Operator`s manual

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 wit h the Series 300 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 bendingspace 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 Series 300 according
to details and instructions shown on diagram.
Protect the switch from construction grit
and metal chips to prevent malfunction or
shortened life of the automatic switch switch.
!
Mount the ASCO ATS vertically to a rigid supporting
structure. Level all mounting points by using flat washers
behind the holes to avoid distortion of the switch.
Transfer switches rated 225, 260, and 400 amp. 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 t ransfer swi tch. 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 gen-
erator starting control in the OFF position. Make
sure engine generator is not in operation.
It is not necessary to remove the barriers f rom the transfer
switches to install cables.
Be sure that the insulator piece is behind
225, 260, and 400 ampere transfer switches.
!
insulator
backing
piece
Figure 1-1. Insulator for 225, 260, & 400 amp.
E–design transfer switches.
The controller is mounted on the cabinet door. An add-on
DIN rail i s provided for some optional accessories 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 i nsulation 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 t he 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 solder-
less screw type and will accept the wire sizes listed on the
drawings provided with the Series 300. 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 the switch. Maintain proper
electrical clearance between the live metal parts and
grounded metal: ½ inch minimum.