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INSTALLATION (continued)
1 --- 2
De–energize the conductors before making any
line or auxiliary circui try connections. Be sure
that Normal and E mergency line connecti ons
are i n proper phase rotation. Place engine gen-
erator starting control in the OFF position. Make
sure engine generator i s not in operation.
Testing Power Conductors
Do not connect the power conductors to the ATB until
they are t ested. Installing power cables in conduit,
cable troughs, and ceiling-suspended hangers often
requires considerable force. The pulli ng 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.
Protect the switch from construction grit
and metal chips to prevent malfunction or
shortened l ife of the 7ATB switch.
Connecting Power Conductors
A Wiring Diagram is furnished with the ATB. All
wiring must be made in accordance with the local
codes. After the power cables have been tested,
connect them to the appropriate terminal lugs o n the
Bypass Switch as shown on the wiring diagram
provided with this ATB. Make sure that the lugs
providedaresuitableforusewiththecablesbeing
installed. Standard terminal lugs are solderless screw
type and will accept the wire sizes listed on the
drawi ngs provided with the ATB. B e careful when
stripping insulation from conductors; avoid nicking or
ringing the conductor. Remove surface o xides from
conductors by cleaning with a wire brush. Follow
conductor manufacturer’s instructions when aluminum
conductor is used. Apply joint compound to conductor,
then carefully wipe away excess compound. Tighten
the cable lugs to the torque specified on the rating
label.
Be sure that the Normal and Emergency power
connections are in proper phase rotation.
Bus Connections
If bus connectio n is used, use SAE grade 5 hardware to
connect bus to appropriate terminal plates on bypass
switching device. Wipe off bus surfaces before they are
joined. If bus is dirty, gently clean surfaces with a
non-flammable solvent. Avoid touching cleaned
surfaces.
Do not breathe cleaning solvent vapors.
UseSAEgrade5hardwareandtightenthebolted
joints to the torque speci fied in Table 2-1.
The reliability o f the connection depends
on how clean and how tight the joint is.
Table 2-1. Tightening torque values for bolted joints.
Bolt Diameter
(Grade 5 hardware)
in inches
Recommended
Tightening Torque
in foot pounds
5/16 12
3/8 20
1/2 50
5/8 95
Harnesses
All internal connections are made at the factory. The
bypass switch, transfer switch, and control panel are
joined together by an interconnecting wire harness.
The disconnect plugs are already engaged on enclosed
switches. For open–type switches, the plugs must be
engaged after installation is completed. Align harness
plugs with sockets in the control and push them
together until they are secure.
Engine Starting Contacts
and Auxiliary Circuits
The engine control contact si gnal connections and
auxiliary circuits are located on terminal block TB as
shownontheWirin g Diagram provided with the ATB.
Connect the signal wires to the appropria te terminals.