I find letter definitions for everything except the (B), example... TYPE NM-B. NM= Non-Metalic. What does the "B" indicate?
1 Answer
The NM means "non-metallic sheathed", not simply "non-metallic". The 'B' is simply a revision letter, indicating the mandated upgrade to the conductors' temperature ratings implemented in 1984.
answered Sep 10, 2021 at 16:24
