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Wednesday, June 2, 2021
Question:
Greetings,
Concerning the March 30, 2021 question about multiwire branch circuits needing to be fed by a two or three pole breaker, or breakers with handle ties, I believe the NEC does not apply to existing installations. If the original circuits were installed per code they are not required to be changed when new NEC rules are created.
Ed Crownhart
A
Answer:
Hello Ed,
You are correct. The NEC is not a retroactive Code, unless it states so in any of its rules. Be advised that local inspection jurisdictions may manage existing installations a bot differently that the minimum requirements of the NEC. Thanks for the note.