\\n<\/p>\n
This guide breaks everything down in simple, easy-to-understand language so you\u2019ll know exactly what NM cable is, where it\u2019s used, and where it shouldn\u2019t<\/em> be used.<\/p>\n \\n\\n\\n<\/p>\n \\n what is non metallic sheathed cable<\/p><\/div>\\n<\/p>\n Despite the name, non-metallic wire is not a single wire<\/strong>. \\n<\/p>\n An NM cable typically contains:<\/p>\n \\n\\n<\/p>\n One or two insulated \u201chot\u201d wires<\/strong> (usually black or red)<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n One insulated neutral wire<\/strong> (white)<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n One bare copper grounding wire<\/strong><\/p>\n \\n<\/li>\n \\n<\/ul>\n \\n<\/p>\n The outside is covered with a non-metallic PVC sheath<\/strong>, which is why it\u2019s called \u201cnon-metallic.\u201d<\/p>\n \\n<\/p>\n Most homeowners know this cable by its brand name: Romex<\/strong>.<\/p>\n \\n\\n\\n<\/p>\n \\n<\/p>\n If you live in a wood-frame house, chances are your home is full of NM cable. It\u2019s designed specifically for dry, indoor residential wiring<\/strong>.<\/p>\n \\n<\/p>\n Here are the most common places you\u2019ll find it:<\/p>\n \\n\\n<\/p>\n \\n<\/p>\n NM cable powers:<\/p>\n \\n\\n<\/p>\n Outlets<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n Lights and switches<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n Ceiling fans<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n Bathroom exhaust fans<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n Small appliances<\/p>\n \\n<\/li>\n \\n<\/ul>\n \\n<\/p>\n For example:<\/p>\n \\n\\n<\/p>\n NM-B 14\/2<\/strong> is used for 15-amp lighting circuits<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n NM-B 12\/2<\/strong> is used for 20-amp general-purpose circuits<\/p>\n \\n<\/li>\n \\n<\/ul>\n \\n<\/p>\n \\n<\/p>\n Electricians run NM cable through:<\/p>\n \\n\\n<\/p>\n Studs<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n Floor joists<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n Attic spaces<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n Crawl spaces \\n<\/li>\n \\n<\/ul>\n \\n<\/p>\n \\n<\/p>\n Such as:<\/p>\n \\n\\n<\/p>\n Dishwashers<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n Garbage disposals<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n Water heaters (in some cases)<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n Furnaces<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n Home HVAC components<\/p>\n \\n<\/li>\n \\n<\/ul>\n \\n\\n<\/p>\n \\n<\/p>\n NM cable is great, but it\u2019s not suitable for every environment. \\n\\n<\/p>\n \\n<\/p>\n \\n<\/p>\n \\n<\/p>\n \\n<\/p>\n \\n<\/p>\n For these environments, electricians use:<\/p>\n \\n\\n<\/p>\n UF-B cable<\/strong> for underground or outdoor use<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n MC cable<\/strong> for exposed indoor areas<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n THHN wire in conduit<\/strong> for commercial or wet locations<\/p>\n \\n<\/li>\n \\n<\/ul>\n \\n\\n<\/p>\n \\n<\/p>\n Homeowners love it because it keeps costs down. \\n<\/p>\n Advantages include:<\/strong><\/p>\n \\n\\n<\/p>\n Flexible and easy to pull through framing<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n Requires no metal conduit<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n Quick installation<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n Lower material and labor cost<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n Safe and code-approved for indoor residential use<\/p>\n \\n<\/li>\n \\n<\/ul>\n \\n\\n<\/p>\n \\n<\/p>\n There are two main types you\u2019ll encounter:<\/p>\n \\n\\n<\/p>\n \\n<\/p>\n Used for almost all indoor home wiring<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n Heat-rated to 90\u00b0C<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n Lightweight and easy to handle<\/p>\n \\n<\/li>\n \\n<\/ul>\n \\n<\/p>\n \\n<\/p>\n Can be buried underground<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n Fully sealed for moisture resistance<\/p>\n \\n<\/li>\n \\n \\t<\/p>\n Much tougher than NM-B<\/p>\n \\n<\/li>\n \\n<\/ul>\n \\n<\/p>\n If you\u2019re wiring anything outdoors \u2014 a shed, a pump, landscape lighting \u2014 UF-B<\/strong> is the correct choice, not NM-B.<\/p>\n \\n\\n\\n<\/p>\n \\n<\/p>\n If you live in a house, non-metallic wire is probably running through all your walls<\/strong>. It\u2019s safe, affordable, and perfect for indoor, dry-location electrical circuits. Just remember:<\/p>\n \\n\\n<\/p>\n \\n<\/p>\n NM cable = indoor only<\/strong> \\n<\/p><\/blockquote>\n “}]}],”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\/12\/what-is-non-metallic-sheathed-cable.jpg|450|800|11945″,”excerpt”:”If you\u2019ve ever opened an outlet box or watched an electrician work inside a wall, you\u2019ve probably seen a bundle of wires wrapped in a soft plastic jacket. That is non-metallic wire, also commonly known as NM cable or Romex\u00ae. It\u2019s the most common type of wiring used in modern homes \u2014 but many homeowners aren\u2019t sure what it actually does.”,”extra_1″:””,”extra_2″:””,”icon”:{“icon”:””,”icon_style”:””,”icon_image”:””}}}}<\/p>\n","protected":false},"excerpt":{"rendered":" {“main-title”:{“component”:”hc_title”,”id”:”main-title”,”title”:””,”subtitle”:”If you\u2019ve ever opened an outlet box or watched an electrician work inside a wall, you\u2019ve probably seen a bundle of wires wrapped in a soft plastic jacket. That is non-metallic wire, also commonly known as NM cable or Romex\u00ae. It\u2019s the most common type of wiring used in modern homes \u2014 but many homeowners […]<\/p>\n","protected":false},"author":1,"featured_media":11945,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-11944","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"acf":[],"yoast_head":"\n
\\n\\n<\/p>\nWhat Exactly Is Non-Metallic Wire?<\/strong><\/h2>\n
It\u2019s actually a bundle of wires<\/strong> inside a flexible outer jacket.<\/p>\n\\n \\t<\/p>\n
\\n\\n<\/p>\nWhere Is Non-Metallic Sheathed Cable Used?<\/strong><\/h2>\n
1. Standard household circuits<\/strong><\/h3>\n
\\n \\t<\/p>\n
\\n \\t<\/p>\n
2. Inside walls, ceilings, and attics<\/strong><\/h3>\n
\\n \\t<\/p>\n
As long as the area is dry<\/strong> and not exposed to physical damage.<\/p>\n3. Many indoor appliances<\/strong><\/h3>\n
\\n \\t<\/p>\n
\\n\\n<\/p>\nWhere NM Cable Should Not<\/em> Be Used<\/strong><\/h2>\n
Building codes strictly forbid NM cable in the following locations:<\/p>\n\u274c Outdoors<\/strong><\/h3>\n
\u274c Underground<\/strong> (even inside conduit)<\/h3>\n
\u274c Wet or damp areas<\/strong> (garages, unfinished basements, exterior walls in some climates)<\/h3>\n
\u274c Exposed or high-risk areas<\/strong> where it can be damaged<\/h3>\n
\u274c Commercial buildings with open wiring<\/strong><\/h3>\n
\\n \\t<\/p>\n
\\n\\n<\/p>\nWhy Do Electricians Use NM Cable?<\/strong><\/h2>\n
Electricians love it because it\u2019s easy to work with.<\/p>\n\\n \\t<\/p>\n
\\n\\n<\/p>\nDifferent Types of NM Cable<\/strong><\/h2>\n
NM-B (most common)<\/strong><\/h3>\n
\\n \\t<\/p>\n
UF-B (often confused with NM)<\/strong><\/h3>\n
\\n \\t<\/p>\n
\\n\\n<\/p>\nIn Simple Terms\u2026<\/strong><\/h2>\n
UF-B cable = outdoor\/underground<\/strong>
MC cable = exposed areas or commercial use<\/strong><\/p>\n