Generac Power Systems NP-30G Series - Electrical Connections; Wiring and Junction Box Guidelines

Be sure to read "Generator AC ·Connection System"
on Page 4.
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 reg-
ulations. 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 flam-
mable, explosive or poisonous gases into the vehicle.
ELECTRICAL JUNCTION BOX
Install an approved, square electrical junction box that
has a blank cover on the interior or exterior wall of the
area you plan to install the generator (NOT on the
generator). Route the generator's AC output leads
into this junction box through approved flexible con-
duit. This is the point of first termination for generator
AC output leads.
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 han-
dle at least 115% of the installed generator's rated maxi-
mum current.
• If neutral conductors are used, they must be the same
size as other leg wires.
• Route power supply conductors from generator AC output
leads T1 (black) and T2 (white) and the green ground
wire through approved flexible conduit to the electrical
junction box on the compartment wall.
If flexible metal conduit is used between the generator
and the compartment junction box, the conduit end that
terminates the compartment junction box, must be vapor-
sealed. Flexible metal conduit is NOT vapor tight along its
entire length.
• From the junction box route power supply wires through
approved conduit to either (a) double-pole, double-throw
transfer switch, or (b) approved isolation receptacle.
Connecting to a transfer switch or isolation receptacle
must prevent vehicle electrical circuits from being con-
nected to two different power supplies at the same time
(such as generator and dockside power).
ELECTRICAL CONNECTIONS
• Conductors must be rated 221 OF ( 1 05°C) or must be of a
larger conductor size.
GENERATOR AC CONNECTIONS
Generator AC output leads T1 (black) and T2 (white)
come out of the generator as shown in Figure 27.
Lead T1 (black) is "hot." Lead T2 (white) is the "neu-
tral" lead and is internally connected to ground. The
green lead (0) connects to ground in the junction box
of the recreational vehicle.
Line T1 (black) is protected against overload by the
circuit breaker (CB1). Use line T1-T2 to operate 120
volts, 1-phase, 60 Hz, AC loads.
CAUTION: Do NOT connect electrical loads in
excess of any circuit breaker rating or you will
develop problems with circuit breaker tripping,
which causes a loss of AC output. Also, do NOT
exceed the generator's rated wattage capacity. Add
the watts or amperes of ali lighting, appliance, tool
and motor loads the generator will operate at one
time. This total should be less than the unit's rated
wattage/amperage capacity.
CONDUIT
Route the conductors between the generator and the
junction box through approved, flexible conduit. The
following general rules apply:
• 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 generator
movement.
• 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.
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