IB01602007E
For more information visit: www.cutler-hammer.eaton.com
Instruction Bulletin
Effective: June 2003
Page
19
O&M Manual for
Non-Automatic Transfer
Switches (30 – 1200 Amperes)
4.5 Power Cable Connections
Proceed with the following steps:
Step 1: Verify that the line and load cables comply with
applicable electrical codes.
Step 2: Verify that transfer switch rated current and voltage
(see identification plate on the intelligence panel
of transfer switch) agree with system current
and voltage.
Step 3: After the transfer switch is mounted, provide
conduit or cable openings as required. Ensure that
no metal filings contaminate the transfer switch
components.
Step 4: Test all power cables before connecting to the unit
to ensure that conductors or cable insulation have
not been damaged while being pulled into position.
Step 5: Carefully strip insulation from the power cables.
Avoid nicking or ringing of the conductor strands.
Prepare the stripped conductor termination end
by cleaning it with a wire brush. If aluminum
conductors are used, apply an appropriate joint
compound to the clean conductor surface area.
Refer to Figure 14 for approximate locations of
power connections.
Power cables are to be connected to solderless screw type
lugs located on the transfer switch switching devices. Verify
that the lugs supplied will accommodate the power cables
being used. Also verify that the cables comply with local
electrical codes. Standard transfer switch equipment, as
supplied from the factory, will accommodate the wire sizes
shown in Table 4.
Step 6: Tighten cable lugs to the torque identified on
the label affixed to the unit immediately adjacent
to the lugs.
Step 7: Make necessary connections of options using
wiring diagrams and
Quick Start Guide
supplied
with the unit.
Table 4. Transfer Switch Equipment Wire Sizes
Remember to re-attach the solid steel power panel
deadfront shield to the ratchet assembly on the vertical
design after completing any of the procedures described
in this section.
WARNING
POWER CONDUCTORS MAY HAVE VOLTAGE PRESENT
THAT CAN CAUSE SEVERE PERSONAL INJURY OR DEATH.
DE-ENERGIZE ALL POWER OR CONTROL CIRCUIT CON-
DUCTORS TO BE CONNECTED TO THE TRANSFER
SWITCH EQUIPMENT BEFORE BEGINNING TO WORK
WITH THE CONDUCTORS AND/OR TERMINATING THEM
TO THE EQUIPMENT.
CAUTION
USE OF CABLE LUGS NOT DESIGNED FOR THE TRANSFER
SWITCH MAY CAUSE HEATING PROBLEMS. BREAKER
LUGS ONLY MOUNT TO THE BREAKER, WHILE TRANSFER
SWITCH LUGS MOUNT TO BOTH THE BREAKER AND
THE BUS BAR BEHIND THE BREAKER. FOR INSTALLATION
INSTRUCTIONS, REFER TO THE INSTRUCTION LEAFLET
SUPPLIED FOR THE SPECIFIC LUGS.
CAUTION
TO HELP PREVENT COMPONENT DAMAGE OR FUTURE
MALFUNCTIONS, USE EXTREME CARE TO KEEP CONTAM-
INANTS OUT OF THE TRANSFER SWITCH EQUIPMENT
WHEN MAKING POWER CABLE CONNECTIONS.
CAUTION
IMPROPER POWER CABLE CONNECTIONS CAN CAUSE
EXCESSIVE HEAT AND SUBSEQUENT EQUIPMENT FAILURE.
Transfer Switch
Ampere Rating
Wire Size
Range
Number of
Cables per Phase
300 – 100
150
150 – 300
#14 – 3/0
#6 – 300 kcmil
#3 – 350 kcmil
1
1
1
400
600 (3-Pole)
600 (4-Pole)
4/0 – 600 kcmil
#1 – 500 kcmil
3/0 – 400 kcmil
1
2
3
800
1000
4/0 – 500 kcmil
4/0 – 500 kcmil
4
4
CAUTION
DO NOT RUN POWER CABLES BEHIND OR TO THE LEFT
OF THE POWER PANEL. THE CABLES SHOULD BE RUN IN
THE GUTTER SPACE PROVIDED. RUNNING THE CABLES IN
PLACES NOT RECOMMENDED COULD INTERFERE WITH
THE PROPER OPERATION OF THE TRANSFER SWITCH.
NOTICE
