7. Electrical Connections
7-1
GENERAL
Installing the genset electrical system includes con-
necting the load, remote control (if used), and con-
necting the battery. The battery should always be
connected last to avoid accidental starting or short
circuiting the unit during installation. Connect the
negative (-) battery cable last to reduce the risk of
arcing.
WARNING
Accidental starting of the generator
set while working on it can cause severe per-
sonal injury or death. Do not connect the start-
ing battery until instructed to in the
Installation
Checks and Start-Up
section.
All wiring must meet applicable local electrical
codes. For this reason, a qualified electrician
should install and inspect the wiring.
Mount switches and controls securely to prevent
damage from vibration and road shock. All switches
must be vibration-proof to prevent accidental open-
ing or closing while the vehicle is in motion.
Do not run wiring where it may contact sharp, rough,
or hot surfaces or where it may become kinked,
pinched, or chaffed.
AC WIRING
Wiring Methods
Wiring methods must be in accordance with appli-
cable codes, such as the National Electrical Code
(NFPA No. 70).
Use stranded wire for all load connections. Load
wiring must be appropriately sized and insulated for
the specified current rating. Grounding procedure
must comply with codes.
Line Circuit Breaker
The genset has line circuit breakers mounted on the
side of the control panel. The breakers provide
short circuit and overload protection for the genera-
tor.
Genset Rating
The generator output voltage and maximum current
rating are specified on the generator nameplate.
Conduit
Install the generator load conductors supplied with
the genset in a flexible metallic conduit. Cut the con-
duit to the desired length, leaving extra wire as re-
quired for the junction box (connecting wires must
be appropriately sized and insulated for the speci-
fied current rating). Prepare the ends of the conduit,
to prevent its sharp edges from cutting the wire in-
sulation.
Run the conduit in such a way as not to interfere with
the movement of the set.
Use waterproof conduit whenever conduit is ex-
posed to the elements.
Be sure to seal all openings made for wiring so ex-
haust or fuel vapor cannot enter the living quarters.
If flexible metal conduit is used, it must be sealed in-
ternally at the end where it terminates within the
junction box or panel board. Flexible conduit is not
vapor tight along its length due to it unique construc-
tion.
WARNING
Exhaust gas and fuel fumes present
the hazard of severe personal injury or death. To
prevent exhaust gas and fuel fumes from enter-
ing the vehicle interior, seal all opening made
for conduit, wiring, etc. Also seal the wiring
within the conduit itself. Use a silicone/rubber-
based sealant.
Wiring Disconnect Method
There must be no possibility of the outside power
source being connected to the genset. The feeder
conductors from the genset compartment must ter-
minate in a 120-volt, 2- or 3-pole, double-throw,
positive-off switching device mounted ahead of the
vehicle distribution panel; or must connect to a gen-
erator set receptacle box. Refer to Figures 7-1
through 7-3 on Pages 7-3 and 7-4 for examples
of the wire connections.
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