GE Industrial Solutions Entellisys Low Voltage Switchgear - Manuel (Page 31)

Entellisys Low Voltage Switchgear
31
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 or shipped loose in one of the XS material boxes..
Carefully follow the cable manufacturer's recommendations for
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 GE lubricating grease
D6A15A2, 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.
ATTENTION: Les valeurs de couple indiquées dans le tableau
ne sont valables que pour des filets secs uniquement. Il ne faut
pas graisser ou librifier autrement les filets des câbles
terminaux, car cela produira un serrage excessif de la vis et
possiblement des dommages au terminal ou au câble.
This should result in the oozing of compound material from
between individual strands. Wipe off any excess compound.
Bolt the cable terminal connectors to the ends of the bars in the
cable compartment. A non-oxidizing grease, such as GE
lubricating grease D6A15A2 furnished with each equipment,
should be used at these connection surfaces. The bolts should be
tightened in accordance with values shown in the torque Table A-
1 in Appendix A of this Instruction Book
Lash the cables securely to the cable support, if present, to take
their weight off the runbacks and to brace them against short
circuit forces in the event of a fault.
Line and Feed Through Cable Lashing Instructions for
Assemblies over 65kAIC (Refer to Fig. 4-18)
WARNING - Failure to follow the lashing instructions below may
result in equipment damage during a short circuit event
Fig. 4-18 Cable Lashing
 Use 3/8” diameter Nylon rope or equivalent (minimum
2000 lbs. tensile strength).
 Wrap the perimeter of ALL phase cables near lugs 10
times.
 Wrap perimeter wrap between phases five time each (2
places).
 Wrap each phase set five times jst behind the complete
perimeter wrap.
 Bundle all cables together with a perimeter wrapping
(five wraps) 6” to 12” from the first perimeter wrap.
 After second perimeter wrap the cables should be
wrapped at 12” increments until the cables diverge or
reach exit point of the switchgear.
IMPORTANT – Do not overlap rope wraps.