Installation | Emerson 381333230 guide

SECTION 1 INSTALLATION

ASCO 386 Non–Automatic Transfer Switches are factory wired and tested. Installation requires skid removal then securing the enclosure to the supporting foundation.

Mounting

Refer to the applicable enclosure outline drawing fur- nished with this switch and mount the Series 300 according to details and instructions shown on diagram.

Line Connections

Refer to the Wiring Diagram provided with your ASCO 386 N–ATS. All wiring must be made in accordance with the National Electrical Code and local codes.

It is unnecessary to remove pole covers from the transfer switch. If you do remove them, reinstall them carefully.

De–energize the conductors before making any line or auxiliary circuitry connections. Be sure that Normal and Emergency line connections are in proper phase rotation. Place engine gen- erator starting control in the OFF position. Make sure engine generator is not in operation.

Three cable spacers are included with 150, 200, and 230 ampere transfer switches. When installing power cables, run the cables through the cable spacers as shown in Figure 1–1. Position cable spacers within 1½ inches from lugs.

The cable spacers must be located as shown for 150, 200, and 230 ampere transfer switches.

cable spacers

1 ½ inch approximate

cable spacer

Figure 1–1. Cable spacers for 150, 200, & 230 amp.

transfer switches.

Protect the non–automatic transfer switch from construction grit and metal chips to prevent malfunction or shortened life of the N–ATS.

Connecting Power Conductors

After the power cables have been tested, connect them to the appropriate terminal lugs on the transfer switch as shown on the wiring diagram provided with this ASCO

386.Make sure the lugs provided are suitable for use with the cables being installed. Standard terminal lugs are solderless screw type and will accept the wire sizes listed on the drawings provided with the ASCO 386. Be careful when stripping insulation from the cables; avoid nicking or ringing the conductor. Remove surface oxides from cables by cleaning with a wire brush. When aluminum cable is used, apply joint compound to conductors. Tighten cable lugs to the torque specified on rating label.

Controller Ground

A grounding wire must be connected to the controller’s lower left mounting stud. Because the controller is mounted on the enclosure door, a conductive strap must be used between the enclosure and the door. This connection provides proper grounding which does not rely upon the door hinges.

Harnesses

The transfer switch is connected to the left side of the controller by a plug–in harness (two plugs).

Auxiliary Circuits

Connect auxiliary circuit wires to appropriate terminals on transfer switch as shown on the wiring diagram provided with this ASCO 386 Non–Automatic Transfer Switch.

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