92 Publication 2100-IN012C-EN-P - April 2009
Chapter 9 Maintenance
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.
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 and power conductor to horizontal bus
connections. These factory-made connections do not require
servicing for the life of the MCC.
5. Periodically clean or replace the air filters depending on the
environmental conditions.
6. Check for the proper function and freedom of movement (no
sticking or binding) for the disconnect handle operating and
defeater mechanisms.
7. Replace broken, deformed, malfunctioning, or badly worn parts
or assemblies.
8. Inspect unit bus-stab connections for wear or corrosion.
Wear and/or corrosion can increase resistance and cause an
increased temperature of the contact point, leading to failure.
Replace bus stabs if wear or corrosion is excessive. Lubricate
bus stabs with NO-OX-ID grease (catalog number 2100H-N18 or
2100H-N18T) before installing the unit into the section.
9. Inspect current carrying parts such as fuse clips, knife blades of
disconnects, and line and load terminals of devices for
discoloration, corrosion, or other signs of wear or possible
failure.
ATTENTION
When working on or near energized electrical
equipment, follow established electrical safety-related
work practices. Refer to NFPA 70E Standard for
Electrical Safety in the Workplace.
To prevent injury or death to personnel lubricating
disconnect switch contacts, make sure the MCC power
source(s) is disconnected and the respective
disconnect(s) is locked in the OFF/O position. For plug-in
units, remove the unit from the MCC.
To prevent personal injury or damage to equipment,
make sure that the unit handle operator is in the OFF/O
position before removing the unit.
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