Generac Power Systems 004702-0, 004703-0, 004704-0, 004705-0, 004706-0, 004707-0 Owner's Manual page 33

6.7.1 ELECTRICAL JUNCTION BOX
Install an approved, square electrical junction box
with a blank cover on the interior or exterior wall
of the area planned for installation of the generator
(NOT on the generator). Route the generator's AC
output leads into this junction box through approved
flexible conduit. This is the point of first termination
for generator AC output leads.
6.7.2 WIRING
• Wiring should be of stranded copper to reduce the
chance that vibration may cause breakage.
• Wire gauge size should be large enough to handle at
least 115 percent 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 (red), T2 (white), T3 (black) and
the green ground wire through approved flexible
conduit to the electrical junction box on the com-
partment wall.
• If flexible metal conduit is used between the gen-
erator and the compartment junction box, the con-
duit 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 iso-
lation receptacle. Connecting to a transfer switch
or isolation receptacle must prevent vehicle electri-
cal circuits from being connected to two different
power supplies at the same time (such as genera-
tor and dockside power).
• Conductors must be rated 221° F (105° C) or must
be of a larger conductor size.
6.7.3 GENERATOR AC CONNECTIONS
Generator AC output leads T1 (red), T2 (white) and
T3 (black) come out of the generator as shown in
Figure 6.14. Leads T1 (red) and T3 (black) are "hot,"
while T2 (white) is the grounded neutral lead. There
is also a green lead that connects to ground in the
junction box of the recreational vehicle.
Line T1 (red) to T2 (white) is protected against
overload by a circuit breaker (CB1). Use this line-
to-neutral connection separately to operate 120-volt,
single-phase, 60 Hertz, AC loads. Line T3 (black) to
T2 (white) also is protected against overload by a cir-
cuit breaker (CB2). Use this line-to-neutral connec-
tion 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.
Section 6 – Installation
Recreational Vehicle Generators
Figure 6.14 – Generator AC Output Leads

Do NOT connect electrical loads in excess of any
circuit breaker rating or problems will develop
with circuit breaker tripping, which causes a loss
of AC output. Also, do NOT exceed the gener-
ator'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.
6.7.4 CONDUIT
Route the connections 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 genera-
tor movement.
• If using metallic conduit, vapor seal the end of the
conduit where it enters the junction box. Do this
because flexible metallic conduit is not vaporproof
along its entire length.
6.7.5 ISOLATING DIFFERENT POWER
SOURCES
Connections from the junction box must terminate in
a double-pole, double-throw transfer switch (Figure
6.15). An alternate method for isolating different
power sources is by using an isolating receptacle
(Figure 6.16). Whichever method is used, be certain
that both power sources are NOT connected at the
same time.
T3
T2
T1
Green
(Ground)
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