Product Manual

ManualsBrandsCummins Power ManualsGenerator AccessoriesCummins Automatic Transfer Switch — 400 Amps, 120/240 Volts, Single-Phase

3 Installation

3.1 Installation - Mounting

3.1.1 Introduction

Proper storage, installation, operation, and maintenance helps to increase the life of the transfer switch.

Installation is to be done only by licensed certified electricians.

WARNING

AC power within the cabinet presents a shock hazard that can cause severe personal injury or

death. Incorrect installation, service, or parts replacement can result in severe personal injury,

death, and/or equipment damage. All corrective service procedures must be done only by

technically trained and experienced personnel.

Each RA series transfer switch is factory wired and tested. Installation of the RA transfer switch includes

the following.

• Mounting a transfer switch cabinet

• Connection of all Utility, Generator, and Load cables (covered in Section 3.2)

• Connection of low voltage signal circuits (covered in Section 3.2.2)

RA Series transfer switches are only designed to be installed with the generator models identified

in Section 2.1. Installing this switch with any other generator model will void the warranty.

3.1.2 Equipment Inspection and Storage

Once you have received the transfer switch, inspect it for any damage. Check for damage to the

enclosure, the transfer switch, the control panel (if applicable), and the wiring harness.

Prior to installation, make sure the transfer switch is stored in a clean dry place, protected from dirt and

water. Provide ample air circulation and heat, if necessary, to prevent condensation from gathering on the

equipment. Be sure to adhere to the transfer switch storage and operating requirements listed below.

TABLE 2. TRANSFER SWITCH STORAGE AND OPERATING REQUIREMENTS

Model Storage Temperature

Operating Temperature

(Ambient)

Humidity

RA112N3,

RA212N3,

RA112S3, and

RA212S3

-22 °F to +158 °F

(-30 °C to +70 °C)

-4 °F to +140 °F

(-20 °C to +60 °C)

5% to 95%

(Non-Condensing)

RA412N3 and

RA412S3

-13 °F to +131 °F

(-25 °C to +55 °C)

-4 °F to +122 °F

(-20 °C to +50 °C)

Up to 90%

at 68 °F (20 °C)

3.1.3 Location

The location of the transfer switch in the existing electrical circuit varies with the application and the type

of entrance switch. The location and wiring must comply with the contract drawings.

There must be a service disconnect in the commercial power line ahead of the transfer switch.