In multiwire branch circuits, the continuity of the _____ conductor shall not be dependent upon the device connections.
c) grounding electrode
d) a and b
See answer and applicable Code reference
The correct answer is: b) grounded
General wiring method requirements are outlined in Art. 300 of the 2011 NEC. Mechanical and electrical continuity rules for conductors are noted in Sec. 300.13. As specifically noted