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• From the junction box, route power supply wires
through approved 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.
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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 6.17. 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.
Figure 6.17 – Generator AC Output Leads
Line T1 (red) to T2 (white) is protected against overload
by a 30-amp circuit breaker (CB1). Use this line-to-neu-
tral connection separately to operate 120-volt, single-
phase, 60 Hertz, AC loads requiring up to 3,300 watts
of power for PrimePact 66G or 3,100 watts for
PrimePact 66LP . Line T3 (black) to T2 (white) also is
protected against overload by a 30-amp 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 gener-
ator. The neutral line (T2, white) on all units is a
grounded neutral.
Do NOT connect electrical loads in excess of any
circuit breaker rating or you will develop prob-
lems 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.
32 Generac
Power Systems, Inc.
®
Section 6 – Installation
PRIMEPACT 66G and 66LP Recreational Vehicle Generators
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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 generator
movement.
• If you use 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.
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6.7.5 ISOLATING DIFFERENT POWER SOURCES
Connections from the junction box must terminate in a
double-pole, double-throw transfer switch (Figure 6.18,
Page 33). An alternate method for isolating different
power sources is by using an isolating receptacle
(Figure 6.19, Page 33). Whichever method you use, you
must be certain that both power sources are NOT con-
nected at the same time.
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6.7.6 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. (See page 33 for illustration.)
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6.7.7 GROUND FAULT CIRCUIT INTERRUPTERS
The National Electrical Code (NFPA 70, 551-7) requires
that you install ground fault circuit interrupters (GFCIs)
on all external and some internal electrical receptacles.
Contact your manufacturer or dealer for recommenda-
tions.
6.8
BATTERY INSTALLATION
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6.8.1 RECOMMENDED BATTERY
Install a battery that meets the following requirements:
• The battery must be a 12-volt, automotive type
storage battery.
• For prevailing ambient temperatures above 32° F (0°
C), use a battery rated 70 amp-hours and capable of
delivering 400 cold-cranking amperes.
• For prevailing ambient temperatures below 32° F (0°
C), use a battery rated 95 amp-hours and capable of
delivering 400 cold-cranking amperes.
If the battery is to be used to power other vehicle
accessories, as well as start the generator, you may
need a battery with a larger capacity.
NOTE:
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