Generac Power Systems 91355 - Manual (Page 20)

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 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.
ELEamCAL JUNQION 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, and into this junction box. 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 (red) and T2 (white), T3 (black) and the green
ground wire through approved flexible conduit to the elec­
trical 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).
• Conductors must be rated 221°F (105“C) or must be of a
larger conductor size.
GENERATOR AC CONNEaiONS
Generator AC output leads T1 (red) and T2 (white)
and T3 (black) come out of the generator as shown in
Figure 23. Leads T1 (red) and T3 (black) are “hot,”
while T2 (white) is the grounded “neutral”. There is
also a green lead that connects to ground in the junc­
tion box of the recreational vehicle.
Figure 23 — Generator AC Output Leads
Line T1 (red) to T2 (white) is protected against over­
load by the circuit breaker (CB1). Use this line-to-neu-
tral connection separately to operate 120 volts, 1-
phase, 60 Hz, AC loads requiring up to 3600 watts
(3.6 kW) of power. Line T3 (black) to T2 (white) is
also protected against overload by a circuit breaker
(CB2). Use this line-to neutral connection separately
to operate similar loads. However, be sure the total
unit load does NOT exceed the maximum rating of
the generator. The neutral line (T2, white) on all units
is a grounded neutral.
NOTE: The generator may be reconnected for dual
voltage AC output. (See “Dual Voltage Reconnection
on page 3).”
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.
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