Product Manual

4
Solderless, screw-type terminal lugs are standard.
The conductor size range is as follows:
Switch Rating Wire Range
400A
(1) #4-600 MCM or
(2) 1/0-250 MCM
Conductor sizes must be adequate to handle the maximum cur-
rent to which they will be subjected; based on the 75°C column of
tables, charts, etc. used to size conductors. The installation must
comply fully with all applicable codes, standards and regulations.
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 conductors are used, apply corrosion inhibitor to
conductors. 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.
n
Use a torque wrench to tighten the conduc-
tors, being sure not to overtighten, or dam-
age to the switch base could occur. If under-
tightened, a loose connection would result,
causing excess heat which could damage
the switch base.
Connect power source load conductors to clearly marked transfer
mechanism terminal lugs as follows
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 terminals 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.
2.5 CONNECTING CONTROL
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.
2.6 AUXILIARY CONTACTS
If desired, there are Auxiliary Contacts on the transfer switch to
operate customer accessories, remote advisory lights, or remote
annunciator devices. A suitable power source must be connected
to the COMMON (C) terminal. See Figure 2.3.
Contact operation is shown in the following chart:
Switch Position
Utility Standby
Common to Normally Open Open Closed
Common to Normally Closed Closed Open
NOTE:
Auxiliary Contacts are rated 10 amps at 125 or 250 volts AC.
DO NOT EXCEED THE RATED VOLTAGE AND CURRENT OF THE
CONTACTS.
Figure 2.3 – Auxiliary Contacts
Side views shown in Utility position
Installation