Generac Power Systems 4270-0 - Manual (Page 34)

INSTALLATION
Section 2 - Installation
QUIETPAG^“ 75D Recreational Vehicle Generator
♦ 2.6.4 CONDUIT
Route the connections between the generator and the
junction box through approved, flexible conduit. The
following general rules apply:
• All wiring, conduit and interconnections must be
installed in compliance with applicable codes,
standards and regulations.
• Cut wiring to the required length and allow extra
wire for junction box connections.
• Carefully prepare conduit ends to prevent sharp
edges from cutting through wiring insulation.
• Route conduit so it does not interfere with genera­
tor movement.
• If you use metallic conduit, vapor seal the end of
the conduit where it enters the junction box. Do
this because flexible metallic 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.
NOTE:
Use a high quality silicone rubber base sealant or
other approved methods (such as explosion proof
flttings) to seal such openings.
♦ 2.6.5 POWER SUPPLY CORD
The power supply cord must comply with all applic­
able 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 you install ground fault circuit inter­
rupters (GFCIs) on all external and some internal
electrical receptacles. Contact your manufacturer or
dealer for recommendations.
♦ 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 is by using an isolating receptacle
(Figure 2.18). Whichever method you use, you must
be certain that both power sources are NOT connect­
ed at the same time.
DANGER
A
If the vehicle electrical circuits can be powered by
any other source of electricity (such as a "dock-
side" power receptacle), there must be no possibil­
ity of connecting the different power sources to
the vehicle circuits at the same time. The dockside
(utility) power source must be positively isolated
from the vehicle circuits whenever the generator is
operating. Failure to isolate the vehicle circuits
from the dockside power supply when the gener­
ator is running may result in damage to the gener­
ator or serious injury or death to dockside (utility)
power workers due to backfeed of electrical ener­
gy. Installation and connection of the generator
must comply with ANSI A119.2/NFPA 501C and
ANSI/RVIA EGS-1 (latest editions).
Figure 2.17 - Transfer Switch Isolation Method
2ND AIR
32 Generac* Power Systems, Inc.