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SECTION 1 INSTALLATION
1 --- 1
A SCO 7000 Series A utomatic Transfer Switches (ATSs)
are factory wired and tested. Field installation requires
requires mounting and connection of service cables,
and auxiliary control circuits (if required).
Remove the Shipping Skid (large ATSs)
For large ATSs, open t he front door and remove the
four lag screws (2 in front, 2 in rear) securing enclosure
to the wood skid.
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 de tails 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
spaceandclearancetolivemetalparts. Whena
concrete floor is poured, use interlocking conduit
spacer caps or a wood or metal template to maintain
proper conduit alignment.
Mounting
Refer to the applicable enclosure outline drawing
furnished with this switch and mount the automatic
transfer switch according to details and instructions
shownondiagram.
Line Connections
Refer to the Wiring Diagram provided with t he switch.
All wiring must be made in accordance with the
National Electrical Code and local codes.
It is not necessary to remove pole covers from the
transfer switch for cabling. 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 generator 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 t ransfer
switch until they are tested. Installing power cables in
conduit, cable troughs and ceiling-suspended hangers
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 tha t they are
not defective or have been damaged during
installation.
Protect the automatic transfer switch from
construction grit and metal chips to prevent
malfunction or shortened life of the 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 the
switch. Makesurethelugsprovidedaresuitablefor
use with the cables being insta lled. 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 nicki ng 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 t he
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).