Motors-D81.1-complete-English-06-2020

© Siemens 2020
SIMOTICS XP 1MB1, 1MB5 explosion-protected motors
Orientation
■ Overview
Temperature classes and groups
Combustible gases and vapors are divided into temperature
classes according to their ignitability and into groups according
to their spark ignition capacity. The marking of a three-phase
motor with the codes for the type of protection, group and temperature
class specifies that it can be used without danger in
hazardous areas depending on the zone classification. The numerical
sequence of the codes for the group and temperature
class has been selected so that motors that satisfy the requirements
for a certain group and temperature class also satisfy the
requirements for lower groups and classes.
Temperature classes
Temperature class
of electrical
equipment
Maximum surface
temperature of electrical
equipment
T1 450 °C > 450 °C
T2 300 °C > 300 °C
T3 200 °C > 200 °C
T4 135 °C > 135 °C
T5 100 °C > 100 °C
T6 85 °C > 85 °C
Examples of the assignment of combustible gases and vapors
Group Temperature classes
T1 T2 T3 T4 T5 T6
Material
designation
Ignition
temperature
Material
designation
Ignition
temperature
Material
designation
Ignition
temperature
Material
designation
Ignition
temperature
Material
designation
Ignition
temperature
Ignition temperature of
gases or vapors
Material
designation
Ethyl acetate 460
n-Butyl
alchohol
340 Mineral
spirits
2)
Ignition
temperature
°C °C °C °C °C °C
IIA 1) Acetone 540 i-Amyl 380 Naphthas Acetaldehyde
140
acetate
Ethane 515 n-Butane 365 Petrol fuels 2)
Ethyl chloride 510 Cyclohexanone
Ammonia 630 1,2-Dichloroethane
430 Diesel fuels
440 Heating oils
2)
2)
5
Benzene 555 Acetic anhydride
330 n-Hexane 240
Acetic acid 485
Carbon 605
monoxide
Methane 595
Methanol 455
Methyl 625
chloride
Naphtalene 520
Phenol 595
Propane 470
Toluene 535
IIB 1) Coal gas 560 Ethanol 425 Hydrogen 270 Ethyl ether 180
(town gas)
Ethylene 425
sulfide
Ethylene 440
oxide
IIC 1) Hydrogen 560 Acetylene 305 Carbon
disulfide
Explosion Protection Directive 2014/34/EU
Explosion protection has been fully harmonized by Directive
2014/34/EU in Germany and in the other member states of the
European Union. The requirements of the new law came into
force on April 20, 2016. Since then only those devices and protection
systems that comply with Directive 2014/34/EU are permitted
to be placed on the market.
Directive 2014/34/EU and Directive 1999/92/EC specify that only
specific electrical equipment and devices are permitted to be
used in the zones. The devices are assigned to equipment
groups and categories.
Use of electrical equipment in accordance with EN 60079-14
Electrical equipment used in potentially explosive workshops
and storage areas must comply with EN 60079-14/ VDE 0165-1
"Explosive atmospheres - Part 14: Electrical installations design,
selection and erection". All other general regulations issued by
the responsible supervisory authorities and the Employer's
Liability Insurance Association or any specifically issued for
individual case are also applicable. A plant or system subject to
inspection is not permitted to be commissioned initially or following
a significant modification until the plant or system has been
inspected by an approved inspection agency for correctness of
assembly, installation, site conditions and safe operation, taking
into account the intended mode of operation. Devices compliant
with Directive 2014/34/EU are permitted to be commissioned in
accordance with the responsible supervisory authority.
(cf. German Health and Safety at Work Regulations (BetrSichV),
section 3, § 14)
95
1)
Subgroups IIA, IIB and IIC must be specified for the types of protection
Ex db, Ex eb and Ex ec described in this list in accordance with EN 60079-0.
2)
The minimum ignition temperature depends on the composition and lies
between 220 to 300 °C, over 300 °C in special cases.
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