{"id":11900,"date":"2025-11-24T09:29:24","date_gmt":"2025-11-24T01:29:24","guid":{"rendered":"https:\/\/totcables.com\/?p=11900"},"modified":"2025-11-24T09:29:24","modified_gmt":"2025-11-24T01:29:24","slug":"what-does-nm-b-stand-for-understanding-nm-b-wire-and-romex-cable","status":"publish","type":"post","link":"https:\/\/totcables.com\/?p=11900","title":{"rendered":"What Does NM-B Stand For? Understanding NM-B Wire and Romex Cable"},"content":{"rendered":"

{“main-title”:{“component”:”hc_title”,”id”:”main-title”,”title”:””,”subtitle”:”NM-B stands for Non-Metallic sheathed cable, type B, where the B indicates the cable is rated for 90\u00b0C in dry locations. This designation identifies the most common electrical cable used in residential wiring\u2014what most people call Romex a brand name that has become synonymous with NM-B cable.”,”title_content”:{“component”:”hc_title_image”,”id”:”title-image”,”image”:”https:\/\/totcables.com\/wp-content\/uploads\/2025\/11\/what-does-the-b-stand-for-in-nm-b-wire.webp|380|800|11901″,”full_screen”:false,”full_screen_height”:””,”parallax”:false,”bleed”:””,”ken_burn”:””,”overlay”:”transparent-dark”,”breadcrumbs”:true,”white”:true,”position”:””}},”section_5ZtkF”:{“component”:”hc_section”,”id”:”section_5ZtkF”,”section_width”:””,”animation”:””,”animation_time”:””,”timeline_animation”:””,”timeline_delay”:””,”timeline_order”:””,”vertical_row”:””,”box_middle”:””,”css_classes”:””,”custom_css_classes”:””,”custom_css_styles”:””,”section_content”:[{“component”:”hc_column”,”id”:”column_vtfQF”,”column_width”:”col-md-12″,”animation”:””,”animation_time”:””,”timeline_animation”:””,”timeline_delay”:””,”timeline_order”:””,”css_classes”:””,”custom_css_classes”:””,”custom_css_styles”:””,”main_content”:[{“component”:”hc_wp_editor”,”id”:”Xhugf”,”css_classes”:””,”custom_css_classes”:””,”custom_css_styles”:””,”editor_content”:”NM-B stands for ‘Non-Metallic sheathed cable, type B,’ where the ‘B’ indicates the cable is rated for 90\u00b0C (194\u00b0F) in dry locations.<\/strong> This designation identifies the most common electrical cable used in residential wiring\u2014what most people call ‘Romex’ (a brand name that has become synonymous with NM-B cable).\\n\\n

what does the b stand for in nm-b wire

what does the b stand for in nm-b wire<\/p><\/div>\\n\\nIf you’ve ever looked at electrical wire and seen ‘NM-B’ printed on the jacket alongside size markings like ’14\/2′ or ’12\/2,’ you’re looking at the standard cable that powers outlets, lights, and appliances throughout millions of homes. In this guide, we’ll explain exactly what NM-B means, how it differs from older NM cable, and when it should (and shouldn’t) be used.\\n\\n<\/p>\n

\n

\\n\\n<\/p>\n

What Does NM-B Wire Mean?<\/h2>\n

\\nLet’s break down the NM-B meaning<\/strong> piece by piece:\\n<\/p>\n

NM-B Wire Meaning Explained<\/h3>\n

\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n
Component<\/th>\n

\\n<\/p>\n

What It Means<\/th>\n

\\n<\/tr>\n

\\n<\/thead>\n

\\n<\/p>\n

NM<\/strong><\/td>\n

\\n<\/p>\n

Non-Metallic sheathed cable<\/td>\n

\\n<\/tr>\n

\\n<\/p>\n

-B<\/strong><\/td>\n

\\n<\/p>\n

Type B designation (90\u00b0C rated)<\/td>\n

\\n<\/tr>\n

\\n<\/p>\n

Non-Metallic<\/strong><\/td>\n

\\n<\/p>\n

Outer jacket is plastic (PVC), not metal conduit<\/td>\n

\\n<\/tr>\n

\\n<\/p>\n

Sheathed<\/strong><\/td>\n

\\n<\/p>\n

Individual wires wrapped together in a protective outer jacket<\/td>\n

\\n<\/tr>\n

\\n<\/p>\n

Type B<\/strong><\/td>\n

\\n<\/p>\n

Modern standard with higher temperature rating<\/td>\n

\\n<\/tr>\n

\\n<\/tbody>\n

\\n<\/table>\n

\\n<\/p>\n

What Does ‘B’ Stand For in NM-B Wire?<\/h3>\n

\\nThe ‘B’ in NM-B stands for the second generation of non-metallic cable<\/strong> with improved temperature ratings. Here’s the evolution:\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n
Type<\/th>\n

\\n<\/p>\n

Temperature Rating<\/th>\n

\\n<\/p>\n

Status<\/th>\n

\\n<\/tr>\n

\\n<\/thead>\n

\\n<\/p>\n

NM<\/strong> (original)<\/td>\n

\\n<\/p>\n

60\u00b0C (140\u00b0F)<\/td>\n

\\n<\/p>\n

Obsolete, replaced in 1984<\/td>\n

\\n<\/tr>\n

\\n<\/p>\n

NM-B<\/strong><\/td>\n

\\n<\/p>\n

90\u00b0C (194\u00b0F)<\/td>\n

\\n<\/p>\n

Current standard since 1984<\/td>\n

\\n<\/tr>\n

\\n<\/p>\n

NM-C<\/strong><\/td>\n

\\n<\/p>\n

Does not exist<\/td>\n

\\n<\/p>\n

Not a real designation<\/td>\n

\\n<\/tr>\n

\\n<\/tbody>\n

\\n<\/table>\n

\\nImportant<\/strong>: While NM-B is rated for 90\u00b0C conductor temperature, the ampacity<\/strong> (current-carrying capacity) is still based on the 60\u00b0C column of the NEC ampacity tables for most applications. The higher temperature rating provides a safety margin.\\n\\n<\/p>\n

\n

\\n\\n<\/p>\n

NM-B vs Romex: What’s the Difference?<\/h2>\n

\\nMany people ask about NM-B vs Romex<\/strong>\u2014but they’re actually the same thing.\\n<\/p>\n

Understanding the Terms<\/h3>\n

\\n<\/p>\n

    \\n \\t<\/p>\n
  • NM-B<\/strong> = The official electrical code designation (what electricians and inspectors call it)<\/li>\n

    \\n \\t<\/p>\n

  • Romex<\/strong> = A brand name owned by Southwire that has become the common term (like ‘Kleenex’ for tissues)<\/li>\n

    \\n<\/ul>\n

    \\nAll Romex is NM-B cable, but not all NM-B cable is technically ‘Romex’ brand.<\/strong>\\n\\nWhen you go to a hardware store and ask for ‘Romex,’ you’ll get NM-B cable. When reading electrical codes or inspection reports, you’ll see it called ‘NM-B’ or ‘Type NM-B.’\\n<\/p>\n

    What ‘Romex’ Actually Means<\/h3>\n

    \\n’Romex’ is simply a trade name that stuck. Other manufacturers make identical NM-B cable under different brand names:\\n<\/p>\n

      \\n \\t<\/p>\n
    • Southwire’s Romex<\/li>\n

      \\n \\t<\/p>\n

    • Cerrowire’s NM-B<\/li>\n

      \\n \\t<\/p>\n

    • United Copper’s NM-B<\/li>\n

      \\n \\t<\/p>\n

    • And many others<\/li>\n

      \\n<\/ul>\n

      \\nThey all meet the same NEC standards for Type NM-B cable.\\n\\n<\/p>\n

      \n

      \\n\\n<\/p>\n

      What Is NM-B Wire Used For?<\/h2>\n

      \\nType NM wire<\/strong> is the standard cable for residential electrical installations. Here’s where it’s commonly used:\\n<\/p>\n

      Common NM-B Wire Applications<\/h3>\n

      \\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n
      Application<\/th>\n

      \\n<\/p>\n

      		Typical Wire Size<\/th>\n

      \\n<\/p>\n

      		Details<\/th>\n

      \\n<\/tr>\n

      \\n<\/thead>\n

      \\n<\/p>\n

      Lighting circuits<\/strong><\/td>\n

      \\n<\/p>\n

      		14\/2 or 14\/3 NM-B<\/td>\n

      \\n<\/p>\n

      		15-amp circuits<\/td>\n

      \\n<\/tr>\n

      \\n<\/p>\n

      General outlets<\/strong><\/td>\n

      \\n<\/p>\n

      		14\/2 or 12\/2 NM-B<\/td>\n

      \\n<\/p>\n

      		15 or 20-amp circuits<\/td>\n

      \\n<\/tr>\n

      \\n<\/p>\n

      Kitchen outlets<\/strong><\/td>\n

      \\n<\/p>\n

      		12\/2 NM-B<\/td>\n

      \\n<\/p>\n

      		20-amp small appliance circuits<\/td>\n

      \\n<\/tr>\n

      \\n<\/p>\n

      Bathroom outlets<\/strong><\/td>\n

      \\n<\/p>\n

      		12\/2 NM-B<\/td>\n

      \\n<\/p>\n

      		20-amp circuits<\/td>\n

      \\n<\/tr>\n

      \\n<\/p>\n

      240V appliances<\/strong><\/td>\n

      \\n<\/p>\n

      		10\/2 or 8\/3 NM-B<\/td>\n

      \\n<\/p>\n

      		Dryers, ranges, water heaters<\/td>\n

      \\n<\/tr>\n

      \\n<\/p>\n

      Air conditioner<\/strong><\/td>\n

      \\n<\/p>\n

      		10\/2 or 12\/2 NM-B<\/td>\n

      \\n<\/p>\n

      		Based on unit requirements<\/td>\n

      \\n<\/tr>\n

      \\n<\/p>\n

      Three-way switches<\/strong><\/td>\n

      \\n<\/p>\n

      		14\/3 or 12\/3 NM-B<\/td>\n

      \\n<\/p>\n

      		Requires 3-wire cable<\/td>\n

      \\n<\/tr>\n

      \\n<\/tbody>\n

      \\n<\/table>\n

      \\n<\/p>\n

      Where NM-B Cable Can Be Used<\/h3>\n

      \\n\u2705 Approved locations:<\/strong>\\n<\/p>\n

        \\n \\t<\/p>\n
      • Inside walls, ceilings, and floors<\/li>\n

        \\n \\t<\/p>\n

      • Exposed in dry locations (basements, attics)<\/li>\n

        \\n \\t<\/p>\n

      • One and two-family dwellings<\/li>\n

        \\n \\t<\/p>\n

      • Multi-family dwellings (with restrictions)<\/li>\n

        \\n \\t<\/p>\n

      • Apartments and condos (interior only)<\/li>\n

        \\n<\/ul>\n

        \\n\u274c Not permitted:<\/strong>\\n<\/p>\n

          \\n \\t<\/p>\n
        • Exposed to moisture or wet locations<\/li>\n

          \\n \\t<\/p>\n

        • Underground (direct burial)<\/li>\n

          \\n \\t<\/p>\n

        • Embedded in concrete<\/li>\n

          \\n \\t<\/p>\n

        • Exposed outdoors<\/li>\n

          \\n \\t<\/p>\n

        • In corrosive environments<\/li>\n

          \\n \\t<\/p>\n

        • As service entrance cable<\/li>\n

          \\n \\t<\/p>\n

        • In commercial\/industrial buildings (with exceptions)<\/li>\n

          \\n \\t<\/p>\n

        • Exposed in garages (must be protected above 8 feet)<\/li>\n

          \\n<\/ul>\n

          \\n\\n<\/p>\n

          \n

          \\n\\n<\/p>\n

          Understanding NM-B Wire Size Markings<\/h2>\n

          \\nWhen you look at NM-B cable, you’ll see markings like ’14\/2,’ ’12\/2,’ or ’10\/3.’ Here’s what they mean:\\n<\/p>\n

          Decoding Wire Size Numbers<\/h3>\n

          \\nFormat: [Gauge] \/ [Number of Conductors]<\/strong>\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n
          Marking<\/th>\n

          \\n<\/p>\n

          		Wire Gauge<\/th>\n

          \\n<\/p>\n

          		Number of Conductors<\/th>\n

          \\n<\/p>\n

          		What It Contains<\/th>\n

          \\n<\/tr>\n

          \\n<\/thead>\n

          \\n<\/p>\n

          14\/2<\/strong><\/td>\n

          \\n<\/p>\n

          		14 AWG<\/td>\n

          \\n<\/p>\n

          		2 current-carrying<\/td>\n

          \\n<\/p>\n

          		1 hot (black), 1 neutral (white), 1 ground (bare)<\/td>\n

          \\n<\/tr>\n

          \\n<\/p>\n

          14\/3<\/strong><\/td>\n

          \\n<\/p>\n

          		14 AWG<\/td>\n

          \\n<\/p>\n

          		3 current-carrying<\/td>\n

          \\n<\/p>\n

          		1 hot (black), 1 hot (red), 1 neutral (white), 1 ground (bare)<\/td>\n

          \\n<\/tr>\n

          \\n<\/p>\n

          12\/2<\/strong><\/td>\n

          \\n<\/p>\n

          		12 AWG<\/td>\n

          \\n<\/p>\n

          		2 current-carrying<\/td>\n

          \\n<\/p>\n

          		1 hot (black), 1 neutral (white), 1 ground (bare)<\/td>\n

          \\n<\/tr>\n

          \\n<\/p>\n

          12\/3<\/strong><\/td>\n

          \\n<\/p>\n

          		12 AWG<\/td>\n

          \\n<\/p>\n

          		3 current-carrying<\/td>\n

          \\n<\/p>\n

          		1 hot (black), 1 hot (red), 1 neutral (white), 1 ground (bare)<\/td>\n

          \\n<\/tr>\n

          \\n<\/p>\n

          10\/2<\/strong><\/td>\n

          \\n<\/p>\n

          		10 AWG<\/td>\n

          \\n<\/p>\n

          		2 current-carrying<\/td>\n

          \\n<\/p>\n

          		1 hot (black), 1 neutral (white), 1 ground (bare)<\/td>\n

          \\n<\/tr>\n

          \\n<\/tbody>\n

          \\n<\/table>\n

          \\nNote<\/strong>: The ground wire is not counted in the ‘\/2’ or ‘\/3’ designation\u2014it’s always present as an extra bare or green wire.\\n<\/code>\\n\\n<\/p>\n

          \n

          \\n\\n<\/p>\n

          NM-B Wire Ampacity Chart<\/h2>\n

          \\nThe NM-B wire ampacity<\/strong> determines how much current the wire can safely carry. This is critical for proper circuit protection.\\n<\/p>\n

          Standard NM-B Ampacity Ratings<\/h3>\n

          \\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n
          Wire Size<\/th>\n

          \\n<\/p>\n

          		Maximum Ampacity<\/th>\n

          \\n<\/p>\n

          		Circuit Breaker Size<\/th>\n

          \\n<\/p>\n

          		Common Use<\/th>\n

          \\n<\/tr>\n

          \\n<\/thead>\n

          \\n<\/p>\n

          14 AWG<\/strong><\/td>\n

          \\n<\/p>\n

          		15 amps<\/td>\n

          \\n<\/p>\n

          		15-amp breaker<\/td>\n

          \\n<\/p>\n

          		Lighting, general outlets<\/td>\n

          \\n<\/tr>\n

          \\n<\/p>\n

          12 AWG<\/strong><\/td>\n

          \\n<\/p>\n

          		20 amps<\/td>\n

          \\n<\/p>\n

          		20-amp breaker<\/td>\n

          \\n<\/p>\n

          		Kitchen, bathroom, general outlets<\/td>\n

          \\n<\/tr>\n

          \\n<\/p>\n

          10 AWG<\/strong><\/td>\n

          \\n<\/p>\n

          		30 amps<\/td>\n

          \\n<\/p>\n

          		30-amp breaker<\/td>\n

          \\n<\/p>\n

          		Water heater, window AC, dryer (partial)<\/td>\n

          \\n<\/tr>\n

          \\n<\/p>\n

          8 AWG<\/strong><\/td>\n

          \\n<\/p>\n

          		40 amps<\/td>\n

          \\n<\/p>\n

          		40-amp breaker<\/td>\n

          \\n<\/p>\n

          		Electric range, large AC units<\/td>\n

          \\n<\/tr>\n

          \\n<\/p>\n

          6 AWG<\/strong><\/td>\n

          \\n<\/p>\n

          		55 amps<\/td>\n

          \\n<\/p>\n

          		50-amp breaker<\/td>\n

          \\n<\/p>\n

          		Electric range, large appliances<\/td>\n

          \\n<\/tr>\n

          \\n<\/tbody>\n

          \\n<\/table>\n

          \\n<\/p>\n

          Important Ampacity Notes<\/h3>\n

          \\nTemperature derating<\/strong>: When multiple NM-B cables are bundled together or pass through insulation, ampacity must be reduced. Consult NEC Article 310 for specific derating factors.\\n\\nVoltage drop<\/strong>: For long runs (over 50-100 feet), consider using larger wire to minimize voltage drop, even if ampacity is adequate.\\n\\nAlways use proper breaker size<\/strong>: The breaker must match the wire size, never exceed it:\\n<\/p>\n

            \\n \\t<\/p>\n
          • 14 AWG \u2192 Maximum 15-amp breaker<\/li>\n

            \\n \\t<\/p>\n

          • 12 AWG \u2192 Maximum 20-amp breaker<\/li>\n

            \\n \\t<\/p>\n

          • 10 AWG \u2192 Maximum 30-amp breaker<\/li>\n

            \\n<\/ul>\n

            \\n\\n<\/p>\n

            \n

            \\n\\n<\/p>\n

            NM vs NM-B: What Changed?<\/h2>\n

            \\nUnderstanding NM vs NM-B<\/strong> helps explain why the ‘B’ designation was added.\\n<\/p>\n

            Evolution of Non-Metallic Cable<\/h3>\n

            \\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n
            Feature<\/th>\n

            \\n<\/p>\n

            		Original NM<\/th>\n

            \\n<\/p>\n

            		Modern NM-B<\/th>\n

            \\n<\/tr>\n

            \\n<\/thead>\n

            \\n<\/p>\n

            Introduced<\/strong><\/td>\n

            \\n<\/p>\n

            		1920s<\/td>\n

            \\n<\/p>\n

            		1984<\/td>\n

            \\n<\/tr>\n

            \\n<\/p>\n

            Conductor insulation<\/strong><\/td>\n

            \\n<\/p>\n

            		60\u00b0C rated<\/td>\n

            \\n<\/p>\n

            		90\u00b0C rated<\/td>\n

            \\n<\/tr>\n

            \\n<\/p>\n

            Jacket material<\/strong><\/td>\n

            \\n<\/p>\n

            		Paper\/fabric early, then PVC<\/td>\n

            \\n<\/p>\n

            		Modern PVC compound<\/td>\n

            \\n<\/tr>\n

            \\n<\/p>\n

            Conductor material<\/strong><\/td>\n

            \\n<\/p>\n

            		Copper<\/td>\n

            \\n<\/p>\n

            		Copper (aluminum available in some sizes)<\/td>\n

            \\n<\/tr>\n

            \\n<\/p>\n

            Ampacity<\/strong><\/td>\n

            \\n<\/p>\n

            		Based on 60\u00b0C<\/td>\n

            \\n<\/p>\n

            		Rated for 90\u00b0C, used at 60\u00b0C ampacity<\/td>\n

            \\n<\/tr>\n

            \\n<\/p>\n

            Code status<\/strong><\/td>\n

            \\n<\/p>\n

            		Obsolete<\/td>\n

            \\n<\/p>\n

            		Current standard<\/td>\n

            \\n<\/tr>\n

            \\n<\/p>\n

            Color coding<\/strong><\/td>\n

            \\n<\/p>\n

            		Varies<\/td>\n

            \\n<\/p>\n

            		Standardized (black=hot, white=neutral, red=second hot)<\/td>\n

            \\n<\/tr>\n

            \\n<\/tbody>\n

            \\n<\/table>\n

            \\n<\/p>\n

            Why the Change to NM-B?<\/h3>\n

            \\nThe upgrade to NM-B in 1984 provided:\\n<\/p>\n

              \\n \\t<\/p>\n
            • Better heat resistance<\/strong>: Safer in bundled applications<\/li>\n

              \\n \\t<\/p>\n

            • Improved safety margin<\/strong>: More tolerance for temperature rise<\/li>\n

              \\n \\t<\/p>\n

            • Modern insulation materials<\/strong>: Better durability and flexibility<\/li>\n

              \\n \\t<\/p>\n

            • Standardization<\/strong>: Consistent specifications across manufacturers<\/li>\n

              \\n<\/ul>\n

              \\n\\n<\/p>\n

              \n

              \\n\\n<\/p>\n

              NM vs NMC Cable<\/h2>\n

              \\nAnother common question: NM vs NMC cable<\/strong>\u2014what’s the difference?\\n<\/p>\n

              NM-B vs NM-C Cable Comparison<\/h3>\n

              \\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n
              Feature<\/th>\n

              \\n<\/p>\n

              		NM-B<\/th>\n

              \\n<\/p>\n

              		NM-C<\/th>\n

              \\n<\/tr>\n

              \\n<\/thead>\n

              \\n<\/p>\n

              Full name<\/strong><\/td>\n

              \\n<\/p>\n

              		Non-Metallic sheathed cable, Type B<\/td>\n

              \\n<\/p>\n

              		Non-Metallic sheathed cable, Type C (corrosion-resistant)<\/td>\n

              \\n<\/tr>\n

              \\n<\/p>\n

              Jacket<\/strong><\/td>\n

              \\n<\/p>\n

              		Standard PVC<\/td>\n

              \\n<\/p>\n

              		Reinforced, moisture-resistant<\/td>\n

              \\n<\/tr>\n

              \\n<\/p>\n

              Approved locations<\/strong><\/td>\n

              \\n<\/p>\n

              		Dry locations only<\/td>\n

              \\n<\/p>\n

              		Damp, moist, or corrosive locations<\/td>\n

              \\n<\/tr>\n

              \\n<\/p>\n

              Cost<\/strong><\/td>\n

              \\n<\/p>\n

              		Standard<\/td>\n

              \\n<\/p>\n

              		30-50% more expensive<\/td>\n

              \\n<\/tr>\n

              \\n<\/p>\n

              Common use<\/strong><\/td>\n

              \\n<\/p>\n

              		Interior residential wiring<\/td>\n

              \\n<\/p>\n

              		Barns, garages, crawl spaces<\/td>\n

              \\n<\/tr>\n

              \\n<\/p>\n

              Availability<\/strong><\/td>\n

              \\n<\/p>\n

              		Widely available<\/td>\n

              \\n<\/p>\n

              		Less common<\/td>\n

              \\n<\/tr>\n

              \\n<\/tbody>\n

              \\n<\/table>\n

              \\nWhen to use NM-C:<\/strong>\\n<\/p>\n

                \\n \\t<\/p>\n
              • Unfinished basements with potential moisture<\/li>\n

                \\n \\t<\/p>\n

              • Attached garages<\/li>\n

                \\n \\t<\/p>\n

              • Agricultural buildings<\/li>\n

                \\n \\t<\/p>\n

              • Any location subject to dampness or corrosion<\/li>\n

                \\n<\/ul>\n

                \\nMost residential work uses NM-B<\/strong> because interior spaces are considered dry locations.\\n\\n<\/p>\n

                \n

                \\n\\n<\/p>\n

                NM-B Installation Requirements<\/h2>\n

                \\nProper installation of Type NM cable ensures safety and code compliance.\\n<\/p>\n

                Securing and Supporting<\/h3>\n

                \\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n
                Requirement<\/th>\n

                \\n<\/p>\n

                		Specification<\/th>\n

                \\n<\/tr>\n

                \\n<\/thead>\n

                \\n<\/p>\n

                Support spacing<\/strong><\/td>\n

                \\n<\/p>\n

                		Within 12′ of boxes, every 4.5 feet along runs<\/td>\n

                \\n<\/tr>\n

                \\n<\/p>\n

                Staple type<\/strong><\/td>\n

                \\n<\/p>\n

                		Insulated staples that don’t damage cable<\/td>\n

                \\n<\/tr>\n

                \\n<\/p>\n

                Bending radius<\/strong><\/td>\n

                \\n<\/p>\n

                		Minimum 5\u00d7 cable diameter<\/td>\n

                \\n<\/tr>\n

                \\n<\/p>\n

                Protection<\/strong><\/td>\n

                \\n<\/p>\n

                		Required where subject to physical damage<\/td>\n

                \\n<\/tr>\n

                \\n<\/tbody>\n

                \\n<\/table>\n

                \\n<\/p>\n

                Running NM-B Through Framing<\/h3>\n

                \\n<\/p>\n

                  \\n \\t<\/p>\n
                • Holes in studs<\/strong>: 1-1\/4′ minimum from edge of stud<\/li>\n

                  \\n \\t<\/p>\n

                • Notches<\/strong>: Protect with 1\/16′ steel plate<\/li>\n

                  \\n \\t<\/p>\n

                • Multiple cables<\/strong>: Maintain spacing when possible to prevent overheating<\/li>\n

                  \\n<\/ul>\n

                  \\n<\/p>\n

                  Exposure and Protection<\/h3>\n

                  \\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n
                  Location<\/th>\n

                  \\n<\/p>\n

                  		Requirements<\/th>\n

                  \\n<\/tr>\n

                  \\n<\/thead>\n

                  \\n<\/p>\n

                  Attics<\/strong><\/td>\n

                  \\n<\/p>\n

                  		Protected from damage, run along joists or through holes<\/td>\n

                  \\n<\/tr>\n

                  \\n<\/p>\n

                  Basements<\/strong><\/td>\n

                  \\n<\/p>\n

                  		Can be exposed on walls, must be supported properly<\/td>\n

                  \\n<\/tr>\n

                  \\n<\/p>\n

                  Garages<\/strong><\/td>\n

                  \\n<\/p>\n

                  		Protected above 8 feet from floor<\/td>\n

                  \\n<\/tr>\n

                  \\n<\/p>\n

                  Crawl spaces<\/strong><\/td>\n

                  \\n<\/p>\n

                  		Protected where accessible<\/td>\n

                  \\n<\/tr>\n

                  \\n<\/tbody>\n

                  \\n<\/table>\n

                  \\n\\n<\/p>\n

                  \n

                  \\n\\n<\/p>\n

                  Common NM-B Wire Questions<\/h2>\n

                  \\n<\/p>\n

                  Can I use NM-B wire outdoors?<\/h3>\n

                  \\nNo.<\/strong> NM-B is rated for dry locations only. For outdoor use:\\n<\/p>\n

                    \\n \\t<\/p>\n
                  • Use UF (Underground Feeder) cable<\/li>\n

                    \\n \\t<\/p>\n

                  • Use individual THWN wires in conduit<\/li>\n

                    \\n \\t<\/p>\n

                  • Use direct burial rated cable<\/li>\n

                    \\n<\/ul>\n

                    \\n<\/p>\n

                    Can NM-B wire be used in conduit?<\/h3>\n

                    \\nTechnically yes, but it’s not ideal.<\/strong> NM-B can be run through conduit for physical protection, but:\\n<\/p>\n

                      \\n \\t<\/p>\n
                    • Individual THWN wires are preferred for conduit runs<\/li>\n

                      \\n \\t<\/p>\n

                    • NM-B jacket doesn’t slide easily through conduit<\/li>\n

                      \\n \\t<\/p>\n

                    • Multiple NM-B cables in conduit require derating<\/li>\n

                      \\n<\/ul>\n

                      \\n<\/p>\n

                      What’s the difference between with ground and w\/ground?<\/h3>\n

                      \\nThey mean the same thing.<\/strong> Modern NM-B always includes a ground wire:\\n<\/p>\n

                        \\n \\t<\/p>\n
                      • ‘With ground’ or ‘w\/ground’ on the jacket<\/li>\n

                        \\n \\t<\/p>\n

                      • Always includes bare or green ground conductor<\/li>\n

                        \\n \\t<\/p>\n

                      • Ground wire not counted in the \/2 or \/3 designation<\/li>\n

                        \\n<\/ul>\n

                        \\n<\/p>\n

                        Can I bury NM-B wire?<\/h3>\n

                        \\nNo.<\/strong> NM-B is not rated for burial. Use:\\n<\/p>\n

                          \\n \\t<\/p>\n
                        • UF (Underground Feeder) cable for direct burial<\/li>\n

                          \\n \\t<\/p>\n

                        • Schedule 40 PVC conduit with THWN wire<\/li>\n

                          \\n \\t<\/p>\n

                        • Metal conduit with appropriate wire<\/li>\n

                          \\n<\/ul>\n

                          \\n\\n<\/p>\n

                          \n

                          \\n\\n<\/p>\n

                          Safety Considerations<\/h2>\n

                          \\n<\/p>\n

                          Identifying NM-B Cable Problems<\/h3>\n

                          \\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n\\n<\/p>\n
                          Warning Sign<\/th>\n

                          \\n<\/p>\n

                          		What It Means<\/th>\n

                          \\n<\/p>\n

                          		Action<\/th>\n

                          \\n<\/tr>\n

                          \\n<\/thead>\n

                          \\n<\/p>\n

                          Melted or burned insulation<\/strong><\/td>\n

                          \\n<\/p>\n

                          		Overheating, overloaded circuit<\/td>\n

                          \\n<\/p>\n

                          		Replace immediately<\/td>\n

                          \\n<\/tr>\n

                          \\n<\/p>\n

                          Exposed conductors<\/strong><\/td>\n

                          \\n<\/p>\n

                          		Damaged jacket<\/td>\n

                          \\n<\/p>\n

                          		Repair or replace<\/td>\n

                          \\n<\/tr>\n

                          \\n<\/p>\n

                          Water exposure<\/strong><\/td>\n

                          \\n<\/p>\n

                          		Cable compromised<\/td>\n

                          \\n<\/p>\n

                          		Replace with appropriate cable type<\/td>\n

                          \\n<\/tr>\n

                          \\n<\/p>\n

                          Rodent damage<\/strong><\/td>\n

                          \\n<\/p>\n

                          		Chewed insulation<\/td>\n

                          \\n<\/p>\n

                          		Replace affected sections<\/td>\n

                          \\n<\/tr>\n

                          \\n<\/p>\n

                          Old fabric-wrapped wire<\/strong><\/td>\n

                          \\n<\/p>\n

                          		Pre-NM-B cable<\/td>\n

                          \\n<\/p>\n

                          		Consider upgrade during renovation<\/td>\n

                          \\n<\/tr>\n

                          \\n<\/tbody>\n

                          \\n<\/table>\n

                          \\n<\/p>\n

                          When to Call an Electrician<\/h3>\n

                          \\nDIY electrical work is legal in most areas for homeowners working on their own property, but consider professional help for:\\n<\/p>\n

                            \\n \\t<\/p>\n
                          • Service panel work<\/li>\n

                            \\n \\t<\/p>\n

                          • 240V circuits<\/li>\n

                            \\n \\t<\/p>\n

                          • Any work requiring permits<\/li>\n

                            \\n \\t<\/p>\n

                          • Situations where you’re unsure about code requirements<\/li>\n

                            \\n \\t<\/p>\n

                          • Complex three-way or four-way switch circuits<\/li>\n

                            \\n<\/ul>\n

                            \\n\\n<\/p>\n

                            \n

                            \\n\\n<\/p>\n

                            Conclusion<\/h2>\n

                            \\nNM-B stands for Non-Metallic sheathed cable, type B\u2014the ‘B’ designation indicating the modern 90\u00b0C temperature-rated version that’s been the residential wiring standard since 1984. Whether you call it NM-B, Romex, or ‘that wire with the plastic jacket,’ it’s the backbone of home electrical systems across North America.\\n\\nKey takeaways:<\/strong>\\n<\/p>\n

                              \\n \\t<\/p>\n
                            • NM-B means Non-Metallic sheathed cable, type B (90\u00b0C rated)<\/li>\n

                              \\n \\t<\/p>\n

                            • The ‘B’ distinguishes it from the older 60\u00b0C rated NM cable<\/li>\n

                              \\n \\t<\/p>\n

                            • ‘Romex’ is a brand name that’s become synonymous with NM-B cable<\/li>\n

                              \\n \\t<\/p>\n

                            • Use 14 AWG for 15-amp circuits, 12 AWG for 20-amp circuits<\/li>\n

                              \\n \\t<\/p>\n

                            • Only use NM-B in dry locations\u2014never outdoors or buried<\/li>\n

                              \\n \\t<\/p>\n

                            • Always follow NEC and local codes for proper installation<\/li>\n

                              \\n \\t<\/p>\n

                            • Wire size markings (14\/2, 12\/3) indicate gauge and number of current-carrying conductors<\/li>\n

                              \\n<\/ul>\n

                              \\nUnderstanding NM-B cable helps you make informed decisions about home wiring projects and communicate effectively with electricians and inspectors.\\n\\n<\/p>\n

                              \n

                              \\n\\nHave electrical wiring questions? Always consult a licensed electrician for work beyond your skill level and follow all local electrical codes.<\/em>“}]}],”section_settings”:””},”scripts”:{},”css”:{},”css_page”:””,”template_setting”:{“settings”:{“id”:”settings”}},”template_setting_top”:{},”page_setting”:{“settings”:[“lock-mode-off”]},”post_type_setting”:{“settings”:{“image”:”https:\/\/totcables.com\/wp-content\/uploads\/2025\/11\/what-does-the-b-stand-for-in-nm-b-wire.webp|380|800|11901″,”excerpt”:”NM-B stands for Non-Metallic sheathed cable, type B, where the B indicates the cable is rated for 90\u00b0C in dry locations. This designation identifies the most common electrical cable used in residential wiring\u2014what most people call Romex a brand name that has become synonymous with NM-B cable.”,”extra_1″:””,”extra_2″:””,”icon”:{“icon”:””,”icon_style”:””,”icon_image”:””}}}}<\/p>\n","protected":false},"excerpt":{"rendered":"

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