The Key To Successful Home Wiring: THHN Vs. Romex

NM-B-wire

Romex (NM-B) and THHN are the two most common cable types used in residential and commercial wiring. Confusingly, NM-B wire is not very different from THHN wire as far as construction is concerned.
THHN is a cable with a single thermoplastic high heat resistant nylon wire, while NM-B wire is a sheathed cable with multiple conductors.
The conductors within NM-B wire are either insulated or uninsulated, and the former is actually THHN, which often leads to confusion between the two types of cable.

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