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What are the torque requirements for QO circuit breaker wire binding screws and clamp plates?

Issue:
What are the torque requirements for QO / QOB wire binding screws and clamp plates?

Product Line:
Circuit Breakers

Environment:
QO and QOB circuit breakers

Resolution:
The following table shows the torque value requirements for the wire binding screws and clamp plates of QO and QOB circuit breakers.

 
QO Breaker Binding Screw Torque Summary
Type Description and AIC Rating Torque lb.-in (N-m)
QO/QOB 10A - 30A, 1,2 and 3-pole, all interruption ratings 36 (4)
QO/QOB 35 - 70A, 1, 2 pole and 40 - 60A 3-pole, 10kA  45 (5)
QO/QOB-VH, QOH 40 - 125A, 2-pole, 22kA & 42kA 50 (5.6)
QO/QOB-VH, 40 - 100A, 3-pole, 22kA 50 (5.6)
QO/QOB 70 - 100A, 3-pole, 10kA 50 (5.6)
QO/QOB-H 40 - 100A, 2-pole 240Vac 50 (5.6)
QO/QOB, 80 - 125A, 2-pole, 10kA 50 (5.6)
QO Tandem (Ex: QO2020, QOT1515...) 25 (2.8)


For information on wire sizes allowed on QO breakers click here.
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