Introduction, Equipment Description | Generac 4678-1, 9227-2

Section 1 — General Information

Generac 100 Amp Transfer Switch

1.1INTRODUCTION

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.

1.2EQUIPMENT 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.

1.3TRANSFER 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.

1.4TRANSFER 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.

1.5SAFE 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

2 Generac® Power Systems, Inc.