Equipment Secured to Grounded Metal Supports

The structural metal frame of a building can be used as the required equipment grounding conductor for AC equipment.

a) True
b) False

See answer and applicable Code reference

The correct answer is: b) False

Part VII of Art. 250 focuses on the methods of equipment grounding. As per Sec. 250.136(A), "Electrical equipment secured to and in electrical contact with a metal rack or structure provided for its support and connected to an equipment grounding conductor by one of the means indicated in 250.134. The structural metal frame of a building shall not be used as the required equipment grounding conductor for AC equipment."

 

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