PB 1.1-2007
Page 20
10.10 SEVERE ELECTRICAL SHORT CIRCUIT
If a severe electrical short circuit has occurred, the excessive currents may have resulted in structural
component and/or bus and conductor damage due to mechanical distortion, thermal damage, metal
deposits, or smoke. Examine all devices and bus supports for cracks or breakage. The manufacturer should
be consulted before cleanup and correction is attempted.
10.11 GROUND FAULT PROTECTION SYSTEM
Test the ground fault protection system (if furnished) in accordance with the manufacturer's instructions. See
Section 230.95 of the National Electrical Code and NEMA Standards Publication PB 2.2, Application Guide
for Ground Fault Protective Devices for Equipment.
10.12 INSULATION RESISTANCE
Check insulation resistance (see 7.4) under any of the following conditions:
10.12.1 Severe Short Circuit
If a severe short circuit has occurred (see 10.10);
10.12.2 Parts Replaced
If it has been necessary to replace parts or clean insulating surfaces;
10.12.3 Panelboard Exposed to High Humidity
If the panelboard has been exposed to high humidity, condensation, or dripping moisture.
© Copyright 2007 by the National Electrical Manufacturers Association.
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