Emerson 7000 manual Installation

SECTION 1 INSTALLATION

The ASCO 7000 Series Automatic Transfer Switch (ATS) is factory wired and tested. Field installation requires mounting, connecting service cables, and connecting engine start and auxiliary control circuits (if required).

Supporting Foundation

The supporting foundation for the enclosure must be level and straight. Refer to the applicable enclosure outline drawing included with the switch for all mounting details including door opening space.

If bottom cable entry is used, the foundation must be prepared so that the conduit stubs are located correctly. Refer to the enclosure outline drawing for specified area and location. Provide cable bending space and ½ inch minimum clearance to live metal parts. When a concrete floor is poured, use interlocking conduit spacer caps or a wood or metal template to maintain proper conduit alignment.

Mounting

Refer to the Outline and Mounting Diagram provided with the ATS; it shows all mounting details and instructions.

Protect the switch from construction grit and metal chips to prevent malfunction or shortened life of the automatic switch switch.

Mount the ASCO ATS vertically to a rigid supporting structure. Level all mounting points by using flat washers behind the holes to avoid distortion of the switch.

The controller is mounted on the cabinet door. An add-on DIN rail is provided for some optional accesso- ries and is mounted below the controller on the door.

Line Connections

A Wiring Diagram is furnished with the ASCO 7000 Series ATS (separate from this manual). Refer to this drawing. All wiring must be made in accordance with the National Electrical Code and local codes.

often requires considerable force. The pulling of cables can damage insulation and stretch or break the conductor’s strands. For this reason, after the cables are pulled into position, and before they are connected, they should be tested to verify that they are not defective or have been damaged during installation.

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 the switch. 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 switch. 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.

Three cable spacers are included with 150, 200, & 230 A transfer switches. When installing power cables, run the cables through the cable spacers as shown in Figure 1-1.

Position the cable spacers within 1½ inches from the lugs.

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

cable spacers

1 ½ inch approximate

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.

Testing Power Conductors

Do not connect the power conductors to the transfer switch until they are tested. Installing power cables in conduit, cable troughs and ceiling-suspended hangers

cable spacer

Figure 1-1. Cable spacer for 150, 200, and 230 amp.

transfer switches.

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.

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