SECTION 1 INSTALLATION
1 --- 1
ASCO4000 Series Automatic Delay ed–TransitionTrans-
fer Switches are factorywired and tested. Field installa-
tion 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
fourlag screws (2 in front, 2 i n rear) securing enclosure to
the wood skid.

Supporting Foundation

The supportingfoundation for the enclosure must level
and straight. Refer to the applicable enclosureoutline
drawing included with the 4ADTS for all mounting
details including door opening space.
If bottom cable entry is used, the foundation must be
prepared sothat the conduit stubs are located correctly.
Referto the enclosure outlinedrawing for specifiedarea
andlocation. Providecable bendingspace and clearance
to live metalparts. When a concrete floor is poured, use
interlocking conduit spacer caps or a wood or metal
template to maintainproper conduit alignment.

Mounting

Referto the outline and mounting diagram provided with
the ATS;it shows all mounting details and instructions.
Protect theswitch from construction grit
and metal chips to prevent malfunction or
shortened life of the automa tics witch switch.
Mountthe ATS vertically to a rigidsupporting structure.
Levelall mounting point s by using flat washers behind the
holes to avoid distortion of the switch.
The controller is mounted on the cabinet door. Anadd-
onDIN rail is provided for some optional accessories and
is mounted below controller on the door.
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 PowerConductors

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’sstrands. For this reason, after the cables are
pulledinto 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

AWiringDiagram is furnished with the ASCO 4000 Series
4ADTS (separate from this manual). Refer to this
drawing. All wiring mustbe made in accordance with the
National ElectricalCode and local codes.
Afterthe power cables have been tested, connect them to
the appropriate terminal lugs on the transfer switchas
shown on the wiring diagram provided with the switch.
Make sure the lugsp rovided aresui table foruse wit hthe
cables being installed. Standard terminal lugs are solder-
lessscrewtypeandwillacceptthewiresizeslistedonthe
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 joi nt compound to conducto rs.
Tightencable lugs to the torque specifiedon rating label.
Donot run cables in frontof or behind the switch. Cables
can be bundledon the right side of the switch. Maintain
proper electricalclearance between the live metal parts
andgrounded metal: ½inch minimum for 150-400 amps,
1 inch minimumover 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

Forlarge switchesuse grade 5 hardware to connect bus to
appropriate terminal plates. Wipe off the bus surfaces
beforethey are joined. Ifthe bus is very dirty, gently clean
the surfaces with a non--- flammable solvent. Avoid
touching the cleaned surfaces.
Tighten boltedjoints to the torque specified in TableA.
The reliability of the connection depends
on how clean and how tightthe joint is.
TableA. Tightening torque values for bolted joints
(Grade 5 hardware)
Bolt Diameter
in inches
Tightening Torque
in foot pounds
1/4 7
5/16 12
3/8 20
1/2 50
5/8 95
3/4 155