TP-6126 8/02
10
Section 2 Installation
2.5.1
AC Power Connections
Determine the cable size.
Refer to the table in
Figure 2-15 to determine the cable size and number of
cables required for the transfer switch. Make sure the
lugs provided are suitable for use with the cables being
installed. Watertight conduit hubs may be required for
outdoor use.
Note:
Use only copper wire for 200 amp models.
UL-Listed Solderless Screw-Type Terminals
for External Power Connections
Normal, Emergency, and Load Terminals
Switch
Rating
(Amps)
Maximum Number of
Cables per Pole
Range of Wire Sizes,
Copper or Aluminum
30, 70, 104
1
#14 AWG to 2/0 AWG
150
1
#8 AWG to 3/0 AWG
200
1
#8 AWG to 3/0 AWG
(use copper wire only)
225 400
1
#4 AWG to 600 MCM
225--400
2
#1/0 AWG to 250 MCM
600
3
#2 AWG to 600 MCM
800--1200
4
#1/0 AWG to 750 MCM
1600--2000
6
#1/0 AWG to 750 MCM
2600--3000
12
#1/0 AWG to 750 MCM
4000
Bus Bar
Figure 2-15
Cable Sizes
NOTICE
Foreign material contamination.
Cover the transfer switch
during installation to keep dirt, grit, metal drill chips, and other
debris out of the components. Cover the solenoid mechanism
during installation. After installation, use the manual operating
handle to cycle the contactor to verify that it operates freely.
Do not use a screwdriver to force the contactor mechanism.
Drill the entry holes.
Cover the transfer switch to
protect it from metal chips and construction grit. Then
drill entry holes for the conductors at the locations
shown on the enclosure drawings. Remove debris from
the enclosure with a vacuum cleaner.
Do not use
compressed air to clean the switch because it can cause
debris to lodge in the components and cause damage.
Install and test the power cables.
Leave sufficient
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.
Test the cables after pulling them into position and
before
they are connected to verify that they are not
defective and that they were not damaged during
installation.
Install the cable spacers provided with 30--200 amp
switches as shown in Figure 2-16. On 225--400 amp
switches, verify that the factory-installed insulator
backing piece shown in Figure 2-17 is in place behind
the contactor.
1
127
1. Cable spacers
1 ½ inch approximate
1
Figure 2-16
Cable Spacers for 30--200 Amp Switches
1
127
1. Insulator backing piece
2. Contactor
Figure 2-17
Insulator for 225--400 Amp Switches
