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O & M Manual for the CHGENLC Automatic
Transfer Switch with ATC-100 Control
7.4.1.7 Replacing the 100 A Lugs
UTILITY
LUGS
Figure 37. Replacing the 100 A Lugs.
Note: If you are replacing the lugs in a 100A SE ATS, the service entrance
breaker must be removed first. Also jumpers between the generator
breaker (inside ATS) and the E1, E2 terminals on the generator (Source 2)
side of the contactor must be removed. Follow Steps 1 through 4 in Sec-
tion 7.4.1.9 (for 100A & 200A Service Entrance breaker) and steps 3 & 4
in Section 7.4.1.10 (for 100A & 200A generator breaker).
Step 1: Turn the utility (Source 1) power off and turn the genera-
tor (Source 2) control selector switch to the "OFF" posi-
tion before attempting to replace the service entrance
breaker.
Step 2: Disconnect all wire cables from the contactor.
Step 3: Note their location then disconnect the red wires from the
contactor (see Figure 32).
Note: All wires connected to the contactor are labeled to ease
identification.
For SE ATSs only
Step 4: Remove the hardware securing the utility bus extensions
to the contactor and SE Breaker. Remove the utility bus
extension (see Figure 38).
IB00405002E
GENERATOR LUGS
LOAD LUGS
For more information visit: www.eaton.com
Effective: August 2007
Figure 38. Utility Bus Extension on a 100 A SE ATS.
For All ATSs
Step 5: Remove the four (4) screws securing the contactor to the
base plate using a blade screwdriver or 0.25 in. socket or
nut driver.
Step 6: Remove the two (2) generator lugs and the two (2) load
lugs using a blade screwdriver (see Figure 37).
For SE ATSs, Skip This Step.
Step 7: Once the load lugs have been removed, insert a blade
screwdriver up through the circular hole in the load lug
bus and remove screws securing the two (2) generator
lugs.
For SE switch, skip this step.
Step 8: Place the new utility lugs on the utility bus so the anti-
turn protrusions fit in the holes. Once the lugs are in
place, take one (1) supplied control wire terminal and
hold it underneath the bus. Using one (1) screw and one
(1) washer supplied, tighten the control wire terminal
and lug to the utility bus. Repeat the process of the sec-
ond utility lug. Ensure that no gaps are present between
the lugs and bus.
Step 9: Place the new generator lugs on the generator bus.
Once the lugs are in place, take one (1) supplied control
wire terminal and hold it underneath the bus. Using one
(1) screw and one (1) washer supplied, tighten the con-
trol wire terminal and lug to the generator bus. Repeat
the process of the second generator lug. Ensure that no
gaps are present between the lugs and bus.
Step 10 Secure the load lugs to the load bus using the hardware
supplied.
Note: The load lugs do not require control wire terminals.
Step 11: Secure the contactor to the base plate using the four (4)
screws supplied.
For SE ATSs
Step 12: Align the utility lug extension with the SE breaker and
contactor. Secure the utility bus extension to the SE
breaker and contactor using the original hardware (see
Figure 38).
Instructional Booklet
Page 27
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