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IB140015EN
Instructional Booklet
Page
18
Effective: August 2014
ATC-900 Magnum Tranfer Switch O & M Manual
Figure 21. Cable Bracing Instructions.
Tighten the cable lugs to the torque identified on the label affixed
to the door.
Proceed with the following steps:
Step 1:
Verify that the line and load cables comply with applica-
ble electrical codes.
Step 2:
Verify that the transfer switch rated current and voltage
(see identification plate on the door of the transfer
switch) agree with system current and voltage.
Step 3:
After the transfer switch is mounted, provide the conduit
or cable openings as required. Ensure that no metal filings
contaminate the transfer switch components.
Step 4:
Test all power cables before connecting them to the unit
to insure that the conductors or the cable insulation have
not been damaged while being pulled into position.
Step 5:
Carefully strip the insulation from the power cables.
Avoid nicking or ringing of the conductor strands. Pre-
pare the stripped conductor termination end by cleaning
it with a wire brush. If aluminum conductors are used,
apply an appropriate joint compound to the clean conduc-
tor surface area. Refer to Figure 13 for the approximate
locations of the power connections.
Table 5. Wire Size for Available Power Cable
Connections.
Step 6:
Make the necessary connections of any options using the
wiring diagrams supplied with the unit.
Step 7:
Connect the engine start wires to the Red Terminal blocks
for S2 Generator Start located in the bottom panel.
CAUTION
IMPROPER POWER CABLE CONNECTIONS CAN CAUSE EXCESSIVE
HEAT AND SUBSEQUENT EQUIPMENT FAILURE.
DEVICE
SWITCH
RATING
(AMPS)
CABLES
PER
PHASE
RANGE
WIRING SIZE
Switch
800-2000
6
3/0-750 MCM
Switch
2500-3200
9
3/0-750 MCM
Switch
4000
10
3/0-750 MCM
Switch
5000
12
3/0-750 MCM
Neutral
800-2000
24
4/0-500 MCM
Neutral
2500-3200
36
4/0-500 MCM
Neutral
4000
48
4/0-500 MCM
Neutral
5000
48
4/0-500 MCM
