A grounding electrode at a separate building or structure shall be required where one multiwire branch circuit serves the building or structure.
a) True
b) False
See answer and applicable Code reference
The correct answer is: b) False
The grounding and bonding rules for buildings or structures supplied by a feeder(s) or branch circuit(s) can be found in Sec. 250.32 of the 2011 NEC. As noted in the Exception in 250.32(A), "A grounding electrode shall not be required where only a single branch circuit, including a multiwire branch circuit, supplies the building or structure and the branch circuit includes an equipment grounding conductor for grounding the normally non-current-carrying metal parts of equipment."