ALPHA Distribution Boards and Terminal Blocks

© Siemens AG 2010
ALPHA 8HP Molded-Plastic Distribution Systems
Introduction
Installation conditions
Installation Measures Climatic conditions according to DIN 50010 Special operating and ambient
conditions
Indoor No further measures necessary An indoor climate is an environment in rooms that are
designed so that objects are largely separated from the
direct influence of an open-air climate
External
Outdoor
E.g. protected installation or protective
cover, if necessary with
additional walls and door (protective
cabinet).
Only permissible with measures
as for external installation
An external environment is an environment in rooms that are
designed so that objects are protected against direct sunlight
and precipitation and, if necessary, against wind, but
are otherwise exposed to an open-air climate.
An open-air climate is an environment that affects objects in
the open air
If the operating and ambient conditions
differ from the standard conditions to
DIN VDE 0660 Part 500, Item 6.1, appropriate
measures must be taken to protect and
maintain the operating capability of the
switchgear assembly for "Special operating
and ambient conditions" according to
Item 6.2 (mechanical protection, ventilation,
indoor heating, breathers, etc.).
Conversion from Pg to metric screw connections
We tested a new option for using metric screw connections with
the 8HP molded-plastic distribution system. The results of this
test showed that the Pg openings listed in the following table are
also able to accommodate metric screw connections. We have
used metric screw connections with lock nuts. Appropriate sealing
washers are used in order to ensure degree of protection
IP65.
The values for the tested conversions from Pg to
metric screw connections are shown in the following table.
The knockouts in the enclosure base parts need to be drilled out.
Heavy-gauge threaded joints Lock hasp diameter Metric screw connection Lock hasp diameter fits Lock hasp diameter must be
enlarged to
mm
mm
Pg 13.5 20.4 M20 ✔ --
Pg 16 22.5 M25 -- 25.4
Pg 21 28.3 M32 -- 32.4
Pg 29 37 M40 -- 40.4
Pg 36 47 M50 -- 50.5
Pg 42 54 M63 -- 63.6
Pg 48 59.3 M63 -- 63.6
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■ Design
The distribution system comprises five enclosure sizes with a
basic size of 307 mm.
The enclosures have knockouts for flange openings and cable
entries. They can be used for distribution board applications as
well as for stand-alone installations.
The covers are available in opaque or transparent versions
(size 2.5 only available in the transparent version).
The covers are equipped with quick-acting locks for tool actuation.
These can be replaced with locks for manual actuation.
The mounting depth of the enclosure is 147 mm. For enclosure
size 2 there is also a cover for a mounting depth of 212 mm, and
for enclosure size 2.5 there is a transparent cover for a mounting
depth of 185 mm.
Intermediate frames can be used to increase the mounting
depth of size 3 and 4 enclosures. Several intermediate frames
can be used together. Each intermediate frame increases the
mounting depth by 92.5 mm.
Installation conditions for different climatic conditions, "Application
– Installation Conditions". If installed in rooms with high humidity
and strongly fluctuating temperatures, suitable measures
must be taken (e.g. ventilation, indoor heating) to prevent the
generation of harmful condensation water. In the event of extreme
temperature fluctuations, breathers must be installed.
Siemens ET A1 · 10/2009
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