8
OPM-109
REV A
WARNING:
Make sure the generator is disconnected from the battery to prevent
accidental starting.
The connection box shown are typical arrangements.
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.
The 225 Amp terminal block lugs will handle wire size #4 to 300 MCM
and should be torqued to 250 in. lbs.
B. GENERATOR CIRCUIT BREAKER:
This circuit breaker provides overload protection for the generator. Your
power feeds from the transfer switch 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 blockheater and the battery charger.
E: 120V/20 AMP DUPLEX RECEPTACLE:
This convenience receptacle is used to power both battery charge and
blockheater. This circuit must be fed from a GFCI fused circuit in the
distribution panel.
A.C. ELECTRICAL 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.
The block heater on this unit is a 750 watt heater can use the same
20 Amp GFCI fused circuit. This circuit will terminate on the 120
Volt terminal block mount in the customer connection cabinet. The
engine blockheater installed on this unit should also be plugged into
this receptacle. The block heater is thermostatically controlled when
plugged in will maintain the engine coolant temperature between 100
and 120 degrees F.
MOUNTING THE AUTOMATIC TRANSFER SWITCH
WARNING: FIRE HAZARD:
All wiring must be done by a licensed electrician, and must conform to
the National Electrical Code and comply with all the local codes and
regulations. Check with the local authorities before proceeding.
INSTALLATION NOTES:
Because of many different types of service, feeder and distribution
equipment, no specific wiring instructions can be provided. It is
recommended that only copper wire be used. In all cases it is
essential that while the load is connected to the generator, there can
be absolutely no feedback from the generator to the power line or the
power line to the generator. When properly installed, the normal ATS
Control and safety system will eliminate all paths and feedback.
To wire the automatic transfer switch into existing wiring, first determine
which circuits will be on the emergency load circuit. If the entire load is
transferred, the transfer switch can be wired directly after the watt-hour
meter and the service entrance, providing the service entrance ampere
rating is within the transfer switch’s rated capability.
If only specific circuits are to be powered under emergency power
failure conditions, an additional distribution panel designated
“emergency distribution panel” must be installed.
All selected emergency circuits are removed from main distribution
panels and installed in the emergency distribution panel. The ATS is
then installed between the main panel and the emergency distribution
panel. Suggested circuits: freezer, refrigerator, furnace, emergency
lights, sump pump, emergency outlet circuits, etc. Total running load
must not exceed generator rating.
