Rating of Supply Conductors for X-Ray Equipment

The ampacity of supply branch-circuit conductors and the overcurrent protective devices for X-ray equipment shall not be less than _____.

a) 50% of the momentary rating
b) 100% of the long-term rating
c) the larger of a or b
d) the smaller of a or b

See answer and applicable Code reference

The correct answer is: c) the larger of a or b

Article 660 covers all X-ray equipment operating at any frequency or voltage for industrial or other nonmedical or nondental use. As noted in Sec. 660.6(A), "The ampacity of supply branch-circuit conductors and the overcurrent protective devices shall not be less than 50% of the momentary rating or 100% of the long-term rating, whichever is greater."

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