{"id":4037,"date":"2026-08-28T09:30:19","date_gmt":"2026-08-28T09:30:19","guid":{"rendered":"https:\/\/huyuglobal.com\/?p=4037"},"modified":"2026-08-28T09:30:21","modified_gmt":"2026-08-28T09:30:21","slug":"12-gauge-wire","status":"publish","type":"post","link":"https:\/\/huyuglobal.com\/vi\/blog\/12-gauge-wire\/","title":{"rendered":"D\u00e2y 12 Gauge: H\u01b0\u1edbng D\u1eabn Ho\u00e0n Ch\u1ec9nh v\u1ec1 Th\u00f4ng S\u1ed1 K\u1ef9 Thu\u1eadt, D\u00f2ng \u0110i\u1ec7n, \u1ee8ng D\u1ee5ng v\u00e0 Chi Ph\u00ed"},"content":{"rendered":"<p>N\u1ebfu b\u1ea1n h\u1ecfi b\u1ea5t k\u1ef3 th\u1ee3 \u0111i\u1ec7n n\u00e0o d\u00e2y d\u1eabn \u0111a n\u0103ng nh\u1ea5t trong m\u1ed9t l\u1eafp \u0111\u1eb7t d\u00e2n d\u1ee5ng ho\u1eb7c th\u01b0\u01a1ng m\u1ea1i nh\u1eb9 l\u00e0 g\u00ec, c\u00e2u tr\u1ea3 l\u1eddi h\u1ea7u nh\u01b0 lu\u00f4n gi\u1ed1ng nhau: 12 AWG (c\u1ee1 12). Th\u1eadt v\u1eady, \u0111\u00e2y l\u00e0 c\u00e1p nh\u1ecf nh\u1ea5t \u0111\u01b0\u1ee3c ph\u00e9p theo National Electric Code cho c\u00e1c m\u1ea1ch nh\u00e1nh 20 amp; t\u1ee9c l\u00e0 c\u00e1c m\u1ea1ch nh\u00e1nh cung c\u1ea5p ph\u1ea7n l\u1edbn cho b\u1ebfp, ph\u00f2ng t\u1eafm, gara v\u00e0 thi\u1ebft b\u1ecb \u0111i\u1ec7n. Tuy nhi\u00ean, c\u00e1c c\u00e2u h\u1ecfi v\u1ec1 ch\u1ee7 \u0111\u1ec1 n\u00e0y v\u1eabn kh\u00f4ng ng\u1eebng xu\u1ea5t hi\u1ec7n: d\u00e2y #12 c\u00f3 bao nhi\u00eau ampe? N\u00f3 c\u00f3 b\u1eb1ng v\u1edbi d\u00e2y 12 AWG t\u01b0\u01a1ng \u0111\u01b0\u01a1ng kh\u00f4ng? T\u00f4i c\u00f3 th\u1ec3 truy\u1ec1n qua n\u00f3 25 ampe trong m\u1ed9t kho\u1ea3ng th\u1eddi gian kh\u00f4ng? V\u00e0 t\u1ea1i sao d\u00e2y trong c\u1eeda h\u00e0ng l\u1ea1i \u0111\u1eaft h\u01a1n nhi\u1ec1u so v\u1edbi THHN trong kho?<\/p>\n<p>H\u01b0\u1edbng d\u1eabn n\u00e0y tr\u1ea3 l\u1eddi t\u1eebng c\u00e2u h\u1ecfi: k\u00edch th\u01b0\u1edbc v\u1eadt l\u00fd c\u1ee7a 12 AWG l\u00e0 g\u00ec, quy t\u1eafc ampacity theo y\u00eau c\u1ea7u c\u1ee7a Code ra sao, c\u00e1p n\u00e0y ph\u1ea3i d\u00f9ng \u1edf \u0111\u00e2u v\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c d\u00f9ng \u1edf \u0111\u00e2u, gi\u00e1 m\u1ed7i foot cho t\u1ea5t c\u1ea3 c\u00e1c lo\u1ea1i c\u00e1ch \u0111i\u1ec7n ph\u1ed5 bi\u1ebfn, d\u00e2y n\u00e0y so v\u1edbi d\u00e2y c\u1ee1 14, 10 v\u00e0 8 nh\u01b0 th\u1ebf n\u00e0o v\u00e0 mua \u1edf \u0111\u00e2u.<\/p>\n<blockquote><p>\u0110\u01b0\u1eddng k\u00ednh d\u1eabn c\u1ee7a d\u00e2y \u0111\u1ed3ng 12 AWG l\u00e0 0,0808 inch (2,05 mm), l\u00e0 m\u1ee9c t\u1ed1i thi\u1ec3u theo NEC y\u00eau c\u1ea7u cho m\u1ea1ch 20 ampe (NEC 240.4 (D)). M\u1ee9c ampacity t\u1ed1i \u0111a cho lo\u1ea1i d\u1eabn n\u00e0y l\u00e0 20 ampe \u1edf 60\u00b0C (c\u00e1p NM-B) v\u00e0 25 ampe \u1edf 75\u00b0C (THHN\/THWN trong \u1ed1ng d\u1eabn) theo B\u1ea3ng NEC 310.15 (B) (16). \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 d\u00f9 d\u00e2y c\u00f3 kh\u1ea3 n\u0103ng t\u1ed1i \u0111a 25 ampe, gi\u1edbi h\u1ea1n 20 ampe ph\u1ea3i \u0111\u01b0\u1ee3c tu\u00e2n th\u1ee7 v\u00ec b\u1ed9 ng\u1eaft m\u1ea1ch ph\u1ea3i b\u1ea3o v\u1ec7 d\u00e2y. Kh\u00f4ng khuy\u1ebfn ngh\u1ecb s\u1eed d\u1ee5ng 25 ampe tr\u00ean d\u00e2y 12 AWG cho c\u00e1c m\u1ea1ch \u1ee9ng d\u1ee5ng chung.<\/p><\/blockquote>\n<h2>D\u00e2y C\u1ee1 12 L\u00e0 G\u00ec? K\u00edch Th\u01b0\u1edbc v\u00e0 \u0110\u01b0\u1eddng K\u00ednh<\/h2>\n<p>\u201cGauge\u201d li\u00ean quan \u0111\u1ebfn h\u1ec7 th\u1ed1ng d\u00e2y d\u1eabn g\u1ecdi l\u00e0 American Wire Gauge (AWG); trong AWG, s\u1ed1 nh\u1ecf h\u01a1n ch\u1ec9 d\u00e2y d\u00e0y h\u01a1n. D\u00e2y \u0111\u1ed3ng \u0111\u1eb7c c\u1ee1 12 c\u00f3 \u0111\u01b0\u1eddng k\u00ednh 0,0808 inch (kho\u1ea3ng 2,05 mm) v\u1edbi ti\u1ebft di\u1ec7n kho\u1ea3ng 3,31 mm\u00b2 (6530 circular mils). L\u1edbp c\u00e1ch \u0111i\u1ec7n l\u00e0m t\u0103ng \u0111\u01b0\u1eddng k\u00ednh t\u1ed5ng th\u1ec3 c\u1ee7a d\u00e2y l\u00ean kho\u1ea3ng 0,119-0,128 inch, t\u00f9y thu\u1ed9c v\u00e0o lo\u1ea1i c\u00e1ch \u0111i\u1ec7n s\u1eed d\u1ee5ng v\u00e0 d\u00e2y c\u00f3 d\u1eabn \u0111\u1eb7c hay b\u1ec7n.<\/p>\n<p>C\u00f3 hai d\u1ea1ng d\u00e2y; d\u1eabn \u0111\u1eb7c, l\u00e0 m\u1ed9t d\u00e2y c\u1ee9ng d\u00f9ng trong c\u00e1p NM-B (Romex), v\u00e0 d\u00e2y b\u1ec7n, l\u00e0m t\u1eeb 19 s\u1ee3i xo\u1eafn l\u1ea1i v\u1edbi nhau v\u00e0 d\u00f9ng trong d\u00e2y THHN, c\u0169ng nh\u01b0 trong c\u00e1c \u1ee9ng d\u1ee5ng linh ho\u1ea1t. D\u1ea1ng sau linh ho\u1ea1t h\u01a1n v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu u\u1ed1n cao h\u01a1n, l\u00e0m cho d\u00e2y b\u1ec7n ph\u00f9 h\u1ee3p h\u01a1n v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng \u0111i\u1ec7n kh\u00e1c nhau.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4039\" style=\"text-align: center;\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/08\/How-Many-Amps-Can-12-AWG-Carry.webp\" alt=\"D\u00e2y 12 AWG C\u00f3 Th\u1ec3 Ch\u1ecbu \u0110\u01b0\u1ee3c Bao Nhi\u00eau Ampe? Quy T\u1eafc Code\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>D\u00e2y 12 AWG C\u00f3 Th\u1ec3 Ch\u1ecbu \u0110\u01b0\u1ee3c Bao Nhi\u00eau Ampe? Quy T\u1eafc Code<\/h2>\n<p>C\u00f4ng su\u1ea5t c\u00e1p c\u1ee7a d\u00e2y \u0111\u1ed3ng 12 AWG \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi nhi\u1ec7t \u0111\u1ed9 c\u00e1ch \u0111i\u1ec7n, trong khi th\u00f4ng s\u1ed1 m\u1ea1ch \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi c\u01a1 ch\u1ebf b\u1ea3o v\u1ec7 c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch. C\u00f3 hai lo\u1ea1i gi\u00e1 tr\u1ecb:<\/p>\n<ul>\n<li>C\u00f4ng su\u1ea5t d\u1eabn (c\u00f4ng su\u1ea5t v\u1eadt l\u00fd c\u1ee7a d\u00e2y), nh\u01b0 ch\u1ec9 ra trong B\u1ea3ng NEC 310.15(B)(16), n\u01a1i d\u00e2y c\u00f3 c\u00f4ng su\u1ea5t 25 ampe \u1edf 75\u00b0C (c\u00e1p THHN\/THWN trong \u1ed1ng) v\u00e0 30 ampe \u1edf 90\u00b0C (d\u00e2y THHN v\u1edbi \u0111\u1ea7u n\u1ed1i c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng \u1edf 90\u00b0C).<\/li>\n<li>Dung l\u01b0\u1ee3ng m\u1ea1ch (dung l\u01b0\u1ee3ng c\u1ee7a c\u01a1 ch\u1ebf b\u1ea3o v\u1ec7), nh\u01b0 \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh trong NEC 240.4(D), trong \u0111\u00f3 c\u1ea7u dao ph\u1ea3i cung c\u1ea5p b\u1ea3o v\u1ec7 cho d\u00e2y \u0111\u1ed3ng 12 AWG v\u1edbi m\u1ee9c kh\u00f4ng v\u01b0\u1ee3t qu\u00e1 20 ampe.<\/li>\n<\/ul>\n<p>Vi\u1ec7c s\u1eed d\u1ee5ng c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t m\u1ea1ch 12 AWG c\u00f3 c\u1ea7u dao \u0111\u1ecbnh m\u1ee9c 20 Ampe, trong khi d\u00e2y c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng d\u01b0\u1edbi t\u1ea3i li\u00ean t\u1ee5c 16 Ampe (quy t\u1eafc 80%). \u0110\u1ecbnh m\u1ee9c 25 Ampe \u1edf 75\u00b0C t\u1ed3n t\u1ea1i \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o bi\u00ean an to\u00e0n v\u00e0 cho m\u1ed9t s\u1ed1 ngo\u1ea1i l\u1ec7 trong m\u00e3, kh\u00f4ng ph\u1ea3i \u0111\u1ec3 k\u1ebft n\u1ed1i c\u1ea7u dao 25A v\u1edbi d\u00e2y 12 AWG. N\u1ebfu c\u00f3 b\u1ea5t k\u1ef3 nghi ng\u1edd n\u00e0o v\u1ec1 d\u00e2y s\u1eed d\u1ee5ng, s\u1ebd \u0111\u01b0\u1ee3c khuy\u00ean theo m\u1ea1ch \u0111\u1ecbnh m\u1ee9c th\u1ea5p h\u01a1n \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o an to\u00e0n cho d\u00e2y.<\/p>\n<h2>C\u00e1c lo\u1ea1i 12 AWG: THHN, NM-B, UF-B, MC \u2014 S\u1ef1 kh\u00e1c bi\u1ec7t l\u00e0 g\u00ec<\/h2>\n<p>C\u00e1c ki\u1ec3u c\u00e1ch c\u00e1ch \u0111i\u1ec7n\/c\u1ea5u tr\u00fac kh\u00e1c nhau t\u1ed3n t\u1ea1i cho 12 AWG, m\u1ed7i lo\u1ea1i c\u00f3 m\u00e3 l\u1eafp \u0111\u1eb7t ri\u00eang.<\/p>\n<table>\n<thead>\n<tr>\n<th>Lo\u1ea1i<\/th>\n<th>C\u1ea5u tr\u00fac<\/th>\n<th>Dung l\u01b0\u1ee3ng d\u00f2ng \u0111i\u1ec7n (12 AWG Cu)<\/th>\n<th>N\u01a1i s\u1eed d\u1ee5ng<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>THHN\/THWN-2<\/td>\n<td>D\u00e2y d\u1eabn \u0111\u01a1n, c\u00e1ch \u0111i\u1ec7n PVC + \u00e1o nylon<\/td>\n<td>25A (75\u00b0C); 30A (90\u00b0C)<\/td>\n<td>\u1ed0ng d\u1eabn v\u00e0 khay c\u00e1p trong th\u01b0\u01a1ng m\u1ea1i\/c\u00f4ng nghi\u1ec7p; 600V; v\u1ecb tr\u00ed \u1ea9m \u01b0\u1edbt ho\u1eb7c kh\u00f4<\/td>\n<\/tr>\n<tr>\n<td>NM-B (Romex)<\/td>\n<td>2-4 d\u00e2y d\u1eabn trong v\u1ecf PVC, d\u00e2y \u0111\u1eb7c ho\u1eb7c b\u1ec7n<\/td>\n<td>20A (60\u00b0C)<\/td>\n<td>Nh\u00e0 \u1edf v\u00e0 th\u01b0\u01a1ng m\u1ea1i nh\u1eb9, gi\u1ea5u trong t\u01b0\u1eddng\/tr\u1ea7n<\/td>\n<\/tr>\n<tr>\n<td>UF-B<\/td>\n<td>Ki\u1ec3u NM v\u1edbi \u00e1o ch\u1ed1ng \u1ea9m<\/td>\n<td>20A (60\u00b0C)<\/td>\n<td>D\u00e2y c\u1ea5p ng\u1ea7m \u0111\u1ebfn nh\u00e0 kho\/ga-ra v\u00e0 ch\u1ea1y ngo\u00e0i tr\u1eddi<\/td>\n<\/tr>\n<tr>\n<td>C\u00e1p MC<\/td>\n<td>D\u00e2y d\u1eabn b\u00ean trong l\u1edbp gi\u00e1p kim lo\u1ea1i linh ho\u1ea1t<\/td>\n<td>20A (\u0111\u1ecbnh m\u1ee9c 75\u00b0C \u0111i\u1ec3n h\u00ecnh)<\/td>\n<td>Th\u01b0\u01a1ng m\u1ea1i, ch\u1ea1y l\u1ed9, khu v\u1ef1c ch\u1ed1ng ch\u00e1y<\/td>\n<\/tr>\n<tr>\n<td>THW\/THWN \u0111\u01a1n<\/td>\n<td>T\u01b0\u01a1ng t\u1ef1 d\u00f2ng THHN<\/td>\n<td>25A (75\u00b0C)<\/td>\n<td>V\u1ecb tr\u00ed \u1ea9m \u01b0\u1edbt, d\u00e2y c\u1ea5p c\u00f4ng nghi\u1ec7p<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>M\u1ed9t trong nh\u1eefng l\u1ef1a ch\u1ecdn t\u1ed1t cho ch\u1ea1y \u1ed1ng d\u1eabn l\u00e0 THHN\/THWN-2, c\u00f3 chi ph\u00ed th\u1ea5p h\u01a1n m\u1ed7i foot so v\u1edbi d\u00e2y NM-B v\u00ec ch\u1ec9 s\u1eed d\u1ee5ng m\u1ed9t d\u00e2y d\u1eabn trong d\u00e2y n\u00e0y, trong khi NM-B (th\u01b0\u01a1ng hi\u1ec7u Romex thu\u1ed9c s\u1edf h\u1eefu c\u1ee7a Southwire) l\u00e0 d\u00e2y ti\u00eau chu\u1ea9n d\u00f9ng trong l\u1eafp \u0111\u1eb7t th\u00f4 nh\u00e0 \u1edf. UF-B \u0111\u01b0\u1ee3c d\u00f9ng cho l\u1eafp \u0111\u1eb7t d\u00e2y ng\u1ea7m, v\u00e0 MC l\u00e0 t\u00ean g\u1ecdi c\u1ee7a d\u00e2y gi\u00e1p d\u00f9ng trong l\u1eafp \u0111\u1eb7t th\u01b0\u01a1ng m\u1ea1i.<\/p>\n<h2>N\u01a1i s\u1eed d\u1ee5ng d\u00e2y 12 Gauge (v\u00e0 n\u01a1i kh\u00f4ng s\u1eed d\u1ee5ng)<\/h2>\n<p>Theo \u0110i\u1ec1u 210 c\u1ee7a m\u00e3 NEC, c\u00e1c m\u1ea1ch cho thi\u1ebft b\u1ecb nh\u1ecf trong b\u1ebfp, khu v\u1ef1c \u0103n u\u1ed1ng v\u00e0 gi\u1eb7t l\u00e0 n\u00ean l\u00e0 20 ampe (210.52), \u0111\u1ed3ng th\u1eddi c\u00e1c m\u1ea1ch cho ph\u00f2ng t\u1eafm c\u0169ng n\u00ean l\u00e0 20 ampe (210.11(C)(3)). T\u1ea5t c\u1ea3 c\u00e1c m\u1ea1ch n\u00e0y n\u00ean \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t v\u1edbi d\u00e2y 12 AWG. C\u00e1c \u1ee9ng d\u1ee5ng ti\u00eau chu\u1ea9n kh\u00e1c:<\/p>\n<ul>\n<li>\u1ed4 c\u1eafm khu v\u1ef1c b\u1ebfp v\u00e0 \u0103n u\u1ed1ng \u2013 m\u1ea1ch cho thi\u1ebft b\u1ecb nh\u1ecf 20 ampe \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u theo m\u00e3;<\/li>\n<li>M\u1ea1ch \u1ed5 c\u1eafm ph\u00f2ng t\u1eafm \u2013 20 ampe v\u00e0 \u0111\u01b0\u1ee3c trang b\u1ecb GFCI;<\/li>\n<li>\u1ed4 c\u1eafm ga-ra v\u00e0 x\u01b0\u1edfng \u2013 20 ampe cho d\u1ee5ng c\u1ee5 bao g\u1ed3m m\u00e1y c\u01b0a b\u00e0n v\u00e0 m\u00e1y h\u00fat b\u1ee5i;<\/li>\n<li>M\u00e1y \u0111i\u1ec1u h\u00f2a kh\u00f4ng kh\u00ed c\u1eeda s\u1ed5 \u2013 15 ampe ch\u1ea1y tr\u00ean m\u1ea1ch 20 ampe v\u1edbi d\u00e2y 12 AWG;<\/li>\n<li>\u1ed4 c\u1eafm v\u00e0 chi\u1ebfu s\u00e1ng \u0111a n\u0103ng trong c\u00f4ng tr\u00ecnh x\u00e2y d\u1ef1ng m\u1edbi \u2013 nhi\u1ec1u th\u1ee3 \u0111i\u1ec7n s\u1eed d\u1ee5ng d\u00e2y 12 AWG to\u00e0n b\u1ed9 c\u00f4ng tr\u00ecnh c\u00f3 ho\u1eb7c kh\u00f4ng tr\u1ed9n v\u1edbi d\u00e2y 14.<\/li>\n<li>D\u00e2y c\u1ea5p \u0111\u1ebfn b\u1ea3ng ph\u1ee5 v\u00e0 c\u00f4ng tr\u00ecnh \u2013 th\u01b0\u1eddng, c\u00e1c d\u00e2y c\u1ea5p ng\u1eafn trong dung l\u01b0\u1ee3ng cho ph\u00e9p; c\u00e1c d\u00e2y c\u1ea5p d\u00e0i n\u00ean d\u00f9ng d\u00e2y 10 AWG ho\u1eb7c d\u00e0y h\u01a1n.<\/li>\n<\/ul>\n<p>N\u01a1i 12 AWG kh\u00f4ng ph\u00f9 h\u1ee3p: M\u1ea1ch chi\u1ebfu s\u00e1ng 15A c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng t\u1ed1t v\u1edbi d\u00e2y 14 AWG; thi\u1ebft b\u1ecb 240V tr\u00ean 20A n\u00ean \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i s\u1eed d\u1ee5ng d\u00e2y \u00edt nh\u1ea5t 10 AWG; c\u00e1c \u0111o\u1ea1n feeder d\u00e0i n\u00ean s\u1eed d\u1ee5ng c\u00e1p k\u00edch th\u01b0\u1edbc l\u1edbn h\u01a1n do s\u1ee5t \u00e1p. N\u1ebfu b\u1ea1n \u0111ang \u0111i d\u00e2y cho subpanel ho\u1eb7c thi\u1ebft b\u1ecb n\u1eb7ng, h\u01b0\u1edbng d\u1eabn c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/how-many-watts-on-a-15-amp-circuit\/\">m\u1ea1ch 15 amp th\u1ef1c s\u1ef1 c\u00f3 th\u1ec3 mang t\u1ea3i bao nhi\u00eau<\/a> v\u00e0 <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/what-is-mccb-and-mcb\/\">Ph\u00e2n t\u00edch MCB v\u00e0 MCCB<\/a> gi\u00fap b\u1ea1n ch\u1ecdn d\u00e2y ph\u00f9 h\u1ee3p v\u1edbi b\u1ed9 ng\u1eaft m\u1ea1ch v\u00e0 t\u1ea3i \u0111\u00fang c\u00e1ch.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4040\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/08\/12-AWG-vs-14-10-and-8-Gauge-How-to-Choose.webp\" alt=\"So s\u00e1nh 12 AWG v\u1edbi 14, 10 v\u00e0 8 Gauge: C\u00e1ch ch\u1ecdn\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>So s\u00e1nh 12 AWG v\u1edbi 14, 10 v\u00e0 8 Gauge: C\u00e1ch ch\u1ecdn<\/h2>\n<table>\n<thead>\n<tr>\n<th>AWG (\u0111\u1ed3ng)<\/th>\n<th>\u0110\u01b0\u1eddng k\u00ednh<\/th>\n<th>M\u1ea1ch t\u1ed1i \u0111a (NEC 240.4(D))<\/th>\n<th>D\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c 75\u00b0C<\/th>\n<th>S\u1eed d\u1ee5ng \u0111i\u1ec3n h\u00ecnh<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>14 AWG<\/td>\n<td>0641\u2033 (1.63 mm)<\/td>\n<td>15A<\/td>\n<td>20A<\/td>\n<td>Chi\u1ebfu s\u00e1ng, m\u1ea1ch t\u1ed5ng 15A<\/td>\n<\/tr>\n<tr>\n<td>12 AWG<\/td>\n<td>0808\u2033 (2.05 mm)<\/td>\n<td>20A<\/td>\n<td>25A<\/td>\n<td>\u1ed4 c\u1eafm nh\u00e0 b\u1ebfp\/ph\u00f2ng t\u1eafm\/ga-ra, d\u1ee5ng c\u1ee5<\/td>\n<\/tr>\n<tr>\n<td>10 AWG<\/td>\n<td>1019\u2033 (2.59 mm)<\/td>\n<td>30A<\/td>\n<td>35A<\/td>\n<td>B\u00ecnh n\u01b0\u1edbc n\u00f3ng, m\u00e1y \u0111i\u1ec1u h\u00f2a, b\u1ed9 s\u1ea1c EV<\/td>\n<\/tr>\n<tr>\n<td>8 AWG<\/td>\n<td>1285\u2033 (3.26 mm)<\/td>\n<td>40A<\/td>\n<td>50A<\/td>\n<td>M\u00e1y s\u1ea5y, ngu\u1ed3n c\u1ea5p ph\u1ee5<\/td>\n<\/tr>\n<tr>\n<td>6 AWG<\/td>\n<td>162\u2033 (4.11 mm)<\/td>\n<td>55A<\/td>\n<td>65A<\/td>\n<td>B\u1ebfp, ngu\u1ed3n c\u1ea5p n\u1eb7ng<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Quy t\u1eafc c\u01a1 b\u1ea3n l\u00e0 d\u00e2y d\u1eabn ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi c\u1ea7u dao, v\u00e0 c\u1ea7u dao ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi t\u1ea3i. Khi m\u1ea1ch \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf cho t\u1ea3i ti\u1ec1m n\u0103ng 20A (v\u00ed d\u1ee5, trong nh\u00e0 b\u1ebfp, ph\u00f2ng t\u1eafm, ga-ra v\u00e0 x\u01b0\u1edfng), n\u00ean s\u1eed d\u1ee5ng c\u00e1p 12 AWG. \u0110\u1ed1i v\u1edbi c\u00e1c m\u1ea1ch ch\u1ec9 d\u00e0nh cho chi\u1ebfu s\u00e1ng 15A, n\u00ean d\u00f9ng c\u00e1p \u0111\u1ed3ng 14 AWG v\u00ec n\u00f3 ti\u1ebft ki\u1ec7m chi ph\u00ed v\u00e0 tu\u00e2n th\u1ee7 quy \u0111\u1ecbnh \u0111i\u1ec7n \u0111\u1ecba ph\u01b0\u01a1ng. \u0110\u1ed1i v\u1edbi t\u1ea3i ho\u1ea1t \u0111\u1ed9ng \u1edf 240V v\u00e0 y\u00eau c\u1ea7u t\u1eeb 25-30A, n\u00ean chuy\u1ec3n sang 10 AWG. Nhi\u1ec1u th\u1ee3 \u0111i\u1ec7n c\u1ed1 g\u1eafng kh\u00f4ng thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc d\u00e2y trong su\u1ed1t c\u00f4ng vi\u1ec7c v\u00e0 th\u01b0\u1eddng d\u00f9ng d\u00e2y 12 AWG ngay c\u1ea3 khi kh\u00f4ng b\u1eaft bu\u1ed9c theo quy \u0111\u1ecbnh v\u00ec chi ph\u00ed th\u00eam l\u00e0 t\u1ed1i thi\u1ec3u v\u00e0 kh\u00f4ng lo d\u00f9ng sai d\u00e2y.<\/p>\n<h2>S\u1ee5t \u00e1p v\u00e0 chi\u1ec1u d\u00e0i d\u00e2y<\/h2>\n<p>S\u1ee5t \u00e1p l\u00e0 m\u1ed9t trong nh\u1eefng chi ph\u00ed kh\u00f4ng \u0111\u01b0\u1ee3c ch\u00fa \u00fd tr\u00ean d\u00e2y d\u00e0i. V\u1edbi m\u1ea1ch mang 20A trong 50 feet, d\u00e2y \u0111\u1ed3ng 12 AWG s\u1ebd c\u00f3 s\u1ee5t \u00e1p kho\u1ea3ng 2.8V (2.31%), ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c theo khuy\u1ebfn ngh\u1ecb c\u1ee7a National Electrical Code (NEC) l\u00e0 3% cho m\u1ea1ch nh\u00e1nh. Tuy nhi\u00ean, d\u00e2y \u0111\u1ed3ng 14 AWG trong c\u00f9ng chi\u1ec1u d\u00e0i s\u1ebd s\u1ee5t \u00e1p 4.5V (3.75%), v\u01b0\u1ee3t gi\u1edbi h\u1ea1n. D\u00e2y d\u00e0i l\u00e0m gi\u1ea3m m\u00f4-men kh\u1edfi \u0111\u1ed9ng c\u1ee7a \u0111\u1ed9ng c\u01a1, l\u00e0m m\u1edd \u0111\u00e8n v\u00e0 g\u00e2y c\u00e1c v\u1ea5n \u0111\u1ec1 kh\u00e1c. Th\u1ef1c t\u1ebf, n\u1ebfu c\u1ea7n ch\u1ea1y 20A tr\u00ean kho\u1ea3ng c\u00e1ch d\u00e0i h\u01a1n 75-100 feet, n\u00ean chuy\u1ec3n sang d\u00e2y 10 AWG ho\u1eb7c d\u00f9ng hai m\u1ea1ch. N\u1ebfu d\u00e2y d\u00e0i h\u01a1n 100 feet, c\u1ea7n t\u00ednh s\u1ee5t \u00e1p theo NEC Ch\u01b0\u01a1ng 9, b\u1ea3ng 8.<\/p>\n<h2>\u0110\u1ed3ng so v\u1edbi Nh\u00f4m<\/h2>\n<p>V\u00ec \u0111\u1ed3ng g\u1ea7n nh\u01b0 l\u00e0 ch\u1ea5t d\u1eabn \u0111i\u1ec7n hi\u1ec7u qu\u1ea3 100% l\u00fd thuy\u1ebft (95%), v\u00e0 c\u00f3 nhi\u1ec1u \u01b0u \u0111i\u1ec3m, \u0111\u1ed3ng l\u00e0 kim lo\u1ea1i \u01b0u ti\u00ean d\u00f9ng trong m\u1ea1ch nh\u00e1nh. M\u1eb7c d\u00f9 nh\u00f4m nh\u1eb9 h\u01a1n g\u1ea7n m\u1ed9t ph\u1ea7n ba, quy \u0111\u1ecbnh y\u00eau c\u1ea7u d\u00e2y nh\u00f4m ph\u1ea3i l\u1edbn h\u01a1n d\u00e2y \u0111\u1ed3ng hai c\u1ee1 v\u00e0 ph\u1ea3i d\u00f9ng k\u1ebft n\u1ed1i \u0111\u1eb7c bi\u1ec7t. Do \u0111\u00f3, d\u00e2y c\u1ee1 12 kh\u00f4ng bao gi\u1edd l\u00e0 d\u00e2y nh\u00f4m; tuy nhi\u00ean, d\u00e2y nh\u00f4m \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 gi\u1ea3m chi ph\u00ed trong c\u00e1p ngu\u1ed3n ch\u00ednh.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4041\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/08\/How-Much-Does-12-Gauge-Wire-Cost.webp\" alt=\"Gi\u00e1 d\u00e2y 12 gauge l\u00e0 bao nhi\u00eau?\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>D\u00e2y 12 Gauge gi\u00e1 bao nhi\u00eau?<\/h2>\n<p>Gi\u00e1 \u0111\u1ed3ng bi\u1ebfn \u0111\u1ed9ng, nh\u01b0ng gi\u00e1 d\u00e2y \u0111\u1ed3ng 12 AWG t\u1ea1i M\u1ef9 \u1ed5n \u0111\u1ecbnh.<\/p>\n<table>\n<thead>\n<tr>\n<th>S\u1ea3n ph\u1ea9m<\/th>\n<th>Gi\u00e1 \u0111i\u1ec3n h\u00ecnh<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>D\u00e2y \u0111\u01a1n THHN 12 AWG (r\u1eddi)<\/td>\n<td>39-0.56 USD m\u1ed7i foot (gi\u00e1 s\u1ec9 1000 feet \u1edf m\u1ee9c th\u1ea5p)<\/td>\n<\/tr>\n<tr>\n<td>C\u00e1p 12\/2 NM-B (ki\u1ec3u Romex, c\u00f3 d\u00e2y n\u1ed1i \u0111\u1ea5t)<\/td>\n<td>50-0.80 USD m\u1ed7i foot<\/td>\n<\/tr>\n<tr>\n<td>C\u00e1p 12\/3 NM-B (cho m\u1ea1ch 3 chi\u1ec1u, c\u00f3 d\u00e2y n\u1ed1i \u0111\u1ea5t)<\/td>\n<td>70-1.10 USD m\u1ed7i foot<\/td>\n<\/tr>\n<tr>\n<td>Cu\u1ed9n d\u00e2y 12 AWG NM-B, 100 feet<\/td>\n<td>$20-35<\/td>\n<\/tr>\n<tr>\n<td>Cu\u1ed9n d\u00e2y 12 AWG NM-B, 250-500 feet (s\u1ec9)<\/td>\n<td>50-170 USD t\u00f9y th\u01b0\u01a1ng hi\u1ec7u v\u00e0 gi\u00e1 \u0111\u1ed3ng<\/td>\n<\/tr>\n<tr>\n<td>T\u01b0\u01a1ng \u0111\u01b0\u01a1ng 10 AWG 12\/2 NM-B (\u0111\u1ec3 so s\u00e1nh)<\/td>\n<td>kho\u1ea3ng 1.20 USD m\u1ed7i foot<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Mua s\u1ed1 l\u01b0\u1ee3ng l\u1edbn l\u00e0 m\u1ed9t c\u00e1ch tuy\u1ec7t v\u1eddi \u0111\u1ec3 ti\u1ebft ki\u1ec7m ti\u1ec1n: cu\u1ed9n d\u00e2y d\u00e0i 500 feet lo\u1ea1i 12\/2 NM-B t\u1eeb nh\u00e0 b\u00e1n bu\u00f4n c\u00f3 gi\u00e1 th\u1ea5p h\u01a1n t\u1edbi 30% so v\u1edbi gi\u00e1 mua c\u00e1c \u0111o\u1ea1n c\u1eaft d\u00e0i 50 feet t\u1eeb c\u1eeda h\u00e0ng b\u00e1n l\u1ebb. Nhi\u1ec1u nh\u00e0 b\u00e1n bu\u00f4n tr\u1ef1c tuy\u1ebfn (nh\u01b0 Wire &amp; Cable Your Way v\u00e0 WesBell) \u0111\u0103ng gi\u00e1 d\u00e2y tr\u1ef1c tuy\u1ebfn th\u1ea5p h\u01a1n nhi\u1ec1u so v\u1edbi c\u00e1c nh\u00e0 b\u00e1n l\u1ebb l\u1edbn truy\u1ec1n th\u1ed1ng cho d\u00e2y UL-\u0111\u0103ng k\u00fd t\u01b0\u01a1ng t\u1ef1.<\/p>\n<h2>Th\u01b0\u01a1ng hi\u1ec7u v\u00e0 nh\u00e0 s\u1ea3n xu\u1ea5t \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb<\/h2>\n<p>D\u00e2y UL-listed \u0111\u01b0\u1ee3c coi l\u00e0 s\u1ea3n ph\u1ea9m mang t\u00ednh h\u00e0ng h\u00f3a do y\u1ebfu t\u1ed1 quan tr\u1ecdng h\u01a1n l\u00e0 l\u1edbp c\u00e1ch \u0111i\u1ec7n v\u00e0 \u0111\u1ed3ng s\u1eed d\u1ee5ng cho d\u00e2y, v\u00e0 t\u1ea5t c\u1ea3 c\u00e1c th\u01b0\u01a1ng hi\u1ec7u h\u00e0ng \u0111\u1ea7u \u0111\u1ec1u tu\u00e2n th\u1ee7 UL 83\/1063. Nh\u01b0ng c\u00f3 m\u1ed9t s\u1ed1 th\u01b0\u01a1ng hi\u1ec7u \u0111\u00e3 kh\u1eb3ng \u0111\u1ecbnh v\u1ecb th\u1ebf trong ng\u00e0nh s\u1ea3n xu\u1ea5t d\u00e2y:<\/p>\n<ul>\n<li>Southwire \u2014 c\u00f4ng ty d\u00e2y l\u1edbn nh\u1ea5t t\u1ea1i M\u1ef9. Th\u01b0\u01a1ng hi\u1ec7u d\u00e2y Romex c\u1ee7a h\u1ecd \u0111\u00e3 tr\u1edf th\u00e0nh ti\u00eau chu\u1ea9n trong d\u00e2y NM-B. N\u00f3 \u0111\u01b0\u1ee3c b\u00e1n t\u1ea1i t\u1ea5t c\u1ea3 c\u00e1c chu\u1ed7i c\u1eeda h\u00e0ng v\u00e0 nh\u00e0 ph\u00e2n ph\u1ed1i d\u00e2y h\u00e0ng \u0111\u1ea7u.<\/li>\n<li>Cerro Wire \u2014 m\u1ed9t c\u00f4ng ty n\u1ed5i ti\u1ebfng t\u1ea1i M\u1ef9. Gi\u00e1 c\u1ee7a h\u1ecd cao h\u01a1n c\u00e1c th\u01b0\u01a1ng hi\u1ec7u kh\u00e1c t\u1eeb 10-15%, nh\u01b0ng cung c\u1ea5p l\u1edbp c\u00e1ch \u0111i\u1ec7n ch\u1ea5t l\u01b0\u1ee3ng cao.<\/li>\n<li>Wire &amp; Cable Your Way \u2014 nh\u00e0 ph\u00e2n ph\u1ed1i b\u00e1n d\u00e2y Southwire v\u00e0 nhi\u1ec1u lo\u1ea1i d\u00e2y t\u01b0\u01a1ng t\u1ef1 v\u1edbi gi\u00e1 th\u1ea5p.<\/li>\n<li>WesBell Electronics \u2014 c\u00f4ng ty chuy\u00ean v\u1ec1 b\u00e1n h\u00e0ng tr\u1ef1c ti\u1ebfp v\u00e0 cung c\u1ea5p d\u00e2y THHN theo \u0111\u01a1n v\u1ecb feet.<\/li>\n<li>General Cable\/Prysmian \u2014 nh\u00e0 s\u1ea3n xu\u1ea5t d\u00e2y c\u00f4ng nghi\u1ec7p THHN v\u00e0 d\u00e2y khay.<\/li>\n<\/ul>\n<p>Khi mua d\u00e2y, h\u00e3y ch\u1eafc ch\u1eafn ki\u1ec3m tra ch\u1ee7 t\u1ecbch UL, v\u00e0 c\u00e1c k\u00fd hi\u1ec7u tr\u00ean d\u00e2y (12-2 w\/Grd NM-B 600V), m\u00e3 ng\u00e0y s\u1ea3n xu\u1ea5t tr\u00ean cu\u1ed9n NM-B, v\u00e0 \u0111\u1ea3m b\u1ea3o d\u00e2y \u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u ch\u00ednh x\u00e1c. Ch\u00eanh l\u1ec7ch gi\u00e1 gi\u1eefa d\u00e2y gi\u00e1 r\u1ebb v\u00e0 d\u00e2y cao c\u1ea5p ch\u1ec9 v\u00e0i \u0111\u00f4 la. \u0110\u1ed1i v\u1edbi b\u1ed9 ng\u1eaft b\u1ea3o v\u1ec7 d\u00e2y \u0111\u00f3, k\u1ebft h\u1ee3p v\u1edbi b\u1ed9 ng\u1eaft \u0111\u01b0\u1ee3c ch\u1ee9ng nh\u1eadn <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/what-is-ul-489-breakers\/\">b\u1ed9 ng\u1eaft UL 489<\/a> v\u00e0 hi\u1ec3u bi\u1ebft <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/how-to-tell-if-a-breaker-is-bad\/\">c\u00e1ch nh\u1eadn bi\u1ebft b\u1ed9 ng\u1eaft b\u1ecb h\u1ecfng<\/a> ho\u00e0n thi\u1ec7n v\u00f2ng l\u1eb7p an to\u00e0n cho m\u1ea1ch, v\u00e0 \u1edf nh\u1eefng n\u01a1i \u1ea9m \u01b0\u1edbt <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/gfci-stands-for-ground-fault-circuit-interrupter\/\">H\u01b0\u1edbng d\u1eabn b\u1ea3o v\u1ec7 GFCI<\/a> gi\u1ea3i th\u00edch l\u1edbp b\u1ed5 sung m\u00e0 m\u1ea1ch 12 AWG c\u1ea7n trong nh\u00e0 b\u1ebfp v\u00e0 ph\u00f2ng t\u1eafm.<\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<h3>D\u00e2y #12 c\u00f3 th\u1ec3 mang bao nhi\u00eau ampe?<\/h3>\n<p>Theo B\u1ea3ng NEC 310.15(B)(16), \u0111\u1ed3ng 12 AWG c\u00f3 th\u1ec3 mang d\u00f2ng \u0111i\u1ec7n 25A \u1edf 75 \u0111\u1ed9 C (THHN\/THWN trong \u1ed1ng d\u1eabn) v\u00e0 30A \u1edf 90 \u0111\u1ed9 C. Tuy nhi\u00ean, NEC 240.4(D) quy \u0111\u1ecbnh r\u1eb1ng trong h\u1ea7u h\u1ebft c\u00e1c \u1ee9ng d\u1ee5ng, n\u00f3 ph\u1ea3i \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 kh\u00f4ng qu\u00e1 20A v\u00ec c\u00e1p NM-B v\u00e0 \u0111\u1ea7u n\u1ed1i ti\u00eau chu\u1ea9n \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 cho 60 \u0111\u1ed9 C. K\u1ebft qu\u1ea3 th\u1ef1c t\u1ebf cho thi\u1ebft k\u1ebf m\u1ea1ch l\u00e0: 12 AWG t\u01b0\u01a1ng \u0111\u01b0\u01a1ng m\u1ea1ch 20 ampe.<\/p>\n<h3>D\u00e2y \u0111i\u1ec7n 12 gauge d\u00e0y bao nhi\u00eau?<\/h3>\n<p>\u0110\u01b0\u1eddng k\u00ednh d\u00e2y \u0111\u1ed3ng tr\u1ea7n 12 AWG l\u00e0 0,0808 inch (2,05 mm). \u0110\u01b0\u1eddng k\u00ednh d\u00e2y c\u00f3 l\u1edbp c\u00e1ch \u0111i\u1ec7n THHN kho\u1ea3ng 0,128 inch (3,25 mm) v\u00e0 to\u00e0n b\u1ed9 b\u1ed9 d\u00e2y NM-B kho\u1ea3ng 0,4 x 0,2 inch. N\u00f3 r\u00f5 r\u00e0ng d\u00e0y h\u01a1n 14 AWG (0,0641\u2033) v\u00e0 m\u1ecfng h\u01a1n \u0111\u00e1ng k\u1ec3 so v\u1edbi 10 AWG (0,1019\u2033).<\/p>\n<h3>12 gauge v\u00e0 12 AWG c\u00f3 ph\u1ea3i l\u00e0 c\u00f9ng m\u1ed9t th\u1ee9 kh\u00f4ng?<\/h3>\n<p>C\u00f3, AWG c\u00f3 ngh\u0129a l\u00e0 American Wire Gauge v\u00e0 kh\u00f4ng c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa 12 AWG v\u00e0 12 gauge. \u0110\u00e2y l\u00e0 h\u1ec7 th\u1ed1ng nh\u1eadn d\u1ea1ng k\u00edch th\u01b0\u1edbc d\u00e2y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u1edf B\u1eafc M\u1ef9. C\u1ea3 hai thu\u1eadt ng\u1eef \u0111\u1ec1u d\u00f9ng \u0111\u1ec3 m\u00f4 t\u1ea3 d\u00e2y \u0111\u1ed3ng c\u00f3 \u0111\u01b0\u1eddng k\u00ednh 0,0808 inch v\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu t\u1ea3i m\u1ea1ch 20A (C\u1ea7n l\u01b0u \u00fd r\u1eb1ng \u1edf m\u1ed9t s\u1ed1 qu\u1ed1c gia, di\u1ec7n t\u00edch m\u1eb7t c\u1eaft ngang c\u1ee7a d\u00e2y \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng mm2 \u2013 12 AWG kho\u1ea3ng 3,3-4 mm2).<\/p>\n<h3>C\u00f3 th\u1ec3 ch\u1ea1y 25 ampe tr\u00ean d\u00e2y 12 gauge kh\u00f4ng?<\/h3>\n<p>Kh\u00f4ng, \u0111i\u1ec1u \u0111\u00f3 kh\u00f4ng th\u1ec3 \u0111\u1ed1i v\u1edbi c\u00e1c m\u1ea1ch nh\u00e1nh th\u00f4ng th\u01b0\u1eddng. M\u1eb7c d\u00f9 12 AWG THHN \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 cho 25 ampe \u1edf 75 \u0111\u1ed9 C, NEC 240.4(D) gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n cho d\u00e2y \u0111\u00f3 l\u00e0 20A \u0111\u1ed1i v\u1edbi d\u00e2y \u0111\u1ed3ng v\u00e0 20A \u0111\u1ed1i v\u1edbi d\u00e2y 12 AWG c\u00f3 l\u1edbp c\u00e1ch \u0111i\u1ec7n ch\u1ecbu nhi\u1ec7t 60 \u0111\u1ed9 C trong h\u1ea7u h\u1ebft c\u00e1c tr\u01b0\u1eddng h\u1ee3p.<\/p>\n<h2>T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h2>\n<ul>\n<li><a href=\"https:\/\/wesbellwireandcable.com\/products\/electrical-wire\/thhn-wire\/copper-thhn-electrical-wire-12-str\/\" rel=\"nofollow noopener\" target=\"_blank\">WesBell Electronics \u2014 THHN 12 AWG d\u00e2y \u0111\u1ed3ng b\u1ec7n: th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u00e0 gi\u00e1 c\u1ea3<\/a><\/li>\n<li><a href=\"https:\/\/www.lapptannehill.com\/thhn-building-wire-12-awg-brown-stranded-conductor\" rel=\"nofollow noopener\" target=\"_blank\">Lapp Tannehill \u2014 d\u1eef li\u1ec7u k\u1ef9 thu\u1eadt d\u00e2y x\u00e2y d\u1ef1ng 12 AWG THHN<\/a><\/li>\n<li><a href=\"https:\/\/toolsradar.com\/12-gauge-wire-for-20-amp-can-it-handle-your-woodshops-needs\/\" rel=\"nofollow noopener\" target=\"_blank\">ToolsRadar \u2014 d\u00e2y 12 gauge cho m\u1ea1ch 20 ampe: ph\u00e2n t\u00edch c\u00f4ng su\u1ea5t v\u00e0 chi ph\u00ed<\/a><\/li>\n<li><a href=\"https:\/\/th.qlcables.com\/message?product_id=1576\" rel=\"nofollow noopener\" target=\"_blank\">QL Cables \u2014 gi\u00e1 NM-B 14-6 AWG v\u00e0 t\u1ed5ng quan tu\u00e2n th\u1ee7 NEC<\/a><\/li>\n<li><a href=\"https:\/\/www.nfpa.org\/codes-and-standards\/nfpa-70\" rel=\"nofollow noopener\" target=\"_blank\">NFPA 70 \u2014 M\u00e3 \u0111i\u1ec7n qu\u1ed1c gia (NEC 240.4, B\u1ea3ng 310.15(B)(16), \u0110i\u1ec1u 210)<\/a><\/li>\n<\/ul>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>D\u00e2y 12 AWG n\u1ed5i ti\u1ebfng l\u00e0 d\u00e2y c\u00f3 hi\u1ec7u su\u1ea5t d\u1eabn \u0111i\u1ec7n t\u1ed1t nh\u1ea5t, ph\u00f9 h\u1ee3p \u0111\u1ec3 h\u1ed7 tr\u1ee3 c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n kh\u00e1c nhau nh\u01b0 d\u1ee5ng c\u1ee5, thi\u1ebft b\u1ecb n\u1ea5u \u0103n v\u00e0 nhi\u1ec1u h\u01a1n n\u1eefa. Ho\u1ea1t \u0111\u1ed9ng c\u1ee7a n\u00f3 d\u1ef1a tr\u00ean c\u00e1c nguy\u00ean t\u1eafc sau \u2014 d\u00e2y c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu t\u1ea3i t\u1ed1i \u0111a 25 ampe \u1edf 75 \u0111\u1ed9 C, nh\u01b0ng b\u1ed9 ng\u1eaft m\u1ea1ch th\u00f4ng th\u01b0\u1eddng l\u00e0 20 ampe. Khi mua d\u00e2y, c\u00e1c y\u1ebfu t\u1ed1 nh\u01b0 lo\u1ea1i c\u00e1ch \u0111i\u1ec7n (NM-B trong tr\u01b0\u1eddng h\u1ee3p nh\u00e0 \u1edf d\u00e2n d\u1ee5ng, THHN trong tr\u01b0\u1eddng h\u1ee3p d\u00e2y d\u1eabn trong \u1ed1ng), chi\u1ec1u d\u00e0i d\u00e2y v\u00e0 v\u1eadt li\u1ec7u (\u0111\u1ed3ng n\u00ean \u0111\u01b0\u1ee3c \u01b0u ti\u00ean h\u01a1n nh\u00f4m) tr\u1edf n\u00ean r\u1ea5t quan tr\u1ecdng. Cu\u1ed1i c\u00f9ng, v\u1edbi gi\u00e1 dao \u0111\u1ed9ng t\u1eeb kho\u1ea3ng $0,40 \u0111\u1ebfn $0,80 m\u1ed7i foot, vi\u1ec7c s\u1eed d\u1ee5ng 12 AWG trong d\u1ef1 \u00e1n c\u1ee7a b\u1ea1n l\u00e0 m\u1ed9t nhi\u1ec7m v\u1ee5 \u0111\u01a1n gi\u1ea3n v\u1ec1 m\u1eb7t ng\u00e2n s\u00e1ch.<\/p>","protected":false},"excerpt":{"rendered":"<p>If you ask any electrician what the most versatile wire is in a residential or light commercial installation, the answer will almost always be the same: 12 AWG (12 gauge). Indeed, it is the smallest cable permitted by the National Electric Code for 20-amp branch circuits; this is, the branch circuits supplying most of the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4042,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-4037","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/4037","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/comments?post=4037"}],"version-history":[{"count":3,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/4037\/revisions"}],"predecessor-version":[{"id":4044,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/4037\/revisions\/4044"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/media\/4042"}],"wp:attachment":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/media?parent=4037"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/categories?post=4037"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/tags?post=4037"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}