Generac Power Systems quietpact 85d Owner's Manual page 34

Installation
• Carefully prepare conduit ends to prevent sharp edges from
cutting through wiring insulation.
• Route conduit so it does not interfere with generator movement.
• If using metallic conduit, vapor-seal the end of the conduit
where it enters the junction box. Do this because flexible metal-
lic conduit is not vapor proof along its entire length.
• All openings in the generator compartment for the passage of
wiring and conduit must be sealed and made vapor-tight.
Use a high-quality silicone rubber base sealant or other
approved method (such as, explosion-proof fittings) to seal
such openings.
2.6.5 POWER SUPPLY CORD
The power supply cord must comply with all applicable codes,
standards, and regulations. It must be large enough to handle the
full amperage to which it will be subjected.
2.6.6 GROUND FAULT CIRCUIT INTERRUPTERS
The National Electrical Code (NFPA 70, 551-7) requires that
ground-fault circuit interrupters (GFCIs) be installed on all external
and some internal electrical receptacles. Contact the manufacturer
or dealer for recommendations.
32
NOTE:
Figure 2.17 – Transfer Switch Isolation Method
2.6.7 ISOLATING DIFFERENT POWER SOURCES
Connections from the junction box must terminate in a double-
pole, double-throw transfer switch (Figure 2.17). An alternate
method for isolating different power sources includes using an
isolating receptacle (Figure 2.18). Whichever method is used, be
certain that both power sources are NOT connected at the same
time.

If the vehicle's electrical circuits can be
powered by any other source of electricity
(such as, a "dockside" power receptacle),
there must be no possibility of connecting
the different power sources to the vehicle's
circuits at the same time. The dockside (util-
ity) power source must be positively isolated
from the vehicle's circuits whenever the gen-
erator is operating. Failure to isolate the vehi-
cle's circuits from the dockside power supply
when the generator is running may result in
damage to the generator or in serious injury
or death to dockside (utility) power work-
ers due to backfeed of electrical energy.
Installation and connection of the generator
must comply with NFPA 70, Article 551, and
NFPA 1192 (latest editions).