Installation Operator’s Manual
381333-194 B 5
Installation
ASCO 7000 Series Automatic Transfer & Bypass–
Isolation Switches (7ACTBs) are factory wired and
tested. Field installation requires mounting and
connection of service cables, and auxiliary control
circuits (if required).
Remove the Shipping Skid
Open the enclosure’s lower front door and also remove
the lower rear access panel. Then remove the four lag
screws (2 in front, 2 in rear) securing the enclosure to
the shipping 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
furnished 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.
Do not remove the barrier from the transfer switch.
Always protect the transfer switch, bypass switch, and
isolation contacts and mechanisms from construction
grit and metal chips when cabling.
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 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
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.
Protect the switch from construction grit and metal
chips to prevent malfunction or shortened life of the
7ACTB switch.
Connecting Power Conductors
After the power cables have been tested, connect them
to the appropriate terminal lugs on the bypass 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 7ACTB. 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).
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