IB01602008E For more information visit: www.eaton.com
Instructional Booklet
Effective: March 2014 Page 25
ATC-300 Breaker Based Transfer Switch
TO HELP PREVENT COMPONENT DAMAGE OR FUTURE MALFUNC-
TIONS, USE EXTREME CARE TO KEEP CONTAMINANTS OUT OF THE
ATS EQUIPMENT WHEN MAKING POWER CABLE CONNECTIONS.
RUN THE POWER CABLE THROUGH THE GUTTER SPACE PROVIDED
TO THE RIGHT OF POWER PANEL. DO NOT ROUTE THE POWER
CABLES BEHIND OR TO THE LEFT OF THE POWER PANEL. RUNNING
THE CABLES BEHIND OR TO THE LEFT OF THE POWER PANEL COULD
INTERFERE WITH THE PROPER OPERATION OF THE TRANSFER
SWITCH.
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 Booklet 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 5.
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.
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 5. Transfer Switch Equipment Wire Sizes
4.6 Wiring
POWER CONDUCTORS AND CONTROL WIRING MAY HAVE VOLTAGE
PRESENT THAT CAN CAUSE SEVERE PERSONAL INJURY OR DEATH.
DEENERGIZE ALL POWER OR CONTROL CIRCUIT CONDUCTORS
BEFORE BEGINNING TO PERFORM ANY WIRING ACTIVITY TO OR
WITHIN THE ATS EQUIPMENT.
Power sources, load conductors, and control wiring should be
connected to locations as indicated in the Customer Wiring Book-
let supplied with the ATS equipment.
ENSURE THE ATS VOLTAGE IS SET CORRECTLY. IT SHOULD BE THE
SAME AS THE SOURCE 1 AND SOURCE 2 LINE VOLTAGES. OPERAT-
ING THE EQUIPMENT ON IMPROPER VOLTAGE CAN CAUSE EQUIP-
MENT DAMAGE.
Once the ATS equipment has been installed and wired, perform
the initial mechanical and electrical procedures as outlined in Sec-
tion 6 to verify that the equipment is installed and operating prop-
erly.
REMEMBER TO REATTACH THE SOLID STEEL POWER PANEL SHIELD
TO THE RATCHET ASSEMBLY AFTER COMPLETING ANY OF THE PRO-
CEDURES DESCRIBED IN THIS SECTION.
CAUTION
CAUTION
WARNING
WARNING
CAUTION
NOTICE
TRANSFER SWITCH AMPERE RATING WIRE SIZE RANGES NUMBER OF CABLES PER PHASE TERMINAL TEMPERATURE RATING °C (°F)
30-100 #14-3/0 1 75 (167)
150 #6-300KCMIL 1 75 (167)
225-300 #3-350KCMIL 1 75 (167)
400 #3-350KCMIL 2 75 (167)
600 (3P) #1-500KCMIL 2 75 (167)
600 (4P) 3/0-400KCMIL 3 75 (167)
800-1200 3/0-500KCMIL 4 75 (167)
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