Catalog LV 70 2011 - Low & Medium Voltage - Siemens

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© Siemens AG 2011
BD2 System — 160 ... 1250 A
Introduction
Feeder units
For the incoming supply to BD2 runs, various feeder unit versions
are available to meet different requirements.
If using end feeder units in addition to a middle infeed, an additional
terminal block is required for each end feeder unit.
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Example: end feeder unit with connected cabling box
Features:
• Cables are introduced from the front face.
• Cable entry plate (aluminum) for single-core cable entry.
• Cable connection is via bolts. The bolts are included in scope
of supply.
• The factory-fitted jumper between PE and N can be removed
for connection of five-core cables.
• Feeder units are supplied without joint block.
• They are not directly mountable on junction units.
For double-ended infeed, an additional joint block is required.
BD2.-...-EE end feeder unit and BD2.-...-ME center feeder unit
End feeder units
Cable entry is from the front; cable entry from the side is possible
for the version with a BD2.-...-EE-KR cabling box.
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BD2.-...-EE and BD2.-...-EE-KR end feeder units
The phase sequence can be changed on site by rotating the
busbar pack.
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BD2.-...-EE double-end feeder unit
To distribute large amounts of power with small busbar crosssections,
it is sensible to use a center feeder unit in some cases.
It is mounted in the middle of a busbar line between two trunking
units. The left run and the right run are supplied simultaneously
with one supply cable. If using a 1000 A middle infeed, it is therefore
possible to infeed 2000 A. In this case, special consideration
must be given to the overload and short-circuit protection
of the busbar system.
If the short-circuit protection is not assured by the upstream protective
device and/or the overload is not due to the type and
number of loads, additional protective measures are required.
Two options are possible:
• Use of a center feeder unit with one coupling unit on the right
and left respectively next to the feeder unit. The coupling unit
must be equipped with a protective device (fuse or circuit
breaker) that ensures the short-circuit and overload function.
• Use of two end feeder units that are arranged centrally in the
busbar line. The two supply cables are separately fused in the
distribution system.
End feeder units with switch disconnector
End feeder units with switch disconnector
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