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AKD-20 AR / Entellisys AR Low-voltage Switchgear
Section 3. Switchgear Description
Cable Compartment
DANGER: Electrical arc flash hazard. Personal
protection equipment required. Turn off power to the
equipment before working inside.
The rear cable and terminal compartment (Figure 3.26)
provides for cable installation and terminations. The cable
bending space meets the requirements of the National
Electric Code. Various arrangements of single or double cable
terminals are provided, depending upon the purchaser's
requirements.
When specified, racks for the support of feeder cables are
located in the cable compartment. The actual support of the
cables is provided by lashing them to these racks.
Also located in the cable compartment are provisions for
terminating control wires between external devices and
control circuits within the switchgear equipment. Figure 3.27
shows this typical arrangement.
When furnished, the terminal boards (Figure 3.27) for such
connections are located in an enclosed vertical wiring trough
mounted on the side of the cable compartment. The trough is
of steel construction with bolted covers to provide an isolation
barrier between the control wiring and the adjacent power
cables.
A neutral bus, insulated from ground, is provided in the bus
area on switchgear designed for four-wire systems. The
neutral bus is located either near the top or near the bottom
of the cable compartment. It includes provisions for
terminating the neutral conductor of four-wire feeder cables
and also direct mounting of the neutral CT or neutral
Rogowski as required for those feeder system circuit breakers
having a ground fault trip function.
Cable Compartment Floor Plates
Bolted-on steel floor plates (Figure 3.28) are furnished in each
cable compartment.
Figure 3.26 Cable termination provisions
19
Courtesy of NationalSwitchgear.com
Figure 3.27 Control wiring termination trough
Internal Equipment Control Wiring
(1)
Terminal Boards
(2)
Space for Purchaser's Field Control Wiring
(3)
Figure 3.28 Cable compartment floor plates
©2016 General Electric. All rights reserved.
DEH-41473
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