TP-6807 12/11 17Section 2 Installation
2.5.2 AC Power Connections
Determine the cable size. Refer to Figure 2-8 or the
ADV drawings in Section 6 to determine the cable size
required for the transfer switch. Make sure the lugs
provided are suitable for use with the cables being
installed.
Conduit. 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.
Select the proper cable clamp or use other approved
methods for securing the cable or conduit to the
enclosure.
Source and load connections. 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 and the wiring diagrams in Section 6.
The connection points on the transfer switch contactor
are labelled Normal, Emergency, and Load. Connect
the utility power to Normal. Connect the generator set to
Emergency.
Single phase. For single-phase models, connect to A
and C.
Three phase. For three-phase models, be sure to
follow the phase markings (A, B, C, and N).
Note: Connect the source and load phases as indicated
by the markings and drawings to prevent short
circuits and to prevent phase-sensitive devices
from malfunctioning or operating in reverse.
Service entrance models. Connect the utility source to
the lugs on the normal source disconnect circuit
breakers as shown in the service entrance switch wiring
diagram in Section 6.
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.
On models with built-in load centers, the load 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.
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