Product Manual

3. Installation3-2016

CAUTION

Installation debris can cause equipment failure and damage. Use extreme care to keep drill chips

and filings out of the relays, contacts, and other parts of the automatic transfer switch when

mounting or connecting conduit. Screwdrivers should be used carefully to prevent damage to

components.

When installing conduit, observe the following precautions:

1. The RA Series transfer switch includes cutouts on the bottom of the cabinet for wiring. If you decide

to drill your own holes in the top of the cabinet instead of using the cutouts provided, cover

the transfer switch to prevent accidental entry of metal chips before beginning conduit

installation.

2. If using rigid conduit between the generator set and the transfer switch, install at least 2 feet (610

mm) of flexible conduit between the rigid conduit and generator set to absorb vibration.

3. Run control circuit wiring in separate conduit from the AC wiring; otherwise, induced currents could

cause operational problems within the switch. Cutouts are available through the bottom of the

cabinet. Refer to the switch outline drawings included in Appendix C.

3.2.1 AC Connections

RA Series transfer switches are supplied with screw type terminals for the Utility, Generator, Load, and

Neutral power connections. Either copper or aluminum cables can be used for AC connections.

Connect the Utility, Generator, Load, and Neutral conductors to the clearly marked terminals on the

transfer switch. Use a wire brush to remove any surface oxides from the cables. Verify that all connections

are correct before tightening the lugs. All lug connections must be tightened to the proper torque values

listed in the tables below.

Perform wiring in the following sequence:

1. Test the operation of the generator set from its own controls.

WARNING

Failure to prevent the generator set from starting before wiring procedures are performed

presents a shock hazard that can cause severe personal injury or death. Disconnect

generator set battery, negative (-) terminal first, before proceeding.

2. Stop the generator set and remove the negative lead from the cranking battery to prevent starting.

WARNING

AC voltages and currents present an electrical shock hazard that can cause severe personal

injury or death. Make sure that both AC power sources are disconnected.

3. Make sure that both AC power sources are disconnected.

4. Connect power cables of sufficient size to carry rated current from the line, load, and generator

directly to the transfer switch terminals or circuit breaker(s), which are marked A and B. A neutral bar

is standard on the switches. For wire sizes and torque specifications, see the tables below.