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2 Generac
®
Power Systems, Inc.
Section 1 — General Information
Generac 100 Amp Transfer Switch
1.1 INTRODUCTION
This manual has been prepared especially for the
purpose of familiarizing personnel with the design,
application, installation, operation and servicing of
the applicable equipment. Read the manual careful-
ly and comply with all instructions. This will help to
prevent accidents or damage to equipment that might
otherwise be caused by carelessness, incorrect appli-
cation, or improper procedures.
Every effort has been expended to make sure that the
contents of this manual are both accurate and cur-
rent. Generac, however, reserves the right to change,
alter or otherwise improve the product at any time
without prior notice.
1.2 EQUIPMENT DESCRIPTION
The pre-packaged transfer switch is designed to use
with pre-packaged standby generator control panels.
It is used for transferring critical electrical loads
from a NORMAL (utility) power source. Such a trans-
fer of loads occurs automatically when the NORMAL
power source fails or is subsequently reduced and
the STANDBY source voltage and frequency have
reached an acceptable level. The transfer switch pre-
vents electrical feedback between two different power
sources (such as the NORMAL and STANDBY
sources) and, for that reason, codes require it in all
standby electric system installations.
Once the transfer is completed, the STANDBY power
source then powers electrical loads connected to the
transfer switch. When NORMAL source voltage
above an acceptable (preset) level has been restored,
voltage sensor action in the pre-packaged control
panel initiates re-transfer back to NORMAL power
source. After this re-transfer, the controller signals
to open the start circuit to the generator, which shuts
down the engine. The controller is then “armed” and
ready for the next drop in NORMAL source voltage.
NOTE: Keep in mind the pre-packaged transfer
switch is without any kind of electronic controls. It
receives signals solely from the controller contained
in the pre-packaged control panel.
1.3 TRANSFER SWITCH RATINGS
DECAL
Affixed to the transfer switch door is a RATINGS
DECAL. Use the transfer switch only within the specif-
ic limits shown on the RATINGS DECAL and on other
decals and labels that may be affixed to the switch.
This prevents damage to equipment and possible
injury to personnel, and provides long and trouble-free
life for the equipment.
When requesting information or ordering parts for this
equipment, make sure to include all information from
the RATINGS DECAL.
1.4 TRANSFER SWITCH ENCLOSURE
The standard switch enclosure is a National
Electrical Manufacturer’s Association (NEMA) 1 type.
NEMA 1 type enclosures primarily provide protection
against contact with the enclosed equipment and
against a limited amount of falling dirt.
1.5 SAFE USE OF TRANSFER SWITCH
Before installing, operating or servicing this equip-
ment, read the SAFETY RULES (inside front cover)
carefully. Comply strictly with all SAFETY RULES to
prevent accidents and/or damage to the equipment.
Generac recommends you make a copy of the SAFE-
TY RULES and post them near the transfer switch.
Also, be sure to read all instructions and information
you may find on tags, labels and decals affixed to the
equipment.
Two publications that outline the safe use of transfer
switches are the following:
• National Electrical Code
• UL 1008, STANDARD FOR SAFETY-AUTOMATIC
TRANSFER SWITCHES