12
OPM-134/B
AC CONNECTIONS
NOTICE: CLASS 1 WIRING METHODS
ARE TO BE USED FOR ALL FIELD WIRING
CONNECTIONS TO TERMINALS OF A CLASS 2
CIRCUIT
All wiring must be completed in accordance with the
National Electric Code as well as any state and local codes.
You must pay particular attention to wire size requirement
for the amperage of service you are dealing with. The table
below provides you guidance on wire sizing based on
both wire type and amperage. Wire amperages have been
derated for 40° C ambient temperatures operation.
WARNING
Make sure the generator is disconnected from the
battery to prevent accidental starting.
Typical arrangements for 45 and 65kW Circuit Breaker Box.
Typical arrangements for 90kW Circuit Breaker Box
A. NEUTRAL LUGS:
These lugs are isolated from ground and provided for you
to connect your neutral wire from the transfer switch to the
generator.
B. GENERATOR CIRCUIT BREAKER:
This circuit breaker provides overload protection for the
generator. Your power feeds from the transfer switch
A
E
B
C
D
A
E
C
D
B
will connect the bottom lugs on the circuit breaker. The
generator power feeds have already been wired into the
upper lugs.
Please refer to the circuit breaker installed on your unit for
breaker lug capacities and proper toque specifications.
To select the proper conductor size between the generator
and the ATS, first look your model up in Table 1 of Appendix
“A” for your generator amperage, found further in this
manual. Then refer to Appendix “2” for guidance on wire
sizing based on both wire type and amperage.
For additional information on wire sizes, refer to table 310-
16 of the National Electrical Code ANSI/NFPA 70.
C. GROUND LUG:
These ground lugs are bonded to ground and are provided
for you to connect your ground wire from the transfer
switch to. The lugs will accommodate #10 AWG to 2/0
AWG and should be torqued to 200 in. lbs.
D: 120V GFCI CIRCUIT TERMINAL BLOCK:
These terminals are rated for 85 Amps and will handle wire
sizes #4 AWG to 18AWG. They should be torqued to 16
in. lbs. This circuit must be fed from a fused circuit in the
distribution panel and provides power for the block heater
and the battery charger.
E: NEUTRAL TO GROUND LEAD LUG:
This lug is provided on the neutral terminal block to allow
you to run a neutral to ground lead if you are using the
generator in a stand alone application. This would be an
application where there is not a distribution panel and
no other ground to neutral bond in the wiring system. If
a grounding wire is attached here, remove the floating
neutral label in the panel. This will not be used when you
are wiring a generator and transfer switch into an existing
power system.
WARNING
A mainline circuit breaker has been provided inside
the generator housing. During all wiring installations,
make sure the breaker is in the OFF position and the
generator operating switch is in the OFF position.
WARNING: EQUIPMENT DAMAGE
When installing a three-phase 240 Volt system, be sure
you know which lead is the high voltage “wild” leg (208
Volt line to neutral). The generator normally carries the
high voltage on the G2 lead.
All wires should be installed in rigid or flexible conduit
(knockouts are provided in the control box).
