Connect power source load conductors to clearly marked transfer mechanism terminal lugs as fol-lows
1.
Connect UTILITY (NORMAL) power source cables to switch terminals N1, N2, N3.
2.
Connect EMERGENCY (STANDBY) source power cables to transfer switch terminals E1, E2, E3.
3. Connect customer LOAD leads to switch termi-nals T1, T2, T3.
4. Connect neutral conductors of UTILITY, EMERGENCY and customer LOAD to the neutral block.
Conductors must be properly supported, of approved insulative qualities, protected by approved conduit, and of the
correct wire gauge size in accordance with applicable codes.
Be sure to maintain proper electrical clearance between live metal parts and grounded metal. Allow at least
1/2 inch for 100-400 amp circuits.
CONNECTING START CIRCUIT WIRES
Control system interconnections consist of UTILITY 1 and 2, and leads 23 and 194. Control system interconnection leads
must be run in a conduit that is separate from the AC power lead. Recommended wire gauge sizes for this wiring
depends on the length of the wire, as recommended below:
MAXIMUM WIRE LENGTH RECOMMENDED WIRE
SIZE
460 feet (140m)
No. 18 AWG.
461 to 730 feet (223m)
No. 16 AWG.
731 to 1,160 feet (354m)
No. 14 AWG.
1,161 to 1,850 feet (565m)
No. 12 AWG.
PDU-ATS-100A-208Y.120-3PH
Larson Electronics, LLC
Phone: (800) 369-6671
Fax: (903) 498-3364
www.larsonelectronics.com
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of
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POWER
•
PDU-ATS-100A-208Y.120-3PH
is compatible with input voltages of
208Y/120 3PH
.
•
Power source and load connec-tions are made at a transfer mechanism, inside the switch enclosure.
Before connecting wiring cables to terminals, remove any surface oxides from the cable ends with a wire brush. All power
cables should enter the switch next to transfer mechanism terminals. If ALUMINUM con-ductors are used, apply corrosion
inhibitor to con-ductors. Tighten terminal lugs to the torque values as noted on the decal located on the inside of the door.
After tightening terminal lugs, carefully wipe away any excess corrosion inhibitor.
All power cables should enter the switch next to the transfer mechanism terminals.
AUXILIARY CONTACTS
If desired, there are Auxiliary Contacts on the transfer switch to
operate customer accessories, remote advi-sory lights, or remote
annunciator devices. A suitable power source must be connected to
the COMMON (C) terminal. See Figure 2.
Contact operation is shown in the following chart:
S
witch Po
s
ition
Utility
S
tandby
Common to Norm
a
lly Open
Open
Clo
s
ed
Common to Norm
a
lly Clo
s
ed
Clo
s
ed
Open
Optional
Auxiliary Contact
(Actuated)
Side views shown in Utility position
NOTE:
Auxiliary Contacts are rated 10 amps at 125 or
250 volts AC. DO NOT EXCEED THE RATED
VOLTAGE AND CURRENT OF THE CONTACTS.
