45
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
Power cable connections
Connect the main cables to the main lugs.
Before any main cable connections are made,
the cables should be identified to indicate their
phase relationship with the equipment. Adequate
electrical and mechanical clearances must be
provided between conduit, cables, and bus. Where
the cables enter the section, they can be lashed to
optional cable supports at the rear of the cable
compartment as required.
Mechanical cable terminals are normally included
with the switchgear (compression terminals are
supplied when ordered) and are mounted at the
ends of the breaker runbacks in the cable
compartment. Carefully follow the cable
manufacturer's recommendations fo
installation of cable.
Install the cables in the proper path to the
terminals, using temporary lashing if required.
Cut the cables to the proper length. Strip the
insulation to the desired dimension, being
careful not to damage any strands.
For copper cables, coat the wires with lubricating
grease, insert the cables into the terminals, and
tighten the set screws in accordance with torque
values shown in the torque value table for cable
terminals in the addendum of this manual. See
Appendix A, Table A.3.
For aluminum cables, wire brush the wire strands
thoroughly. Immediately after wire brushing, coat
the cable strands with a quality oxide inhibiting
compound such as Penetrox A. Insert exposed
wires into the terminals and tighten the set screws
in accordance with values shown in the torque
Table A-3 in Appendix A of this Instruction Book.
Caution: The torque values shown in the
table are for dry threads only. Do not grease
or otherwise lubricate the threads on the
cable terminals as this will permit over-
tightening of the screw and possible
damage to the terminal or cable.
Prudence: Les tensions de serrage indiquées
dans le tableau sont valables uniquement
pour des filetages secs. Ne graissez pas et
ne lubrifiez pas les fils des extrémités de
câbles. Cela risquerait d'entraîner un serrage
excessif de la vis et d'endommager
l'extrémité ou le câble.
Control wire connections
For external control wiring, refer to Fig. 4.23 for
switchgear cable area dimensions, and connect the
control wires to the switchgear sectionas follows:
1. When control conduits enter the switchgear from
below, they should not extend more than one inch
above the floor. The control wires may be pulled
through the conduits before or after the
switchgear is installed.
2. Route the control wires from the conduits
through the wiring trough (cross-hatched area-
2" x 7"-shown on Fig. 4.23) at the side of the cable
compartment. Connect the cables to the terminal
blocks in accordance with the connection
diagrams for the equipment.
3. If the control conduits enter from above, drill the
top cover within the available space indicated.
See Fig. 4.23. Control wires should be routed to
the wiring trough and connected to the terminal
blocks as described previously.
—
Fig. 4.23
Control wire entry space
(indoor enclosure)
Equipment Depth
“A” (inches)
Direction
of Leads
“B”
54"
Below
19
Above
24
60"
Below
25
Above
30
67"
Below
32
Above
37
74"
Below
39
Above
44
Table 4.23 - Floor plan
