, your plant now 

benefits in every phase of the life cycle. 

In fact, to this day we are the only company worldwide that 

can offer a control system based on an integrated platform 

for boththe production and process industry. 

SIMATIC 

Distributed 

I/O 

HART 

Sensor 

Technology 

IQ-Sense 

SIMATIC PCS 7 

Process Control 


SIMOCODE-DP 

Motor 

Protection 

and Control 

Plant 

Information 

Management 

Detailed 

Production 

Scheduling 

SINUMERIK 

Numeric 

Control 

SIMODRIVE 

Product Specification 

Management System 

Laboratory Information 

Management System 

SIMOTION 

Motion Control 


SINAMICS 

SIMATIC HMI 

Human Machine 

Interface 

Drive Systems 

1/5

1/6 

Totally Integrated Power – 

energy distribution and management 

from one source 

Totally Integrated Power by Siemens offers integrated 

solutions for energy distribution in functional and industrial 

buildings covering everything from medium-high voltage to 

power outlets. 

Totally Integrated Power is based on integration in 

planning and configuration as well as coordinated products 

and systems. In addition, it features communications and 

software modules for connecting power distribution systems 

to industrial automation and building automation, thereby 

offering a substantial savings potential. 

Communications 

Process/production 

automation 

Products and systems 

Planning and configuration 

PROCESS FIELD BUS 

HMI Load 

Graphs Prognoses 

management 

U 

I 

coso 

P 

W 

£ 110 kV

Maintenance 

Substation 

Distribution 

Maintenance 

task 

Hall 1 Air conditioning system 

checkup 

Distribution 3 Replacing circuit 

breaker contacts 

Infeed II Replacing meters 

Message/ 

error 

management 

central ON 

OFF 

local ON 

OFF 

tripped 

Selective 

protection 

Protocols Power 

DATE: 

quality 

EMPLOYEE 

COST CENTER 

PAY PERIOD BEGINNING 

PAY PERIOD ENDING 

DATE 

SUN MON TUE WED THUR FRI SAT SUN TOTAL 

IN 

OUT 

IN 

OUT 

OVERTIME 

TOTAL HOURS 

DATE 


IN 

OUT 

IN 

OUT 

OVERTIME 

TOTAL HOURS 

DATE 


IN 

OUT 

IN 

OUT 

OVERTIME 

TOTAL HOURS 

CODES 

V=VACATION 

H=HOLIDAY 

S=SICK 

REGULAR HOLIDAY OTHER 

OVER THE HOURS 

SICK VACATION 

TIME & ONE-HALF 

Cost center 

instabus EIB 

Building 

automation 

1/7

Busbar trunking systems in the low-voltge range 

perform the safe and reliable transmission and 

distribution of electrical power from transformer 

via main distribution board and sub-distribution 

board right to the load. Siemens busbar trunking 

systems are the complete and efficient answer 

in this area: 

• The CD system for 25 A up to 40 A 

• The BD01 system for 40 A up to 160 A 

• The BD2 system for 160 A up to 1250 A 

• The PEC system for 800 A up to 6000 A 

• The LD system for 1100 A up to 5000 A 

• The LX system for 800 A up to 6300 A 

Alle these systems are ’Type-tested LV switchgear 

assemblies’ (TTA) to IEC 60 439-1 and -2. 

This ensures that they offer a standard of safety 

and reliability that meets the particularly high 

performance expectations of automated production 

and for building services provision. 

Performance characteristics: 

• Clear network structure 

• Unproblematic retrofitting in the event of load 

changes 

• Low operating costs due to uninterrupted serviceability 

• Simple planning and installation 

Room-covering systems for lighting installations 

and small loads 

The CD system (up to 40 A) allows you to supply 

lighting installations covering the whole expanse 

of, say, furniture showrooms, supermarkets 

or greenhouses with power, and also provides 

the means to easily fix them in position. 

Due to its pleasing appearance, the equipment 

is well suited for use in sales rooms visited by 

the public. On the other hand, its high degree of 

protection, to IP54, allows the CD system to be 

used even in harsh environments. 

The power source for loads with no fixed 

location 

The BD01 system is ideally suited for the power 

supply (up to 160 A) in workshops and trade 

premises. The trunking units are easy and quick 

to put together. The anti-rotation feature on the 

tap-off units makes sure that the units are 

correctly fitted and allows for easy retrofitting 

even while the production is running. 

Other benefits: minimum stock holding and uncomplicated 

planning due to one standard 

frame size for five different current ratings. 

1/8 

SIVACON 8PS - 

Busbar Trunking Systems in Action 

The BD 01 system is quick to install and 

ideally suited for use in workshops and 

trade premises, as here, at a photographer’s. 

The ideal system for production lines 

needing a great deal of power is the LD 

system up to 5000 A. 

In the petrochemical industry, it is the PEC system that provides 

reliable and fault-free power supply.

Siemens offers modular component cabinets for indication, control and monitoring of the 

flow of power through busbar trunking systems. These cabinets are equipped with bus 

interfaces, control circuit devices and power meters. 

The LX busbar trunking system is the perfect equipment for multistorey 

buildings where large quantities of power need to be transported, 

uninfluenced by the mounting position of the system. 

Universal power distribution 

The BD2 system (up to 1250 A) can supply 

power to medium-size loads in buildings and in 

all industrial applications. Prefabricated tap-off 

units fitted with many differing component 

combinations make this equipment universally 

applicable. Two standard frame sizes covering 

all current ratings simplify stock keeping and 

planning. 

Safe and reliable power transmission in the 

petrochemical industry 

The PEC resin-insulated system, up to 6000 A, 

has a high degree of insulation protection and 

thus an enormous resistance to external interference 

factors. This ensures safe and reliable 

transport of power even in rough weather or in 

highly dust and dirt and corrosion polluted 

industrial environments. Typical applications of 

this system is the petrochemical industry, waste 

incinerators and power stations. 

High system serviceability in production 

The louvred LD busbar trunking system, up to 

5000 A, is the system for transporting current in 

production lines with a large energy requirement, 

such as in the automotive industry. A 

separate PE busbar ensures that the protective 

device in such a system responds reliably even 

if the current paths are relatively long. The high 

short-circuit rating allows medium-voltage 

switches to be used as protective elements for 

the transmission of power between transformer 

and main circuit-breaker. Tap-off units up to 

1250 A available as standard. 

Flexible power distribution in multi-storey 

buildings 

The LX sandwich-style system, up to 6300 A, is 

used where large quantities of power need to be 

transported, uninfluenced by the mounting position 

of the system. 

Conductor configurations with the PE conductor 

insulated along its entire length, and a doublesize 

neutral can ensure the interference-free distribution 

of power in places such as radio 

stations, computer centres or at internet 

providers’. The system is protected to IP54 as 

standard, and tap-off units up to 1250 A available 

as standard. 

1/9

Engineering tools from Siemens help generate 

precisely dimensioned and economical planning 

and design solutions, even for complex applications. 

MatSelect 

Using MatSelect, product and material data can 

be administered with self designed or 

standardised classification systems. It has interfaces 

to Eldanorm, Datanorm, ASCII format and 

ProPlan. 

NetPlan 

Planning software for power flow, short-circuit 

calculation and device dimensioning with selectivity 

analysis and protective against electric 

shock of low-voltage networks, available in 

English, German, French and Italian. 

NetSelect 

Selection software for protective switches to enable 

star networks to be correctly dimensioned; 

available in several languages. 

BusbarSelect 

Selection aid for generating quotations, invitations 

to tender and orders for busbar trunking 

systems up to 1250 A; available in several 

languages. 

Quotation texts 

Prepared texts (in German) for generating 

customer specifications in the formats: Architext 

excellent, GAEB 81 and Word 97. 

Should you have any queries concerning installation, 

functionality or application options – 

please mail us at 

sbts.tool_support@siemens.com 

We will be pleased to assist you. 

1/10 

SIVACON 8PS - Engineering Tools for 

precisely dimensioned, economical solutions 

Netplan enables you to graphically represent the network and to 

calculate the load flow and the prospective one-pole to all-pole short 

circuitcurrent/load. 

In BusbarSelect you select the trunking units for your system from a menu, 

and then transfer them into an order or quotation list.


2/2 System description 

2/6 System selection criteria 


2 


System description 

Developing a power distribution concept, including system and 

component configurations, involves finding an effective solution 

based on customer requirements and supplier technology. This 

design information brochure for the LX busbar trunking system for 

rated currents ranging from 800 A to 6300 A, is designed to help 

with this task. 

Descriptions of the different systems, their technical features and 

areas of application are provided, as well as drawings of the individual 

busbar trunking system elements. Details vital for planning 

are emphasized and explained. 

The section entitled, “Further Information” suggests approaches for 

creating effective planning solutions. Individual engineering principles 

are introduced and detailed information on subjects such as fire 

barriers and functional endurance is provided. 

Siemens offers services and engineering tools for preparing tender 

specifications. An overview and explanation of functions and 

features is also included in this section. 

General 

Creating a design concept for a power supply system, not only 

involves observing applicable standards and regulations, but also 

examining and clarifying economic and technical requirements. 

Electrical equipment, such as distribution boards and transformers, 

should be selected on the basis of their suitability in terms of the 

overall system – not just in terms of their individual features. 

Components should not only be appropriate for rated operation, but 

should also be suitably dimensioned to withstand fault situations. A 

power distribution concept should also take the following points 

into consideration: 

– Building type, use and form (for example, high-rise building, flat 

buildings and number of floors) 

– Load centers and possible supply paths and locations for 

transformers and main distribution boards 

– Building-dependent ratings based on maximum demands per 

unit area depending on what the building is used for 

– Regulations and guidelines of building authorities 

– Power supply company guidelines. 

2/2 

Siemens LV 72.T · 2004 

There will always be more than one possible solution which will 

have to be assessed in terms of its technical and economic 

advantages and disadvantages. In making this assessment, the 

following requirements should be a priority: 

– Simple and transparent design 

– Long service life 

– High availability 

– Low fire load 

– Flexible adaptation to building modifications. 

These requirements are generally easy to meet with appropriate 

busbar trunking systems. For this reason, engineers increasingly 

favour busbar trunking systems over cable installations for power 

transmission and distribution applications. Siemens offers busbar 

trunking systems for rated currents ranging from 25 to 6300 A: 

– The CD busbar trunking system for 25 to 40 A is ideal for 

supplying lights and small consumers 

– The BD01 busbar trunking system for 40 to 160 A is designed for 

supplying workshops with tap-offs up to 63 A 

– The BD2 busbar trunking systems for 160 to 1250 A is designed 

for supplying medium-sized consumers in buildings and in 

industry 

– The ventilated LD busbar trunking system is designed for 

supplying consumers with a high power consumption in industrial 

applications 

– The LX sandwich system is designed for supplying large power 

requirements in buildings 

The design information brochure LV 71.T is available for designing 

the BD2 and LD busbar trunking systems.

BD2 

 

 

 

 

 

LD 

 

 

Figure 1: busbar trunking systems 

BD01-KB 

BD01 

CD 

BD01-KB 

BD01 

LD LX 


LX 


 

 

 

 

 

 

 

 

 

Siemens LV 72.T · 2004 2/3 

2

2 



Purpose and types of busbar trunking systems 

The complexity of today‘s buildings makes power distribution with 

a high level of transparency and flexibility an indispensable requirement. 

The uninterrupted provision of power is also absolutely essential 

for production plants with multiple shifts. 

Busbar trunking systems meet these demands for an economical 

power distribution system with simple design, fast installation, 

optimum flexibility and safety by offering: 

– Straightforward network structures 

– Minimum space requirements 

– Easy retrofitting with sudden changes in location and consumer 

ratings 

– High short-circuit rating and low fire load 

The LX busbar trunking system is a type-tested low-voltage 

assembly (TTA) in accordance with IEC/EN 60 439-1 and 2 in the 

form of an aluminium enclosed sandwich system. The LX sandwich 

2/4 


system consists of busbars, insulation, the aluminium enclosure and 

the fastening and connection elements. 

Figure 2: LX trunking unit with joint block

Purpose and types of busbar trunking systems 

Various busbar trunking system components are responsible for 

transporting power between transformers and low-voltage power 

distribution systems. They are used between the transformer and 

main distribution board and then on to the subdistribution level. 

Trunking units without tap-off points, available in standard lengths, 

are used for transporting power. In addition to the standard lengths, 

customers can select lengths from several ranges to meet their 

particular building requirements. 

Power distribution 

The main application of busbar trunking systems is power distribution. 

The advantage of such systems over cable installations is that 

the locations of power tap-off points are not permanent, – but can 

be moved to any position within the entire system. To tap power at 

any given point simply requires positioning a tap-off unit at that 

location on the busbar. 

The result is a flexible distribution system for decentralized power 

supply to a particular line or area. Tap-off points can be mounted on 

one or both sides of straight trunking units. 

The LX busbar trunking system provides tap-off units from 80 A to 

1250 A for power tap-offs and for connecting consumers, providing 

the power supply for consumers in the range between 10 kW and 

over 400 kW. Tap-off units can be fitted with either fuse switches or 

circuit-breakers. 

Figure 3: Tap-off units for flexible power tapping 



With all busbar trunking systems, pluggable tap-off units have a 

high safty standard, the following requirements will be full filed by 

all tap-off units: 

– Early-make PE contact for mounting and late-break contact for 

removing 

– With the cover open, no live part can be accessed (protection 

IP2X). 

– Mounting should only be possible in the correct phase sequence. 

The plug-in LX tap-off units up to 630 A meet these requirements. 

The LX tap-off units from 800 A to 1250 A are fitted permanently to 

the connection points of the trunking units and cannot be fitted/ 

removed while the system is live. Installation is only permissible 

when the system is isolated. 

Siemens LV 72.T · 2004 2/5 

2

2 


System selection criteria 

Selection of LXA/LXC or LDA/LDC 

2/6 


LXA/LXC LDA/LDC 

Rated operational voltage Ue VAC 690 1000 

Standard degree of protection IP54 IP341) Rated current Ie 

Permissible load (Ie) depending on 

A 800 – 6300 1100 – 5000 

Mounting position 

Horizontal edgewise % 100 100 

Horizontal, flat % 100 59 – 68 

Vertical % 100 76 – 88 

IP54 protection % 100 64–82 

Rated short-time withstand current Icw (1 s) 

Conductor configurations 

kA 25 – 150 55 – 116 

L1, L2, L3, PE = Enclosure K – 

L1, L2, L3, m PEN – K 

L1, L2, L3, PEN K K 

L1, L2, L3, N, PE = Enclosure K – 

L1, L2, L3, m N, PE = Enclosure – K 

L1, L2, L3, N, PE K K 

L1, L2, L3, 2 N, PE = Enclosure K – 

L1, L2, L3, 2 N, PE K – 

L1, L2, L3, N, (PE) 2) , PE = Enclosure K – 

L1, L2, L3, 2 N, (PE) 2), PE = Enclosure 

Dimensions width x height 

K – 

Al systems/1000 A and Cu systems/1250 A mm x mm 145 x 137 180 x 180 





Al systems/4000 A and Cu systems/5000 A 

Fire load 

mm x mm 145 x 599 240 x 180 

Tap-off unit without tap-off point kWh/m 1.83 – 16.32 4.16 – 8.83 

Per tap-off point kWh/m 2.9 7.8 – 10.8 

1) Taking current reduction into account also available with IP54 protection 

2) (PE) = Additional insulated PE conductor (clean earth) 

3) Voltage drop in millivolts per1mperampere, 3-phase 50Hz, cos v = 0.9, with a fully symmetrical load, 

concentrated load tap-off and supply from one end 

4) Magnetic field values given in microtesla with a fully symmetrical load at a distance of 0.5 m from the busbar system 

(the measuring points are in the axis from direction 3 and direction 7 h see chapter Further Information under Magnetic Fields)

Voltage drop 3) 


LXA/LXC LDA/LDC 

Al systems/1250 A mV/A/m 0.127 0.116 



Cu systems/2000 A mV/A/m 0.064 0.089 

Cu systems/5000 A 

Magnetic fields 

mV/A/m 0.02 0.03 

4) 

Al systems/1600 A mT 10.84 10.60 

Al systems/2500 A mT 20.54 9.00 

Al systems/4000 A mT 30.62 13.00 

Cu systems/2000 A mT 11.66 9.70 

Cu systems/5000 A 

Max. fixing intervals 

mT 37.22 14.40 

Al systems m 2 – 3 5– 6 

Cu systems m 2 – 3 2 – 3 

Tap-off units can be changed when system is live 

Maximum number of tap-offs with pluggable tap-off units 

over 3 m length when using tap-off units 

A 80 – 630 80 – 1250 

From 80 to 125 A 6 3 

From 160 to 630 A 4 3 

From 800 to 1250 A 0 2 

Tap-off units with fuses A 100 – 630 80 – 630 

Rated conditional short-circuit current Icf kA 100 (80) 120 

IEC standard K K 

BS standard K – 

NF standard K – 

Tap-off units with circuit-breaker 

Rated conditional short-circuit current Icc 

A 80 – 1250 80 – 1250 

For size 1 to 125 A kA 65 100 

For size 2, 3, 4 to 630 A kA 65 100 

For size 5 to 1250 A kA 85 (100) 100 

Manual operation K K 

Remote operation – K 


Siemens LV 72.T · 2004 2/7 

2

2 



Building applications Industrial applications 

LXA/LXC and LDA/LDC systems are available for distributing large 

power requirements in buildings. For this type of application busbar 

trunking systems frequently have to meet the following requirements: 

– Flexible power distribution in high-rise buildings 

– Safe power supply for electronic consumers 

To meet these requirements the LXA/LXC systems have very favourable 

features in terms of design, high load capacity of the neutral 

conductor as well as an additional isolated PE conductor. 

Nevertheless, there are applications for which use of the LDA/LDC 

system is recommended. LD systems are ideally used in applications 

with primarily horizontal busbar runs and required protection to 

IP34. 

2/8 


When used in industrial applications, busbar trunking systems have 

to meet a high level of requirements in terms of short-circuit ratings. 

In power supply systems for manufacturing plants with a high power 

requirement, such as with welding robots in welding lines, very high 

short-circuit currents can occur that require the use of very robust 

consumer tap-offs. The LDA/LDC systems are ideal busbar trunking 

systems for typical industrial applications. LXA/LXC systems may, 

however, also be useful in particular industrial applications such as 

in operating areas exposed to fire hazards. In this kind of application 

protection to IP5x is required, where there is a risk of fire due to 

inflammable dust. 

Sector Selection criteria LX LD 

Building applications 

Banks, 

insurance companies 

Internet providers, IT centres, 

broadcasting buildings 

Shopping centres, furniture stores, trade 

fairs, airports, hospitals, clinics, offices 

Industrial applications 

Automotive, metalworking, machine 

building, computers, microchips, 

telecommunications, chemical, 

pharmaceutical, food processing 

industries 

– Power distribution in multi-storey buildings requiring primarily vertical busbar runs, 

fire load 

– Electronic consumers subject to harmonics overload the neutral conductor 

– Interference potentials in the enclosure impair functioning of the consumer 

– High density of consumer tap-offs in a small space 

– Power distribution requires vertical busbar runs 

– Electromagnetic field emissions of power transfer unit impair operation of consumers 

in the vicinity 

– Power distribution in multi-storey buildings requiring primarily vertical busbar runs 

and IP34 protection is sufficient 

– Pluggable consumer tap-offs up to and including 1250 A 

– High short-circuit rating of consumer tap-offs Icc = 100 kA/Icf = 120 kA 

– Electronic consumers subject to harmonics overload the neutral conductor 

– Interference potentials in the enclosure impair functioning of the consumer 

– Pluggable consumer tap-offs up to 630 A are sufficient 

– IP54 protection required 

K – 

K – 

K – 

– K 

– K 

K –


IEC 364 stipulates that electrical equipment must be selected 

according to the type of system at hand in order to determine the 

protective measures required. For the LX system this selection is 

based on the appropriate conductor configuration. 

System type Conductor configuration 

TN-C LX...41 

TN-C-S 

TN-S LX...51 

LX...52 

LX...53 

LX...54 

LX...61 

LX...62 

TT LX...51 

LX...52 

LX...53 

LX...54 

IT LX...30 

1) 

1) An appropriate conductor configuration is not available as an 

LX system. However, the PEN conductor can be divided into an 

N and PE conductor in the tap-off unit when using an 

LX..41 4-conductor system. 

Cross-sections for PEN, N, PE conductors compared to the conductor cross-section 

The following tables compare the conductor cross-sections 

L1, L2, L3, PEN, N, PE and clean earth of different conductor configurations. 

The appropriate values in mm 2 are contained in the Technical 

Data. 

System Cross-sections 



N and PE conductor cross-sections/clean earth 

Neutral conductor cross-section 

The rise in new electronic consumers that are sensitive to interference, 

particularly near the power supply in the building, is 

presenting busbar trunking systems with new challenges. Interference 

from electromagnetic fields and harmonics in the mains supply 

impair the correct functioning of computers, servers and many other 

state-of-the-art electronic devices. Particularly, the large number of 

AC consumers in a mains supply place a high load on the neutral 

conductor on account of the resulting harmonics. Double neutral 

conductor cross-sections (200 %) reduce the susceptibility of the 

system in networks subject to harmonics. 

PE conductor cross-section 

A large PE conductor cross-section also provides optimum safety for 

the power supply since the reduced loop impedance ensures rapid 

interruption of short-circuit currents. This consequently reduces the 

risk of possible downtimes thanks to the rapid disconnection of 

upstream protective devices. 

Clean earth 

Insulated PE conductors offer optimum reliability and safety in the 

power supply of electronic consumers in buildings on account of 

their complete insulation from the busbar enclosure. In the event of 

a short-circuit between the phase and the consumer enclosure this 

PE conductor (clean earth) is not affected by this fault and is therefore 

potential-free during a short-circuit to an exposed conductive 

part. Even leakage currents in the enclosure due to magnetic fields 

do not affect the clean earth. The clean earth is therefore ideal as 

the PE connection for susceptible electronic loads. 

L1, L2, L3 PEN N PE Clean earth 

LX..30 100 % – – Enclosure – 

LX..41 100 % 100 % + Enclosure – – – 

LX..51 100 % – 100 % Enclosure – 

LX..52 100 % – 200 % Enclosure – 

LXC.53 1) 100 % – 100 % 100 % + Enclosure – 

LXC.54 1) 100 % – 200 % 100 % + Enclosure – 

LX..61 100 % – 100 % Enclosure 100 % 

LX..62 100 % – 200 % Enclosure 100 % 

1) Each conductor configuration contains an additional busbar as PE conductor. The PE conductor is electrically connected to the enclosure. 

Siemens LV 72.T · 2004 2/9 

2

2 



Enclosure cross-section compared to conductor 

cross-section (Cu equivalent) 

System Enclosure cross-section 

LXA(C)01.. 324 % 


LXC03.. 230 % 

LX(C)A04.. 173 % 






LXA10.. 84 % 

Example: 

What are the cross-sections of systems for: 

a) LXA0461 

L1, L2, L3, N, clean earth: 100 % 

PE (enclosure): 173 % in Cu equivalent 

b) LXC0554 

L1, L2, L3: 100 % 

N: 200 % 

PE (enclosure + busbar): 219 % in Cu equivalent 

2/10 


Rated currents and short-circuit currents of standard transformers 

Rated voltage UN 400/230 V 690/400 V 



Relative short-circuit voltage uk 4% 1) 6 % 2) 4% 1) 6 % 2) 

Rated power Rated current Short-circuit current 

kVA 

A 

3) 

Rated current Short-circuit current 

I"k 

A 

A 

3) 

I"k 

A 

50 72 1805 – 42 1042 – 

100 144 3610 2406 84 2084 1392 

160 230 5776 3850 133 3325 2230 

200 288 7220 4812 168 4168 2784 

250 360 9025 6015 210 5220 3560 

315 455 11375 7583 263 6650 4380 

400 578 14450 9630 336 8336 5568 

500 722 18050 12030 420 10440 7120 

630 909 22750 15166 526 13300 8760 

800 1156 28900 19260 672 16672 11136 

1000 1444 36100 24060 840 20840 13920 

1250 1805 45125 30080 1050 26060 17480 

1600 2312 57800 38530 1330 33300 22300 

2000 2888 72200 48120 1680 41680 27840 

2500 3612 90300 60200 2094 52350 34900 

3150 4546 113650 75780 2636 65893 43933 

1) uk = 4 %, standardized to DIN 42500 for SNT = 50 – 630 kVA 

2) uk = 6 %, standardized to DIN 42500 for SNT = 100 – 1600 kVA 

3) I"k = Initial symmetrical short-circuit current of transformer when connected to a system with unlimited short-circuit capacity 

Approximation formula 

Rated current of transformer Short-circuit current of transformer 

IN [A]=kx SNT [kVA] I"k = IN/uk x 100 400 V: k = 1.45 

690 V: k = 0.84 

Siemens LV 72.T · 2004 2/11 

2

2 



LXA/LXC selection depending on transformer rated values 

Transformer rated values LX system 

Rated current Rel. shortUninter- Peak short- Type Rated current 

circuitruptedcircuit voltage short-circuit 

current 

current 

I 

uk I"k 

Ipk 

Ie 

A 

% 

kA 

A 

2/12 


kAeff 

910 6 15.15 38.58 LXA02 

LXC01 











3609 6 60.11 153.10 lXC09 


1000 

1000 

1250 

1250 

Rated short-time 

withstand 

current 

4546 6 75.78 192.90 LXC09 5000 150 255 

Figure 1: Connecting a transformer to a distribution board 

1600 

1600 

2000 

2000 

2500 

2500 

3200 

3200 

4000 

4000 

Icw 

kAeff 

35 

38 

50 

50 

60 

60 

75 

75 

86 

86 

100 

100 

140 

150 

Rated impulse 

withstand 

current 

Ipk 

kA 

70 

80 

110 

110 

132 

132 

158 

165 

194 

189 

220 

220 

220 

255 

■

LXA/LXC Busbar Trunking 


3/2 System description 

3/4 System components 

3/21 Technical Data 

3/39 Dimension drawings 


3 



3/2 


The LX busbar trunking system is used for 

both power transmission and distribution. 

The system offers an outstanding level of 

flexibility in terms of location requirements 

and is particularly suitable for power distribution 

in multi-storey buildings. The high 

degree of protection to IP54 as well as tapoff 

units up to 1250 A also guarantee safe 

power distribution for the high energy 

requirements of industrial applications. 

1 Straight trunking units 

With or without fire barrier, 

fire resistance class 

S 120 DIN 4102 Part 9 

Degree of protection IP54, 

(IP55 on request) 

Conductor configuration 

– Standard lengths 

3 m/2 m/1 m 

– Optional lengths of 

0.35 – 2.99 m 

– For horizontal and vertical installation 

Straight trunking units with tap-off 

points 

– Tap-off points on one side 

– Tap-off points on both sides 

– Protection against direct contact to IP20 

during fitting and 

removal of tap-off units 

– Correct orientation feature: protection 

against incorrect 

connection (key-into-lock principle) 

a Page 3/11 

2 Pluggable Tap-off units 

With either fuse switch-disconnectors or 

circuit-breakers 

Early-make PE(N) connection contact during 

fitting 

Safety resulting from fixed fitting/removal 

sequence 

Sheet steel enclosure degree of protection 

IP54 

Protection against direct contact IP20 during 

fitting 

Permanently installed tap-off units 

Fitted with circuit-breakers 

Safety resulting from fixed fitting/removal 

sequence 

Sheet steel enclosure degree of protection 

IP54 

Protection against direct contact IP20 during 

fitting 

Tap-off via joint block 

a Page 3/16 

3 Feeder units 

Transformer feeder units, enclosed 

– For rated currents from 

800 A – 6300 A 

– Connection lugs for all normal spacings 

– Phase sequencetospecification 



Distribution board feeder units 


800 A – 5000 A 

Cable feeder units 


800 A – 3200 A 

– Cable entry via cable grommets with cable 

anchoring rail 

a Page 3/14 

4 Connection to Siemens power 

distribution systems 

For distribution connection to from 

–above 

– below 

a Page 3/13 

5 Junction units 

For flexible engineering to adapt to structural 

features with 

– Elbow, offset elbow 

– Knee, offset knee 

– Z units 

– T units 

a Page 3/11 

6 Accessories 

End flange 

Joint block 

Fixing bracket 

Connection tool 

a Page 3/20 

Siemens LV 72.T · 2004 3/3 

3

3 


System components 

Preliminary comments for tender specifications 

Basic description of busbar trunking systems 800 A to 

6300 A 

Busbar trunking systems can be supplied as type-tested low-voltage 

switchgear and controlgear assemblies (TTA) that are ready to 

connect and install. 

The following information is part of the calculation and contractual 

elements. It must be taken into account with the descriptions of the 

individual systems and related equipment, even if they are not 

mentioned in detail. 

The busbar trunking system must be suitable for transporting 

energy, for example, between transformers and low-voltage subdistribution 

boards, for distributing energy in order to supply entire 

areas, as well as for both horizontal and vertical installation. 

The busbar trunking system must consist of listed system modules 

such as: 

– Straight trunking units with/without tap-off points 

– Feeder units for transformer, distribution board and cable feeder 

units 

– Junction units with elbow, offset elbow, knee, offset knee, Z units 

and T units 

– Tap-off units 

All units must be available from the factory in standard and optional 

lengths. Flexible junction units and standard junction units as cable 

units are not permitted. Expansion units and fixed points must be 

designed as required. 

The trunking units with tap-off openings must be fitted with 

pluggable tap-off units as required. The location and number of tapoff 

points must be optional. The pluggable tap-off units are 

protected against incorrect mounting (180° orientation feature). 

The permanently installed tap-off units can only be fitted or 

removed when the system is de-energized and should be protected 

against incorrect mounting (180° orientation feature). Depending 

on the version being used, isolation of the pluggable tap-off units 

during removal is ensured either through a compulsory sequenceof 

operations or cautionary instructions. 

If necessary, the busbar trunking system can be equipped with an 

asbestos-free fire barrier for the wall or ceiling openings which 

complies with fire resistance class S120. 

3/4 


The enclosure is made from aluminium with a light grey RAL7035 

paint finish. The cross-section of the trunking units must not exceed 

the specified dimensions in the Technical Data. The connection 

point of two trunking units must not protrude above the external 

level of the enclosure run. 

The individual system modules must be connected by tightening a 

state-of-the-art single-bolt clamp. The conductors between two 

system units should not be connected with screws. 

The busbars must be made from aluminium or copper and be 

isolated along their entire length, nickel-plated (aluminium) and tinplated. 

The conductor cross-sections should not be below the values 

given in the Technical Data. 

Fire load should not exceed the value given in the Technical Data. 

Conformity and test certificates 

The manufacturer of the busbar trunking system must maintain and 

certify an EN/ISO 9001 quality management system. 

Certificates or declarations ofconformity must confirm the following 

qualifications for the entire system: 

– Type testing according to IEC/EN 60 439-1 and -2 (DIN VDE Part 

500 and Part 502) 

– Climatic proofing to DIN IEC 68 Part 2-3 and Part 2-30 

– Fire barrier to DIN 4102 Part 12 

– Proof that system is maintenance-free 

– Freedom from silicon or halogens 

– Separate busbars for PE 

Reliable proof of special, additional features (such as sprinkler test) 

of system components must be available.

Technical data for LXA/LXC busbar trunking system 

Ambient temperature 

min./max./24-hour average –5/+40/35 °C 

Protection type IP54 

Torque setting for joint block 120 + 10 Nm 

Busbar surface treatment Insulated over the entire length 

Trunking unit material Paint finish aluminium housing 

Colour of trunking units RAL 7035 (light grey) 

Rated insulation voltage Ui 

690 V AC, 800VDC 

Rated operational voltage Ue 

Up to 690VAC 

Rated frequency f 50 Hz 

Rated current Ie 

_______1) Rated short-time withstand current 

– Phase conductors Icw (1s) 

– Neutral conductor Icw (1s) 

–5thconductor Icw (1s) 

Rated peak withstand current Ipk 


_______ 1) 

_______ 1) 

_______ 1) 

_______ 1) 

Conductor material AL/CU 2) 

Number of busbars _______ 1) 

Conductor cross-sec. 

–L1,L2,L3 

–N 

– PE (equivalent copper cross-section) 

– Insulated PE conductor (clean earth) 

Fire loads 

– Tap-off unit without tap-off point 

– Per tap-off point 

Max. fixing intervals 

– Horizontal edgewise 

– Horizontal, flat 

_______ 1) 

_______ 1) 

_______ 1) 

_______ 1) 

_______ 1) 

2.9 kWh 

_______ 1) 

2m 

Enclosure dimensions _______ 1) 

Weight _______1) 1) Enter the values from the Technical Data for the system you selected. For values see Technical Data. 

2) Cross out information which does not apply. 


Siemens LV 72.T · 2004 3/5 

3

3 



Type reference key 

The basiccomponents of the LX system are determined using a type 

reference key. The type is defined and selected according to the rated 

current, conductor material, system type and conductor configuration. 

Rated current Ie [A] 

Al Cu Code 

800 1000 01 

1000 1250 02 

– 1400 03 

1250 1600 04 

1600 2000 05 

2000 2500 06 

2500 3200 07 

3200 4000 08 

4000 5000 09 

4500 – 10 

1) PE conductor = Enclosure 

2) Separate PE conductor by means of an insulated busbar (clean earth) 

3) Double cross-section of neutral conductor (200 %) by means of additional busbar 

4) PE conductor = Enclosure and additional busbar 

5) Only available as copper system (LXC) 

Selection example: 

A rated current of 2500 A is required for a given project. The 

conductor material to be used is aluminum. A 5-pole system is 

required. The cross-section of the N conductor should be equal to 

the cross-section of the phase conductor. 

The following type is therefore required: LXA0751 

3/6 

Conductor material 

Al A 

Cu C 


The following type reference key permits precise definition of the 

system required. 

Code Conductor configuration: 

30 L1 + L2 + L3 + PE1) 41 L1 + L2 + L3 + PEN/PEN4) 51 L1+L2 +L3 +N+PE1) 52 L1+L2 +L3 +N+N3)+PE1) 535) L1+L2 +L3 +N+PE/PE4) 545) L1+L2 +L3 +N+N3) + PE/PE4) 61 L1 + L2 + L3 + N + (PE) 2) +PE1) 62 L1+L2 +L3 +N+N 3) + (PE) 2) + PE/PE 1) 

Fire barrier 

Positioning X* 

LX . .. .. 

-.... +LX .. -S120-X..

Busbars 

The busbars of the LX busbar system are normally tin-plated and 

covered with highly resistant insulating material. The conductor 

material of the LXA system is aluminium and the conductor material 

of the LXC system is copper. Aluminum busbars are provided with 

both a tin and nickel plating. 

Figure 1: LXA, LXC busbar trunking systems 

a Aluminium busbar (LXA), Copper busbar (LXC) 

b Nickel layer, tin coating (LXA), tin coating (LXC) 

c High-temperature resistant insulation coating 

 

 

 


Mounting positions and rated current 


The sandwich-type construction of the LX busbar system means that 

its current carrying capacity is not affected by the mounting position, 

thus offering optimum flexibility in the design of busbar runs. 

Current reduction is not required for edgewise or flat busbar positions 

in both horizontal busbar runs and risers (vertical busbar runs). 

Figure 2: Busbar run horizontal, busbar position edgewise 

Figure 3: Busbar run horizontal, busbar position flat 

Figure 4: Busbar run vertical 

Siemens LV 72.T · 2004 3/7 

3

3 



Sizes 

The sizes depend on the rated current and the conductor material. 

There are a total of ten sizes. Seven sizes are designed as single 

systems and three sizes as double systems. 

Single systems consist of an enclosure with 3 to 6 aluminium or 

copper busbars. Double systems have between 6 and 12 busbars in 

two enclosures. 

The exact number of busbars depends on the conductor configuration 

required. 

Sizes (H x B 1)) 

Height H 

[mm] 

137 

137 

162 

162 

207 

287 

287 

145 

3/8 

H 

System Height H 

[mm] 

LXA(C)01 







1) Width B always 145 mm 


439 

599 

599 

145 

H 




LXA10


The LX busbar system is available in eight different conductor 

configurations, depending on the type of system required, the N and 

PE cross-sections and the possible additional insulated 

PE conductor (clean earth) 

a b c 

abcd 


System Conductor configurations Enclosure 

a b c d e f 


LX...30 L1 L2 L3 – – – Enclosure is the PE conductor 

LX...41 L1 L2 L3 PEN – – Electrical connection between 

enclosure and PEN 

LX...51 L1 L2 L3 N – – Enclosure is the PE conductor 

Siemens LV 72.T · 2004 3/9 

3

3 



abcde 

abcdef 

3/10 


System Conductor configurations Enclosure 

a b c d e f 

LX...52 L1 L2 L3 N N – Enclosure is the PE conductor 

LX...53 L1 L2 L3 N PE – Electrical connection between 

enclosure and PE 

LX...61 L1 L2 L3 N Clean 

earth 

– Enclosure is the PE conductor 

LX...54 L1 L2 L3 N N PE Electrical connection between 

enclosure and PE 

LX...62 L1 L2 L3 N N Clean 

Earth 

Enclosure is the PE conductor

Straight trunking units 

Straight trunking units for horizontal and vertical installation 

without tap-off points: 

Standard lengths 

1 m: LX.....-1 

2 m: LX.....-2 

3 m: LX.....-3 

Optional lengths: 

0.35 m – 0.99 m: LX.....-1W* 

1.01 m – 1.99 m: LX.....-2W* 

2.01 m – 2.99 m: LX.....-3W* 

L 

L 

LX-A 

LX-B 

LX-C 

LX-D 

LX-E 

Straight trunking units for horizontal and vertical installation with 

tap-off points: 

Standard lengths with up to 10 tap-off points 

3 m: LX.....-3-ADO-U+LX-A(B, C, D, E) 

2, 4, 6, 8 or 10 tap-off points selectable on both sides 

LX.....-3-AD+LX-A(B, C, D, E) 

1, 2, 3, 4 or 5 tap-off points selectable on one side 

2 m: LX.....-2-1AD 

1 tap-off point 

Optional lengths with 1 tap-off point 

1.50 m – 2.00 m: LX.....-1W*-1AD 

2.01 m – 2.50 m: LX.....-2W*-1AD 

2.51 m – 3.00 m: LX.....-3W*-1AD 


Junction units 

Elbow LX.....-L-X*/Y* 

For LX.01 to LX.10 

X= 0.35–1.09m 

Y = 0.35 – 1.09 m 

Y 

X 

Z unit LX.....-X*/Y*/Z* 


X/Y = 0.35 – 1.09 m 

Z = 0.40 – 0.70 m 

X 


Y 

Z 

Siemens LV 72.T · 2004 3/11 

3

3 



Knee LX.....-L-X*/Y* 


X/Y = 0.35 – 1.09 m 


X/Y = 0.50 – 1.21 m 


X/Y = 0.80 – 1.52 m 

* = Optional length in m 

Important planning information: 

The minimum limb lengths for X and Y (Z) with elbow and Z unit 

junction units depend on the standard enclosure width (145 mm), 

the knee junction unit depends on the changing enclosure height 

(depending on system size 137 mm, 162 mm, 207 mm, 287 mm, 

439 mm or 599 mm) 

3/12 


X 

Y 

Junction units 

Z unit LX.....-Z-X*/Y*/Z* 


X/Y = 0.35 – 1.09 m 

Z = 0.40 – 0.70 m 


X/Y = 0.50 – 1.21 m 

Z = 0.70 – 1.00 m 


X/Y = 0.80 – 1.52 m 

Z = 1.33 – 1.60 m 

Z 

Y 

Offset elbow LX.....-L-X*/Y*/Z* 


X/Y = 0.35 – 1.09 m 

Z = 0.40 – 0.70 m 


X/Y = 0.50 – 1.21 m 

Z = 0.52 – 0.85 m 


X/Y = 0.80 – 1.52 m 

Z = 0.84 – 1.15 m 

X 

Y 

X 

Z

X 

T unit LX.....-T-X*/Y*/Z* 


X/Y/Z = 0.35 – 1.09 m 


X/Y/Z = 0.50 – 1.21 m 


X/Y/Z = 0.80 – 1.50 m 

* = Optional length in m 

Important planning information: 

The minimum limb lengths for X, Y and Z with Z unit, offset elbow 

and T unit junction units depend on the changing enclosure height 

(depending on system size 137 mm, 162 mm, 207 mm, 287 mm, 

439 mm or 599 mm) 

Y 

Z 



Distribution board connection for Siemens power 

distribution systems 

Connecting the Siemens power distribution system as a type-tested 

low-voltage switchgear and controlgear assembly (TTA) as per IEC/ 

EN 60 439-1 and -2 

The power distribution board and LX busbar trunking system are 

connected using an integrated busbar trunking connection unit for 

rated currents up to 5000 A. This busbar connection can be made 

from above or below, thus ensuring flexible connections. The copper 

connections provided at the factory between the power distribution 

system and busbar trunking system offer a high short-circuit rating 

that is type-tested to ensure a high level of safety in power transmission. 

Siemens LV 72.T · 2004 3/13 

3

3 



Connection unit for non-Siemens distribution boards Connection units for transformers and distribution boards 

General 

To connect the busbar system to a non-Siemens distribution board, 

an LX.... - FA connection unit for non-Siemens distribution boards 

can be used. The connection unit is built into the distribution board 

and serves as an interfacetothecopper connections of the 

distribution system. 

Versions 

The connection units for non-Siemens distribution boards are 

normally made ofcopper. Eight different conductor configurations 

are available depending on the type of system in place. The rated 

currents up to 5000 A meet the specifications given in the Technical 

Data. In accordance with IEC/EN 60 439-1 and 2 temperature rises 

caused by current heat should not exceed the permissible temperature 

limit for power distribution systems. The maximum temperature 

for the insulated busbars is 135 °C. The terminal capacity for the 

copper connections can be found in the Technical Data. 

Installing the connection unit 

The distribution board manufacturer is responsible for designing 

and installing the copper connections of the distribution board’s 

connection unit, or this work must at least be carried out in 

accordance with the manufacturer’s instructions. The manufacturer 

must ensure that the required short-circuit rating is provided and 

that the permissible temperature limit of the connection unit for 

non-Siemens distribution boards is not exceeded. 

3/14 


The different rated currents, phase sequences and phase distances 

involved in transformers make for the wide range of transformers 

available. 

This calls for a high level offlexibility when it comes to connecting 

busbar systems. 

The universal connector unit can also be used for connecting 

distribution boards. 

LX busbar trunking systems up to 6300 A include transformer 

connection units with a side busbar connection (LX.....-AS.) and 

with a busbar connection from the top (LX.....-AS.-T.). 

a 

a: The total length depends on the distance between the phases 

of the connection units 

(approx. 3 x lug spacing + 300 mm) 

Connection unit LX.....-AS1 

selectable lug spacing 115 – 400 mm 



possible phase sequences for AS1 and AS3: 

L1, L2, L3, N (PEN) 

N (PEN), L3, L2, L1 

L3, L2, L1, N (PEN) 

N (PEN), L1, L2, L3 



possible phase sequences: 

L1, L2, N (PEN), L3 

L3, N (PEN), L2, L1 

L3, L2, N (PEN), L1 

L1, N (PEN), L2, L3

a 

a: The total length depends on the distance between the phases 

of the connection units 

(approx. 3 x lug spacing + 300 mm) 

Connection unit LX.....-AS1-T 




possible phase sequences for AS1 and AS3: 

L1, L2, L3, N (PEN) 

N (PEN), L3, L2, L1 

L3, L2, L1, N (PEN) 

N (PEN), L1, L2, L3 



possible phase sequences: 

L1, L2, N (PEN), L3 

L3, N (PEN), L2, L1 

L3, L2, N (PEN), L1 

L1, N (PEN), L2, L3 


Incoming cable connection 


The LXA(C)....-KE cable feeder unit is used when the busbar system 

has to be supplied via cables. 

The cable feeder unit is designed for rated currents from 800 to 

3200 A. 

Enclosure sizes 

Three system-dependent enclosure sizes are available: 

– Size 1: LXC01...-KE and LXC02...-KE 

– Size 2: LXC03...-KE to LXC(A)05...-KE 

– Size 3: LXC06...-KE and LXC07..- 

Maximum dimensions: 

920 mm x 639 mm x 490 mm (B x H x D). 

Both multi-core and single-core cables can be used. Cross-sections 

of up to 300 mm2 (bolt terminals) can be connected directly to the 

connection busbars of the cable connection unit. 

The standard version includes metal flange plates and cable 

grommets. An undrilled aluminum plate is ready-fitted for singlecore 

cables. 

Siemens LV 72.T · 2004 3/15 

3

3 



Tap-off units Plug-in tap-off units 

General 

For extensive power distribution, tap-off units in five sizes are available 

for 80 to 125 A, 160 to 250 A, 400 A, 630 A and 800 to 1250 

A. The rated operational voltage (Ue) is 400 V. The solid enclosure 

guarantees IP54 protection irrespective of the mounting position. 

They can be fitted with fuse switches or manually operated circuitbreakers, 

as well as bolts for the cable connection. For conductor 

systems (conductor configurations for type LX...6.) with an insulated 

PE conductor, tap-off units are provided with an additional separate 

PE connection. 

Cable entry 

Cable entry is possible from the side or from the end (exception: only 

from the end for tap-off units up to 125 A). Integrated flanges with 

cable grommets ensure secure entry for multi-core cable. Aluminium 

plates are used for single-core cable. These can be provided with 

cable glands at the required location. 

Safety during operation 

The tap-off units cannot be opened unless the protective device is 

switched off manually. Once this is done, the cable connection area 

is no longer energized. The part of the contact deviceinthefront of 

the tap-off unit is “finger-proof”. 

Implementing the tap-offs 

Tap-offs are required for different amperages depending on the size 

and type ofconsumers involved. These are implemented by means 

of plug-in tap-off units from 80 to 630 A or bolt-on tap-off units 

from 800 to 1250 A. 

3/16 


Tap-off units from 80 to 630 A 

– Can be fitted with either fuse switches or circuit-breakers 

– Tap-off via tap-off point 

– Orientation feature prevents incorrect fitting 

– Protection against direct contact to IP20 during fitting to tap-off 

point

Bolt-on tap-off units 


– Fitted with circuit-breaker 

– The tap-off unit can only be installed when the system is 

de-energized 

– Tap-off via joint block 

– Orientation feature prevents incorrect fitting 



Siemens LV 72.T · 2004 3/17 

3

3 



Tap-off units with fuse-switch up to 630 A 

IEC/BS type references 


125 125 

250 250 

400 400 

630 630 

NF type references 


100 100NF 

160 160NF 

3/18 


LX-AK/FS-... ...-. 

LX-AK6/FS-... ...-. 

LX-AK/FS....-. 

LX-AK6/FS....-. 

Rated currents 

Plug-in tap-off units in four sizes for 125 A, 250 A, 400 A and 630 

A are available. 

Short-circuit rating 

When using fuse cartridges in accordance with IEC and NF 

standards the conditional short-circuit rating Icf of the tap-off units 

is 100 kA (for BS standard: 80 kA). 

Fitting 

The fuse-switches are available for fuses in accordance with IEC, BS 

or NF standards and can be either for 3 or 4 poles. 

Cable connection 

Bolts are used to connect the cables with a special cable lug. The 

maximum connectable cross-section per phase for small sizes is 

95 mm2, and 2 x 120 mm2 to 2 x 240 mm2 for the three other 

sizes. 

Fuses in accordance with 

IEC IEC standard 

BS BS standard 

Circuit-breaker type 

3 3-pole 

4 4-pole 

Circuit-breaker type 

3 3-pole 

4 4-pole

Tap-off units with fuse-switch up to 1250 A 

Figure 1: Pluggable tap-off units from 125 A to 630 A 

Figure 2: Permanently installed tap-off units from 800 A to 

1250 A 



Rated currents 

Plug-in tap-off units in four sizes for 125 A, 250 A, 400 A and 630 A 

are available. The tap-off units for permanent installation have a 

standard size for 800 A, 1000 A and 1250 A. 


When using circuit-breakers with a high switching capacity, the 

conditional short-circuit rating Icc of the tap-off units is 65 kAfor the 

small size and for the three medium sizes and 85kAfor the large 

size. 

Fitting 

The circuit-breakers have a high switching capacity and are 

available as 3-pole or 4-pole versions. 

Cable connection 

Bolts are used to connect the cables with a special cable lug. The 

maximum connectable cross-section per phase for small sizes up to 

35 mm2 for the three medium sizes is 2 x 70 mm2 , 2 x 120 mm2 to 2 x 240 mm2 and up to 4 x 240 mm2 for the large size. 

Type reference key for circuit-breakers up to 1250 A 

Circuit-breaker 

3-pole 3 

4-pole 4 


80 80S 

100 100S 

125 125S 

160 160S 

200 200S 

250 250S 

400 400S 

630 630S 

800 800S 

1000 1000S 

1250 1250S 

LX-AK/LS-...-. 

LX-AK6/LS-...-. 

Siemens LV 72.T · 2004 3/19 

3

3 



Accessories 

End flange 

An end flange is fitted at the end of busbar run if it does not feed 

another distribution board. 

Joint block 

An additional joint block is required if a busbar run is located 

between two feeder units, such as distribution boards, transformers, 

generators or cable feeder units. 

Fixing brackets for horizontal installation 

Two different fixing brackets are available. 

– Type LX-BH for horizontal mounting, edgewise 

– Type LX..-BF for horizontal mounting, flat 

Two LX-K clamping brackets secure the busbar trunking system on 

the support sections of the fixing bracket. Clamping brackets and 

support section are supplied with the fixing bracket. 

Figure 3: LX...-BH 

3/20 


Figure 4: LX...-BF 

Fixing brackets for vertical installation 

Special spring brackets are required for installing vertical busbar 

runs. 

– Type LX.....-BV for power transmission 

– Type LX.....-BV-AK for power distribution 

Type LX.....-BV-AK allows for the additional inherent weight of at 

least one tap-off unit per floor with a floor height of 3.40 m to 

3.90 m. 

Figure 5: LX...-BV, LX...-BV-AK

LX trunking units 


Standards and regulations IEC/EN 60 439 Parts 1 and 2 

Climatic proofing Damp heat, constant, to IEC 60068-2-78 

Damp heat, cyclic, to IEC 60068-2-30 


min./max./24-hour average 

°C –5/+40/+35 

Degree of protection for trunking units IP54, 

IP55 with additional components except for power transmission 

Torque setting for joint block 

(for repeat usage) 

Nm 120 g10 

Busbar surface treatment Insulated over the entire length, aluminium and tin-on-nickel plated 

Trunking unit material Paint-finished aluminium housing 

Colour of trunking units RAL 7035 (light grey) 

Dimensions 

Rated insulation voltage Ui 

h chapter Dimension drawings 

trunking units 

V~ 690 

to DIN VDE 0110, IEC 909 

V– 800 

Overvoltage category/ 

pollution degree 

Rated operational voltage Ue 

III/3 to EN 60 947 

trunking units V~ 690 

Rated frequency Hz 50 

Technical Data 

Siemens LV 72.T · 2004 3/21 

3

3 



LXA..30 trunking units 

System-dependent data LXA 0130 0230 0430 0530 0630 0730 0830 0930 1030 

Rated current 

Conductor impedance 

Ie A 800 1000 1250 1600 2000 2500 3200 4000 4500 

At 50 Hz and +20 °C 

Resistance R'20 mO/m 0.117 0.084 0.056 0.036 0.027 0.023 0.018 0.014 0.011 

busbar temperature 

Reactance X'20 mO/m 0.028 0.031 0.024 0.017 0.009 0.011 0.009 0.005 0.012 

Impedance Z'20 mO/m 0.12 0.09 0.061 0.04 0.029 0.025 0.02 0.015 0.016 

At 50 Hz and with busbars at Resistance R' mO/m 0.146 0.106 0.07 0.043 0.034 0.028 0.022 0.017 0.014 

operational temperature 

Reactance X' mO/m 0.028 0.031 0.024 0.017 0.009 0.011 0.008 0.005 0.006 

Impedance Z' mO/m 0.149 0.11 0.074 0.046 0.029 0.025 0.024 0.018 0.015 

For 5-pole systems (PE) Resistance R'F mΩ/m 0.174 0.154 0.123 0.079 0.072 0.069 0.055 0.04 0.04 

in the event of a fault to 

EN 60 439-2 

Reactance X'F mO/m 0.084 0.085 0.069 0.056 0.04 0.044 0.04 0.025 0.028 

Impedance Z'F mO/m 0.193 0.175 0.141 0.096 0.082 0.081 0.068 0.047 0.048 

Zero impedance 

For 5-pole systems (PE) 

R'0 mO/m 0.297 0.274 0.251 0.228 0.204 0.181 0.158 0.135 0.111 

to DIN VDE 0102, 

IEC 909 

X'0 mO/m 0.216 0.2 0.184 0.168 0.152 0.136 0.119 0.103 0.088 

Z'0 mO/m 0.367 0.339 0.311 0.283 0.254 0.226 0.197 0.169 0.141 


Rated short-time withstand 

current for phase conductors r.m.s. value t =1s Icw kA 25 35 50 60 75 86 100 140 150 

Of the 5th conductor r.m.s. value t =1s Icw kA 15 21 30 36 45 51.6 60 60 70 

Rated peak withstand current Peak value Ipk kA 53 70 110 132 158 194 220 255 255 

Conductor material Aluminum 

Number of busbars 3 3 3 3 3 3 6 6 6 

Conductor cross-sec. L1, L2, L3 A mm2 Equivalent copper 

292 386 586 946 1192 1586 1892 2384 3172 

cross-section PE = Enclosure A mm2 948 948 1018 1135 1348 1348 2270 2694 2696 

Weights kg/m 9.6 10.6 13.3 17.8 21.8 26.3 35.5 43.4 52.1 

3/22 






Rated current 


Ie A 800 1000 1250 1600 2000 2500 3200 4000 4500 






At 50 Hz and with 

Resistance R' mO/m 0.146 0.106 0.070 0.043 0.034 0.028 0.022 0.017 0.014 

busbars at operational 

temperature 



For 4-pole systems 

Resistance R'F mO/m 0.158 0.126 0.093 0.063 0.048 0.043 0.036 0.025 0.022 


EN 60 439-2 





R'0 mO/m 0.227 0.190 0.145 0.102 0.081 0.073 0.063 0.041 0.036 


IEC 909 

X'0 mO/m 0.132 0.133 0.101 0.080 0.047 0.057 0.050 0.026 0.026 



Z'0 mO/m 0.263 0.232 0.177 0.129 0.094 0.093 0.080 0.049 0.044 

current r.m.s. value t =1s Icw kA 25 35 50 60 75 86 100 140 150 





292 386 586 946 1192 1586 1892 2384 3172 

cross-section PEN A mm2 1109 1161 1341 1657 2006 2223 3314 4011 4446 

Weights kg/m 10.6 12.0 15.2 20.8 25.6 31.3 42.0 51.3 63 

Siemens LV 72.T · 2004 3/23 

3

3 





Rated current 


Ie A 800 1000 1250 1600 2000 2500 3200 4000 4500 





temperature 



EN 60 439-2 

For 5-pole systems (N) 


EN 60 439-2 




IEC 909 



IEC 909 


3/24 














R'0 mO/m 0.281 0.274 0.240 0.159 0.153 0.154 0.121 0.092 0.095 

X'0 mO/m 0.198 0.200 0.161 0.130 0.094 0.101 0.097 0.063 0.069 

Z'0 mO/m 0.344 0.339 0.289 0.205 0.179 0.184 0.155 0.111 0.117 

R'0 mO/m 0.484 0.377 0.260 0.167 0.128 0.106 0.095 0.062 0.052 

X'0 mO/m 0.175 0.177 0.134 0.095 0.061 0.065 0.060 0.030 0.030 

Z'0 mO/m 0.515 0.417 0.293 0.192 0.142 0.125 0.112 0.069 0.060 


current for phase conductors r.m.s. value t =1s Icw kA 25 35 50 60 75 86 100 140 150 

For neutral conductor r.m.s. value t =1s Icw kA 15 21 30 36 45 51.6 60 70 70 





Conductor cross-sec. L1, L2, L3 A mm2 292 386 586 946 1192 1586 1892 2384 3172 

N A mm2 Equivalent copper 

292 386 586 946 1192 1586 1892 2384 3172 


Weights kg/m 10.6 12.0 15.2 20.8 25.6 31.3 42.0 51.3 63





Rated current 


Ie A 800 1000 1250 1600 2000 2500 3200 4000 4500 









temperature 



For 5-pole systems (PE) Resistance R'F mO/m 0.174 0.154 0.123 0.079 0.072 0.069 0.055 0.04 0.04 


EN 60 439-2 






EN 60 439-2 





R'0 mO/m 0.297 0.274 0.251 0.228 0.204 0.181 0.158 0.135 0.111 


IEC 909 

X'0 mO/m 0.216 0.2 0.184 0.168 0.152 0.136 0.119 0.103 0.088 

Z'0 mO/m 0.367 0.339 0.311 0.283 0.254 0.226 0.197 0.169 0.141 


R'0 mO/m 0.1 0.092 0.083 0.074 0.066 0.058 0.049 0.041 0.032 


IEC 909 

X'0 mO/m 0.195 0.177 0.159 0.141 0.123 0.105 0.087 0.068 0.05 



withstand current for 

Z'0 mO/m 0.219 0.199 0.179 0.159 0.139 0.119 0.099 0.079 0.059 

phase conductors r.m.s. value t =1s Icw kA 25 35 50 60 75 86 100 140 150 








584 772 1172 1892 2384 3172 3784 4768 6344 


Weights kg/m 11.6 13.3 17 23.8 29.3 36.3 48.5 59.2 73.2 

Siemens LV 72.T · 2004 3/25 

3

3 



L 



Rated current 


Ie A 800 1000 1250 1600 2000 2500 3200 4000 4500 









temperature 





EN 60 439-2 






EN 60 439-2 





R'0 mO/m 0.297 0.274 0.251 0.228 0.204 0.181 0.158 0.135 0.111 


IEC 909 

X'0 mO/m 0.216 0.2 0.184 0.168 0.152 0.136 0.119 0.103 0.088 

Z'0 mO/m 0.367 0.339 0.311 0.283 0.254 0.226 0.197 0.169 0.141 


R'0 mO/m 0.484 0.43 0.376 0.322 0.268 0.214 0.16 0.106 0.052 


IEC 909 

X'0 mO/m 0.195 0.177 0.159 0.141 0.123 0.105 0.087 0.068 0.05 




Z'0 mO/m 0.521 0.465 0.408 0.351 0.294 0.238 0.182 0.125 0.072 







Conductor cross-sec. L1, L2, L3, (PE) 1) A mm2292 386 586 946 1192 1586 1892 2384 3172 


292 386 586 946 1192 1586 1892 2384 3172 


Weights kg/m 11.6 13.3 17 23.8 29.3 36.3 48.5 59.2 73.2 

1) Insulated PE conductor 

3/26 






Rated current 


Ie A 800 1000 1250 1600 2000 2500 3200 4000 4500 









temperature 





EN 60 439-2 






EN 60 439-2 





R'0 mO/m 0.297 0.274 0.251 0.228 0.204 0.181 0.158 0.135 0.111 


IEC 909 

X'0 mO/m 0.216 0.2 0.184 0.168 0.152 0.136 0.119 0.103 0.088 

Z'0 mO/m 0.367 0.339 0.311 0.283 0.254 0.226 0.197 0.169 0.141 


R'0 mO/m 0.1 0.092 0.083 0.074 0.066 0.058 0.049 0.041 0.032 


IEC 909 

X'0 mO/m 0.195 0.177 0.159 0.141 0.123 0.105 0.087 0.068 0.05 




Z'0 mO/m 0.219 0.199 0.179 0.159 0.139 0.119 0.099 0.079 0.059 









584 772 1172 1892 2384 3172 3784 4768 6344 


Weights kg/m 12.6 14.7 18.9 26.8 33.1 41.3 55 67.2 83.7 


Siemens LV 72.T · 2004 3/27 

3

3 



LXC..30 trunking units 

System-dependent data LXC 0130 0230 0330 0430 0530 0630 0730 0830 0930 

Rated current 


Ie A 1000 1250 1400 1600 2000 2500 3200 4000 5000 









temperature 





EN 60 439-2 





R'0 mO/m 0.274 0.254 0.233 0.213 0.193 0.172 0.152 0.132 0.111 


IEC 909 

X'0 mO/m 0.207 0.191 0.175 0.16 0.144 0.128 0.113 0.097 0.082 

Z'0 mO/m 0.343 0.317 0.291 0.266 0.24 0.214 0.189 0.163 0.138 





Of the 5th conductor 

Rated peak withstand 

r.m.s. value t =1s Icw kA 23 30 34 36 45 51 60 70 70 

current Peak value Ipk kA 80 110 125 132 165 189 220 255 255 

Conductor material Copper 



292 386 442 586 712 1192 1586 1892 2384 


Weights kg/m 15.0 17.8 19.9 24.2 28.6 44.0 55.8 70.7 87.8 

3/28 






Rated current 


Ie A 1000 1250 1400 1600 2000 2500 3200 4000 5000 









temperature 






EN 60 439-2 





R'0 mO/m 0.172 0.147 0.121 0.114 0.089 0.064 0.054 0.047 0.032 


IEC 909 

X'0 mO/m 0.121 0.127 0.092 0.095 0.067 0.046 0.049 0.043 0.026 

Z'0 mO/m 0.210 0.194 0.152 0.148 0.111 0.079 0.073 0.064 0.042 



withstand current 

Rated peak 


withstand current Peak value Ipk kA 80 110 125 132 165 189 220 255 255 




292 386 442 586 712 1192 1586 1892 2384 

cross-section PEN A mm2 1240 1334 1460 1604 1847 2540 2934 4162 5080 

Weights kg/m 17.9 21.6 24.1 29.7 35.3 55.2 70.6 88.9 110.5 

Siemens LV 72.T · 2004 3/29 

3

3 





Rated current 


Ie A 1000 1250 1400 1600 2000 2500 3200 4000 5000 









temperature 





EN 60 439-2 






EN 60 439-2 





R'0 mO/m 0.252 0.245 0.203 0.213 0.181 0.156 0.152 0.108 0.089 


IEC 909 

X'0 mO/m 0.192 0.191 0.161 0.157 0.132 0.096 0.096 0.079 0.067 

Z'0 mO/m 0.317 0.310 0.259 0.264 0.224 0.183 0.180 0.134 0.111 


R'0 mO/m 0.293 0.244 0.204 0.173 0.129 0.082 0.074 0.061 0.043 


IEC 909 

X'0 mO/m 0.153 0.161 0.112 0.119 0.080 0.053 0.062 0.049 0.030 

Z'0 mO/m 0.330 0.292 0.233 0.210 0.152 0.098 0.096 0.078 0.053 





For neutral conductors r.m.s. value t =1s Icw kA 23 30 34 36 45 51 60 70 70 


Rated peak 







292 386 442 586 712 1192 1586 1892 2384 


Weights kg/m 17.9 21.6 24.1 29.7 35.3 55.2 70.6 88.9 110.5 

3/30 






Rated current 


Ie A 1000 1250 1400 1600 2000 2500 3200 4000 5000 









temperature 





EN 60 439-2 






EN 60 439-2 





R'0 mO/m 0.274 0.254 0.233 0.213 0.193 0.172 0.152 0.132 0.111 


IEC 909 

X'0 mO/m 0.207 0.191 0.175 0.16 0.144 0.128 0.113 0.097 0.082 

Z'0 mO/m 0.343 0.317 0.291 0.266 0.24 0.214 0.189 0.163 0.138 


R'0 mO/m 0.22 0.197 0.173 0.149 0.126 0.103 0.079 0.056 0.032 


IEC 909 

X'0 mO/m 0.177 0.162 0.146 0.131 0.115 0.1 0.084 0.069 0.053 

Z'0 mO/m 0.282 0.255 0.226 0.198 0.17 0.143 0.115 0.088 0.061 







Rated peak 







584 772 884 1172 1424 2384 3172 3784 4768 


Weights kg/m 20.7 25.3 28.2 35.2 41.9 66.3 85.5 107.2 133.2 

Siemens LV 72.T · 2004 3/31 

3

3 





Rated current 


Ie A 1000 1250 1400 1600 2000 2500 3200 4000 5000 









temperature 





EN 60 439-2 






EN 60 439-2 





R'0 mO/m 0.203 0.183 0.162 0.142 0.12 0.1 0.079 0.059 0.038 


IEC 909 

X'0 mO/m 0.187 0.171 0.155 0.139 0.122 0.106 0.09 0.074 0.058 

Z'0 mO/m 0.276 0.25 0.224 0.198 0.171 0.145 0.119 0.094 0.069 


R'0 mO/m 0.293 0.262 0.23 0.199 0.168 0.137 0.105 0.074 0.043 


IEC 909 

X'0 mO/m 0.177 0.162 0.146 0.131 0.115 0.1 0.084 0.069 0.053 

Z'0 mO/m 0.342 0.308 0.272 0.238 0.203 0.169 0.134 0.101 0.068 






Of the 5th conductor r.m.s. value t =1s Icw kA 23 30 34 36 45 51 60 70 70 






292 386 442 586 712 1192 1586 1892 2384 


+ busbar 292 386 442 586 712 1192 1586 1892 2384 

Weights kg/m 20.7 25.3 28.2 35.2 41.9 66.3 85.5 107.2 133.2 

3/32 






Rated current 


Ie A 1000 1250 1400 1600 2000 2500 3200 4000 5000 









temperature 





EN 60 439-2 






EN 60 439-2 





R'0 mO/m 0.203 0.183 0.162 0.142 0.12 0.1 0.079 0.059 0.038 


IEC 909 

X'0 mO/m 0.187 0.171 0.155 0.139 0.122 0.106 0.09 0.074 0.058 

Z'0 mO/m 0.276 0.25 0.224 0.198 0.171 0.145 0.119 0.094 0.069 


R'0 mO/m 0.22 0.197 0.173 0.149 0.126 0.103 0.079 0.056 0.032 


IEC 909 

X'0 mO/m 0.177 0.162 0.146 0.131 0.115 0.1 0.084 0.069 0.053 

Z'0 mO/m 0.282 0.255 0.226 0.198 0.17 0.143 0.115 0.088 0.061 












584 772 884 1172 1424 2384 3172 3784 4768 


+ busbar 292 386 442 586 712 1192 1586 1872 2384 

Weights kg/m 23.5 29 32.4 40.8 48.6 77.5 100.4 125.4 155.9 

Siemens LV 72.T · 2004 3/33 

3

3 





Rated current 


Ie A 1000 1250 1400 1600 2000 2500 3200 4000 5000 









temperature 





EN 60 439-2 






EN 60 439-2 





R'0 mO/m 0.274 0.254 0.233 0.213 0.193 0.172 0.152 0.132 0.111 


IEC 909 

X'0 mO/m 0.207 0.191 0.175 0.16 0.144 0.128 0.113 0.097 0.082 

Z'0 mΩ/m 0.343 0.317 0.291 0.266 0.24 0.214 0.189 0.163 0.138 


R'0 mO/m 0.293 0.262 0.23 0.199 0.168 0.137 0.105 0.074 0.043 


IEC 909 

X'0 mO/m 0.177 0.162 0.146 0.131 0.115 0.1 0.084 0.069 0.053 

Z'0 mO/m 0.342 0.308 0.272 0.238 0.203 0.169 0.134 0.101 0.068 












292 386 442 586 712 1192 1586 1892 2384 


Weights kg/m 20.7 25.3 28.2 35.2 41.9 66.3 85.5 107.2 133.2 


3/34 






Rated current 


Ie A 1000 1250 1400 1600 2000 2500 3200 4000 5000 









temperature 





EN 60 439-2 






EN 60 439-2 





R'0 mO/m 0.274 0.254 0.233 0.213 0.193 0.172 0.152 0.132 0.111 


IEC 909 

X'0 mO/m 0.207 0.191 0.175 0.16 0.144 0.128 0.113 0.097 0.082 

Z'0 mO/m 0.343 0.317 0.291 0.266 0.24 0.214 0.189 0.163 0.138 


R'0 mO/m 0.22 0.197 0.173 0.149 0.126 0.103 0.079 0.056 0.032 


IEC 909 

X'0 mO/m 0.177 0.162 0.146 0.131 0.115 0.1 0.084 0.069 0.053 

Z'0 mO/m 0.282 0.255 0.226 0.198 0.17 0.143 0.115 0.088 0.061 












584 772 884 1172 1424 2384 3172 3784 4768 


Weights kg/m 23.5 29 32.4 40.8 48.6 77.5 100.4 125.4 155.9 


Siemens LV 72.T · 2004 3/35 

3

3 



Trunking units 

Fire load for trunking units with/without tap-off points 

System Fire load 

[kWh/m] 









LXA0541 














Trunking units with tap-off points must be allowed a fire load of 

2.9 kWh per tap-off point irrespective of system size. 

Fire load values for LX...30, LX...52, LX...53, LX...54, LX...61, LX...62 

only on request. 

3/36 

1.95 

2.04 

2.42 

2.53 

3.54 

3.48 

5.33 

5.42 

7.28 

10.88 

11.07 


Fixing distances [m] for common mechanical loads with a 

horizontal installation 

System Busbar position 

Edgewise Flat 

LXA(C)01.. 2 2 


LXC03.. 2 2 







LXA10.. 3 2

Connection units for non-Siemens distribution boards 



The required terminal capacity for bare copper connections to connect non-Siemens distribution boards can be found in the Technical Data. 

System Ie Number ... Cu bar 

width x thickness 

[A] 1 2 3 4 

Connectable LXA/LXC system 

LXC01.. 1000 (800) 1) 60 x 10 30 x 10 20 x 10 – LXA01.. and LXC01.. 


LXC03.. 1400 100 x 10 50 x 10 30 x 10 – LXC03.. 


LXA05.. 1600 100 x 10 60 x 10 30 x 10 – LXA05.. 

LXC05.. 2000 160 x 10 80 x 10 50 x 10 – LXC05.. 

LXC06.. 2500 (2000) 1) 200 x 10 100 x 10 60 x 10 50 x 10 LXC06.. and LXA06.. 

LXC07 3200 (2500) 1) – 160 x 10 100 x 10 80 x 10 LXC07.. and LXA07.. 

LXC08.. 4000 (3200) 1) – 200 x 10 120 x 10 100 x 10 2) LXC08.. and LXA08.. 

LXC09.. 5000 (4000) 1) – – 200 x 10 160 x 10 LXC09.. and LXA09.. 

LXA10. 4500 – – 160 x 10 120 x 10 LXA10. 

1) When connecting LXA systems 

2) According to DIN 43 671 Table 1 the maximum uninterrupted current for this Cu cross-section is 3980 A 

Tap-off units 

General Technical Data 

Standards and regulations IEC/EN 60 439 Part 1 and 2, DIN VDE 0660 Part 500 and 502 

Climatic proofing Damp heat, constant, as per IEC 60068-2-78 

Damp heat, cyclic, as per IEC 60068-2-30 


min./max. 24-hour average 

°C –5/40/35 

Protection type IP54 

Colour, tap-off units RAL 7035, light grey 

Dimensions h chapter Dimension drawings 

Material, tap-off units Steel with paint finish 

Rated insulation voltage V~ 690 

V- 800 

Overvoltage category/pollution degree III/3, to EN 60 497-1 

Rated frequency Hz 50 

Rated operational voltage V 400 

Siemens LV 72.T · 2004 3/37 

3

3 



Tap-off units with circuit-breakers 

Rated current Ie A 80 160 400 630 800 1) 

3/38 


A 125 200 – – 1000 1) 

A – 250 – – 1250 1) 

Rated conditional short-circuit current Icc 

Connectable cross-sections (CU) 

kA 65 65 65 65 85 

L1, L2, L3 mm2 1 x 16 –35 1 x 50 – 150 

2 x 25 – 70 

N, PE, ISO-PE mm2 1 x 16 –35 1 x 50 – 150 

2 x 25 – 70 

1 x 70 – 240 

2 x 70 – 120 

1 x 70 – 240 

2 x 70 – 120 

1 x 70 – 240 

2 x 70 – 240 

1 x 70 – 240 

2 x 70 – 120 

Bolt terminal 

Cable entry 

M8 M8 M12 M12 M12 

at end yes yes yes no no 

from side 

Multi-core cable 

no yes yes yes yes 

1 x 70 – 240 

4 x 70 – 240 

1 x 70 – 240 

4 x 70 – 120 

Cable grommets 1 x KT42 2 x KT4 2 x KT4 2 x KT4 4 x KT4 

Cable diameter (mm) 18 –47 14 – 68 14 – 68 14 – 68 14 – 68 

Single-core cable 3), ALU plate, without apertures – 12 x M40 12 x M40 12 x M40 24 x M40 

Tap-off units with fuse switch-disconnectors 

Rated current A 100 160 400 630 – 

A 125 250 – – – 

A – – – – – 

Rated conditional short-circuit current Icf kA 100 (80) 2) 100 (80) 2) 100 (80) 2) Connectable cross-sections (CU) 

– 

L1, L2, L3 mm2 1 x 35 – 95 1 x 50 – 240 

2 x 50 – 120 

N, PE, ISO-PE mm2 1 x 16 –35 1 x 50 – 240 

2 x 50 – 120 

1 x 95 – 240 

2 x 95 – 120 

1 x 95 – 240 

2 x 95 – 120 

1 x 95 – 240 

2 x 95 – 120 

1 x 95 – 240 

2 x 95 – 120 

Bolt terminal 

Cable entry 

M8 M8 M10 M10 – 

at end yes yes yes yes – 

from side 

Multi-core cable 

no yes yes yes – 

Cable grommets 1 x KT42 2 x KT4 2 x KT4 2 x KT4 – 

Cable diameter (mm) 18 –47 14 – 68 14 – 68 14 – 68 – 

Single-core cable 3), ALU plate, without apertures – 12 x M40 12 x M40 12 x M40 – 

1) The rated current depends on the mounting position of the circuit-breaker. 

If the tap-off unit is suspended (power tap-off below) a rated current reduction to 0.9 x Ie must be allowed for 

2) Only applicable to fuses according to BS 

3) Cable entry requires the use ofcable glands with strain relieve (not in the scope of delivery). 

– 

–

Trunking unit 

Single systems, LXA(C)01 to 07 

230 

Double systems, LXA(C)08 to 10 

System l a 

LXA(C)01 350 – 3000 137 


LXC03 350 – 3000 162 







LXA10 350 – 3000 599 

l 

l 


145 

145 

Dimension drawings 

a 

a 

Siemens LV 72.T · 2004 3/39 

3

3 



Tap-off units 


163 

with circuit-breaker with fuse switch-disconnector 


with circuit-breaker with fuse switch-disconnector 

3/40 

177.5 

650 

436 

305.5 

15 


434 

530 

max. 138¡ 

163 496 

321.5 

90¡ 

545 

max 126¡ 

90¡ 

306 

710 

750 15 

765 

320 30 

886 

193.5 

311.5 

15 

327.5 

530 

545 

306 

750 15 

765 

320 30

Tap-off units, 400 A 

163 562.5 

with circuit-breaker 

with fuse switch-disconnector 

325.5 

328.5 

90¡ 

max. 127¡ 

790 

855 15 

870 

855 15 

870 

990 

418 30 

418 30 


194 


Siemens LV 72.T · 2004 3/41 

3

3 



Tap-off units, 630 A 

with circuit-breaker 

with fuse switch-disconnector 

Tap-off units with circuit-breaker from 800 up to 1250 A 

3/42 

321 

64.5 

329 

75.05 

47 

329 

75.05 

36 

36 


910 

910 

533 

86 

533 

86 

385.5 

62 

424 

106

Fixing accessories 

Fixing bracket 1) 

for horizontal busbar runs 

14 

Clamp bracket 

For fastening on beam/trays 

10 

a 

42.5 b 42.5 

14 

55 

= 

60 10 

2.5 

12 

1) LX-K clamping brackets are supplied with the fixing bracket 

40 

= 

50 

14 

14 

= 

= 

80 

50 

3 


Type a b 

LX-BH(F) 285 172 

LX01..-BH(F) 285 172 

LX02..-BH(F) 285 172 

LX03..-BH(F) 307 194 

LX04..-BH(F) 307 194 

LX05..-BH(F) 362 239 

LX06..-BH(F) 432 319 

LX07..-BH(F) 432 319 

LX08..-BH(F) 584 471 

LX09..-BH(F) 744 631 

LX10..-BH(F) 744 631 


Siemens LV 72.T · 2004 3/43 

3

3 



Fixing accessories 

Fixing bracket 

for vertical busbar runs 

3/44 

42 

42 

156 

240 

o 13.5 

42 

156 42 

o 13.5 

18 

300 

18 

20 

100 100 

57 101 


336 

220 

158 

220 101 

■

Further 

Information 

4/2 Dimensioning and selection 

4/7 Planning example 

4/9 Functional endurance 

4/10 Busbar trunking systems with 

fire barriers 

4/12 Aids for planning trunking layout 

4/16 Magnetic fields 

4/17 Sprinkler test 

4/19 Engineering Tools 


4 


Dimensioning and selection 

Calculating the rated current 

The following information is important for planning busbar trunking 

for transporting and distributing power: 

– Location, number and connected loads of the consumers or subdistribution 

systems 

– Rated diversity factor 

– Information on the short-circuit level to be expected 

– Information on distribution board to be supplied: 

Distribution board type 

Supply (top, bottom, rear) 

Type and structure ofcopper busbars 

– Physical nature of the placeof installation and erection: 

Spatial dimensions 

Building structure (for suspension and fixing) 

Transportation paths 

Ambient conditions (temperature, humidity, dirt, etc.) 

Wall cut-outs 

– Coordination with other system sections – for example, required 

coordination with the busbar trunking system installation plan: 

With planned power lines 

With the planned locations of the ventilation duct runs 

With lighting plans 

– Required number and location of the tap-off points. 

The busbar trunking system is dimensioned taking into account the 

restrictions mentioned above. The first step is to determine the rated 

current. 

Pinst ⋅α⋅b IB = ---------------------------------- 10 

3⋅ Ue⋅ cosϕ 

IB = rated current (A) 

Ue = rated operational voltage (V) 

cos v = power factor 

Pinst = installed power (kW) 

a = diversity factor 

b = feeder factor 

b = 1 with single-ended feed 

b = 0.5 with double-ended feed and centre feeder unit 

3 

⋅ 

4/2 


Number of main circuits a 

2 and 3 0.9 

4 and 5 0.8 

6 to 9 0.7 

10 and more 0.6 

Frequently the diversity factor as per IEC/EN 60 439-1 (see Table) 

can be used for a unless this is ruled out by a particular application. 

Dependence of load-carrying capacity on the ambient 

temperature 

The rated current Ie is based on an ambient temperature of 35 °C 

averaged over 24 hours and not exceeding 40 °C. The following 

diagram shows deviations of the current-carrying capacity as a 

function of the ambient temperature: 

Rated current le [%] 

120 

115 

110 

105 

100 

95 

90 

85 

80 

75 

70 

-5 0 5 10 15 20 25 30 35 40 45 50 55 60 

Ambient temperature, average over 24 hours [°C] 

65 

LX

Calculating the voltage drop 

With long runs you may need to calculate the voltage drop: 

DU =a 3 IB l (R' cos v + X' sin v) 10-3 DU = voltage drop (V) 

IB = rated current (A) 

l = total length of the system (m) 

a = load distribution factor 

R' = resistive load (mO/m) 

X' = inductive load (mO/m) 


Load distribution factor a depends on the type of load distribution. 

The following table applies when 1 x the rated system current in 

each case is fed in at the feeder points. 

Load distribution Factor a 

A 

A 

A 

B 

B C D E 

B A C 

B D A E C 

C D E F 

l 

1) with evenly distributed load 

B 

Supply at A 

Tap-off at B 

Supply at A 

Tap-off at B, C, D, E 

Supply at A 

Tap-off at B, C 

Supply at A 

Tap-off at B, C, D, E 

Supply at A, B 

Tap-off at C, D, 

E, F 

1 

0.5 1) 

0.25 

0.125 1) 

0.25 1) 

Voltage drop graphs for LXA/LXC 



The following graphs show the voltage drop with the LXA/LXC 

system 

– Taking into account the thermal resistances (in accordance with 

IEC/EN 60 439-2 when IB > 630 A) 

– With a load distribution factor of a=1 

– When loaded with the rated current. In the case of adifferent 

load distribution factor the value of the curve must be multiplied 

by the corresponding distribution factor. 

For systems with unevenly distributed loads we recommend using 

Netplan, short-circuit and load-flow calculation program. 

DU 0.22 

[V/m] 

0.20 

0.18 

0.16 

0.14 

0.12 

0.10 

0.08 

0.06 

0.4 0.5 0.6 0.7 

Figure 1: Voltage drop for LXA.. systems 

0.8 0.9 1.0 

cos v 






Siemens LV 72.T · 2004 4/3 

4

4 



Figure 2: Voltage drop for LXA.. systems 

Figure 3: Voltage drop for LXC.. systems 

4/4 

DU 

[V/m] 

DU 

[V/m] 

0.20 

0.18 

0.16 

0.14 

0.12 

0.10 

0.08 

0.06 

0.4 0.5 0.6 0.7 

0.20 

0.18 

0.16 

0.14 

0.12 

0.10 

0.08 

0.06 

0.4 0.5 0.6 0.7 


LXA08 LXA05 


0.8 0.9 1.0 

cos v 

0.8 0.9 1.0 

cos v 







DU 

[V/m] 

0.20 

0.18 

0.16 

0.14 

0.12 

0.10 

0.08 

0.06 

0.4 0.5 0.6 0.7 

Figure 4: Voltage drop for LXC.. systems 

0.8 0.9 1.0 

cos v 




LXC07

Overload and short-circuit protection 

Busbar trunking systems must be protected against short-circuits 

and overloads. Fuses and circuit-breakers are used as protective 

devices. When selecting these protective devices, the strength of the 

expected short-circuit currents, selectivity requirements, operating 

and signalling functions may also be factors in your decision. 

Fuses are in general less suitable as overload protection on account 

of their relatively high response characteristics (1.3 to 1.6 times the 

rated current) and their long melting time with small over-currents. 

To ensure adequate protection of the busbar trunking system 

against overloads using a fuse, its rated current must be a step 

lower than the rated current of the busbar trunking system whichis 

to be protected. This means that the busbar trunking system may 

not necessarily be used optimally. 

Ifcircuit-breakers are used, the thermally delayed overload release 

must be set to the value of the rated current of the busbar trunking 

system. This means that the busbar trunking system can be loaded 

100 %. 



When you decide on your short-circuit protection via fuses and 

circuit-breakers you must not exceed the specified short-circuit 

ratings of the busbar trunking systems. It will depend on the 

strength of the short-circuit current expected whether a current-limiting 

protective device is required and what short-circuit breaking 

capacity the protective device should have. 

A tabular overview is provided below of the circuit-breakers which 

can provide short-circuit and overload protection (400 V and 50 Hz) 

for the corresponding trunking system. 

The following applies: 

I"k F Icc F Icu 

System Ie Circuit-breakers with high switching capacity for 400 V/50 Hz 

I"k = the short-circuit current expected at the place 

of installation 

Icc = conditional rated short-circuit current 

of the busbar run 

Icu = rated short-circuit breaking capacity 

of the circuit-breaker 

Normal Icu Icc Medium Icu Icc High Icu Icc 

A kA kA kA kA kA kA 

LXA01 800 – – – NZM14-800S 85 25 (37) 1) – – – 



LXA05 1600 – – – IZMN1-A1600 50 50 NZM14-1600H 100 60 (93) 1) 

LXA06 2000 IZMB2-A2000 55 55 IZMN2-A2000 75 75 – – – 

LXA07 2500 IZMB2-A2500 55 55 IZMN2-A2500 75 75 – – – 

LXA08 3200 – – – IZMN2-A3200 75 75 – – – 

LXA09 4000 – – – IZMH3-A4000 75 75 – – – 

LXA10 4500 – – – IZMH3-A5000 100 100 – – – 

LXC01 1000 – – – NZM14-1000S 85 38 (56) 1) – – – 

LXC02 1250 – – – NZM14-1250S 85 50 (74) 1) – – – 

LXC03 1400 – – – IZMN1-A1600 50 50 NZM14-1600H 100 57 (88) 1) 

LXC04 1600 – – – IZMN1-A1600 50 50 NZM14-1600H 100 60 (93) 1) 

LXC05 2000 IZMB2-A2000 55 55 IZMN2-A2000 75 75 – – – 

LXC06 2500 IZMB2-A2500 55 55 IZMN2-A2500 75 75 – – – 

LXC07 3200 – – – IZMN2-A3200 75 75 – – – 

LXC08 4000 – – – IZMH3-A4000 75 75 – – – 

LXC09 5000 – – – IZMH3-A5000 100 100 – – – 

A switch according to the IZM-types is available within the 3WL Siemens Product range (information on request). 

1) The values in brackets apply when current-limiting circuit-breakers are used instead of NZM14-... 

Siemens LV 72.T · 2004 4/5 

4

4 



Safe disconnection of the smallest 1-pole earth-fault 

current 

The loop impedance determines the size of the 1-pole short-circuit 

current. The loop impedance is calculated between the 

– phase conductor and protective conductor 

– phase conductor and PEN conductor 

This value may be determined by 

– Measuring with measuring instruments 

– Calculation 

– Simulating the network in the network model. 

The Technical Data includes a listing of the impedance values of the 

LX busbar trunking system so that you can calculate the loop impedances 

of a busbar system which forms part of the total loop impedance. 

With the aid of the loop impedanceofthe entire busbar trunking 

system it is easy to calculate the smallest 1-pole short-circuit current 

which can be expected. 

c⋅Un Ikl min = ----------------- 

3 ⋅ Zk c = Voltage factor 0.95 

Un = Voltage between phase conductors 

Zk = short-circuit impedance 

Determining the loop impedanceofall of the contributing apparatus 

in a system (mains feeder, transformers, distribution boards, cable 

runs etc.) is a time-consuming matter. The effort involved in planning 

can be considerably reduced here if you use a network calculation 

program such as NetPlan, which covers in one database all of 

the data you need for commonly used electrical equipment. 

4/6 


a Power distribution board 

b Busbar trunking system 

c Tap-off point 

1 2 

3 


Planning example 

Siemens LV 72.T · 2004 4/7 

4

4 


Planning example 

Power supply to a high-rise 

Number of storeys 10 (each with 8 apartments) 

Ratings per apartment 26 kW 

Rated operational voltage Ue 400 V 

Power factor cos v 0.9 

Diversity factor a 0.6 

Utilization factor b 0.5 

Supply transformers 1 x 1250 kVA, uk = 6 % 

Protection type IP30/IP54 

System type TN-S 

Calculating the rated current per storey 

IBS 

Pinst ⋅ α 

= ---------------------------------- 10 

3⋅ Ue⋅ cosϕ 

IBS = rated current per storey (A) 

Ue = rated operational voltage (V) 


Pinst = installed power (kW) 

a = diversity factor 

IBS = 

3 

⋅ 

------------------------------- 

8⋅ 26⋅ 0.6 

10 

3 ⋅ 400 ⋅0.9 

3 

⋅ = 200 A 

4/8 


Calculating the rated current of the busbar run 

IB =(INS · b) 

IB= 10 · 200 · 0.5 = 1000 A 

The reduction factor is the utilization and rated diversity factor for the 

total number of loads. If no precise figures are known, good typical 

values can be obtained from the local power companies. They do 

however vary regionally. The table shows average values: 

Type ofconsumer b 

Apartments with electric stoves and 

hot-water boilers 

0.1 – 0.2 

Night-storage heaters 0.8 –1 

Lighting in office blocks and in buildings used 

commercially 

0.7 – 0.9 

Elevators and general services 0.6 – 0.8 

Conference rooms 0.6 – 0.8 

Small offices 0.5 – 0.7 

Large offices 0.4 – 0.8 

The collated results lead to the selection of an LXA busbar system, 

5-conductor with full N conductor cross-section, a current carrying 

capacity of 1250 A and a short-circuit rating of Icw (t = 1 s) 50 kA. 

Busbar system: LXA0451 

Tap-off units with 250 A fuse switch-disconnectors (prepared for 

use of low-voltage h.b.c. (NH1) fuse cartridges) are used for supplying 

the storey distribution boards. 

• Tap-off unit: LX-AK/FS250IEC-3

General 

Fire protection equipment and fire protection precautions for electrical 

installations are required especially with building structures of 

a particular type or utilization. Buildings of this kind include hospitals 

and office buildings. VDE 0108 specifies in this case that the 

electrical systems must remain serviceable for certain periods of 

time even in the event of a fire. 

This applies in particular to 

– Fire alarm systems 

– Systems for sounding alarms and conveying instructions to visitors 

and employees 

– Emergency lighting 

– Passenger elevators with evacuation circuit which must remain 

serviceable in the incoming feeder area for at least 30 minutes 

under post-flashover fire conditions 

– Water-pressure boosting equipment for fire-fighting water supply 

o C 

1000 

ϑ − ϑο 

Figure 5: Standard temperature curve (ETK) for assessing functional endurance 

500 

0 


Functional endurance 

– Ventilation units of enclosed staircases, elevator shafts and drive 

equipment rooms offire service elevators for which a minimum 

serviceability of 90 minutes must be ensured. 

In order to be able to provide the functional endurance required by 

the regulations, Siemens in collaboration with Promat are currently 

carrying out testing of the LXA/LXC busbar systems at the Materials 

Testing Institute in Brunswick/Germany. During the fire testing the 

busbar trunking systems in question, which had been fitted with 

cladding consisting of Promatect L500 plates of various thicknesses, 

were subjected to a fire load of external origin as per the ‘standard 

temperature curve (ETK)‘ in order to assess functional enduranceas 

per DIN 4102 Part 12 (01/91). 

Siemens specialists are available at any time to provide more 

detailed information on the LX busbar trunking system with the 

functional endurance. 

30 60 90 120 150 180 

(min) 

Siemens LV 72.T · 2004 4/9 

4

4 


Busbar trunking systems with fire barriers 

General comments 

German state building codes prescribe that buildings must be designed 

in such a way that “fire and smoke are prevented from starting 

and spreading and that if there is a fire, effective fire-fighting and 

the saving of human and animal life is possible”. Accordingly, no 

fire or smoke fumes are permitted to travel from one storey or fire 

section to another. 

All LXA/LXC busbar systems can be fitted with a fire barrier and will 

thereby satisfy the requirements applicable to buildings, including 

high-rises. 

Unlike cable installations, LX busbar systems come ready-fitted with 

a fire barrier. Retrofitting is also possible so that adaptions can be 

made to the requirements on site. A general supervisory authority 

approval by the Deutsche Institut für Bautechnik in Berlin (DiBt: 

German Institute for Construction Engineering) has been obtained. 

The fire barrier meets the requirements of EN 60 439-2 (draft) and 

offire resistance class S120 to DIN 4102 Part 9. The picture 

illustrates the requirements met by the LX busbar trunking system. 

4/10 


d 

c 

imax. =986° 

a Permitted temperature increase at components: max. 180 °C 

b Scene offire: Application offire in accordance with standard temperature 

curve DIN 4102, Sheet 2 

c Permitted temperature increase of escaping air: max. 140 °C 

d No flammable gases are permitted to escape. 

No fumes which would hinder rescue work are permitted to escape. 

a 

b

Cut-outs 

Recommended dimensions ofceiling or wall cut-outs: 

a 

a 

a 

a 

1) The space between the busbar trunking wall and wall cut-out must 

be filled with mortar or fireproof material. This must comply with 

the applicable regulations for conformity to fire resistance class 

S90/S120. 

100 

b 

b 


Busbar trunking systems with fire barriers 

Dimensions of ceiling or wall cut-out: 

a b 

cm cm 

LX.1 43 42 

LX.2 43 42 

LX.3 43 45 

LX.4 43 45 

LX.5 43 49 

LX.6 43 57 

LX.7 43 57 

LX.8 43 72 

LX.9 43 88 

LX.10 43 88 

Siemens LV 72.T · 2004 4/11 

4

4 


Aids for planning trunking layout 

Space requirements with horizontal installation 

To ensure straightforward and uncomplicated installation of the 

trunking units and tap-off units your design work should take into 

consideration the recommended minimum distances from building 

components. 

LX busbar trunking without tap-off units 

Minimum dimensions for busbar trunking systems without tap-off 

units: 

LX busbar trunking with tap-off units 

Minimum dimensions for busbar trunking systems with tap-off 

units: 

System Dimension 

a 

4/12 


a 

c 

Dimension 

b 

Dimension 

c 

cm cm cm cm 

Dimension 

d 

LX.01.. 10 24 38 123 

LX.02.. 10 24 38 123 

LXC03.. 10 27 38 126 

LX.04.. 10 27 38 126 

LX.05.. 10 31 38 130 

LX.06.. 10 39 38 138 

LX.07.. 10 39 38 138 

LX.08.. 10 54 38 153 

LX.09.. 10 70 38 169 

LXA10.. 10 70 38 169 

b 

d 

Space requirements with vertical installation 

LX busbar trunking without tap-off units 

Minimum dimensions for busbar trunking systems without tap-off 

units. The dimensions of system fixing brackets not shown in the 

diagram have been taken into account. 

LX busbar trunking with tap-off units 

Minimum dimensions for busbar trunking systems with tap-off 

units. The dimensions of system fixing brackets not shown in the 

diagram have been taken into account. 

System Dimension 

a 1) 

Dimension 

b 

Dimension 

c 

Dimension 

d 

cm cm cm cm cm 

LX.01.. 10 27 15 133 38 

LX.02.. 10 27 15 133 38 

LXC03.. 10 30 15 136 38 

LX.04.. 10 30 15 136 38 

LX.05.. 10 34 15 140 38 

LX.06.. 10 42 15 148 38 

LX.07.. 10 42 15 148 38 

LX.08.. 10 57 15 163 38 

LX.09.. 10 73 15 179 38 

LXA10.. 10 73 15 179 38 

1) Distance from wall depends on the fixing bracket 

c 

e 

a 

a 

b 

d 

Dimension 

e

Vertical routing of busbar run 

a 

b 

c 

d 

e 

f 

g 

Mounting position 



The mode of installation is prescribed for tap-off units with vertical 

busbar runs. The tap-off cable must be connected from below. This 

will be the case when the L1 conductor is on the left-hand side (as 

seen from the front). 

Vertical fixing 

Special spring brackets are required for installing vertical LX busbar 

runs. Per storey at least one bracket should be used for single 

systems and two bracket for double systems. The spring bracket is 

designed to carry and secure the inherent weight and the linear 

extension of the busbar trunking systems load. Two versions with 

different dimensions and spring force are available for this. In order 

to allow for the additional weight of tap-off units, type selection 

should distinguish between power transmission and power distribution. 

At a floor height of h = 3.40 m to 3.90 m the spring bracket should 

have the following dimensions: 

Power transmission 

Power 

distribution 1) 

Size Quantity Type 

LX.01 to LX.07 

Single system 


Double system 


Single systems 


Double system 

1) Per floor at least one tap-off unit 

1 LX.....-BV 

2 LX.....-BV 

1 LX.....-BV-AK 

2 LX.....-BV-AK 

a End flange, termination 

b Tap-off units location 

c Spring bracket 

d Fire barrier 

e Ceiling thickness 

f Wall clearanceof 10 cm is required due to the spring bracket. Uneven 

surfaces in the fixing wall must be compensated for by means of 

mounting material provided on site 

g Distribution board 

Siemens LV 72.T · 2004 4/13 

4

4 



Examples of fixing from ceilings 

For single systems: 

– M12 threaded rods (DIN 975-A3 B) with hexagonal nuts, 

washers and connection sleeves 

– LX-BH fixing bracket for system, edgewise 

– LX..-BF fixing bracket for system, flat 

Figure 1: Single system, edgewise 

Figure 2: Single system, flat 

4/14 


For double systems: 

– U-shaped support consisting of U struts 

– Upper cross beam consisting of U profile 

– clamping bracket LX-K 

Figure 3: Double system, edgewise 

Figure 4: Double system, flat

Examples of wall fixing 

For single and double systems 

– Wall beam 


Figure 5: Double system, edgewise 

Figure 6: Single system, flat 

Examples of fixing between floors 

For single and double systems 

– Tube beam 


Figure 7: Double system, flat 

Figure 8: Single system, edgewise 



Siemens LV 72.T · 2004 4/15 

4

4 


Magnetic fields 

General 

Due to their nature, the busbars used for power distribution and 

carrying energy generate alternating electromagneticfields with a 

basicfrequencyof 50 Hz. These magneticfields can have a negative 

effect on the fault-free functioning of sensitive equipment suchas 

computers or measuring devices. 

Limit values 

The EMC Directives and the standards derived from these do not 

contain any regulations or recommendations for engineering busbar 

trunking system installations. If the busbar trunking system is to be 

used in hospitals, you can refer to VDE 0107. 

VDE 0107 defines limit values for line-frequency magneticfields in 

hospitals. According to this standard the magnetic induction at 

50 Hz must not exceed the following values in locations where 

patients are found: 

B=2x 10-7 tesla for ECG 

B=4x 10-7 tesla for ECG 

The threshold value for inductive interference between multi-core 

cables and conductors of the electrical power installation, conductor 

cross-section > 185mm2and the patient locations to be protected 

will certainly not be exceeded provided the minimum separating 

distance of 9 m recommended in VDE 0107 is complied with. 

When busbars are used this distance will usually turn out to be less 

since the metal enclosure is effective in reducing magnetic 

interference fields in the environment. 

4/16 

m Tesla (pp) 

1000 

100 

10 


1 

0.1 

0.1 

800 A 

Magnet field measurements 

In order to nevertheless assess during the planning phase the 

busbars to be used, Siemens has carried out extensive magnetic 

field measurements in accordance with EN 60 439-2. The magnetic 

interference from the busbar systems was measured using a straight 

section of busbar trunking 9.0 m in length. The busbars were loaded 

symmetrically with the rated current and the magneticfields measured 

in eight directions at 0.1 m intervals up to a distanceof 1m. 

3 

1 

2 8 

4 6 

5 

Figure 9: System ofcoordinates for magneticfield measurement 

The diagram shows the magnetic interference fields of LX systems 

of800 A, 1600 A and 2000 A. The minimum distance between the 

busbar and the susceptible device is shown in meters. This makes it 

possible to comply with the limit values for magnetic interferencein 

rooms used for medical purposes. 

Further measured values for magnetic interference fields with 

LXA/LXC systems may be obtained on request. 

2000 A 

1600 A 

1 10 

Distance (m) 

0.2 mTes 

7

General 

Sprinkler systems are used for fire protection in buildings and industrial 

applications. These fire extinguishing systems operate automatically. 

They operate by detecting, reporting and extinguishing 

fires as quickly as possible. A sprinkling time of at least 30 minutes 

can be expected here. 

Test results 

Siemens has therefore subjected the LXA/LXC busbar trunking 

system to a sprinkler test. Given the absenceof a binding standard, 

the tests were based on a realistic test setup. All mounting positions 

(horizontal edgewise, horizontal flat, as well as vertical) of the 

busbar and tap-off units were taken into consideration. Sprinkling 

was carried out for 90 minutes and the busbar system was exposed 

to the normal quantity of water used in fires. 

500 

Figure 10: Sprinkler test 

a Sprinkler 

b Pressure gauge 

c Shut-off valve 

d Tap-off unit 

e Trunking unit 

a 

b 

1 – 10 bar 

e 


Sprinkler test 

In order to test the operational readiness of the busbar trunking 

system during the sprinkler test, a high voltage test in accordance 

with EN 60 439-2 was carried out before and after the insulation 

resistance measurements. The test results confirm that the busbar 

system can be put into operation directly after sprinkling without 

any delay necessary. 

The high availability of an installed LXA/LXC busbar system, can be 

maintained without faults even under the extremely wet conditions 

produced by sprinkling. This reliability in operation is made possible 

firstly by the high degree of protection and the design which 

prevents ingress of large quantities of water. 

c 

d 

Siemens LV 72.T · 2004 4/17 

4

4 


Sprinkler test 

Comparison of busbar trunking and cable installation systems 

Feature Busbar trunking Cable installation 

TTA system K – 

Mechanical safety High Low 

Fire load Low High 

Thermal characteristics Ambient temperature 

acc. to IEC/EN 60 439-1 and -2 

max. +40 °C and +35 °C averaged over 24 hours 

System structures Clear, due to linear system structure with 

in-line consumer tap-offs via tap-off units 

Protective devices for consumers In the tap-off unit: means direct and immediate onthe-spot 

identification of assignment to consumer 

4/18 


In accordance with DIN 57 298 Part 4/ 

VDE 0298 Part 4/2.88 cable loads are based on 

+30 °C. 

Very large accumulation ofcables at feed point due to 

point-to-point supply ofconsumers from central 

power distribution unit. 

Centrally in the distribution board: means identification 

of assignment to consumer not possible directly. 

It is necessary to rely on the correctness of the 

labelling ofcables and consumers. 

Space requirements Low High since suitably large distribution systems are 

required. Routing criteria (cable accumulation, type of 

routing, current-carrying capacity, etc.) must be 

complied with. 

Retrofitting capability ifconsumer 

tap-offs changed 

High level offlexibility due to tap-off points in the 

trunking unit and a great number of different tap-off 

units 

Planning and engineering Simple and fast with the use ofcomputer-aided 

planning tools 

Dimensioning 

(current, voltage drop, 

protective earthing conditions) 

Not complex Very complex 

Fault location Low High 

Only possible at great expense. Laying additional 

cables from the central distribution board to the 

consumer. 

Highly intensive engineering (distribution and cable 

layouts, cable plans, etc.).

NetPlan 

NetPlan is a design software for calculating load flow, short-circuits 

and dimensioning for all kinds of low-voltage systems. 

The type data base 

It contains all the specific device data for equipment such as motors, 

circuit-breakers and fuses, cables, busbar trunking systems, 

couplings and transformers. This master data can either be selected 

from the available libraries or entered by the user into new libraries. 

Load flow calculation 

Loads, feeders, compensation units and switch positions can be 

changed in the selected system type in order to calculate the load 

flow. The graphic shows the results, such as voltage on the system 

nodes, current or percentage utilization, apparent power or the 

percentage utilisation of a transformer. Values outside of the set 

limits are marked accordingly. 


Engineering Tools 

Short-circuit calculation 

In the selected system type, the minimum or maximum initial 

symmetrical short-circuit current Ik" can be calculated for the 3-pole 

short-circuit, 2-pole short-circuit, 1-pole short-circuit at any node. 

The partial short-circuit currents in the network are also calculated 

and shown in the graphic. The peak short-circuit current Ip on the 

busbar or at the connection is also calculated. 

Dimensioning 

The circuit-breakers, switch-disconnectors and fuses are selected 

from the database, taking into account the short-circuit values and 

time and current selectivity. 

Siemens LV 72.T · 2004 4/19 

4

4 


Notes 

4/20 


■

Annex 

5/2 Ordering notes 

5/3 Siemens contacts 

5/4 A&D-Online services 

5/5 Customer support 

5/6 Alphabetical index 

5/7 Condtions of sale and delivery, 

export regulations 


5 

5/2 

Annex 

Ordering notes 

■ Al and Cu surcharges 

■ Small orders 

Surcharges for copper (Cu) and aluminium (Al) will be added to When small orders are placed, the costs associated with order 

the product prices; these surcharges will take the form of per- processing are greater than the order value. We recommend 

centages of the list prices. Calculation of the surcharges will be therefore that you combine several small orders. Where this is 

governed by the official Al quotation for aluminium and by the not possible, we unfortunately find it necessary to charge a 

Cu-DEL quotation applying on the date of receipt of order or of processing supplement of € 20.-- to cover our costs for order 

call-off. 

processing and invoicing for all orders with a net goods value 

of less than € 250.--. 

■ Selection and ordering data: type 

If a type designation contains * characters, it is not complete 

and must be supplemented according to specifications in the 

list. 

■ Article number extension 

When ordering from the catalog the prefix BVP: must be placed 

before the article number listed in the catalog. 

For example, 034262 is the article number in the catalog. To 

place the order, please quote BVP:034262. The price list already 

contains the article numbers with the BVP: prefix. 


■ Siemens contacts world wide 

Annex 

Siemens contacts 

At 

www.siemens.com/automation/partner 

you can find details of Siemens contact partners worldwide responsible 

for particular technologies. 

You can obtain in most cases a contact partner for 

• Technical Support, 

• Spare parts/repairs, 

•Service, 

• Training, 

• Sales or 

• Consultation/engineering. 

You start by selecting a 

• Country, 

• Product or 

•Sector. 

By further specifying the remaining criteria you will find exactly 

the right contact partner with his/her respective expertise. 

Siemens LV 72.T· 2004 5/3 

5

5 

5/4 

Annex 

A&D-Online services 

■ A&D in the WWW 

■ Product Selection Using the Interactive Catalog 

■ Easy Shopping with the A&D Mall 

Siemens LV 72.T· 2004 

A detailed knowledge of the range of products and services 

available is essential when planning and configuring automation 

systems. It goes without saying that this information must always 

be fully up-to-date. 

The Siemens Automation and Drives Group (A&D) has therefore 

built up a comprehensive range of information in the World Wide 

Web, which offers quick and easy access to all data required. 

Under the address 

http://www.siemens.com/automation 

you will find everything you need to know about products, systems 

and services. 

Detailed information together with convenient interactive functions: 

The interactive catalog CA 01 covers more than 80,000 products 

and thus provides a full summary of the Siemens Automation 

and Drives product base. 

Here you will find everything that you need to solve tasks in the 

fields of automation, switchgear, installation and drives. 

All information is linked into a user interface which is easy to 

work with and intuitive. 

After selecting the product of your choice you can order at the 

press of a button, by fax or by online link. 

Information on the interactive catalog can be found in the Internet 

under 

http://www.siemens.com/automation/ca01 

or on CD-ROM: 

• Automation & Drives CA 01, 

Order No.: E86060-D4001-A110-C2-7600 

The A&D Mall is the virtual department store of Siemens AG in 

the Internet. Here you have access to a huge range of products 

presented in electronic catalogs in an informative and attractive 

way. 

Data transfer via EDIFACT allows the whole procedure from selection 

through ordering to tracking of the order to be carried out 

online via the Internet. 

Numerous functions are available to support you. 

For example, powerful search functions make it easy to find the 

required products, which can be immediately checked for availability. 

Customer-specific discounts and preparation of quotes 

can be carried out online as well as order tracking and tracing. 

Please visit the A&D Mall on the Internet under: 

http://www.siemens.com/automation/mall

.I 

In the face of harsh competition you need optimum conditions to 

keep ahead all the time. 

A strong starting position, a sophisticated strategy and team for 

the necessary support - in every phase. 

Service & Support from Siemens provides this support; with a 

complete range of different services for automation and drives. 

In every phase: from planning and startup to maintenance and 

upgrading. 

Our specialists know when and where to act to keep the productivity 

and cost-effectiveness of your system running in top form. 

■ Online support 

■ Technical consulting 

Technical assistance 

The comprehensive information 

system available round the 

clock via Internet ranging from 

Product Support and Service & 

Support services to Support 

Tools in the shop. 

www.siemens.com/ 

automation/service&support 

Support in the planning and designing 

of your project. From detailed 

actual-state analysis, 

target definition and consulting 

on product and system questions 

right up to the creation of 

the automation solution. 2 ) 

Expert technical assistance1 ) 

for low-voltage controlgear, 

switchgear and systems and 

electrical installation. 

Tel.: +49 (91 31) 7-4 38 33 

Fax: +49 (91 31) 7-4 28 99 

E-Mail: technical-assistance 

@siemens.com 

1) Contact: 

Technical assistance for product selection · Old/new coding · 

Competitor coding · Special versions · Special requirements · Sales promotion 

(Infoline). 

Your regional contacts for sales support (prices, discounts, delivery times). 

Technical support for commissioning support and after-sales service. 

Annex 

Customer support 

■ Configuring and software engineering 

Support in configuring and developing 

with customer-oriented 

services from actual configuration 

to implementation of the automation 

project. 2 ) 

■ Technical support 

■ Service on site 

■ Repairs and spare parts 

■ Optimization and upgrading 

Competent consulting in technical 

questions covering a wide 

range of customer-oriented services 

for all our products and 

systems. 

Tel.: +49 (180) 50 50 222 

Fax: +49 (180) 50 50 223 

E-Mail: ad.support@siemens.com 

With Service on site we offer services 

for startup and maintenance, 

essential for ensuring 

system availability. 

Tel.: +49 (180) 50 50 444 2 ) 

In the operating phase of a machine 

or automation system we 

provide a comprehensive repair 

and spare parts service ensuring 

the highest degree of operating 

safety and reliablity. 

Tel.: +49 (180) 50 50 4482 ) 

To enhance productivity and 

save costs in your project we offer 

high-quality services in optimization 

and upgrading. 2 ) 

2) For country-specific telephone numbers go to our Internet site 

www.siemens.com/automation/service&support 

Siemens LV 72.T· 2004 5/5 

5

5 

5/6 

Annex 

Alphabetical index 

A 

Accessories 3/20 

Ambient temperature 4/2 

Applications 

Buildings 2/8 

Industrial 2/8 

B 

Basic description of busbar 

trunking systems 800 A to 5000 A 3/4 

BD 01 busbar trunking system 2/2 

BD 2 busbar trunking systems 2/2 

Busbar trunking system 4/7 

Purpose 2/4 

Types 2/4 

Busbars 3/7 

C 

Cable connection 3/18, 3/19 

Cable connection area 3/16 

Cable entry 3/16 

Cable installation 4/18 

Calculating the rated current 4/2 

Calculating the voltage drop 4/3 

CD busbar trunking system 2/2 

Circuit-breakers 4/5 

Clamping brackets 3/20 

Clean earth 2/9 

Conditional short-circuit rating Icc 

3/19 

Conditonal short-circuit rating Icf 

3/18 

Conductor configurations 2/6, 2/9, 3/9 

Conformity and test certificates 3/4 

Connecting distribution boards 

Connection units for transformers 

3/14 

and distribution systems 3/14 

Contact device 3/16 

Cut-outs 4/11 

D 

Design concept for a power supply system 2/2 

Dimensioning 4/2 

Distribution board connection 3/11 

Diversity factor 4/2 

E 

Earth fault current 4/6 

1-pole 4/6 

EN 60 439-2 4/16 

F 

Feeder units 3/11 

Fire barrier 4/10 

Fitting 3/18, 3/19 

Fixing between floors 4/15 

Fixing brackets 

For horizontal installation 3/20 

For vertical installation 3/20 

Fixing from ceilings 4/14 

Functional endurance 4/9 

I 

Implementing the tap-offs 3/16 

Incoming cable connection 3/15 


Page Page Page 

J 

Joint block 3/20 

Junction units 3/11, 3/12 

K 

Knee 3/12 

L 

LD busbar trunking system 2/2 

Load distribution factor 4/3 

Loop impedance 4/6 

LX sandwich system 2/2 

LXA/LXC selection 2/12 

M 

Magnet field measurements 4/16 

Magnetic fields 2/7, 4/16 

Maximum connectable cross-section 3/18, 3/19 

Maximum fixing intervals 2/7 

Maximum number of tap-offs with pluggable 

tap-off units over 3 m length when using 

tap-off units 2/7 

Minimum limb lengths 3/12, 3/13 

Mounting positions 3/7 

N 

Neutral conductor cross section 2/9 

Non-Siemens distribution boards 3/14 

O 

Offset elbow 3/12 

Optional lengths 3/11 

Optional lengths with 1 tap-off point 3/11 

Orientation feature 3/17 

Overload and short-circuit protection 4/5 

P 

PE conductor cross-section 2/9 

Permanently installed tap-off units 3/17 

Planning and engineering 4/18 

Planning example 4/7 

Planning trunking layout 4/7 

Pluggable tap-off 3/16 

Power distribution 2/5 

Power distribution board 4/7 

power supply 

Design concept 2/2 

Power transmission 2/5 

Protective devices 4/5 

R 

Rated current 3/7 

Rated currents of standard transformers 2/11 

Rated diversity factor 4/8 

Retrofitting capability 4/18 

S 

Safe disconnection 4/6 

Safety during operation 3/16 

Selection of LXA/LXC or LDA/LDC 2/6 

Separate PE connection 3/16 

Short-circuit current 2/11 

Short-circuit currents of standard transformers 2/11 

Short-circuit rating 3/18 

Short-circuit voltage uk 

2/11 

Sizes 3/8 

Space requirements 4/18 

Spring brackets 4/13 

Sprinkler test 4/17 

Standard lengths 

Standard lengths with 1, 2, 4, 5, 6, 8 

3/11 

or 10 tap-off points 3/11 

Standard temperature curve (ETK) 

Standard transformers 

4/9 

Rated currents 2/11 

Short-circuit currents 2/11 

Straight trunking units 3/11 

System structure 4/18 

System types 4/7 

T 

T unit 3/13 

Tap-off 3/16 

Tap-off point 3/16, 4/7 

Tap-off points selectable on both sides 3/11 

Tap-off points selectable on one side 3/11 

Tap-off units 2/5, 3/16 

Tap-off units from 80 to 630 A 3/16 

Tap-off units from 800 to 1250 A 3/17 

Tap-off units with fuse circuit-breaker 

up to 1250 A 3/19 

Tap-off units with fuse switch-disconnector 

up to 630 A 3/18 

Tap-off via joint block 3/17 

Tender specifications 3/4 

Thermal resistances 4/3 

Transformer connection of busbar systems 3/14 

Transformer connection units 3/14 

Transformer rated values 2/12 

TTA system 4/18 

Type reference key 3/6 

U 

Universal connector unit 3/14 

Utilization factor 4/8 

V 

VDE 0107 4/16 

VDE 0108 4/9 

Vertical fixing 4/13 

Voltage drop 2/7 

Voltage drop graphs for LXA/LXC 4/3 

W 

Wall cut-out 4/11 

Wall fixing 4/15 

Z 

Z unit 3/12

Annex 

■ Terms and Conditions of Sale and Delivery 

By using this catalog you can acquire hardware and software 

products described therein from the Siemens AG subject to the 

following terms. Please note! The scope, the quality and the 

conditions for supplies and services, including software products, 

by any Siemens entity having a registered office outside 

of Germany, shall be subject exclusively to the General Terms 

and Conditions of the respective Siemens entity. 

for customers with a seat or registered office in the Federal 

Republic of Germany 

The General Terms of Payment as well as the General Conditions 

for the Supply of Products and Services of the Electrical 

and Electronics Industry shall apply. 

For software products, the General License Conditions for Software 

Products for Automation and Drives for Customers with 

Seat or registered Office in Germany shall apply. 

for customers with a seat or registered office outside of 

Germany 

The General Terms of Payment as well as the General Conditions 

for Supplies of Siemens, Automation and Drives for Customers 

with a Seat or registered Office outside of Germany 

shall apply. 

For software products, the General License Conditions for Software 

Products for Automation and Drives for Customers with 

Seat or registered Office outside of Germany shall apply. 

General 

The prices are in € (Euro) ex works, exclusive packaging. 

The sales tax (value added tax) is not included in the prices. 

It shall be debited separately at the respective rate according 

to the applicable legal regulations. 

In addition to the prices of products which include silver, aluminium 

and/or copper, surcharges may be calculated if the respective 

limits of the notes are exceeded. 

Prices are subject to change without prior notice. We will debit 

the prices valid at the time of delivery. 

The dimensions are in mm. Illustrations are not binding. 

Insofar as there are no remarks on the corresponding pages, 

- especially with regard to data, dimensions and weights given 

- these are subject to change without prior notice. 

Comprehensive Terms and Conditions of Sale and Delivery are 

available free of charge from your local Siemens business office 

under the following Order Nos.: 

•6ZB5310-0KR30-0BA0 

(for customers based in the Federal Republic of Germany) 

•6ZB5310-0KS53-0BA0 

(for customers based outside of theFederal Republic of 

Germany) 

or download them from the Internet: 

www.siemens.com/automation/mall 

(Germany: A&D Mall Online-Help System) 

■ Export regulations 

Annex 

Conditions of sale and delivery 

The products listed in this catalog / price list may be subject to 

European / German and/or US export regulations. 

Therefore, any export requiring a license is subject to approval 

by the competent authorities. 

According to current provisions, the following export regulations 

must be observed with respect to the products featured 

in this catalog / price list: 

AL Number of the German Export List. 

Products marked other than “N“ require an export 

license. 

In the case of software products, the export designations 

of the relevant data medium must also 

be generally adhered to. 

Goods labeled with an “AL not equal to N“ are 

subject to a European or German export authorization 

when being exported out of the EU. 

ECCN Export Control Classification Number. 

Products marked other than “N“ are subject to a 

reexport license to specific countries. 

In the case of software products, the export 

designations of the relevant data medium must 

also be generally adhered to. 

Goods labeled with an “ECCN not equal to N“are 

subject to a US re-export authorization. 

Even without a label or with an “AL: N“ or “ECCN: N“, authorization 

may be required due to the final destination and purpose 

for which the goods are to be used. 

The deciding factors are the AL or ECCN export authorization 

indicated on order confirmations, delivery notes and invoices. 

Errors excepted and subject to change without prior notice. 

A&D/VuL/En 14.11.03 

Siemens LV72.T · 2004 5/7 

5

5 

Notes 

5/8 

Annex 

Published by Siemens AG Order No.: 

Automation and Drives E86060-T1872-A101-A1-7600 

Low-Voltage Controls and Distribution 

P.O. Box 32 40, D-91050 Erlangen Printed in the Federal Republic of Germany 

Germany KG K 0604 0.3 BD 96 En/423099 

Siemens LV72.T · 2004 

■

Automation and Drives Catalog 

Interactive catalog on CD-ROM 

• The Offline Mall of Automation and Drives CA 01 

Automation Systems for Machine Tools 

SINUMERIK & SIMODRIVE NC 60 

Cables, Connectors and System Components NC Z 

Drive Systems 

Variable-Speed Drives 

SINAMICS G150 Drive Converter Cabinet Units D11 

SINAMICS G110 Inverter Chassis Units D11.1 

DC Motors DA 12 

DC Drives Preferred Series up to 500 kW DA 12.1 

DC Drives Preferred Series 215 kW to 1500 kW DA 12.2 

SIMOREG DC MASTER 6RA70 Digital Chassis 

Converters 

DA 21.1 

SIMOREG K 6RA22 Analog Chassis Converters DA 21.2 

SIMOREG DC MASTER 6RM70 Digital Converter 

Cabinet Units 

DA 22 

SIMOVERT PM Modular Converter Systems DA 45 

SIEMOSYN Motors DA 48 

MICROMASTER 410/420/430/440 Inverters DA 51.2 

MICROMASTER 411/COMBIMASTER 411 DA 51.3 

SIMOVERT MV Medium-Voltage Drives DA 63 

SIMOVERT MASTERDRIVES Vector Control DA 65.10 

SIMOVERT MASTERDRIVES Motion Control DA 65.11 

Synchronous and asynchronous servomotors for 

SIMOVERT MASTERDRIVES 

DA 65.3 

SIMODRIVE 611 universal and POSMO 

Low-Voltage Three-Phase-Motors 

DA 65.4 

Project Manual M 10 

Squirrel-Cage Motors, Totally Enclosed, Fan-Cooled M 11 

Automation Systems for Machine Tools SIMODRIVE 

• AC Main Spindle Motors 1PM, 1FE, 1PH 

• AC Servomotors 1FT, 1FK 

• AC Linear motors 1FN 

• Converter System SIMODRIVE 611 

• Converter Systems SIMODRIVE POSMO A/CD/CA/SI 

NC 60 

Drive and Control Components for Hoisting Equipment HE 1 

Electrical Installation Technology 

PDF: ALPHA Small Distribution Boards and 

ET A1 

Distribution Boards 

PDF: ALPHA Side-by-Side Switchgear Cabinets ET A3 

PDF: ALPHA FIX Terminal Blocks ET A5 

PDF: BETA Modular Installation Devices ET B1 

PDF: DELTA Switches and Outlets ET D1 

PDF: GAMMA Building Management Systems ET G1 

Human Machine Interface Systems SIMATIC HMI ST 80 

Industrial Communication and Field Devices IK PI 

PDF: These catalogs are only available as pdf files. 

The catalogs of the 

Automation and Drives Group (A&D) 

Further information can be obtained from our 

branch offices listed in the appendix of this catalog 

Low-Voltage Controls and Distribution Catalog 

Low-Voltage Switchgear – Controlgear for Industry LV 10 

Sensor Technology – BERO – Sensors for Automation LV 20 

Power Distribution – Products and Systems 

LV 30 

for Low-Voltage Power Distribution 

SIVACON 8PS Busbar Trunking Systems CD, BD01, LV 70 

BD2 up to 1250 A 

SENTRON WL NS WL 

Motion Control System SIMOTION PM 10 

Process Instrumentation and Analytics 

Field Instruments for Process Automation 

FI 01 

Measuring Instruments for Pressure, 

Differential Pressure, Flow, Level and Temperature, 

Positioners and Liquid Meters 

PDF: Indicators for panel mounting MP 12 

SIREC Recorders and Accessories MP 20 

SIPART, Controllers and Software MP 31 

SIWAREX Weighing Systems WT 01 

Continuous Weighing and Process Protection WT 02 

Gas Analysis Equipment for the Process Industry PA 10 

PDF: Process Analytics, 

Components for the System Integration 

PA 11 

SIPAN Liquid Analysis PA 20 

SIMATIC Industrial Automation Systems 

SIMATIC PCS Process Control System ST 45 

PDF: SIMATIC S5/505 Automation Systems ST 50 

Components for Totally Integrated Automation and 

Micro Automation 

ST 70 

SIMATIC PCS 7 Process Control System ST PCS 7 

PDF: Add-ons for the SIMATIC PCS 7 

Process Control System 

ST PCS 7.A 

SIMATIC Control Systems ST DA 

SIPOS Electric Actuators 

Electric Rotary, Linear and Part-turn Actuators MP 35 

Electric Rotary Actuators for Nuclear Plants MP 35.1/.2 

Systems Engineering 

Power supplies SITOP power KT 10.1 

System cabling SIMATIC TOP connect KT 10.2 

MOBY Identification Systems KT 21 

Industrial Microcomputers SICOMP KT 51 

System Solutions 

Applications and Products for Industry are part of the 

interactive catalog CA 01 

TELEPERM M Process Control System 

AS 235, AS 235H and AS 235K automation systems PLT 111 

PDF: AS 488/TM automation systems PLT 112 

Operating and monitoring with WinCC/TM PLT 123 

CS 275 bus system PLT 130 

A&D/3U/En 22.04.04

The information provided in this catalog contains descriptions 

or characteristics of performance which in case of actual use 

do not always apply as described or which may change as a 

result of further development of the products. An obligation 

to provide the respective characteristics shall only exist if 

expressly agreed in the terms of contract. Availability and 

technical specifications are subject to change without notice. 

Siemens Aktiengesellschaft 


Low-Voltage Controls and Distribution 

P. O. Box 3240, D-91050 Erlangen 

Token fee 0,00 € 

www.siemens.com/lowvoltage Order No. E86060-T1872-A101-A1-7600

LXA/LXC Busbar Trunking System

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