TP-6836 4/1420 Section 2 Installation
Install and test the power cables. Leave s ufficient
slack in the power leads to reach all of the power
connecting lugs on the power switching device. Test the
power conductors before connecting them to the
transfer switch. Installing power cables in conduit, cable
troughs and ceiling-suspended hangers often requires
considerable force. Pulling cables can damage
insulation and stretch or break the conductor’s strands.
Connect the cables. Be careful when stripping
insulation from the cables; avoid nicking or ringing the
conductor. 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 wiring diagram provided with the switch.
The connection points on the contactor are labeled
Normal, Emergency, and Load. Be sure to follow the
phase markings (A, B, C, and N). For single-phase
systems, connect to A and C.
Note: Connect the source and load phases as
indicated by the markings and drawings to
prevent short circuits and to prevent phase-
sensitive load devices from malfunctioning or
operating in reverse.
Verify that all connections are consistent with drawings
before tightening the lugs. Tighten all cable lug
connections to the torque values shown in Figure 2-7.
Bus connections. For bus connections, use SAE
grade 5 hardware to connect the bus to the terminal
plates on the bypass switching device. Wipe off the bus
surfaces before connecting. Use a non-flammable
solvent to clean the surfaces if they are dirty.
Note: For a reliable connection, the joint must be clean
and tight.
Use a compression washer, flat washer, and a minimum
grade 5 bolt. Torque the connections to the values in
Figure 2-8.
Socket Size
Across Flat
Torque
in. lb. ft. lb. Nm
1/8 45 4 5.1
5/32 100 8 11.3
3/16 120 10 13.6
7/32 150 12 17.0
1/4 200 17 22.6
5/16 275 23 31.1
3/8 375 31 42.3
1/2 500 42 56.5
9/16 600 50 67.8
Figure 2-7 Tightening Torque for Lugs
Bolt
Size
Torque Bolt (Grade 5)
in. lb. ft. lb. Nm
1/4-20 72 6 8.1
5/16-18 132 11 14.9
3/8-16 300 25 33.9
1/2-13 720 60 81.4
Figure 2-8 Tightening Torque for Bus Bars
2.7.2 Generator Engine Start
Connection
Accidental starting.
Can cause severe injury or death.
Disconnect the battery cables before
working on the generator set.
Remove the negative (--) lead first
when disconnecting the battery.
Reconnect the negative (--) lead last
when reconnecting the battery.
WARNING
Disabling the generator set. Accidental starting can
cause severe injury or death. Before working on the
generator set or equipment connected to the set, disable the
generator set as follows: (1) Press the generator set off/reset
button to shut down the generator set. (2) Disconnect the
power to the battery charger, if equipped. (3) Remove the
battery cables, negative (--) lead first. Reconnect the negative
(--) lead last when reconnecting the battery. Follow these
precautions to prevent the starting of the generator set by the
remote start/stop switch.
Making line or auxiliary connections. Hazardous voltage
can cause severe injury or death. To prevent electrical
shock deenergize the normal power source before making any
line or auxiliary connections.
Prevent the generator set from starting by pressing the
OFF button on the generator controller; disconnecting
power to the generator engine start battery charger, if
installed; and disconnecting all generator engine start
battery cables, negative (--) leads first.
Connect the generator set remote starting circuit to the
engine start connections. The generator start s ignal
connections are located on a terminal block on the
transfer switch contactor. See Figure 2-9 through
Figure 2-11. The terminal block location is marked by a
decal inside the enclosure.
Engine Start Contacts
Contact Rating 10 A @ 32 VDC
To Next Page
Loading...
