Isolating different power sources, Power supply cord, Ground fault circuit interrupters – Generac Power Systems 00862-1 User Manual
Page 27
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• If you use metallic conduit, vapor seal the end of the con
duit where it enters the junction box. Do this because
flexible metallic conduit is not vapor proof along its entire
length.
ISOLATING DIFFERENT
POWER SOURCES
Connections from the junction box must terminate in a
double pole, double throw transfer switch (Figure 30).
An alternate method for isolating different power
sources is by using an isolating receptacle (Figure 31
on Page 26). Whichever method you use, you must
be certain that both power sources are NOT connect
ed at the same time.
POWER SUPPLY CORD
The power supply cord must comply with all applica
ble codes, standards and regulations. It must be large
enough to handle the full amperage to which it will be
subjected.
GROUND FAULT CIRCUIT
INTERRUPTERS
The National Electric Code (NFPA 70, 551-7) requires
that you install ground fault circuit interrupters
(GFCIs) on all external and some internal electrical
receptacles. Contact your manufacturer or dealer for
recommendations.
Figure 30 — Transfer Switch Isolation Method
2ND AIR
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