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Section 2: General Information
Unpacking
Carefully unpack the transfer switch. Inspect closely for
any damage that might have occurred during shipment.
The purchaser must file with the carrier any claims for
loss or damage incurred while in transit. Verify that all
parts are included.
Verify that all packing material is completely removed
from the switch prior to installation.
Equipment Description
The automatic transfer switch is used for transferring
electrical load from a utility (normal) power source to a
generator (standby) power source. Such a transfer of
electrical loads occurs automatically when the utility
power source has failed or is substantially reduced and
the generator source voltage and frequency have
reached an acceptable level. The transfer switch pre-
vents electrical feedback between two different power
sources (such as the utility and generator sources) and,
for that reason, codes require it in all standby electric
system installations.
The transfer switch consists of a transfer mechanism,
utility service disconnect circuit breaker (if equipped), a
control relay, a Smart A/C module, fuses, terminal strip,
and fuse holder for connection of sensing wires.
This UL/CUL listed transfer switch has locking provisions
for the utility entry cabinet. In addition, it has a lockout/
tagout provision for the service entrance circuit breaker.
Transfer Switch Mechanism
See
Figure
2-1. These switches are used with a single-
phase system, when the single-phase neutral line is to be
connected to a neutral lug and is not to be switched.
Solderless, screw-type terminal lugs are standard.
The conductor size range is as follows:
Switch
Wire Range
Rating
(1) #4-600 MCM
(Cu/Al)
400A
or
(2) 1/0-250 MCM
(Cu/Al)
This transfer switch is suitable for control of motors, elec-
tric discharge lamps, tungsten filament and electric heat-
ing equipment where the sum of motor full load ampere
ratings and the ampere ratings of other loads do not
exceed the ampere rating of the switch and the tungsten
load does not exceed 30% of the switch rating.
This UL listed transfer switch is for use in optional
standby systems only (NEC article 702).
Automatic Transfer Switch Owner's Manual
Conductor
Torque Specification
375 in-lbs (42.4 Nm)
This transfer switch is suitable for use on a circuit
capable of 22,000 rms symmetrical amperes, 240 VAC
maximum.
Figure 2-1. Typical Single-Phase ATS Transfer
Mechanism
A
Utility Lugs (N1 & N2)
B
Generator Lugs (E1 & E2)
C
Load Lugs (T1 & T2)
Utility Service Circuit Breaker
The utility service circuit breaker is:
Generac, 400AF
•
120/240VAC, 400A
•
50/60 Hertz
•
Wire range: (1) #4-600 MCM or (2) 1/0-250 MCM
(Cu/Al)
•
The conductor torque specification is 375 in-lbs
(42.4 Nm).
General Information
A
B
000218
C
5
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