Question 8011 of 749 · Maryland Journeyperson Electrician Exam
What is the maximum rating of an inverse time breaker used as motor branch-circuit short-circuit and ground-fault protection for a standard squirrel cage motor?
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Correct answer to question 8011
- A: 250 percent of full-load current
Explanation
Table 430.52 sets inverse time breakers at a maximum of 250 percent of the table full-load current for single-phase and polyphase squirrel cage motors other than wound-rotor and dc motors. The high value allows the breaker to ride through starting current.
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