Can a dedicated (individual) branch circuit share a neutral with other circuits in a multiwire branch circuit according to the NEC?

Can a dedicated (individual) branch circuit share a neutral with other circuits in a multiwire branch circuit according to the NEC?

• A. False
• B. True
• C. Only under certain conditions
• D. Not allowed for any circumstance

Answer: (B)

In a multiwire branch circuit, two or more ungrounded conductors share a single neutral. A circuit that’s intended as a dedicated branch can still be part of such an arrangement if there are multiple hot conductors sharing a neutral. The NEC focuses on how the conductors are connected and protected, not on the label “dedicated.” So yes, a dedicated branch circuit can share a neutral with other circuits as part of a multiwire branch circuit, provided the installation meets the safety requirements: the ungrounded conductors must be on opposite phases so the neutral carries only the unbalanced current, and all ungrounded conductors must have a simultaneous disconnect (common trip or handle-tied breakers). The neutral and conductors must be appropriately sized for the loads involved.

In a multiwire branch circuit, two or more ungrounded conductors share a single neutral. A circuit that’s intended as a dedicated branch can still be part of such an arrangement if there are multiple hot conductors sharing a neutral. The NEC focuses on how the conductors are connected and protected, not on the label “dedicated.”

So yes, a dedicated branch circuit can share a neutral with other circuits as part of a multiwire branch circuit, provided the installation meets the safety requirements: the ungrounded conductors must be on opposite phases so the neutral carries only the unbalanced current, and all ungrounded conductors must have a simultaneous disconnect (common trip or handle-tied breakers). The neutral and conductors must be appropriately sized for the loads involved.