IB140058EN
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Instructional Booklet
Effective: March 2016
Page
15
O&M Manual for 30-1000 Amperes
Manual Transfer Switch
4.5 Power Cable Connections
Proceed with the following steps:
Step 1:
Verify that the line and load cables comply with applica-
ble 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 sur-
face area. Refer to Figure 14 for approximate locations of
power connections.
Power cables are to be connected to solder-less 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 5.
Table 5. Transfer Switch Equipment Wire Sizes
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 dia-
grams and Quick Start Guide supplied with the unit.
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 ANDTHE BUS BAR BEHIND THE BREAKER. FOR
INSTALLATION INSTRUCTIONS, REFER TO THE INSTRUCTION LEAF-
LET SUPPLIED FOR THE SPECIFIC LUGS.
CAUTION
TO HELP PREVENT COMPONENT DAMAGE OR FUTURE MALFUNC-
TIONS, USE EXTREME CARE TO KEEP CONTAM- INANTS OUT OF
THE TRANSFER SWITCH EQUIPMENT WHEN MAKING POWER
CABLE CONNECTIONS.
TRANSFER SWITCH
AMPERE RATING
WIRE SIZE
RANGES
NUMBER OF
CABLES PER PHASE
30-100
150
225-300
#14-3/0
#6-300KCMIL
#3-350KCMIL
1
1
1
400
600 (3Pole)
600 (4Pole)
#4/0-300KCMIL
#1-500KCMIL
3/0-400KCMIL
1
2
3
800
1000
4/0-500KCMIL
4/0-500KCMIL
4
4
CAUTION
IMPROPER POWER CABLE CONNECTIONS CAN CAUSE EXCESSIVE
HEAT AND SUBSEQUENT EQUIPMENT FAILURE.
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 RECOM-
MENDED COULD INTERFERE WITH THE PROPER OPERATION OF THE
TRANSFER SWITCH.
NOTICE
REMEMBER TO RE-ATTACH THE SOLID STEEL POWER PANEL DEAD-
FRONT SHIELD TO THE RATCHET ASSEMBLY ON THE VERTICAL
DESIGN AFTER COMPLETING ANY OF THE PROCEDURES
DESCRIBED IN THIS SECTION.
