10
4300-00
60706-244
To wire the automatic transfer switch into the existing wiring, fi rst
determine which circuits will be on the emergency load circuit.
If the entire load is to be transferred, the transfer switch can
be wired in 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 specifi c 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 A.T.S. 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.
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
INSTALLERS NOTE: To access the AC and DC
interconnections on this unit, open the single door
on the right hand side of the units. Then remove the
safety panel covering the mainline circuit breaker. All
connection are behind this panel.
A- Neutral Lugs, These neutral lugs are isolated from ground
and provided for you to connect your neutral wire from the
transfer switch to. These lugs will handle wire sizes #3/0 AWG to
500 MCM and should be torqued to 300 in. lbs.
B - Generator Circuit Breaker, This circuit breaker provides
overload protection for the generator. Your power feeds from
the transfer switch will connect to 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 torque specifi cations.
To select the proper conductor size between the Generator
and the ATS, fi rst look your model up in Table below for your
generator amperage. Then refer to the table on page 23 for
guidance on wire sizing based on both wire type and amperage.
Wire amperages have been derated for 40
o
C ambient
temperatures operation.
GR150P4 on NG
kW
Voltage
PH
C/B Amperage
150
120/240
1
600
150
120/208
3
600
150
120/240
3
600
150
277/480
3
225
GR150P4 on LP
kW
Voltage
PH
C/B Amperage
125
120/240
1
600
125
120/208
3
450
125
120/240
3
450
125
277/480
3
225
For additional information on wire sizing refer to table 310-15 (B)
(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. These lugs will handle wire sizes #1 AWG to
300 MCM and should be torqued to 250 in. lbs.
D. 120 Volt Terminal Block, This terminal block is provide for
the 120 volt/ 15 amp feed from customers distrubution panel for
the block heater and the trickle charger.
E - 120 VOLT/20 AMP DUPLEX RECEPTACLE, This
convenience receptacle is used on the small units to plug in both
the small fl oat charger as well as the blockheater. On some of
the units with the larger block heater you will have to wire directly
into the terminal block.
F - 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 no distribution panel and no other ground to neutral
bond in the wiring system. If a grounding wire is attached here
remove the fl oating neutral label in the panel. This will not be
used when you are wiring a generator and transfer switch
into an existing power system.