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IB140036EN
Instruction Booklet
Page
16
Effective: October 2014
O&M Manual for 40-1200A (480/600 Vac) ATC-900 3-Position,
Open/Closed Transition Contactor Based Transfer Switch
4.5 Power Cable Connections
WARNING
POWER CONDUCTORS MAY HAVE VOLTAGE PRESENT THAT CAN
CAUSE SEVERE PERSONAL INJURY OR DEATH. DE-ENERGIZE ALL
POWER OR CONTROL CIRCUIT CONDUCTORS TO BE CONNECTED
TO THE ATS EQUIPMENT BEFORE BEGINNING TO WORK WITH THE
CONDUCTORS AND/OR TERMINATING THEM TO THE EQUIPMENT.
CAUTION
USE OF CABLE LUGS NOT DESIGNED FOR THE ATS MAY CAUSE
HEATING PROBLEMS.
CAUTION
TO HELP PREVENT COMPONENT DAMAGE OR FUTURE MALFUNC-
TIONS, USE EXTREME CARE TO KEEP CONTAMINANTS OUT OF
THE ATS EQUIPMENT WHEN MAKING POWER CABLE CONNEC-
TIONS.
CAUTION
RUN THE POWER CABLE THROUGH THE GUTTER SPACE PROVIDED
IN THE REAR OF POWER PANEL.
Test all power cables prior to connection to the unit to ensure
that the conductors or cable insulation have not been damaged
while being pulled into position.
Power cables are to be connected to solderless screw type lugs
located on the ATS switching devices. Refer to the separate cus-
tomer wiring diagram supplied with the ATS equipment for power
termination. Verify that the lugs supplied will accommodate the
power cables being used. Also verify that the cables comply with
local electrical codes. Standard ATS equipment, as supplied from
the factory, will accommodate the wire sizes shown in Table 4.
Carefully strip the insulation from the power cables to avoid nick-
ing or ringing of the conductor strands. Prepare the stripped con-
ductor termination end by cleaning it with a wire brush. If
aluminum conductors are used, apply an appropriate joint com-
pound to the clean conductor surface area.
Wrap line cables together with nominal 3/8 inch nylon rope or
rope having tensile strength of 2,000 pounds.
Wrap at 4 inches and 15 inches from the line terminals with 8
and 18 wraps respectively or every 1 inch with 1 wrap.
Repeat the above for the load cables.
Figure 12. Cable Bracing Instructions.
WARNING
IMPROPER POWER CABLE CONNECTIONS CAN CAUSE EXCESSIVE
HEAT AND SUBSEQUENT EQUIPMENT FAILURE.
Tighten the cable lugs to the torque identified on the label affixed
to the door of the unit.
Table 4. Transfer Switch Equipment Wire Sizes
TRANSFER SWITCH AMPERE RATING
WIRE SIZE RANGES
NUMBER OF CABLES PER PHASE
TERMINAL TEMPERATURE RATING °C (°F)
100
#14-3/0
1
90 (194)
200
#6-300KCMIL
1
90 (194)
400
#1/0-750KCMIL
1
90 (194)
400
#1/0-250KCMIL
2
90 (194)
1200
#1/0-750KCMIL
4
90 (194)
* Cable must be 90C rated but size shall be determined based on the ampacity of the wire rated at 75C.
