99Publication 2100-IN012C-EN-P - April 2009 99
Chapter
10
Maintenance After Fault Condition
Maintain the MCC After a
Fault Condition
The opening of the short circuit protective device (such as fuses or
circuit breakers) in a properly coordinated motor branch circuit is an
indication of a fault condition in excess of operating overload and
must be corrected.
Fault conditions can cause damage to control equipment. When a
fault occurs, follow this procedure.
1. De-energize the MCC.
2. Investigate the cause of the fault and inspect all equipment
thoroughly per NEMA Standards publication ICS 2.3-1995,
Instructions for the handling installation operator and
maintenance of MCCs not rated more than 600V, Section 11,
Maintenance after a Fault has Occurred.
3. Make necessary repairs to units, components and structures as
required, prior to reenergizing the equipment.
Be sure that replacement parts are suitably rated for the application.
An insulation resistance test (megger) may be required. Refer to
Chapter 7
.
ATTENTION
Make sure that the MCC remote power sources are
disconnected and that the respective disconnects are locked in
the OFF/O position.
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