{"id":10434,"date":"2025-07-10T14:42:57","date_gmt":"2025-07-10T06:42:57","guid":{"rendered":"https:\/\/totcables.com\/?p=10434"},"modified":"2025-07-10T14:42:57","modified_gmt":"2025-07-10T06:42:57","slug":"what-is-the-difference-between-nm-and-nm-b-wire","status":"publish","type":"post","link":"https:\/\/totcables.com\/?p=10434","title":{"rendered":"What Is the Difference Between NM and NM-B Wire?"},"content":{"rendered":"<p>{&#8220;main-title&#8221;:{&#8220;component&#8221;:&#8221;hc_title&#8221;,&#8221;id&#8221;:&#8221;main-title&#8221;,&#8221;title&#8221;:&#8221;&#8221;,&#8221;subtitle&#8221;:&#8221;If you&#8217;re tackling a residential wiring project or trying to choose the right cable, you may have come across the terms NM and NM-B. Though they look similar, there&#8217;s an important difference between these two types of cables \u2014 especially in terms of temperature rating and code compliance.&#8221;,&#8221;title_content&#8221;:{&#8220;component&#8221;:&#8221;hc_title_image&#8221;,&#8221;id&#8221;:&#8221;title-image&#8221;,&#8221;image&#8221;:&#8221;https:\/\/totcables.com\/wp-content\/uploads\/2025\/07\/What-Is-the-Difference-Between-NM-and-NM-B-Wire.jpg|415|695|10435&#8243;,&#8221;full_screen&#8221;:false,&#8221;full_screen_height&#8221;:&#8221;&#8221;,&#8221;parallax&#8221;:false,&#8221;bleed&#8221;:&#8221;&#8221;,&#8221;ken_burn&#8221;:&#8221;&#8221;,&#8221;overlay&#8221;:&#8221;transparent-dark&#8221;,&#8221;breadcrumbs&#8221;:true,&#8221;white&#8221;:true,&#8221;position&#8221;:&#8221;&#8221;}},&#8221;section_5ZtkF&#8221;:{&#8220;component&#8221;:&#8221;hc_section&#8221;,&#8221;id&#8221;:&#8221;section_5ZtkF&#8221;,&#8221;section_width&#8221;:&#8221;&#8221;,&#8221;animation&#8221;:&#8221;&#8221;,&#8221;animation_time&#8221;:&#8221;&#8221;,&#8221;timeline_animation&#8221;:&#8221;&#8221;,&#8221;timeline_delay&#8221;:&#8221;&#8221;,&#8221;timeline_order&#8221;:&#8221;&#8221;,&#8221;vertical_row&#8221;:&#8221;&#8221;,&#8221;box_middle&#8221;:&#8221;&#8221;,&#8221;css_classes&#8221;:&#8221;&#8221;,&#8221;custom_css_classes&#8221;:&#8221;&#8221;,&#8221;custom_css_styles&#8221;:&#8221;&#8221;,&#8221;section_content&#8221;:[{&#8220;component&#8221;:&#8221;hc_column&#8221;,&#8221;id&#8221;:&#8221;column_vtfQF&#8221;,&#8221;column_width&#8221;:&#8221;col-md-12&#8243;,&#8221;animation&#8221;:&#8221;&#8221;,&#8221;animation_time&#8221;:&#8221;&#8221;,&#8221;timeline_animation&#8221;:&#8221;&#8221;,&#8221;timeline_delay&#8221;:&#8221;&#8221;,&#8221;timeline_order&#8221;:&#8221;&#8221;,&#8221;css_classes&#8221;:&#8221;&#8221;,&#8221;custom_css_classes&#8221;:&#8221;&#8221;,&#8221;custom_css_styles&#8221;:&#8221;&#8221;,&#8221;main_content&#8221;:[{&#8220;component&#8221;:&#8221;hc_wp_editor&#8221;,&#8221;id&#8221;:&#8221;Xhugf&#8221;,&#8221;css_classes&#8221;:&#8221;&#8221;,&#8221;custom_css_classes&#8221;:&#8221;&#8221;,&#8221;custom_css_styles&#8221;:&#8221;&#8221;,&#8221;editor_content&#8221;:&#8221;<\/p>\n<p data-start='661' data-end='962'>If you&#8217;re tackling a residential wiring project or trying to choose the right cable, you may have come across the terms <strong data-start='781' data-end='787'>NM<\/strong> and <strong data-start='792' data-end='800'>NM-B<\/strong>. Though they look similar, there&#8217;s an important difference between these two types of cables \u2014 especially in terms of <strong data-start='919' data-end='961'>temperature rating and code compliance<\/strong>.<\/p>\n<p>\\n\\n\\n<div id=\"attachment_10435\" style=\"width: 310px\" class=\"wp-caption aligncenter\"><img aria-describedby=\"caption-attachment-10435\" class='size-medium wp-image-10435' src='https:\/\/totcables.com\/wp-content\/uploads\/2025\/07\/What-Is-the-Difference-Between-NM-and-NM-B-Wire-300x179.jpg' alt='What Is the Difference Between NM and NM-B Wire' width='300' height='179'><p id=\"caption-attachment-10435\" class=\"wp-caption-text\">What Is the Difference Between NM and NM-B Wire<\/p><\/div>\\n<\/p>\n<p data-start='964' data-end='1067'>In this article, we\u2019ll break down what NM and NM-B mean, how they differ, and which one you should use.<\/p>\n<p>\\n\\n\\n<\/p>\n<hr data-start='1069' data-end='1072'>\\n\\n<\/p>\n<h2 data-start='1074' data-end='1094'>What Is NM Cable?<\/h2>\n<p>\\n<\/p>\n<p data-start='1096' data-end='1285'><strong data-start='1096' data-end='1102'>NM<\/strong> stands for <strong data-start='1114' data-end='1130'>Non-Metallic<\/strong> cable, also commonly called <strong data-start='1159' data-end='1169'>Romex\u00ae<\/strong> (a brand name). It is a type of electrical cable used for interior residential wiring. NM cables typically contain:<\/p>\n<p>\\n\\n<\/p>\n<ul data-start='1286' data-end='1396'>\\n \\t<\/p>\n<li data-start='1286' data-end='1324'>\\n\n<p data-start='1288' data-end='1324'>One or more <strong data-start='1300' data-end='1324'>insulated conductors<\/strong><\/p>\n<p>\\n<\/li>\n<p>\\n \\t<\/p>\n<li data-start='1325' data-end='1349'>\\n\n<p data-start='1327' data-end='1349'>A <strong data-start='1329' data-end='1349'>bare ground wire<\/strong><\/p>\n<p>\\n<\/li>\n<p>\\n \\t<\/p>\n<li data-start='1350' data-end='1396'>\\n\n<p data-start='1352' data-end='1396'>A <strong data-start='1354' data-end='1381'>non-metallic PVC jacket<\/strong> for protection<\/p>\n<p>\\n<\/li>\n<p>\\n<\/ul>\n<p>\\n<\/p>\n<p data-start='1398' data-end='1557'>Before 1985, NM cable came with a temperature rating of <strong data-start='1454' data-end='1470'>60\u00b0C (140\u00b0F)<\/strong>, which was adequate at the time but no longer meets modern code for most applications.<\/p>\n<p>\\n\\n\\n<\/p>\n<hr data-start='1559' data-end='1562'>\\n\\n<\/p>\n<h2 data-start='1564' data-end='1586'>What Is NM-B Cable?<\/h2>\n<p>\\n<\/p>\n<p data-start='1588' data-end='1791'><strong data-start='1588' data-end='1596'>NM-B<\/strong> stands for<a href='https:\/\/totcables.com\/nm-b-wire\/'> <strong data-start='1608' data-end='1633'>Non-Metallic \u2013 Type B<\/strong><\/a>, the current standard for residential non-metallic sheathed cable in the U.S. The \u201cB\u201d designation refers to the upgraded <strong data-start='1755' data-end='1777'>temperature rating<\/strong> of the cable.<\/p>\n<p>\\n<\/p>\n<p data-start='1793' data-end='1806'>Key features:<\/p>\n<p>\\n\\n<\/p>\n<ul data-start='1807' data-end='1983'>\\n \\t<\/p>\n<li data-start='1807' data-end='1852'>\\n\n<p data-start='1809' data-end='1852'><strong data-start='1809' data-end='1835'>Rated for 90\u00b0C (194\u00b0F)<\/strong> in dry locations<\/p>\n<p>\\n<\/li>\n<p>\\n \\t<\/p>\n<li data-start='1853' data-end='1915'>\\n\n<p data-start='1855' data-end='1915'><strong data-start='1855' data-end='1902'>Meets modern NEC (National Electrical Code)<\/strong> requirements<\/p>\n<p>\\n<\/li>\n<p>\\n \\t<\/p>\n<li data-start='1916' data-end='1983'>\\n\n<p data-start='1918' data-end='1983'>Available in common sizes like <strong data-start='1949' data-end='1957'>14\/2<\/strong>, <strong data-start='1959' data-end='1967'>12\/2<\/strong>, <strong data-start='1969' data-end='1977'>10\/2<\/strong>, etc.<\/p>\n<p>\\n<\/li>\n<p>\\n<\/ul>\n<p>\\n<\/p>\n<p data-start='1985' data-end='2053'>Today, <strong data-start='1992' data-end='2016'>NM-B has replaced NM<\/strong> in almost all standard applications.<\/p>\n<p>\\n\\n\\n<\/p>\n<hr data-start='2055' data-end='2058'>\\n\\n<\/p>\n<h2 data-start='2060' data-end='2102'>NM vs NM-B: What\u2019s the Real Difference?<\/h2>\n<p>\\n<\/p>\n<div class='_tableContainer_80l1q_1'>\\n<\/p>\n<div class='_tableWrapper_80l1q_14 group flex w-fit flex-col-reverse' tabindex='-1'>\\n<\/p>\n<table class='w-fit min-w-(--thread-content-width)' data-start='2104' data-end='2760'>\\n<\/p>\n<thead data-start='2104' data-end='2196'>\\n<\/p>\n<tr data-start='2104' data-end='2196'>\\n<\/p>\n<th data-start='2104' data-end='2128' data-col-size='sm'>Feature<\/th>\n<p>\\n<\/p>\n<th data-start='2128' data-end='2156' data-col-size='sm'>NM Cable<\/th>\n<p>\\n<\/p>\n<th data-start='2156' data-end='2196' data-col-size='sm'>NM-B Cable<\/th>\n<p>\\n<\/tr>\n<p>\\n<\/thead>\n<p>\\n<\/p>\n<tbody data-start='2291' data-end='2760'>\\n<\/p>\n<tr data-start='2291' data-end='2384'>\\n<\/p>\n<td data-start='2291' data-end='2315' data-col-size='sm'>Temperature Rating<\/td>\n<p>\\n<\/p>\n<td data-start='2315' data-end='2344' data-col-size='sm'>60\u00b0C (140\u00b0F)<\/td>\n<p>\\n<\/p>\n<td data-start='2344' data-end='2384' data-col-size='sm'>90\u00b0C (194\u00b0F)<\/td>\n<p>\\n<\/tr>\n<p>\\n<\/p>\n<tr data-start='2385' data-end='2478'>\\n<\/p>\n<td data-start='2385' data-end='2409' data-col-size='sm'>NEC Compliance<\/td>\n<p>\\n<\/p>\n<td data-start='2409' data-end='2438' data-col-size='sm'>Outdated (pre-1985)<\/td>\n<p>\\n<\/p>\n<td data-start='2438' data-end='2478' data-col-size='sm'>Fully compliant with modern NEC<\/td>\n<p>\\n<\/tr>\n<p>\\n<\/p>\n<tr data-start='2479' data-end='2572'>\\n<\/p>\n<td data-start='2479' data-end='2503' data-col-size='sm'>Availability<\/td>\n<p>\\n<\/p>\n<td data-start='2503' data-end='2532' data-col-size='sm'>Obsolete<\/td>\n<p>\\n<\/p>\n<td data-start='2532' data-end='2572' data-col-size='sm'>Industry standard<\/td>\n<p>\\n<\/tr>\n<p>\\n<\/p>\n<tr data-start='2573' data-end='2666'>\\n<\/p>\n<td data-start='2573' data-end='2597' data-col-size='sm'>Jacket Material<\/td>\n<p>\\n<\/p>\n<td data-start='2597' data-end='2626' data-col-size='sm'>PVC<\/td>\n<p>\\n<\/p>\n<td data-start='2626' data-end='2666' data-col-size='sm'>Improved PVC with color coding<\/td>\n<p>\\n<\/tr>\n<p>\\n<\/p>\n<tr data-start='2667' data-end='2760'>\\n<\/p>\n<td data-start='2667' data-end='2691' data-col-size='sm'>Common Use Today<\/td>\n<p>\\n<\/p>\n<td data-start='2691' data-end='2720' data-col-size='sm'>No longer recommended<\/td>\n<p>\\n<\/p>\n<td data-start='2720' data-end='2760' data-col-size='sm'>Widely used in residential wiring<\/td>\n<p>\\n<\/tr>\n<p>\\n<\/tbody>\n<p>\\n<\/table>\n<p>\\n<\/p>\n<div class='sticky end-(--thread-content-margin) h-0 self-end select-none'>\\n<\/p>\n<div class='absolute end-0 flex items-end'><\/div>\n<p>\\n<\/p><\/div>\n<p>\\n<\/p><\/div>\n<p>\\n<\/p><\/div>\n<p>\\n\\n<\/p>\n<hr data-start='2762' data-end='2765'>\\n\\n<\/p>\n<h2 data-start='2767' data-end='2802'>Why NM-B Is the Current Standard<\/h2>\n<p>\\n<\/p>\n<p data-start='2804' data-end='3031'>Because of its <strong data-start='2819' data-end='2848'>higher temperature rating<\/strong>, NM-B is safer and more versatile. It can handle higher current loads in small-gauge wires without overheating and is required by NEC for most dry-location residential installations.<\/p>\n<p>\\n\\n<\/p>\n<h3 data-start='3033' data-end='3053'>\ud83d\udd27 Applications:<\/h3>\n<p>\\n<\/p>\n<ul data-start='3054' data-end='3160'>\\n \\t<\/p>\n<li data-start='3054' data-end='3080'>\\n\n<p data-start='3056' data-end='3080'>Interior branch circuits<\/p>\n<p>\\n<\/li>\n<p>\\n \\t<\/p>\n<li data-start='3081' data-end='3115'>\\n\n<p data-start='3083' data-end='3115'>Lighting and receptacle circuits<\/p>\n<p>\\n<\/li>\n<p>\\n \\t<\/p>\n<li data-start='3116' data-end='3160'>\\n\n<p data-start='3118' data-end='3160'>Residential and light commercial buildings<\/p>\n<p>\\n<\/li>\n<p>\\n<\/ul>\n<p>\\n<\/p>\n<blockquote data-start='3162' data-end='3356'><p>\\n<\/p>\n<p data-start='3164' data-end='3356'>\u26a0\ufe0f <strong data-start='3167' data-end='3176'>Note:<\/strong> NM-B is only suitable for <strong data-start='3203' data-end='3218'>dry, indoor<\/strong> locations. It is <strong data-start='3236' data-end='3281'>not rated for outdoor or wet environments<\/strong> \u2014 for that, use <strong data-start='3298' data-end='3306'>UF-B<\/strong> (Underground Feeder) or other appropriate cables.<\/p>\n<p>\\n<\/p><\/blockquote>\n<p>\\n\\n<\/p>\n<hr data-start='3358' data-end='3361'>\\n\\n<\/p>\n<h2 data-start='3363' data-end='3382'>Common Questions<\/h2>\n<p>\\n<\/p>\n<p data-start='3384' data-end='3516'><strong data-start='3384' data-end='3420'>Q: Is NM cable still used today?<\/strong><br data-start='3420' data-end='3423'>A: No, NM cable with 60\u00b0C rating is now obsolete. All new residential installations use NM-B.<\/p>\n<p>\\n<\/p>\n<p data-start='3518' data-end='3649'><strong data-start='3518' data-end='3561'>Q: What does the \u201cB\u201d stand for in NM-B?<\/strong><br data-start='3561' data-end='3564'>A: It signifies an upgraded thermal rating and improved jacket, per NEC code updates.<\/p>\n<p>\\n<\/p>\n<p data-start='3651' data-end='3747'><strong data-start='3651' data-end='3700'>Q: Can NM-B be used in wet areas or outdoors?<\/strong><br data-start='3700' data-end='3703'>A: No. NM-B is for <strong data-start='3722' data-end='3737'>dry, indoor<\/strong> use only.<\/p>\n<p>\\n\\n\\n<\/p>\n<hr data-start='3749' data-end='3752'>\\n\\n<\/p>\n<h2 data-start='3754' data-end='3791'>Summary: Which One Should You Use?<\/h2>\n<p>\\n<\/p>\n<p data-start='3793' data-end='3953'>If you&#8217;re wiring a home or updating an old system, <strong data-start='3844' data-end='3852'>NM-B<\/strong> is the correct and code-compliant choice. NM cable is outdated and no longer meets safety standards.<\/p>\n<p>\\n<\/p>\n<p data-start='3955' data-end='4099'>At <strong data-start='3958' data-end='3978'>TOT Wire &amp; Cable<\/strong>, we stock a full range of <a href='https:\/\/totcables.com\/nm-b-wire\/'><strong data-start='4005' data-end='4020'>NM-B cables<\/strong><\/a> including 14\/2, 12\/2, 10\/2 and more \u2014 all compliant with UL and NEC standards.<\/p>\n<p>&#8220;}]}],&#8221;section_settings&#8221;:&#8221;&#8221;},&#8221;scripts&#8221;:{},&#8221;css&#8221;:{},&#8221;css_page&#8221;:&#8221;&#8221;,&#8221;template_setting&#8221;:{&#8220;settings&#8221;:{&#8220;id&#8221;:&#8221;settings&#8221;}},&#8221;template_setting_top&#8221;:{},&#8221;page_setting&#8221;:{&#8220;settings&#8221;:[&#8220;lock-mode-off&#8221;]},&#8221;post_type_setting&#8221;:{&#8220;settings&#8221;:{&#8220;image&#8221;:&#8221;https:\/\/totcables.com\/wp-content\/uploads\/2025\/07\/What-Is-the-Difference-Between-NM-and-NM-B-Wire.jpg|415|695|10435&#8243;,&#8221;excerpt&#8221;:&#8221;If you&#8217;re tackling a residential wiring project or trying to choose the right cable, you may have come across the terms NM and NM-B. Though they look similar, there&#8217;s an important difference between these two types of cables \u2014 especially in terms of temperature rating and code compliance.&#8221;,&#8221;extra_1&#8243;:&#8221;&#8221;,&#8221;extra_2&#8243;:&#8221;&#8221;,&#8221;icon&#8221;:{&#8220;icon&#8221;:&#8221;&#8221;,&#8221;icon_style&#8221;:&#8221;&#8221;,&#8221;icon_image&#8221;:&#8221;&#8221;}}}}<\/p>\n","protected":false},"excerpt":{"rendered":"<p>{&#8220;main-title&#8221;:{&#8220;component&#8221;:&#8221;hc_title&#8221;,&#8221;id&#8221;:&#8221;main-title&#8221;,&#8221;title&#8221;:&#8221;&#8221;,&#8221;subtitle&#8221;:&#8221;If you&#8217;re tackling a residential wiring project or trying to choose the right cable, you may have come across the terms NM and NM-B. 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