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Illustrated Changes to the NEC, 2002 Edition - Part 1

Article 210

Branch Circuits

210.7 Branch Circuit Receptacle Requirements

New text clarifies the requirement for simultaneously disconnecting the ungrounded branch circuit conductors.

(C) Multiple Branch Circuits. Where more than one branch circuit supplies more than one receptacle on the same yoke, a means at the branch circuit panelboard must be provided to simultaneously disconnect the ungrounded (hot) circuit conductors supplying the receptacles. Figure 210–1

Author’s Comment: Single-pole breakers with approved handle ties, or a multipole breaker (2 or 3-pole) can be used to simultaneously disconnect the ungrounded circuit conductors.
Intent: The intent is to require all ungrounded (hot) circuit conductors terminating on multiple receptacles (duplex) on the same yoke to be disconnected simultaneously regardless of type of occupancy. This rule is intended to prevent persons from unintentionally working on energized circuits that they thought were disconnected. The 1999 NEC only required the circuit disconnect to simultaneously interrupt the multiwire circuit to multiple receptacles on the same yoke if the receptacle was located in a dwelling unit.
Author’s Comment: It was not the intent of this rule to apply to multiwire branch circuits, because a multiwire branch circuit is considered as one circuit [100]. However, many will take the opportunity to apply this rule to multiwire circuits.

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