Section 1 — General Information
RTS “W” Type 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 carefully 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. The manufacturer reserves the right to change, alter or otherwise improve the product at any time without prior notice.
1.2EQUIPMENT DESCRIPTION
The automatic transfer switch is used for transferring critical electrical loads from a UTILITY (NORMAL) power source to an EMERGENCY (GNERATOR) power source.
The transfer switch prevents electrical feedback between the UTILITY and EMERGENCY sources. For that reason, electrical codes require a transfer switch in all standby electric system installations.
When the transfer switch is connected to the engine generator control panel, the control panel constantly monitors the UTILITY voltage and controls the opera- tion of the transfer switch.
1.3TRANSFER SWITCH DATA LABEL
A DATA LABEL is permanently affixed to the transfer switch enclosure. Use this transfer switch only with the specific limits shown on the DATA LABEL and on other decals and labels that may be affixed to the switch. This will prevent damage to equipment and property.
When requesting information or ordering parts for this equipment, make sure to include all information from the DATA LABEL.
Record the Model and Serial numbers in the space provided below for future reference.
MODEL #
SERIAL #
1.4TRANSFER SWITCH ENCLOSURE
The standard switch enclosure is a National Electrical Manufacturer’s Association (NEMA) and UL 3R type. UL and NEMA 3R type enclosures primarily provide a degree of protection against falling rain and sleet; undamaged by the formation of ice on the enclosure.
Should the UTILITY voltage drop below a preset value, and remain at this low voltage for a preset amount of time, the generator cranks and starts. After the gen- erator starts, the transfer switch transfers the load circuits to the generator, the generator then supplies the loads. When UTILITY returns above a preset level the load is transferred back to the UTILITY and the generator shuts down.
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 equip- ment. The manufacturer recommends a copy of the SAFETY RULES are made and posted near the trans- fer switch. Also, be sure to read all instructions and information found on tags, labels and decals affixed to the equipment.
Two publications that outline the safe use of transfer switches are the following:
•NFPA 70; National Electrical Code
•UL 1008, STANDARD FOR SAFETY-AUTOMATIC TRANSFER SWITCHES
NOTE:
It is essential to use the latest version of any stan- dard to ensure correct and current information.
2