Generac Power Systems 0940-1 - Manual (Page 30)

ELECTRICAL CONNECTIONS
The following general rules apply to electrical connec­
tions in a recreational vehicle:
• Qualified electricians who are familiar with applicable
codes, standards and regulations should install electrical
wiring.
• The wiring should comply with codes, standards and regu­
lations. The National Electric Code (NFPA 70), as well as
state and local codes, apply.
• Switches and circuit breakers should be of a type approved
for use in recreational vehicles and must be mounted and
installed to prevent damage from road shock.
• Wiring must be of adequate size, with approved insulative
qualities, and properly supported.
• Conduit and wire openings into generator compartment (if
used) must be vapor-sealed, to prevent entry of flamma­
ble, explosive or poisonous gases into the vehicle.
WIRING
• Wiring should be of stranded copper to reduce chance that
vibration may cause breakage.
• Wire gauge size of wires should be large enough to handle
at least 115% of the installed generator's rated maximum
current.
• If neutral conductors are used, they must be the same size
as other leg wires.
• Route power supply conductors from generator DC output
leads +DC (Red) and -DC (Blue), the return (Black) and
the ground (Green) wire through approved flexible conduit,
through the compartment floor and to the terminal block
located in the DC junction box on the inverter. Refer to
ANSI/RVIA standard EGS-1-1993 for conduit selection.
• If flexible metal conduit is used between the generator and
the compartment junction box, the conduit end that termi­
nates at the compartment junction box must be vapor-
sealed. Flexible metal conduit is NOT vapor tight along its
entire length.
• From the AC output junction box on the inverter, route the
three wires T1 (Black), T2 (White), and the Green ground
wire through approved flexible conduit to either (a) double­
pole, double-throw transfer switch, or (b) approved isola­
tion receptacle. Connecting to a transfer switch or isolation
receptacle must prevent vehicle electrical circuits from
being connected to two different power supplies at the
same time (such as generator and dockside power).
• Conductors must be rated 221 °F (105°C) or must be of a
larger conductor size.
GENERATOR AC CONNEQION
SYSTEM
The Impact plus AC generator output is provided by
the remote located inverter module. 120V AC is provid­
ed from the terminal block located inside one of the J
boxes on the inverter unit (Figure 31). The unit is pro­
vided with a ground which is connected to the genera­
tor and should be connected to the chassis of the
recreational vehicle.
Figure 31 — Inverter J Box for AC Output
Circuit breaker protection is provided on the generator
and protects the unit against overload. Do not apply
loads which exceed the rated wattage capacity of the
generator. Add the watts or amperes of all lighting,
appliance, tool and motor loads that the generator will
operate at one time. This total should be less than the
units rated wattage/amperage capacity.
ISOLATING DIFFERENT
POWER SOURCES
Conductors from the junction box must terminate in a
double pole, double throw transfer switch (Figure 33
on Page 30). An alternate method for isolating different
power sources is by using an isolating receptacle
(Figure 34 on Page 30). Whichever method you use,
you must be certain that both power sources are NOT
connected at the same time.
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.
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