User's Manual

SECTION 1 INSTALLATION
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ASCO Series 7000 Automatic Delayed–Transition
Transfer Switches are factory wired and tested. Field
installation simply requires mounting and connection of
service cables, and auxiliary control circuits (if required).
Remove the Shipping Skid
For large switches, 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 level
and straight. Refer to the applicable enclosure outline
drawing included with the ADTS for all mounting det ails
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 outline and mounting diagram provided with
the ADTS ; it s ho w s all moun tin g detail s and instru c tio n s .
Protect the switch from construction grit
and metal chips to prevent malfunction or
shortened life of the automatic switch switch.
Mount the ADTS 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 controller on the door.
Auxiliary Cable Boxes
For 1000 & 1200 amp. sizes, an auxilia ry cable box is
required for all (normal, emergency, & load)bottom or
top entry. Order ASCO part no. 609027 if required.
On 1000 & 1200 amp. be sure to install auxiliary
cable box if both service and load cables are en -
tering through the top or bottom of enclosure.
Line Connections
A Wiring Diagram is furnished with the ASCO Series
7000 ADTS (separate from this manual). Refer to this
drawing. All wiring must be made in accordance with
the National Electrical Code and local codes.
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 t he OFF position. Make
sure engine generator is not in operation.
Testing Power Conductors
Do not connect the power conductors t o 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.
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 insulati on 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.
Do not run cables in front of or behind the switch.
Cablescanbebundledontherightsideoftheswitch.
Maintain proper electrical clearance between the live
metal parts and grounded metal: ½ inch minimum for
150-400 amps, 1 inch minimum over 400 amps.
It is not necessary to remove the barriers from the
transfer switches to install the cables. If you do remove
them,however, be sure to reinstall the barriers carefully.
Bus Connections
For large switches use grade 5 hardware to connect bus
to appropriate terminal plates. Wipe off the bus surfaces
before they are joined. If the bus is very dirty, gently
clean t he surfaces with a non---flammable solvent. Avoid
touching the cleaned surfaces.
Do not breathe cleaning solvent vapors.