27
A K D - 20 A N D E NTE LLYS I S
LO W VO LTAG E S W I TC H G E A R
3.12 Feeder cable and busway
The rear cable and terminal compartment, Fig. 3.27,
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 compartments are
provisions for terminating control wires between
external devices and control circuits within the
switchgear equipment. Figure 3.28 shows this
typical arrangement.
1. Internal equipment control wiring
2. Terminal boards
3. Space for purchaser's field control wiring
1. Cable lugs (mechanical type)
When furnished, the terminal boards, Fig. 3.28,
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.
—
Fig. 3.27
Cable termination
provisions
—
Fig. 3.28
—
Fig. 3.27
—
Fig. 3.28
Control wiring
termination trough
1
1
2
3
