Rockwell Automation 2100 CENTERLINE Low Voltage Motor Control Centers User Manual
Page 75
Rockwell Automation Publication 2100-IN012E-EN-P - February 2012
75
Final Checklist Before Energizing Chapter 7
The factory-made power bus connections are tightened by a computer-
controlled torquing system. The following connections do not require re-
torquing:
• vertical to horizontal bus connections.
• power conductor to horizontal bus connections.
These factory-made horizontal to vertical bus connections do not
require servicing for the life of the MCC.
6.
Check and verify that all ground connections are made properly, based on
local standards.
If ground bus is not provided or has been removed, check that the MCC
sections are connected to provide a continuous ground path. Verify that
100 ms units are connected to the vertical equipment load ground bus.
7.
Check the field wiring.
a. Check the field wiring for proper conductor sizing.
MCC field conductors should be sized by using the National Electrical
Code (NEC) 75 °C (167 °F) wire tables.
b. Removal of barrier or barriers may have been required for field wiring.
Check that all barriers and parts that may have been removed during
installation have been reinstalled.
c. Check that all incoming and outgoing power wiring is secure and
braced to withstand the effects of a fault current as detailed in
.
d. Check that conduit and cabling are well supported.
For incoming line compartments, 2.0 space factors, 26 in. (660.4 mm)
or less, the incoming cables should be firmly secured halfway between
the top of the section and the incoming line compartment terminals. In
a full section (6.0 space factor) incoming line compartments the cables
should be braced every 12 in. (305 mm); if the system’s available short
circuit current is above 42,000 A but less than 65,000 A rms
symmetrical. Above 65,000 A rms symmetrical available current bracing
should occur every 6.5 in. (165 mm). This bracing is in accordance with
the Underwriters Laboratories (UL) listing and is necessary to
withstand forces resulting from high fault currents. For information on
cable bracing methods, see
of this publication.
e. Check the integrity of all field connections.
Recommended torque values not found on individual devices can be
found on the unit wiring diagrams.
f. Check field wired connections made to the MCC for agreement with
wiring diagrams and verify that proper spacings between adjacent
phases and/or phases to ground are being used. Refer to page
85
for the
minimum electrical spacing requirements.
TIP
We recommend that a barrier checklist is developed including
such items as, unit location, and barrier location. This checklist
should be saved for future reference.