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SECTION 1 INSTALLATION
1 --- 1
Series 300 Automatic Transfer Switches are factory wired
and tested. Installation requires skid removal then secur-
ing the enclosure to the supporting foundation.
Supporting Foundation
The supporting foundation for the enclosure must be
level and straight. Refer to the applicable enclosure
outline drawing included with the Series 300 for all
mounting de tails 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 Series 300
according to details and instructions shown on diagram.
NOTICE
Protect the automatic transfer switch from
construction grit and metal chips to prevent
malfunction or shortened life of the ATS.
Mount the ATS vertically to a rigid supporting structure.
L evel all mounting points by using flat washers behind
the holes to avoid distortion of the switch.
Transfer switches rated 260 and 400 amperes are
mounted on an insulator backing piece (installed behind
the transfer switch). If the transfer switch is removed
from the cabinet and then reinstalled, this insulator
piece must be placed behind the transfer switch. See
Figure 1–1.
Line Connections
Refer to the Wiring Diagram provided with your Series
300 ATS. 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 generator
starting control i n the OFF position. Make sure
engine generator is not in operation.
It is not necessary to remove the barriers from the
transfer switches to install cables.
Be sure that the insulator piece is behind 260 and
400 ampere transfer switches.
insulator
backing
piece
Figure 1-1. Insulator backing piece for 260 and 400
ampere transfer switches.
The controller is mounted on the cabinet door. An
add-on DIN rail is provided for some optional accesso-
ries and is mounted below the controller on the door.
Testing Power Conductors
Do not connect the power conductors to the ASCO
Series 300 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,
afte r t he cables are pulled into position, and before
they
are connected, the y should be tested to verify that t hey
arenotdefectiveorhavebeendamagedduring
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 this Series
300. Make sure the lugs provided are suitable for use
with the cables being installed. Standard terminal lugs
are solderless screw t ype and will accept the wire sizes
listed on the drawings provided with the Series 300 ATS.
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.
Do not run cables behind the switch. Cables can be
bundled on the right side of t he switch. Maintain proper
electrical clearance between the live metal parts and
grounded metal: ½ inch minimum.