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SECTION 1 INSTALLATION
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A SCO 7000 Series A utomatic Closed–Transition Trans-
fer Switches (ACTSs) are factory wired and tested. Field
installation requires mounting and connection of service
cables, and auxiliary control circuits (if required).
Remove the Shipping Skid (large ACTSs)
For large ACTSs, open the front door and remove t he
four lagscrews(2 in front, 2in 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 drawingincluded with the switchfor allmounting
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 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 applicable enclosure outline drawi ng fur-
nished with this switch and mount the automatictransfer
switch according to details a nd instructions s hown on
diagram.
Line Connections
Refer to the Wiring Diagram provided with the switch.
All wiring must be made in accordance with the National
Electrical Code and local codes.
It is unnecessary to remove pole covers fromthe 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.
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
often requires considerable force. The pulling of cables
can damage insulation and stretch or break the conduc-
tor’s strands. For this reason, after the cables are pulled
into position, and before
they areconnected, theyshould
betestedtoverify thatthey arenotdefectiveor havebeen
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
Afterthepowercableshave beentested, connect themto
the appropriate terminal lugs on the transfer switch as
shown on the wiring diagram provided wit h the switch.
Make sure the lugs provided are suitable for use with the
cables being installed. Standard terminal lugs are solder-
lessscrewtypeandwillacceptthewiresizeslistedonthe
drawings provided with the switch. Be careful when
stripping insulation from the cables; avoi d 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 ratinglabel.
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 e nclosure 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).