UFC 3 -520-01
June 10, 2002
6-5.11
Do not wrap aluminum foil or other conductive material around fuses to keep
temporary loads, such as Christmas lights on with fuses blown.
6-6
ACCEPTANCE TESTING OF WIRING SYSTEMS.
6-6.1
Ensure that the facility electrical acceptance process includes a detailed
inspection of the wiring system from the service entrance to the loads. Table 6 -1 shows
typical wiring -related problems that can be encountered.
Table 6-1. Electrical System Problems Caused by Improper Wiring
Wiring Problem
Effect on Facility
Loose connections
Impulses, voltage drop-out
Neutral-to -ground tie
Ground current
Neutral and ground reversal
Ground current
High impedance neutral (open) in
Extreme voltage fluctuation (high or low),
polyphase circuit
neutral to ground voltage fluctuation
High impedance neutral-to-ground bond at
Voltage fluctuation, neutral to ground
voltage fluctuation
High impedance neutral-to-ground bond at
Voltage fluctuation, neutral to ground
service entra nce
voltage fluctuation
High impedance open circuit grounding
Neutral to ground voltage fluctuation
6-6.2
If infrared scanning equipment is available, perform an infrared scan of
connections to identify high resistance connections. An infrared scan provides the best
information when the circuits being checked have been operating at full-load for at least
one hour so that connections have had time to heat up. Infrared scans of deenergized
or lightly loaded circuits will usually provide no useful information.
6-10
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