Amprobe INSP-3 Wiring-Inspection-Tester - Manual (Page 15)

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loose connection or if the wiring run is too long
or has too small a gauge wire for the length of
the run. The electrical code states that “. . . where
the maximum voltage drop on both feeders
and branch circuits to the farthest outlet does
not exceed 5 percent, will provide reasonably
efficiency of operation” (Sec. 210-19)
Possible problems creating excessive voltage drop:
a) Bad splice
b) Loose screw termination
c) Stripped thread on wire nuts or terminal screws
d) Faulty outlet
e) Undersize wiring (too long of run for wire size)
f) Loose connection at circuit breaker or fuse
g) Corroded connections
h) Overheating due to loose contacts
i) Faulty or poor quality push in connections on
receptacles
j) Cold forming on aluminum wiring, causing
loose connections
k) Worn switch or circuit breaker contacts.
NOTE: 15 amp systems should not be expected to
perform to 20 amp specifications
C) Ground Impedance Test – This test is not related
to the “set load” switch and is not affected by
voltage drop on the line. This test simply tells you
the quality of the outlet ground. Most computers