{"id":10618,"date":"2025-07-21T17:52:06","date_gmt":"2025-07-21T09:52:06","guid":{"rendered":"https:\/\/totcables.com\/?p=10618"},"modified":"2025-07-21T17:52:06","modified_gmt":"2025-07-21T09:52:06","slug":"thwn-vs-thhn-wire-whats-the-difference-and-which-one-to-choose","status":"publish","type":"post","link":"https:\/\/totcables.com\/?p=10618","title":{"rendered":"THWN vs THHN Wire: What\u2019s the Difference and Which One to Choose?"},"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;When it comes to electrical wiring for residential, commercial, or industrial projects, THWN and THHN wires are two of the most commonly used types. At first glance, they may look similar, but they have important differences in insulation, temperature rating, moisture resistance, and applications.&#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\/THWN-vs-THHN-Wire.jpg|321|800|10619&#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<h3 data-start='208' data-end='228'><strong data-start='212' data-end='228'>Introduction<\/strong><\/h3>\n<p>\\n<\/p>\n<p data-start='229' data-end='553'>When it comes to electrical wiring for residential, commercial, or industrial projects, <strong data-start='317' data-end='325'>THWN<\/strong> and <strong data-start='330' data-end='344'>THHN wires<\/strong> are two of the most commonly used types. At first glance, they may look similar, but they have important differences in <strong data-start='465' data-end='479'>insulation<\/strong>, <strong data-start='481' data-end='503'>temperature rating<\/strong>, <strong data-start='505' data-end='528'>moisture resistance<\/strong>, and <strong data-start='534' data-end='550'>applications<\/strong>.<\/p>\n<p>\\n<\/p>\n<p data-start='555' data-end='664'>This article explains <strong data-start='577' data-end='598'>THWN vs THHN wire<\/strong>, helping you choose the right option for your electrical project.<\/p>\n<p>\\n\\n\\n<div id=\"attachment_10619\" style=\"width: 310px\" class=\"wp-caption aligncenter\"><img aria-describedby=\"caption-attachment-10619\" class='size-medium wp-image-10619' src='https:\/\/totcables.com\/wp-content\/uploads\/2025\/07\/THWN-vs-THHN-Wire-300x120.jpg' alt='THWN vs THHN Wire' width='300' height='120'><p id=\"caption-attachment-10619\" class=\"wp-caption-text\">THWN vs THHN Wire<\/p><\/div>\\n\\n<\/p>\n<hr data-start='666' data-end='669'>\\n\\n<\/p>\n<h2 data-start='671' data-end='699'><strong data-start='674' data-end='699'>1. What is THHN Wire?<\/strong><\/h2>\n<p>\\n<\/p>\n<p data-start='700' data-end='773'><strong data-start='700' data-end='708'>THHN<\/strong> stands for <strong data-start='720' data-end='770'>Thermoplastic High Heat-Resistant Nylon-coated<\/strong>.<\/p>\n<p>\\n\\n<\/p>\n<ul data-start='774' data-end='1038'>\\n \\t<\/p>\n<li data-start='774' data-end='850'>\\n\n<p data-start='776' data-end='850'><strong data-start='776' data-end='791'>Insulation:<\/strong> PVC (Polyvinyl Chloride) insulation with a nylon jacket.<\/p>\n<p>\\n<\/li>\n<p>\\n \\t<\/p>\n<li data-start='851' data-end='919'>\\n\n<p data-start='853' data-end='919'><strong data-start='853' data-end='876'>Temperature Rating:<\/strong> Up to <strong data-start='883' data-end='899'>90\u00b0C (194\u00b0F)<\/strong> in dry locations.<\/p>\n<p>\\n<\/li>\n<p>\\n \\t<\/p>\n<li data-start='920' data-end='982'>\\n\n<p data-start='922' data-end='982'><strong data-start='922' data-end='941'>Voltage Rating:<\/strong> Typically rated for 600V applications.<\/p>\n<p>\\n<\/li>\n<p>\\n \\t<\/p>\n<li data-start='983' data-end='1038'>\\n\n<p data-start='985' data-end='1038'><strong data-start='985' data-end='1001'>Environment:<\/strong> Designed mainly for dry locations.<\/p>\n<p>\\n<\/li>\n<p>\\n<\/ul>\n<p>\\n<\/p>\n<p data-start='1040' data-end='1063'><strong data-start='1040' data-end='1061'>Key Uses of THHN:<\/strong><\/p>\n<p>\\n\\n<\/p>\n<ul data-start='1064' data-end='1184'>\\n \\t<\/p>\n<li data-start='1064' data-end='1104'>\\n\n<p data-start='1066' data-end='1104'>Building wiring and conduit systems.<\/p>\n<p>\\n<\/li>\n<p>\\n \\t<\/p>\n<li data-start='1105' data-end='1144'>\\n\n<p data-start='1107' data-end='1144'>Branch circuits and control wiring.<\/p>\n<p>\\n<\/li>\n<p>\\n \\t<\/p>\n<li data-start='1145' data-end='1184'>\\n\n<p data-start='1147' data-end='1184'>General-purpose indoor installations.<\/p>\n<p>\\n<\/li>\n<p>\\n<\/ul>\n<p>\\n\\n<\/p>\n<hr data-start='1186' data-end='1189'>\\n\\n<\/p>\n<h2 data-start='1191' data-end='1219'><strong data-start='1194' data-end='1219'>2. What is THWN Wire?<\/strong><\/h2>\n<p>\\n<\/p>\n<p data-start='1220' data-end='1298'><strong data-start='1220' data-end='1228'>THWN<\/strong> stands for <strong data-start='1240' data-end='1295'>Thermoplastic Heat and Water-Resistant Nylon-coated<\/strong>.<\/p>\n<p>\\n\\n<\/p>\n<ul data-start='1299' data-end='1623'>\\n \\t<\/p>\n<li data-start='1299' data-end='1365'>\\n\n<p data-start='1301' data-end='1365'><strong data-start='1301' data-end='1316'>Insulation:<\/strong> Similar PVC base insulation with nylon jacket.<\/p>\n<p>\\n<\/li>\n<p>\\n \\t<\/p>\n<li data-start='1366' data-end='1494'>\\n\n<p data-start='1368' data-end='1494'><strong data-start='1368' data-end='1391'>Temperature Rating:<\/strong> 75\u00b0C (167\u00b0F) in wet locations, 90\u00b0C (194\u00b0F) in dry locations (for THWN-2, 90\u00b0C in both dry and wet).<\/p>\n<p>\\n<\/li>\n<p>\\n \\t<\/p>\n<li data-start='1495' data-end='1544'>\\n\n<p data-start='1497' data-end='1544'><strong data-start='1497' data-end='1516'>Voltage Rating:<\/strong> Typically rated for 600V.<\/p>\n<p>\\n<\/li>\n<p>\\n \\t<\/p>\n<li data-start='1545' data-end='1623'>\\n\n<p data-start='1547' data-end='1623'><strong data-start='1547' data-end='1563'>Environment:<\/strong> Specifically designed for both <strong data-start='1595' data-end='1620'>wet and dry locations<\/strong>.<\/p>\n<p>\\n<\/li>\n<p>\\n<\/ul>\n<p>\\n<\/p>\n<p data-start='1625' data-end='1648'><strong data-start='1625' data-end='1646'>Key Uses of THWN:<\/strong><\/p>\n<p>\\n\\n<\/p>\n<ul data-start='1649' data-end='1777'>\\n \\t<\/p>\n<li data-start='1649' data-end='1691'>\\n\n<p data-start='1651' data-end='1691'>Outdoor or underground conduit wiring.<\/p>\n<p>\\n<\/li>\n<p>\\n \\t<\/p>\n<li data-start='1692' data-end='1750'>\\n\n<p data-start='1694' data-end='1750'>Applications exposed to moisture or damp environments.<\/p>\n<p>\\n<\/li>\n<p>\\n \\t<\/p>\n<li data-start='1751' data-end='1777'>\\n\n<p data-start='1753' data-end='1777'>Service entrance wiring.<\/p>\n<p>\\n<\/li>\n<p>\\n<\/ul>\n<p>\\n\\n<\/p>\n<hr data-start='1779' data-end='1782'>\\n\\n<\/p>\n<h2 data-start='1784' data-end='1823'><strong data-start='1787' data-end='1823'>3. Key Differences: THWN vs THHN<\/strong><\/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='1824' data-end='2440'>\\n<\/p>\n<thead data-start='1824' data-end='1902'>\\n<\/p>\n<tr data-start='1824' data-end='1902'>\\n<\/p>\n<th data-start='1824' data-end='1843' data-col-size='sm'><strong data-start='1826' data-end='1837'>Feature<\/strong><\/th>\n<p>\\n<\/p>\n<th data-start='1843' data-end='1872' data-col-size='sm'><strong data-start='1845' data-end='1858'>THHN Wire<\/strong><\/th>\n<p>\\n<\/p>\n<th data-start='1872' data-end='1902' data-col-size='md'><strong data-start='1874' data-end='1887'>THWN Wire<\/strong><\/th>\n<p>\\n<\/tr>\n<p>\\n<\/thead>\n<p>\\n<\/p>\n<tbody data-start='1981' data-end='2440'>\\n<\/p>\n<tr data-start='1981' data-end='2065'>\\n<\/p>\n<td data-start='1981' data-end='2007' data-col-size='sm'><strong data-start='1983' data-end='2006'>Moisture Resistance<\/strong><\/td>\n<p>\\n<\/p>\n<td data-start='2007' data-end='2035' data-col-size='sm'>Dry locations only<\/td>\n<p>\\n<\/p>\n<td data-start='2035' data-end='2065' data-col-size='md'>Wet &amp; dry locations<\/td>\n<p>\\n<\/tr>\n<p>\\n<\/p>\n<tr data-start='2066' data-end='2169'>\\n<\/p>\n<td data-start='2066' data-end='2093' data-col-size='sm'><strong data-start='2068' data-end='2090'>Temperature Rating<\/strong><\/td>\n<p>\\n<\/p>\n<td data-col-size='sm' data-start='2093' data-end='2120'>90\u00b0C in dry<\/td>\n<p>\\n<\/p>\n<td data-col-size='md' data-start='2120' data-end='2169'>75\u00b0C in wet, 90\u00b0C in dry (THWN-2 = 90\u00b0C both)<\/td>\n<p>\\n<\/tr>\n<p>\\n<\/p>\n<tr data-start='2170' data-end='2259'>\\n<\/p>\n<td data-start='2170' data-end='2197' data-col-size='sm'><strong data-start='2172' data-end='2187'>Outdoor Use<\/strong><\/td>\n<p>\\n<\/p>\n<td data-start='2197' data-end='2223' data-col-size='sm'>Not recommended<\/td>\n<p>\\n<\/p>\n<td data-start='2223' data-end='2259' data-col-size='md'>Suitable for outdoor\/underground<\/td>\n<p>\\n<\/tr>\n<p>\\n<\/p>\n<tr data-start='2260' data-end='2344'>\\n<\/p>\n<td data-start='2260' data-end='2287' data-col-size='sm'><strong data-start='2262' data-end='2270'>Cost<\/strong><\/td>\n<p>\\n<\/p>\n<td data-start='2287' data-end='2313' data-col-size='sm'>Slightly cheaper<\/td>\n<p>\\n<\/p>\n<td data-start='2313' data-end='2344' data-col-size='md'>Slightly more expensive<\/td>\n<p>\\n<\/tr>\n<p>\\n<\/p>\n<tr data-start='2345' data-end='2440'>\\n<\/p>\n<td data-start='2345' data-end='2372' data-col-size='sm'><strong data-start='2347' data-end='2359'>Best For<\/strong><\/td>\n<p>\\n<\/p>\n<td data-start='2372' data-end='2398' data-col-size='sm'>Indoor conduit wiring<\/td>\n<p>\\n<\/p>\n<td data-start='2398' data-end='2440' data-col-size='md'>Outdoor or moisture-prone environments<\/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='2442' data-end='2445'>\\n\\n<\/p>\n<h2 data-start='2447' data-end='2484'><strong data-start='2450' data-end='2484'>4. THWN-2 and Dual-Rated Wires<\/strong><\/h2>\n<p>\\n<\/p>\n<p data-start='2485' data-end='2612'>Today, many manufacturers produce <strong data-start='2519' data-end='2551'>dual-rated THHN\/THWN-2 wires<\/strong>, meaning the same wire meets both THHN and THWN standards.<\/p>\n<p>\\n\\n<\/p>\n<ul data-start='2613' data-end='2817'>\\n \\t<\/p>\n<li data-start='2613' data-end='2708'>\\n\n<p data-start='2615' data-end='2708'><strong data-start='2615' data-end='2625'>THWN-2<\/strong> can handle <strong data-start='2637' data-end='2675'>90\u00b0C in both wet and dry locations<\/strong>, making it a versatile choice.<\/p>\n<p>\\n<\/li>\n<p>\\n \\t<\/p>\n<li data-start='2709' data-end='2817'>\\n\n<p data-start='2711' data-end='2817'>If you see a wire marked <strong data-start='2736' data-end='2753'>\u201cTHHN\/THWN-2\u201d<\/strong>, it can be used for nearly all general electrical wiring needs.<\/p>\n<p>\\n<\/li>\n<p>\\n<\/ul>\n<p>\\n\\n<\/p>\n<hr data-start='2819' data-end='2822'>\\n\\n<\/p>\n<h2 data-start='2824' data-end='2870'><strong data-start='2827' data-end='2870'>5. How to Choose Between THHN and THWN?<\/strong><\/h2>\n<p>\\n<\/p>\n<p data-start='2871' data-end='2897'>When deciding, consider:<\/p>\n<p>\\n\\n<\/p>\n<ul data-start='2898' data-end='3227'>\\n \\t<\/p>\n<li data-start='2898' data-end='3039'>\\n\n<p data-start='2900' data-end='3039'><strong data-start='2900' data-end='2926'>Installation Location:<\/strong> If the wire will be in wet or outdoor conditions (e.g., underground conduit), go with <strong data-start='3013' data-end='3036'>THWN or THHN\/THWN-2<\/strong>.<\/p>\n<p>\\n<\/li>\n<p>\\n \\t<\/p>\n<li data-start='3040' data-end='3114'>\\n\n<p data-start='3042' data-end='3114'><strong data-start='3042' data-end='3053'>Budget:<\/strong> THHN may be slightly cheaper for indoor-only applications.<\/p>\n<p>\\n<\/li>\n<p>\\n \\t<\/p>\n<li data-start='3115' data-end='3227'>\\n\n<p data-start='3117' data-end='3227'><strong data-start='3117' data-end='3140'>Future Flexibility:<\/strong> Dual-rated THHN\/THWN-2 is often the smartest option, as it works in both environments.<\/p>\n<p>\\n<\/li>\n<p>\\n<\/ul>\n<p>\\n\\n<\/p>\n<hr data-start='3229' data-end='3232'>\\n\\n<\/p>\n<h2 data-start='3234' data-end='3248'><strong data-start='3237' data-end='3248'>6. FAQs<\/strong><\/h2>\n<p>\\n<\/p>\n<p data-start='3249' data-end='3408'><strong data-start='3249' data-end='3288'>Q1: Can THHN wire be used outdoors?<\/strong><br data-start='3288' data-end='3291'>Only if it\u2019s inside a watertight conduit and not directly exposed to moisture. THWN is better for outdoor conditions.<\/p>\n<p>\\n<\/p>\n<p data-start='3410' data-end='3545'><strong data-start='3410' data-end='3465'>Q2: Is THHN or THWN better for underground conduit?<\/strong><br data-start='3465' data-end='3468'><strong data-start='3468' data-end='3486'>THWN or THWN-2<\/strong> is the correct choice, as it\u2019s rated for wet environments.<\/p>\n<p>\\n<\/p>\n<p data-start='3547' data-end='3697'><strong data-start='3547' data-end='3589'>Q3: What does the \u201c-2\u201d mean in THWN-2?<\/strong><br data-start='3589' data-end='3592'>The \u201c-2\u201d indicates a <strong data-start='3613' data-end='3670'>90\u00b0C temperature rating in both wet and dry locations<\/strong>, making it more versatile.<\/p>\n<p>\\n\\n\\n<\/p>\n<hr data-start='3699' data-end='3702'>\\n\\n<\/p>\n<h2 data-start='3704' data-end='3721'><strong data-start='3707' data-end='3721'>Conclusion<\/strong><\/h2>\n<p>\\n<\/p>\n<p data-start='3722' data-end='3974'>The main difference between <strong data-start='3750' data-end='3773'>THWN and THHN wires<\/strong> is <strong data-start='3777' data-end='3800'>moisture resistance<\/strong>. While THHN is designed for <strong data-start='3829' data-end='3846'>dry locations<\/strong>, THWN (especially THWN-2) can handle <strong data-start='3884' data-end='3914'>wet and outdoor conditions<\/strong>, making it the preferred option for modern installations.<\/p>\n<p>\\n<\/p>\n<p data-start='3976' data-end='4116'>Looking for high-quality <strong data-start='4001' data-end='4029'>THHN\/THWN-2 copper wires<\/strong> at competitive prices? <strong data-start='4053' data-end='4081'>Contact TOT Wire &amp; Cable<\/strong> for bulk orders and expert advice.<\/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\/THWN-vs-THHN-Wire.jpg|321|800|10619&#8243;,&#8221;excerpt&#8221;:&#8221;When it comes to electrical wiring for residential, commercial, or industrial projects, THWN and THHN wires are two of the most commonly used types. At first glance, they may look similar, but they have important differences in insulation, temperature rating, moisture resistance, and applications.&#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;When it comes to electrical wiring for residential, commercial, or industrial projects, THWN and THHN wires are two of the most commonly used types. 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