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