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3 . s w I TC h G e a r D e s C r I p T I o N
3.1 Receiving
This section contains a description of the
ABB low voltage switchgear. It also describes the
functions of the electrical and mechanical systems.
Figure 3.1 is a side view of a typical section
showing compartmentation.
3.2 Summary description
ABB low voltage switchgear is a freestanding
assembly of metal-enclosed sections containing
low voltage power circuit breakers, bus bars, cable
termination provisions, auxiliary power circuit
protective devices, controls, and instrumentation.
It may also be an integral part of a load center unit
substation, either singleended or double-ended.
3. Switchgear description
Intersectional
control wiring
trough
Breaker or
instrument
compartment
A
B
C
D
Breaker
compartment
Breaker
compartment
Breaker
compartment
Neutral bus
Vertical riser
bus bars
Cable termination
area
Breaker
compartment run
back and cable
termination
Main bus bars
Instrument
panel or
entelliguard
messneger
Vertical
control wire
gutter
Compartment
doors
Compartment
doors
Cable
compartment
doors
Ground bus
Enclosed trough
for external
control circuit
wiring
—
Fig. 3.1
Side-view section of
low voltage switchgear