Generac Power Systems 00802-3 - Manual (Page 26)

ELECTRICAL CONNECTIONS
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 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.
ELEamCAL
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 gen­
erator). Route the generator's AC output leads into this
junction box through approved flexible conduit, and
into this junction box. This is the point of first termina­
tion 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 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 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 termi­
nates 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 connect­
ed 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 CONNECTIONS
Generator AC output leads T1 (black) and T2 (white)
come out of the generator as shown in Figure 28. Lead
T1 (black) is “hot.” Lead T2 (white) is the “neutral” lead
and is internally connected to ground. The green lead
(0) connects to ground in the junction box of the recre­
ational vehicle.
Figure 28 — Generator AC Output Leads
Line T1 (black) is protected against overload by the cir­
cuit 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 all 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 move­
ment.
• If you use metallic conduit, vapor seal the end of the con­
duit where it enters the junction box. Do this because flexi­
ble metallic conduit is not vapor proof along its entire
length.
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