1 Publication 2100-IN012B-EN-P—April 2005
Chapter
10
Maintenance After Fault Condition
Maintenace After 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,
de-energize the motor control center, investigate the cause of the fault and
inspect all equipment thoroughly per NEMA Standards Publication No. ICS
2.3-1995, Instructions for the handling installation operator and maintenance of MCCs not
rated more then 600 Volts, Section 11, “Maintenance after a Fault has Occurred.”
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 (merger) may be required. Refer to Chapter 3,
Final Checklist Before Energizing.
ATTENTION
Disconnect all power sources to the motor control center
before diagnosing the cause of a fault condition.
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