Installation - Emerson ASCO 7000 Series Operator's Manual

ASCO 7000 Series Automatic 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 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
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 drawing fur-
nished with this switch and mount the automatic transfer
switch according to details and instructions shown 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 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.
SECTION 1

INSTALLATION

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 are connected, they should
be tested to verify that they are not defective or have been
damaged during installation.
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 solder-
less 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.
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.
The transfer switch is connected to the left side of the
controller by a plug–in harness (two plugs).
1---1
Testing Power Conductors
!
Protect the automatic transfer switch from
construction grit and metal chips to prevent
malfunction or shortened life of the ATS.
Connecting Power Conductors
Controller Ground
Harnesses