What would be the rating of an inverse-time circuit breaker required for the branch circuit serving...
What would be the rating of an inverse-time circuit breaker required for the branch circuit serving three motors with a conductor size of 150A? What would be the rating of a dual-element fuse?
Homework Answers
Conductors are sized as 125% of the full load current.
Thus full load current/continuous load current = 150/1.25 = 120
Amperes.
Inverse time circuit breaker are permitted to have the capacity of
250% of the motor full-load current.
Thus, the rating of Inverse-time circuit breaker = 2.5 x 120 = 300
A
And, the dual element fuse are permitted to be of 175% of the motor
full-load current = 1.75 x 120 = 210 A
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What would be the rating of an inverse-time circuit breaker
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