SECTION
1
INSTALLATION
ASCO automatic transfer switches are factory wired and
tested. Field installation simply requires mounting and
connection of service cables, engine start signal wires, and
auxiliary control circuits
(if
required).
Mounting
Composite Outline and Mounting Diagrams
are furnished at
the back of this manual. T he diagrams shows all mount
ing details and instructions.
WARNING:
Protect the switch from construc
tion grit and metal chips to prevent malfunc
tion or shortened life for the switch.
Mount the automatic transfer switch vertically to a rigid
supporting structure. Level all mounting points by using
flat washers behind the holes to avoid forced distortion of
the switch.
Mount open-type
260-400
amp transfer switches on
the supplied insulator backing piece. It must be in
stalled behind the transfer switch. See Figure
1-1.
WARNING:
Be sure to install the insulator
piece behind
260-400
amp transfer switches.
insulator
backing
Figure
1-1.
Insulator for 260-400 amp switches.
Enclosed switches have the control panel mounted on the
cabinet door. For customer furnished enclosures (open
type switches), mount the control panel to the right of the
transfer switch, preferably on the inside surface of the en
closure door. Do not exceed the length of the harness;
provide stress relief where required.
An
add-on panel may be provided for certain optional ac
cessories. It is mounted below the control panel. For
open-type switches only, the control panel and add-on
1-1
panel are usually supplied on mounting rails. Refer to the
Composite Outline and Mounting Diagrams
for details.
Line Connections
Composite Elementary Wiring Diagrams
are furnished at
the back of this manual. All wiring must be made in ac
cordance with the National Electrical Code and local
codes.
A
DANGER:
De-energize the conductors
before making any line or auxiliary circuitry
connections. Be sure that Normal and Emer
gency line connections are in proper phase ro
tation. Also place the engine generator start
ing control in the off position. Make sure the
engine generator is not in operation.
Three cable spacers are included with
150
ampere
transfer switches. When installing power cables, run
the cables through the cable spacers as shown in Fig
ure
1-2.
Position the cable spacers within
1 112
inches
from the terminal lugs.
CAUTION: The cable spacers must be located
as
shown for
150
amp switches.
1 1/2""
approximate
cable spacer
Figure 1 -2. Cable spacer for 1 50 amp switch.
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:
1/2"
minimum for
30-400
amps,
1"
mini
mum over
400
amps.
It is not necessary to remove the barriers from the transfer
switch.
If
you do remove the them, however, reinstall
them carefully.
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