NFPA 70 National Electrical Code 2023 Article 700 Emergency Systems
Part IV: Emergency system circuits for lighting and power – NFPA 70 National Electrical Code 2023 Article 700 Emergency Systems

NFPA 70 National Electrical Code 2023 Article 700 Emergency Systems 700.19: 700.19 Multiwire branch circuits

A branch circuit for emergency lighting or power may not share a neutral with others as part of a multiwire circuit.

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