Winco ULPSS21/A WITH DSE 7310 ENGINE CONTROL - Manual (Page 9)

60706-227 Page 7 2090-00
To wire the automatic transfer switch into the existing wiring, first
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 en-
trance, 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 distribu-
tion panels and installed in the emergency distribution panel. The
A.T.S. is then installed between the main panel and the emer-
gency 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
Note: This symbol always indicates ground where
used.
INSTALLERS NOTE: To access the AC and DC inter-
connections 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 connec-
tion are behind this panel.
A - Neutral Lugs, These 100 amp neutral lugs are isolated from
ground and provided for you to connect your neutral wire to from
the transfer switch. The lugs will accommodate #12 AWG to #1/0
awg and should be torqued to 50 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.
The table below gives you the circuit breaker size, lug wire sizes
and torque specification. (see the actual breaker for additional
information and restrictions)
kW Voltage PH Amp Wire Capability Lug Torque
21 120/240 1 89.0 #12 AWG -2/0 AWG 50 in lbs
22 120/208 3 76.4 #12 AWG -2/0 AWG 50 in lbs
22 120/240 3 66.2 #12 AWG -2/0 AWG 50 in lbs
25 277/480 3 37.6 #14 - #1/0 AWG 80 in lbs
Minimum Conductor Sizes between the Generator and the ATS.
Based on wire type and temperature rating. Wire has been
derated for 40
o C ambient temperatures.
Cu Conductor Al Conductor
C/B Wire Temperature Rating
kW Voltage PH Amp 75 0 C 90 0 C 75 0 C 90 0 C
21 120/240 1 90 #2 AWG #3 AWG 1/0 AWG #2 AWG
22 120/208 3 70 #3 AWG #4 AWG #2 AWG #3 AWG
22 120/240 3 70 #4 AWG #4 AWG #2 AWG #3 AWG
25 277/480 3 35 #8 AWG #8 AWG #8 AWG #8 AWG
For additional information on wire sizing 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 to from the
transfer switch. The lugs will accommodate #6 AWG to 250 MCM
and should be torqued to 250 in. lbs.
D. 120 Volt Terminal Block, This terminal block is provided for
the 120 volt/ 15 amp feed from customer's distribution panel for
the block heater and the trickle charger.
****************
***** WARNING *****
****************
A main line circuit breaker has been provided inside the genera-
tor housing. During all wiring installations make sure the breaker
is in the off position and the generator operation 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.
The load current carrying wires (L) and (T) must be sized to
handle the maximum load current without excessive voltage drop.
By code, the wire must be heavy enough to handle the full current
rating of the main line circuit-breaker (or fuse) in the entrance (or
sub-panel) protecting the contactor switch.
All wires should be installed in rigid or flexible conduit. (Knock-
outs are provided in the control box).