Publication 2100-IN012C-EN-P - April 2009 75
Final Check List Before Energizing Chapter 7
structural damage is visible, the electrical spacings should be
intact. Refer to the tables starting on page 84
for the required
minimum electrical spacings.
3. Check and verify that the MCC is properly installed, as described
in Chapter 2
, and inspect and verify that it is level, supported,
and anchored.
4. Check the integrity of the bus splice connections.
Recommended torque values can be found on the information
label located on the interior of the vertical wireway door or on
the interior right-hand side plate of frame mounted units. See
Joining and Splicing Vertical Sections, publication 2100-IN010
,
for splicing information.
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.
5. 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.
6. 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.
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.
c. Check that all incoming and outgoing power wiring is secure
and braced to withstand the effects of a fault current as
detailed in Chapter 3
.
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