Generac Power Systems 00862-2 - Manual (Page 32)

INSTALLATION
Section 2 - Installation
Series QP55-G Recreational Vehicle Generator
• 2.6.1 ELEgRICAL JUNCTION BOX___________________
Install an approved, square electrical junction box
with 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 flex­
ible conduit. This is the point of first termination
for generator AC output leads.
• 2.6.2 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 1 15 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 compartment wall.
If flexible metal conduit is used between the gener­
ator and the compartment junction box, the con­
duit end that teniiinates the compartment junc­
tion box must be vapor-sealed. Flexible metal con­
duit is NOT vapor tight along its entire length.
• From the junction box, route power supply wares
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.
• 2.6.3 GENERATOR AC CONNECTIONS
Generator AC output leads T1 (red), T2 (white) and
T3 (black) come out of the generator as shown in
Figure 2.16. 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 2.16 - Generator AC Output Leads
Line T1 (red) to T2 (white) is protected against over­
load by a 30-amp circuit breaker (CBl). Use this
line-to-neutral
connection separately to operate
120-volt, single-phase, 60 Hertz, AC loads requiring
up to 3,600 watts (3.6 kW) of power. Line T3 (black)
to T2 (white) also is protected against overload by a
20-amp circuit breaker (CB2). IJse this line-to-neu-
tral 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.
A
------ Jk CAUTION Ü-----------
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 gen­
erator'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.
• 2.6.4 CONDUIT__________________________________
Route the connections between the generator and
the junction box through approved, flexible con­
duit. 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 gener­
ator 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.
30 Generac* Power Systems, Inc.