Power-Style™ QED-2 Switchboards
Section 4—Installation
32
© 1988–2018 Schneider Electric All Rights Reserved
80043-055-13
ENGLISH
Cable Pulling
Power-Style QED-2 switchboards are constructed to customer specifications for
the cable entrance arrangement (for example, top or bottom feed). Switchboard
components are arranged to give proper cable clearance and bending space for
cables entering or exiting the switchboard as specified on the equipment drawing.
1. Use only cable sizes suitable for a proper fit with the corresponding lugs.
2. Pull the proper number of line side and load side cables according to the load
served and the NEC or CEC.
3. Position the cables inside the switchboard so that they are not subject to
physical damage.
4. Maintain the largest possible bending radii and proper clearance to bus bars
and grounded parts. If any cables are lying or bearing on structural members,
support them to relieve this condition or place suitable protective material at the
bearing point to protect the cable insulation.
5. Be certain to run all phase conductors, including the neutral, through the same
opening where cables enter or leave the switchboard, or pass through any
metal that has magnetic properties. Otherwise, overheating can result. See
Section 300-20(a) of NEC.
6. When instructed, brace or cable-lace the conductors.
Cable Terminations
1. Use a proper insulation stripping tool to strip a length of insulation from the end
of the cable sufficient to fit into the full length of the lug barrel. Be careful not to
nick or ring the strands.
2. Thoroughly clean aluminum cable contact surfaces with a wire brush, or scrub
them with an abrasive cloth to remove oxides and foreign matter.
3. Immediately apply an acceptable joint compound to the bare
aluminum surfaces.
4. If compression-type lugs are furnished on any switch or circuit breaker, or as
the main incoming power lugs, unbolt and remove them to create sufficient
room for crimping the lugs to the cables with the crimping tool.
a. Insert the cable into the lug barrel and, using the crimping tool, make the
specified number of crimps per the recommendations of the manufacturer.
b. Wipe excess joint compound from the connector and insulation.
c. With the cables connected, remount the lugs onto the bus bars, switches,
or circuit breakers. Torque the bolts to the values given in “Section 9—
Torque Values for Electrical Connections” on page 51.
5. Set screw-type lugs may be furnished as main incoming lugs and are standard
on molded case circuit breakers and QMB/QMJ/QMQB
1
fusible switches.
Torque these lugs to,
but do not exceed
, the specified values. Torque values
for circuit breaker and switch lugs are marked on these units. Torque values for
other switchboard lugs are marked on the switchboard (Table 7 on page 51).
1
QMQB switches are available in Canada only.
