WEG Molded Case Circuit Breakers - User’s Manual
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WEG Molded Case Circuit Breakers - User’s Manual
7
b. If the circuit breaker includes factory or field installed internal accessories,
make sure accessory wire is accessible when the circuit breaker is mounted.
Note: labels with accessory connection schematic diagrams are provided on the side of the circuit breaker.
c. Position the circuit breaker on the mounting surface.
d. Install circuit breaker mounting screws and washers. Tighten screws firmly,
but do not exceed 28 Ib.-in (3 N.m).
CAUTION
When aluminum conductors are used, the application of a suitable
joint compound is recommended to reduce the possibility of terminal
overheating. Over heating can caused nuisance tripping and damaged to
the circuit breaker.
7. Connect line and load conductors and accessory leads.
8. After the circuit breaker is installed, check all mounting hardware and terminal
connecting hardware for correct torque loading. Torque values for line/load
terminals are given in Table 2 and on the circuit breaker nameplate.
9. Install both the line and load terminal covers on the circuit breaker cover with
mounting screws provided. Torque to 20-22 Ib.in (2.26-2.49 N.m).
Terminal
catalog No.
Terminal
body
material
Screw
head
type
Wire
cable
range
Wire
type
Torque
value
(lb.-in)
LT1A1 UBW700
Aluminum
Socket
2 #I - 500 MCM
Al/Cu
375
LT1A UBW800
Aluminum
Socket
2 500 - 750 MCM
Al/Cu
500
Table 2:
terminal types
1)2)
Notes: 1) The maximum width non-standard wire connector (tang-type) or bus bar connector that can be used
without reducing electrical clearance and creepage distances between phases is 1.690 inches.
2) No hardware or connector should be installed in a manner to reduce the electrical clearance between the
underneath side of the phase termination (line or load) and ground without the addition of supplementary
insulation.
WARNING
Hazardous voltage conditions can cause death or severe personal injury.
Maintain original electrical clearance and creepage spacings at terminations.