Romex (NM-B Cable)

Category: infrastructure

The trade name for non-metallic sheathed electrical wire used for interior residential branch circuits.

NM-B cable bundles insulated hot and neutral copper conductors alongside a bare ground wire inside a protective polyvinyl chloride outer jacket. It is rated exclusively for dry, indoor structural environments and is categorized by wire gauge (e.g., 14/2 or 12/3) to match specific breaker currents.

Common Examples

• We pulled a fresh run of 12/2 Romex cable through the wall studs to support the new kitchen appliance circuit installation.
• Romex cable must be securely fastened to wall framing studs within twelve inches of every junction box container structure.