RDT Transfer Switch Manual

TP-6345 9/13 17Section 2 Installation
Conduit. Use the knock-outs provided in the enclosure
for cables. Use separate conduit for AC power wiring
and low-voltage DC, control, and communication
system wiring. Watertight conduit hubs may be required
for outdoor use.
For the SE model conduit hub, thread sealant must be
applied to screw threads if screws are removed or
replaced.
Select the proper cable clamp or use other approved
methods for securing the cable or conduit to the
enclosure.
Connect the source and load cables. Clean cables
with a wire brush to remove surface oxides before
connecting them to the terminals. Apply joint compound
to the connections of any aluminum conductors.
Refer to the connection diagrams on the transfer switch
enclosure door (see Figure 2-3) and the wiring
diagrams in Section 7.
Connect the Normal source (typically the utility power) to
the lugs labeled NA and NB. Connect the Emergency
source (typically the generator set) to the lugs labeled
EA and EB.
For service entrance models, connect the utility source
to the lugs on the normal source disconnect circuit
breaker as shown in the service entrance switch wiring
diagram in Section 7.
On models without built-in load centers, connect the
load to the lugs labeled LA and LB.
On models with built-in load centers, the LA and LB lugs
are factory-wired to the load center. Connect the load
leads to the circuits in the load center and tighten the
connections. Check the labels on the breakers for the
tightening torques.
Connect the neutral from the main panel to the neutral
lug in the ATS enclosure.
Note: The neutral connection is required for transfer
switch operation.
Ground the system according to NEC and local codes.
Verify that all connections are consistent with drawings
before tightening the lugs. Tighten all cable lug
connections to the torque values shown on the label on
the switch. Carefully wipe off any excess joint
compound after tightening the terminal lugs.
2.5.3 Neutral Bonding Jumper, Service
Entrance Models
Service entrance transfer switches are shipped with the
neutral-to-ground jumper connected. For non-service
entrance applications, disconnect the neutral-to-ground
bonding jumper. See the transfer switch dimension
drawing.