518 has no influence on a grocery store or a 40 story building as a whole.

518 will keep NM out of the church assembly area it does not keep it out of the ancillary areas like bathrooms, offices, hallways, etc.

Yes 334.12(A)(1) has changed the rules for most, but being a MA resident that was amended so it is not a consideration for me. [Linked Image]

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Use romex for a 277/480v circuit?

NM is rated 600 volt for a reason and yes we use it.

I will admit I am not comfortable pushing a 12/3 out of the way with 480 volt, 3 phase live in it.

Bob

Bob Badger
Construction & Maintenance Electrician
Massachusetts