{"id":23338,"date":"2026-03-31T23:32:53","date_gmt":"2026-03-31T15:32:53","guid":{"rendered":"https:\/\/viox.com\/?p=23338"},"modified":"2026-03-31T23:32:56","modified_gmt":"2026-03-31T15:32:56","slug":"us-low-voltage-circuit-breaker-standards-explained-ul-489-ul-1066-nema-ab-and-nec","status":"publish","type":"post","link":"https:\/\/test.viox.com\/vi\/us-low-voltage-circuit-breaker-standards-explained-ul-489-ul-1066-nema-ab-and-nec\/","title":{"rendered":"Gi\u1ea3i th\u00edch v\u1ec1 c\u00e1c ti\u00eau chu\u1ea9n c\u1ea7u dao \u0111i\u1ec7n h\u1ea1 th\u1ebf c\u1ee7a Hoa K\u1ef3: ANSI, IEEE, NEMA, UL, NEC, UL 489, UL 1066, NEMA AB v\u00e0 IEEE C37"},"content":{"rendered":"<div class=\"product-intro\">\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Engineer-reviewing-low-voltage-circuit-breaker-standards-in-front-of-switchgear-and-distribution-equipment.webp\" alt=\"Engineer reviewing low-voltage circuit breaker standards in front of switchgear and distribution equipment\" \/><figcaption style=\"font-style: italic; margin-top: 10px; color: #555;\">M\u1ed9t k\u1ef9 s\u01b0 \u0111ang xem x\u00e9t c\u00e1c ti\u00eau chu\u1ea9n v\u00e0 t\u00e0i li\u1ec7u v\u1ec1 b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n h\u1ea1 th\u1ebf c\u1ee7a Hoa K\u1ef3 trong m\u1ed9t c\u01a1 s\u1edf \u0111\u00f3ng c\u1eaft.<\/figcaption><\/figure>\n<p>N\u1ebfu b\u1ea1n l\u00e0m vi\u1ec7c v\u1edbi b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n h\u1ea1 th\u1ebf \u1edf Hoa K\u1ef3, ph\u1ea7n kh\u00f3 nh\u1ea5t th\u01b0\u1eddng kh\u00f4ng ph\u1ea3i l\u00e0 b\u1ea3n th\u00e2n b\u1ed9 ng\u1eaft m\u1ea1ch. M\u00e0 l\u00e0 t\u00ecm hi\u1ec3u xem ai l\u00e0m g\u00ec trong h\u1ec7 th\u1ed1ng ti\u00eau chu\u1ea9n.<\/p>\n<p>M\u1ecdi ng\u01b0\u1eddi th\u1ea5y nh\u1eefng t\u00ean nh\u01b0:<\/p>\n<ul>\n<li><strong>ANSI<\/strong><\/li>\n<li><strong>IEEE<\/strong><\/li>\n<li><strong>C\u1ea2M<\/strong><\/li>\n<li><strong>UL<\/strong><\/li>\n<li><strong>NFPA<\/strong><\/li>\n<li><strong>UL 489<\/strong><\/li>\n<li><strong>UL 1066<\/strong><\/li>\n<li><strong>NEMA AB<\/strong><\/li>\n<li><strong>IEEE C37<\/strong><\/li>\n<li><strong>NEC<\/strong><\/li>\n<\/ul>\n<p>v\u00e0 cho r\u1eb1ng t\u1ea5t c\u1ea3 ch\u00fang \u0111\u1ec1u l\u00e0m c\u00f9ng m\u1ed9t c\u00f4ng vi\u1ec7c. Kh\u00f4ng ph\u1ea3i v\u1eady. M\u1ed9t s\u1ed1 l\u00e0 \u0111i\u1ec1u ph\u1ed1i vi\u00ean ti\u00eau chu\u1ea9n, m\u1ed9t s\u1ed1 l\u00e0 nh\u00e0 ph\u00e1t tri\u1ec3n ti\u00eau chu\u1ea9n, m\u1ed9t s\u1ed1 l\u00e0 t\u1ed5 ch\u1ee9c ki\u1ec3m tra v\u00e0 ch\u1ee9ng nh\u1eadn, v\u00e0 m\u1ed9t trong s\u1ed1 \u0111\u00f3 l\u00e0 quy t\u1eafc l\u1eafp \u0111\u1eb7t ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 ti\u00eau chu\u1ea9n s\u1ea3n ph\u1ea9m.<\/p>\n<p>C\u00e1ch \u0111\u01a1n gi\u1ea3n nh\u1ea5t \u0111\u1ec3 hi\u1ec3u ch\u00fang l\u00e0:<\/p>\n<ul>\n<li><strong>ANSI<\/strong> l\u00e0 l\u1edbp \u0111i\u1ec1u ph\u1ed1i v\u00e0 ph\u00ea duy\u1ec7t cho Ti\u00eau chu\u1ea9n Qu\u1ed1c gia Hoa K\u1ef3, kh\u00f4ng ph\u1ea3i l\u00e0 t\u1ed5 ch\u1ee9c t\u1ef1 vi\u1ebft m\u1ecdi quy t\u1eafc k\u1ef9 thu\u1eadt v\u1ec1 b\u1ed9 ng\u1eaft m\u1ea1ch.<\/li>\n<li><strong>IEEE<\/strong> v\u00e0 <strong>C\u1ea2M<\/strong> l\u00e0 c\u00e1c \u0111\u01b0\u1eddng d\u1eabn ph\u00e1t tri\u1ec3n ti\u00eau chu\u1ea9n.<\/li>\n<li><strong>UL Standards &amp; Engagement<\/strong> ph\u00e1t tri\u1ec3n c\u00e1c ti\u00eau chu\u1ea9n, trong khi <strong>UL Solutions<\/strong> li\u00ean quan \u0111\u1ebfn ho\u1ea1t \u0111\u1ed9ng ki\u1ec3m tra, \u0111\u00e1nh gi\u00e1 v\u00e0 ch\u1ee9ng nh\u1eadn.<\/li>\n<li><strong>NFPA<\/strong> xu\u1ea5t b\u1ea3n <strong>NEC<\/strong>, v\u00e0 <strong>NEC<\/strong> l\u00e0 quy t\u1eafc l\u1eafp \u0111\u1eb7t, kh\u00f4ng ph\u1ea3i l\u00e0 ti\u00eau chu\u1ea9n li\u1ec7t k\u00ea s\u1ea3n ph\u1ea9m.<\/li>\n<li><strong>UL 489<\/strong> v\u00e0 <strong>NEMA AB 1<\/strong> n\u1eb1m trong th\u1ebf gi\u1edbi b\u1ed9 ng\u1eaft m\u1ea1ch v\u1ecf \u0111\u00fac.<\/li>\n<li><strong>UL 1066<\/strong> v\u00e0 \u0111i\u1ec7n h\u1ea1 th\u1ebf <strong>IEEE \/ ANSI-NEMA C37<\/strong> n\u1eb1m trong th\u1ebf gi\u1edbi b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n h\u1ea1 th\u1ebf.<\/li>\n<\/ul>\n<p>\u0110\u00f3 l\u00e0 khu\u00f4n kh\u1ed5 c\u1ed1t l\u00f5i. Ph\u1ea7n c\u00f2n l\u1ea1i c\u1ee7a b\u00e0i vi\u1ebft n\u00e0y gi\u1ea3i th\u00edch \u00fd ngh\u0129a c\u1ee7a t\u1eebng ph\u1ea7n trong th\u1ef1c t\u1ebf v\u00e0 c\u00e1ch ch\u00fang ph\u00f9 h\u1ee3p v\u1edbi nhau khi l\u1ef1a ch\u1ecdn ho\u1eb7c ch\u1ec9 \u0111\u1ecbnh b\u1ed9 ng\u1eaft m\u1ea1ch tr\u00ean th\u1ecb tr\u01b0\u1eddng Hoa K\u1ef3.<\/p>\n<h2>Nh\u1eefng \u0111i\u1ec3m ch\u00ednh<\/h2>\n<ul>\n<li><strong>ANSI<\/strong> ph\u00ea duy\u1ec7t c\u00e1c quy tr\u00ecnh Ti\u00eau chu\u1ea9n Qu\u1ed1c gia Hoa K\u1ef3; n\u00f3 kh\u00f4ng gi\u1ed1ng nh\u01b0 IEEE, NEMA, UL ho\u1eb7c NEC.<\/li>\n<li><strong>UL 489<\/strong> v\u00e0 <strong>UL 1066<\/strong> kh\u00f4ng ph\u1ea3i l\u00e0 c\u00e1c nh\u00e3n c\u1ea1nh tranh cho c\u00f9ng m\u1ed9t d\u00f2ng b\u1ed9 ng\u1eaft m\u1ea1ch.<\/li>\n<li><strong>UL 489 \/ NEMA AB<\/strong> ch\u1ec9 \u0111\u1ebfn th\u1ebf gi\u1edbi b\u1ed9 ng\u1eaft m\u1ea1ch v\u1ecf \u0111\u00fac.<\/li>\n<li><strong>UL 1066 \/ IEEE C37<\/strong> ch\u1ec9 \u0111\u1ebfn th\u1ebf gi\u1edbi b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n h\u1ea1 th\u1ebf.<\/li>\n<li><strong>NFPA 70 (NEC)<\/strong> chi ph\u1ed1i vi\u1ec7c l\u1eafp \u0111\u1eb7t v\u00e0 \u1ee9ng d\u1ee5ng, trong khi c\u00e1c t\u00e0i li\u1ec7u UL, NEMA v\u00e0 IEEE chi ph\u1ed1i c\u00e1c lo\u1ea1i s\u1ea3n ph\u1ea9m, k\u1ef3 v\u1ecdng v\u1ec1 c\u1ea5u tr\u00fac, khu\u00f4n kh\u1ed5 ki\u1ec3m tra ho\u1eb7c h\u01b0\u1edbng d\u1eabn li\u00ean quan.<\/li>\n<li><strong>OSHA NRTL<\/strong> l\u00e0 m\u1ed9t khu\u00f4n kh\u1ed5 c\u00f4ng nh\u1eadn theo quy \u0111\u1ecbnh cho c\u00e1c ph\u00f2ng th\u00ed nghi\u1ec7m ki\u1ec3m tra, kh\u00f4ng ph\u1ea3i l\u00e0 ti\u00eau chu\u1ea9n b\u1ed9 ng\u1eaft m\u1ea1ch.<\/li>\n<\/ul>\n<h2>B\u1ea3ng tham kh\u1ea3o nhanh<\/h2>\n<table style=\"border-collapse: collapse; width: 100%; text-align: left;\" border=\"1\">\n<thead>\n<tr>\n<th style=\"padding: 8px;\">T\u00ean<\/th>\n<th style=\"padding: 8px;\">N\u00f3 l\u00e0 g\u00ec<\/th>\n<th style=\"padding: 8px;\">Vai tr\u00f2 \u0111i\u1ec3n h\u00ecnh trong h\u1ec7 sinh th\u00e1i b\u1ed9 ng\u1eaft m\u1ea1ch<\/th>\n<th style=\"padding: 8px;\">\u5b9e\u9645\u542b\u4e49<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 8px;\"><strong>ANSI<\/strong><\/td>\n<td style=\"padding: 8px;\">C\u01a1 quan \u0111i\u1ec1u ph\u1ed1i v\u00e0 ph\u00ea duy\u1ec7t ti\u00eau chu\u1ea9n<\/td>\n<td style=\"padding: 8px;\">Gi\u00e1m s\u00e1t quy tr\u00ecnh \u0111\u1ed3ng thu\u1eadn \u0111\u01b0\u1ee3c ANSI ph\u00ea duy\u1ec7t<\/td>\n<td style=\"padding: 8px;\">X\u00e1c nh\u1eadn quy tr\u00ecnh v\u00e0 s\u1ef1 \u0111\u1ed3ng thu\u1eadn, kh\u00f4ng ph\u1ea3i m\u1ecdi \u0111i\u1ec1u kho\u1ea3n k\u1ef9 thu\u1eadt<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><strong>IEEE<\/strong><\/td>\n<td style=\"padding: 8px;\">T\u1ed5 ch\u1ee9c ph\u00e1t tri\u1ec3n ti\u00eau chu\u1ea9n<\/td>\n<td style=\"padding: 8px;\">\u0110\u01b0\u1eddng d\u1eabn ti\u00eau chu\u1ea9n k\u1ef9 thu\u1eadt, \u0111\u1eb7c bi\u1ec7t trong c\u00e1c d\u00f2ng thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft \u0111i\u1ec7n nh\u01b0 C37<\/td>\n<td style=\"padding: 8px;\">Ngu\u1ed3n k\u1ef9 thu\u1eadt c\u1ed1t l\u00f5i cho nhi\u1ec1u ti\u00eau chu\u1ea9n b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><strong>C\u1ea2M<\/strong><\/td>\n<td style=\"padding: 8px;\">Hi\u1ec7p h\u1ed9i ng\u00e0nh v\u00e0 t\u1ed5 ch\u1ee9c ph\u00e1t tri\u1ec3n ti\u00eau chu\u1ea9n<\/td>\n<td style=\"padding: 8px;\">Xu\u1ea5t b\u1ea3n c\u00e1c ti\u00eau chu\u1ea9n v\u00e0 h\u01b0\u1edbng d\u1eabn li\u00ean quan \u0111\u1ebfn b\u1ed9 ng\u1eaft m\u1ea1ch v\u1ecf \u0111\u00fac v\u00e0 thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft<\/td>\n<td style=\"padding: 8px;\">Ngu\u1ed3n ch\u00ednh cho AB v\u00e0 m\u1ed9t s\u1ed1 t\u00e0i li\u1ec7u ANSI\/NEMA C37<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><strong>UL Standards &amp; Engagement \/ UL Solutions<\/strong><\/td>\n<td style=\"padding: 8px;\">Ph\u00e1t tri\u1ec3n ti\u00eau chu\u1ea9n c\u1ed9ng v\u1edbi h\u1ec7 sinh th\u00e1i ki\u1ec3m tra\/ch\u1ee9ng nh\u1eadn<\/td>\n<td style=\"padding: 8px;\">Ti\u00eau chu\u1ea9n s\u1ea3n ph\u1ea9m v\u00e0 khu\u00f4n kh\u1ed5 \u0111\u00e1nh gi\u00e1 s\u1ea3n ph\u1ea9m<\/td>\n<td style=\"padding: 8px;\">Tr\u1ecdng t\u00e2m c\u1ee7a c\u00e1c cu\u1ed9c th\u1ea3o lu\u1eadn v\u1ec1 danh s\u00e1ch v\u00e0 ch\u1ee9ng nh\u1eadn s\u1ea3n ph\u1ea9m<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><strong>NFPA \/ NEC<\/strong><\/td>\n<td style=\"padding: 8px;\">Nh\u00e0 xu\u1ea5t b\u1ea3n quy t\u1eafc v\u00e0 quy t\u1eafc l\u1eafp \u0111\u1eb7t<\/td>\n<td style=\"padding: 8px;\">Thi\u1ebft k\u1ebf, l\u1eafp \u0111\u1eb7t v\u00e0 ki\u1ec3m tra t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng<\/td>\n<td style=\"padding: 8px;\">Chi ph\u1ed1i c\u00e1ch \u00e1p d\u1ee5ng c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><strong>OSHA NRTL<\/strong><\/td>\n<td style=\"padding: 8px;\">Ch\u01b0\u01a1ng tr\u00ecnh c\u00f4ng nh\u1eadn c\u1ee7a ch\u00ednh ph\u1ee7<\/td>\n<td style=\"padding: 8px;\">C\u00f4ng nh\u1eadn c\u00e1c ph\u00f2ng th\u00ed nghi\u1ec7m ki\u1ec3m tra khu v\u1ef1c t\u01b0 nh\u00e2n cho m\u1ed9t s\u1ed1 ch\u1ee9ng nh\u1eadn s\u1ea3n ph\u1ea9m nh\u1ea5t \u0111\u1ecbnh<\/td>\n<td style=\"padding: 8px;\">L\u1edbp c\u00f4ng nh\u1eadn theo quy \u0111\u1ecbnh, kh\u00f4ng ph\u1ea3i l\u00e0 ti\u00eau chu\u1ea9n s\u1ea3n ph\u1ea9m<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>M\u00f4 h\u00ecnh t\u01b0 duy nhanh<\/h2>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Technical-infographic-showing-the-relationship-between-ANSI-IEEE-NEMA-UL-NEC-and-OSHA-NRTL.webp\" alt=\"Technical infographic showing the relationship between ANSI, IEEE, NEMA, UL, NEC, and OSHA NRTL\" \/><figcaption style=\"font-style: italic; margin-top: 10px; color: #555;\">H\u01b0\u1edbng d\u1eabn tr\u1ef1c quan chi ti\u1ebft m\u1ed1i quan h\u1ec7 t\u01b0\u01a1ng h\u1ed7 gi\u1eefa c\u00e1c t\u1ed5 ch\u1ee9c ti\u00eau chu\u1ea9n \u0111i\u1ec7n l\u1edbn c\u1ee7a Hoa K\u1ef3 nh\u01b0 ANSI, IEEE, UL v\u00e0 NEC.<\/figcaption><\/figure>\n<p>Khi c\u00e1c ti\u00eau chu\u1ea9n b\u1ed9 ng\u1eaft m\u1ea1ch c\u1ee7a Hoa K\u1ef3 c\u00f3 v\u1ebb h\u1ed7n lo\u1ea1n, h\u1ec7 th\u1ed1ng ph\u00e2n c\u1ea5p \u0111\u01a1n gi\u1ea3n h\u00f3a n\u00e0y th\u01b0\u1eddng h\u1eefu \u00edch:<\/p>\n<ul>\n<li><strong>ANSI<\/strong> ph\u00ea duy\u1ec7t quy tr\u00ecnh \u0111\u1ed3ng thu\u1eadn<\/li>\n<li><strong>IEEE<\/strong>, <strong>C\u1ea2M<\/strong>, <strong>UL Standards &amp; Engagement<\/strong>, V\u00e0 <strong>NFPA<\/strong> ph\u00e1t tri\u1ec3n c\u00e1c ti\u00eau chu\u1ea9n ho\u1eb7c quy t\u1eafc trong c\u00e1c l\u0129nh v\u1ef1c ri\u00eang c\u1ee7a h\u1ecd<\/li>\n<li><strong>UL Solutions<\/strong> v\u00e0 c\u00e1c c\u01a1 quan \u0111\u01b0\u1ee3c c\u00f4ng nh\u1eadn kh\u00e1c \u0111\u00e1nh gi\u00e1 s\u1ea3n ph\u1ea9m theo c\u00e1c ti\u00eau chu\u1ea9n hi\u1ec7n h\u00e0nh<\/li>\n<li><strong>OSHA NRTL<\/strong> c\u00f4ng nh\u1eadn c\u00e1c ph\u00f2ng th\u00ed nghi\u1ec7m cho c\u00e1c ph\u1ea1m vi ch\u1ee9ng nh\u1eadn \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh<\/li>\n<li><strong>NEC (NFPA 70)<\/strong> cho b\u1ea1n bi\u1ebft thi\u1ebft b\u1ecb ph\u1ea3i \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t v\u00e0 \u00e1p d\u1ee5ng nh\u01b0 th\u1ebf n\u00e0o<\/li>\n<\/ul>\n<p>Khi c\u1ea5u tr\u00fac \u0111\u00f3 \u0111\u00e3 r\u00f5 r\u00e0ng, vi\u1ec7c \u00e1nh x\u1ea1 d\u00f2ng b\u1ed9 ng\u1eaft m\u1ea1ch tr\u1edf n\u00ean d\u1ec5 d\u00e0ng h\u01a1n:<\/p>\n<ul>\n<li><strong>UL 489 \/ NEMA AB<\/strong> ch\u1ec9 \u0111\u1ebfn th\u1ef1c h\u00e0nh b\u1ed9 ng\u1eaft m\u1ea1ch v\u1ecf \u0111\u00fac<\/li>\n<li><strong>UL 1066 \/ IEEE C37<\/strong> \u0111\u1ec1 c\u1eadp \u0111\u1ebfn th\u1ef1c h\u00e0nh v\u1ec1 m\u00e1y c\u1eaft \u0111i\u1ec7n h\u1ea1 th\u1ebf v\u00e0 thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft<\/li>\n<\/ul>\n<h2>Ai l\u00e0m g\u00ec trong c\u1ea5u tr\u00fac ti\u00eau chu\u1ea9n Hoa K\u1ef3<\/h2>\n<p>Tr\u01b0\u1edbc khi so s\u00e1nh c\u00e1c t\u00e0i li\u1ec7u c\u1ee5 th\u1ec3 v\u1ec1 m\u00e1y c\u1eaft, vi\u1ec7c ph\u00e2n t\u00e1ch c\u00e1c t\u1ed5 ch\u1ee9c s\u1ebd h\u1eefu \u00edch.<\/p>\n<h3>ANSI<\/h3>\n<p><strong>ANSI<\/strong> l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a <strong>Vi\u1ec7n Ti\u00eau chu\u1ea9n Qu\u1ed1c gia Hoa K\u1ef3<\/strong>. Vai tr\u00f2 c\u1ee7a n\u00f3 l\u00e0 \u0111i\u1ec1u ph\u1ed1i v\u00e0 ph\u00ea duy\u1ec7t. ANSI kh\u00f4ng t\u1ef1 m\u00ecnh vi\u1ebft m\u1ecdi ti\u00eau chu\u1ea9n v\u1ec1 m\u00e1y c\u1eaft m\u00e0 c\u00e1c k\u1ef9 s\u01b0 s\u1eed d\u1ee5ng. Thay v\u00e0o \u0111\u00f3, n\u00f3 ph\u00ea duy\u1ec7t c\u00e1c quy tr\u00ecnh ti\u00eau chu\u1ea9n v\u00e0 c\u00f4ng nh\u1eadn c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n ti\u00eau chu\u1ea9n c\u00f3 th\u1ec3 \u0111\u01b0a c\u00e1c t\u00e0i li\u1ec7u l\u00ean th\u00e0nh Ti\u00eau chu\u1ea9n Qu\u1ed1c gia Hoa K\u1ef3.<\/p>\n<p>V\u1ec1 m\u1eb7t th\u1ef1c t\u1ebf, ANSI l\u00e0 l\u1edbp quy tr\u00ecnh v\u00e0 \u0111\u1ed3ng thu\u1eadn.<\/p>\n<h3>IEEE<\/h3>\n<p><strong>IEEE<\/strong> l\u00e0 <strong>Vi\u1ec7n K\u1ef9 s\u01b0 \u0110i\u1ec7n v\u00e0 \u0110i\u1ec7n t\u1eed<\/strong>. Trong l\u0129nh v\u1ef1c m\u00e1y c\u1eaft, IEEE l\u00e0 m\u1ed9t con \u0111\u01b0\u1eddng ti\u00eau chu\u1ea9n k\u1ef9 thu\u1eadt l\u1edbn, \u0111\u1eb7c bi\u1ec7t l\u00e0 th\u00f4ng qua <strong>h\u1ecd C37<\/strong> \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong b\u1ed1i c\u1ea3nh thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft \u0111i\u1ec7n v\u00e0 m\u00e1y c\u1eaft \u0111i\u1ec7n.<\/p>\n<p>V\u1ec1 m\u1eb7t th\u1ef1c t\u1ebf, IEEE l\u00e0 m\u1ed9t t\u1ed5 ch\u1ee9c vi\u1ebft ti\u00eau chu\u1ea9n k\u1ef9 thu\u1eadt.<\/p>\n<h3>C\u1ea2M<\/h3>\n<p><strong>C\u1ea2M<\/strong> l\u00e0 <strong>National Electrical Manufacturers Association (Hi\u1ec7p h\u1ed9i c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t \u0111i\u1ec7n qu\u1ed1c gia)<\/strong>. N\u00f3 v\u1eeba l\u00e0 m\u1ed9t hi\u1ec7p h\u1ed9i ng\u00e0nh v\u1eeba l\u00e0 m\u1ed9t nh\u00e0 ph\u00e1t tri\u1ec3n ti\u00eau chu\u1ea9n \u0111\u01b0\u1ee3c ANSI c\u00f4ng nh\u1eadn. Trong c\u00f4ng vi\u1ec7c v\u1ec1 m\u00e1y c\u1eaft \u0111i\u1ec7n h\u1ea1 th\u1ebf, n\u00f3 quan tr\u1ecdng v\u00ec n\u00f3 xu\u1ea5t b\u1ea3n <strong>NEMA AB<\/strong> h\u1ecd cho m\u00e1y c\u1eaft v\u1ecf \u0111\u00fac v\u00e0 c\u0169ng tham gia v\u00e0o c\u00e1c ph\u1ea7n c\u1ee7a <strong>C37<\/strong> b\u1ed1i c\u1ea3nh ti\u00eau chu\u1ea9n thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft.<\/p>\n<p>V\u1ec1 m\u1eb7t th\u1ef1c t\u1ebf, NEMA v\u1eeba l\u00e0 m\u1ed9t c\u01a1 quan ng\u00e0nh v\u1eeba l\u00e0 m\u1ed9t nh\u00e0 xu\u1ea5t b\u1ea3n ti\u00eau chu\u1ea9n t\u00edch c\u1ef1c.<\/p>\n<h3>UL<\/h3>\n<p>T\u00ean <strong>UL<\/strong> th\u01b0\u1eddng g\u00e2y ra nhi\u1ec1u nh\u1ea7m l\u1eabn nh\u1ea5t v\u00ec m\u1ecdi ng\u01b0\u1eddi s\u1eed d\u1ee5ng n\u00f3 \u0111\u1ec3 ch\u1ec9 c\u1ea3 vi\u1ec7c vi\u1ebft ti\u00eau chu\u1ea9n v\u00e0 ch\u1ee9ng nh\u1eadn s\u1ea3n ph\u1ea9m.<\/p>\n<p>\u1ede c\u1ea5p \u0111\u1ed9 cao:<\/p>\n<ul>\n<li><strong>UL Standards &amp; Engagement<\/strong> \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi ph\u00e1t tri\u1ec3n ti\u00eau chu\u1ea9n<\/li>\n<li><strong>UL Solutions<\/strong> \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi ho\u1ea1t \u0111\u1ed9ng th\u1eed nghi\u1ec7m, \u0111\u00e1nh gi\u00e1 v\u00e0 ch\u1ee9ng nh\u1eadn<\/li>\n<\/ul>\n<p>V\u00ec v\u1eady, khi c\u00e1c k\u1ef9 s\u01b0 n\u00f3i \u201c\u0111\u00e2y l\u00e0 m\u00e1y c\u1eaft UL\u201d, h\u1ecd th\u01b0\u1eddng th\u1ef1c s\u1ef1 c\u00f3 ngh\u0129a l\u00e0 m\u00e1y c\u1eaft \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 theo ti\u00eau chu\u1ea9n s\u1ea3n ph\u1ea9m UL nh\u01b0 <strong>UL 489<\/strong> hay <strong>UL 1066<\/strong> b\u1edfi m\u1ed9t t\u1ed5 ch\u1ee9c ch\u1ee9ng nh\u1eadn \u0111\u01b0\u1ee3c c\u00f4ng nh\u1eadn.<\/p>\n<h3>NFPA v\u00e0 NEC<\/h3>\n<p><strong>NFPA<\/strong> l\u00e0 <strong>Hi\u1ec7p h\u1ed9i Ph\u00f2ng ch\u00e1y ch\u1eefa ch\u00e1y Qu\u1ed1c gia<\/strong>. N\u00f3 xu\u1ea5t b\u1ea3n <strong>NFPA 70<\/strong>, \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn nhi\u1ec1u h\u01a1n v\u1edbi t\u00ean g\u1ecdi <strong>NEC<\/strong>, ho\u1eb7c Quy t\u1eafc \u0110i\u1ec7n Qu\u1ed1c gia.<\/p>\n<p>\u0110i\u1ec1u quan tr\u1ecdng c\u1ea7n nh\u1edb l\u00e0:<\/p>\n<ul>\n<li><strong>NFPA<\/strong> l\u00e0 nh\u00e0 xu\u1ea5t b\u1ea3n<\/li>\n<li><strong>NEC<\/strong> l\u00e0 t\u00e0i li\u1ec7u quy t\u1eafc<\/li>\n<\/ul>\n<h3>OSHA NRTL<\/h3>\n<p>Nh\u1eefng <strong>Ch\u01b0\u01a1ng tr\u00ecnh OSHA NRTL<\/strong> kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t ph\u00f2ng th\u00ed nghi\u1ec7m v\u00e0 kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t ti\u00eau chu\u1ea9n m\u00e1y c\u1eaft. N\u00f3 l\u00e0 m\u1ed9t khu\u00f4n kh\u1ed5 c\u00f4ng nh\u1eadn c\u1ee7a ch\u00ednh ph\u1ee7 d\u00e0nh cho c\u00e1c ph\u00f2ng th\u00ed nghi\u1ec7m khu v\u1ef1c t\u01b0 nh\u00e2n ch\u1ee9ng nh\u1eadn s\u1ea3n ph\u1ea9m trong ph\u1ea1m vi \u0111\u01b0\u1ee3c c\u00f4ng nh\u1eadn c\u1ee5 th\u1ec3.<\/p>\n<p>\u0110i\u1ec1u \u0111\u00f3 quan tr\u1ecdng trong c\u00e1c cu\u1ed9c th\u1ea3o lu\u1eadn v\u1ec1 tu\u00e2n th\u1ee7 v\u00ec th\u1ecb tr\u01b0\u1eddng th\u01b0\u1eddng n\u00f3i nh\u01b0 th\u1ec3 \u201cUL\u201d l\u00e0 con \u0111\u01b0\u1eddng ch\u1ee9ng nh\u1eadn duy nh\u1ea5t. Tr\u00ean th\u1ef1c t\u1ebf, logic quy \u0111\u1ecbnh r\u1ed9ng h\u01a1n: OSHA c\u00f4ng nh\u1eadn c\u00e1c ph\u00f2ng th\u00ed nghi\u1ec7m th\u1eed nghi\u1ec7m cho c\u00e1c ph\u1ea1m vi ti\u00eau chu\u1ea9n s\u1ea3n ph\u1ea9m \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh.<\/p>\n<h2>T\u1ea1i sao c\u00e1c ti\u00eau chu\u1ea9n n\u00e0y b\u1ecb nh\u1ea7m l\u1eabn<\/h2>\n<p>S\u1ef1 nh\u1ea7m l\u1eabn th\u01b0\u1eddng x\u1ea3y ra v\u00ec m\u1ed9t trong ba l\u00fd do:<\/p>\n<h3>1. C\u00e1c k\u1ef9 s\u01b0 s\u1eed d\u1ee5ng \u201cti\u00eau chu\u1ea9n m\u00e1y c\u1eaft\u201d \u0111\u1ec3 ch\u1ec9 nh\u1eefng \u0111i\u1ec1u kh\u00e1c nhau<\/h3>\n<p>\u0110\u00f4i khi h\u1ecd c\u00f3 ngh\u0129a l\u00e0:<\/p>\n<ul>\n<li>ti\u00eau chu\u1ea9n li\u1ec7t k\u00ea s\u1ea3n ph\u1ea9m<\/li>\n<li>ti\u00eau chu\u1ea9n x\u00e2y d\u1ef1ng thi\u1ebft b\u1ecb<\/li>\n<li>quy t\u1eafc l\u1eafp \u0111\u1eb7t<\/li>\n<li>h\u01b0\u1edbng d\u1eabn b\u1ea3o tr\u00ec<\/li>\n<\/ul>\n<p>\u0110\u00f3 kh\u00f4ng ph\u1ea3i l\u00e0 c\u00f9ng m\u1ed9t lo\u1ea1i.<\/p>\n<h3>2. UL 489 v\u00e0 UL 1066 \u0111\u1ec1u \u00e1p d\u1ee5ng cho m\u00e1y c\u1eaft \u0111i\u1ec7n h\u1ea1 th\u1ebf<\/h3>\n<p>\u0110i\u1ec1u \u0111\u00f3 l\u00e0m cho ch\u00fang nghe c\u00f3 v\u1ebb t\u01b0\u01a1ng t\u1ef1, nh\u01b0ng ch\u00fang nh\u1eafm \u0111\u1ebfn c\u00e1c h\u1ecd m\u00e1y c\u1eaft kh\u00e1c nhau.<\/p>\n<h3>3. NEMA AB v\u00e0 IEEE C37 \u0111\u1ec1u l\u00e0 chu\u1ed7i, kh\u00f4ng ph\u1ea3i t\u00e0i li\u1ec7u \u0111\u01a1n l\u1ebb<\/h3>\n<p>M\u1ecdi ng\u01b0\u1eddi n\u00f3i \u201cNEMA AB\u201d ho\u1eb7c \u201cIEEE C37\u201d nh\u01b0 th\u1ec3 m\u1ed7i c\u00e1i l\u00e0 m\u1ed9t ti\u00eau chu\u1ea9n. Tr\u00ean th\u1ef1c t\u1ebf, c\u1ea3 hai t\u00ean \u0111\u1ec1u \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u00e1c h\u1ecd ti\u00eau chu\u1ea9n.<\/p>\n<h3>4. NEC b\u1ecb nh\u1ea7m l\u1eabn v\u1edbi ch\u1ee9ng nh\u1eadn<\/h3>\n<p>N\u00f3 kh\u00f4ng ph\u1ea3i. NEC l\u00e0 quy t\u1eafc l\u1eafp \u0111\u1eb7t, kh\u00f4ng ph\u1ea3i danh s\u00e1ch s\u1ea3n ph\u1ea9m.<\/p>\n<h2>UL 489 c\u00f3 ngh\u0129a l\u00e0 g\u00ec<\/h2>\n<p><strong>UL 489<\/strong> l\u00e0 ti\u00eau chu\u1ea9n an to\u00e0n c\u1ed1t l\u00f5i c\u1ee7a Hoa K\u1ef3 m\u00e0 h\u1ea7u h\u1ebft m\u1ecdi ng\u01b0\u1eddi ngh\u0129 \u0111\u1ebfn khi h\u1ecd n\u00f3i v\u1ec1 m\u00e1y c\u1eaft v\u1ecf \u0111\u00fac th\u00f4ng th\u01b0\u1eddng trong c\u00e1c \u1ee9ng d\u1ee5ng nh\u00e1nh v\u00e0 \u0111\u01b0\u1eddng d\u00e2y c\u1ea5p ngu\u1ed3n.<\/p>\n<p>Theo UL Solutions, UL 489 bao g\u1ed3m:<\/p>\n<ul>\n<li>m\u00e1y c\u1eaft v\u1ecf \u0111\u00fac<\/li>\n<li>c\u00f4ng t\u1eafc v\u1ecf \u0111\u00fac<\/li>\n<li>v\u1ecf m\u00e1y c\u1eaft<\/li>\n<\/ul>\n<p>V\u1ec1 m\u1eb7t thi\u1ebft k\u1ebf th\u1ef1c t\u1ebf, \u0111\u00e2y l\u00e0 h\u1ecd ti\u00eau chu\u1ea9n th\u01b0\u1eddng \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi:<\/p>\n<ul>\n<li>m\u00e1y c\u1eaft b\u1ea3ng \u0111i\u1ec7n<\/li>\n<li>nhi\u1ec1u thi\u1ebft b\u1ecb nh\u00e1nh thu nh\u1ecf v\u00e0 v\u1ecf \u0111\u00fac<\/li>\n<li>m\u00e1y c\u1eaft \u0111\u01b0\u1eddng d\u00e2y c\u1ea5p ngu\u1ed3n trong ph\u00e2n ph\u1ed1i \u0111i\u1ec7n h\u1ea1 th\u1ebf \u0111i\u1ec3n h\u00ecnh<\/li>\n<li>c\u1ee5m m\u00e1y c\u1eaft d\u1ef1 ki\u1ebfn \u200b\u200bs\u1ebd \u0111\u00f3ng vai tr\u00f2 l\u00e0 thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng ti\u00eau chu\u1ea9n trong c\u00e1c h\u1ec7 th\u1ed1ng th\u01b0\u01a1ng m\u1ea1i v\u00e0 c\u00f4ng nghi\u1ec7p th\u00f4ng th\u01b0\u1eddng<\/li>\n<\/ul>\n<p>\u0110\u00e2y l\u00e0 l\u00fd do t\u1ea1i sao UL 489 n\u1eb1m g\u1ea7n c\u00e1c h\u1ecd s\u1ea3n ph\u1ea9m m\u00e0 h\u1ea7u h\u1ebft ng\u01b0\u1eddi mua s\u1ebd m\u00f4 t\u1ea3 l\u00e0 <a href=\"https:\/\/test.viox.com\/vi\/mcb\/\">MCB<\/a> v\u00e0 <a href=\"https:\/\/test.viox.com\/vi\/mccb\/\">MCCB<\/a> trong ng\u00f4n ng\u1eef th\u1ecb tr\u01b0\u1eddng, m\u1eb7c d\u00f9 vi\u1ec7c \u00e1nh x\u1ea1 danh m\u1ee5c ch\u00ednh x\u00e1c ph\u1ee5 thu\u1ed9c v\u00e0o thi\u1ebft k\u1ebf s\u1ea3n ph\u1ea9m v\u00e0 \u0111\u01b0\u1eddng d\u1eabn danh s\u00e1ch.<\/p>\n<p>N\u1ebfu b\u1ea1n mu\u1ed1n t\u00ecm hi\u1ec3u v\u1ec1 kh\u00eda c\u1ea1nh d\u00f2ng s\u1ea3n ph\u1ea9m c\u1ee7a ch\u1ee7 \u0111\u1ec1 \u0111\u00f3, <a href=\"https:\/\/test.viox.com\/vi\/full-guide-to-molded-case-circuit-breakers-mccbs\/\">H\u01b0\u1edbng d\u1eabn \u0111\u1ea7y \u0111\u1ee7 v\u1ec1 m\u00e1y c\u1eaft m\u1ea1ch v\u1ecf \u0111\u00fac (MCCB)<\/a> l\u00e0 trang \u0111\u1ed3ng h\u00e0nh ph\u00f9 h\u1ee3p.<\/p>\n<h2>\u00dd ngh\u0129a c\u1ee7a UL 1066<\/h2>\n<p><strong>UL 1066<\/strong> \u00e1p d\u1ee5ng cho <strong>m\u00e1y c\u1eaft \u0111i\u1ec7n h\u1ea1 th\u1ebf AC v\u00e0 DC \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong t\u1ee7 \u0111i\u1ec7n<\/strong>.<\/p>\n<p>\u0110\u00e2y l\u00e0 m\u1ed9t d\u00f2ng m\u00e1y c\u1eaft kh\u00e1c v\u1edbi m\u00e1y c\u1eaft v\u1ecf \u0111\u00fac th\u01b0\u1eddng li\u00ean quan \u0111\u1ebfn UL 489. Trong thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng th\u1ef1c t\u1ebf, UL 1066 li\u00ean quan ch\u1eb7t ch\u1ebd h\u01a1n nhi\u1ec1u \u0111\u1ebfn:<\/p>\n<ul>\n<li>\u0111\u00f3ng c\u1eaft<\/li>\n<li>m\u00e1y c\u1eaft \u0111i\u1ec7n h\u1ea1 th\u1ebf<\/li>\n<li>c\u00e1c \u1ee9ng d\u1ee5ng m\u00e1y c\u1eaft ch\u00ednh v\u00e0 m\u00e1y c\u1eaft li\u00ean k\u1ebft l\u1edbn h\u01a1n<\/li>\n<li>c\u1ee5m m\u00e1y c\u1eaft \u0111i\u1ec7n ki\u1ec3u k\u00e9o ra ho\u1eb7c \u0111\u1eb7t trong t\u1ee7 \u0111i\u1ec7n<\/li>\n<\/ul>\n<p>UL Solutions c\u0169ng l\u01b0u \u00fd m\u1ed9t \u0111i\u1ec3m kh\u00e1c bi\u1ec7t quan tr\u1ecdng v\u1ec1 ch\u1ee9c n\u0103ng: c\u00e1c m\u00e1y c\u1eaft \u0111i\u1ec7n n\u00e0y <strong>kh\u00f4ng nh\u1eb1m m\u1ee5c \u0111\u00edch cung c\u1ea5p b\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng nh\u00e1nh theo y\u00eau c\u1ea7u c\u1ee7a NEC<\/strong> theo c\u00e1ch m\u00e0 m\u00e1y c\u1eaft v\u1ecf \u0111\u00fac UL 489 th\u01b0\u1eddng l\u00e0m.<\/p>\n<p>\u0110\u00f3 l\u00e0 m\u1ed9t trong nh\u1eefng l\u00fd do quan tr\u1ecdng nh\u1ea5t b\u1ea1n kh\u00f4ng n\u00ean t\u00f9y ti\u1ec7n thay th\u1ebf \u201cm\u00e1y c\u1eaft UL 1066\u201d cho \u201cm\u00e1y c\u1eaft UL 489\u201d trong c\u00e1c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt.<\/p>\n<p>\u0110\u1ed1i v\u1edbi b\u1ed1i c\u1ea3nh d\u00f2ng s\u1ea3n ph\u1ea9m, ch\u1ee7 \u0111\u1ec1 n\u00e0y tr\u00f9ng l\u1eb7p t\u1ef1 nhi\u00ean h\u01a1n v\u1edbi <a href=\"https:\/\/test.viox.com\/vi\/acb\/\">Ng\u00e2n h\u00e0ng<\/a> v\u00e0 r\u1ed9ng h\u01a1n <a href=\"https:\/\/test.viox.com\/vi\/complete-guide-to-air-circuit-breakers-acb\/\">H\u01b0\u1edbng d\u1eabn \u0111\u1ea7y \u0111\u1ee7 v\u1ec1 M\u00e1y c\u1eaft kh\u00f4ng kh\u00ed (ACB)<\/a>, v\u00ec \u0111\u00f3 l\u00e0 n\u01a1i m\u00e0 nhi\u1ec1u cu\u1ed9c th\u1ea3o lu\u1eadn v\u1ec1 m\u00e1y c\u1eaft \u0111i\u1ec7n h\u1ea1 th\u1ebf th\u01b0\u1eddng di\u1ec5n ra trong th\u1ef1c t\u1ebf.<\/p>\n<h2>UL 489 so v\u1edbi UL 1066: S\u1ef1 kh\u00e1c bi\u1ec7t th\u1ef1c s\u1ef1<\/h2>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Comparison-infographic-showing-the-differences-between-UL-489-and-UL-1066-breaker-applications.webp\" alt=\"Comparison infographic showing the differences between UL 489 and UL 1066 breaker applications\" \/><figcaption style=\"font-style: italic; margin-top: 10px; color: #555;\">B\u1ea3n \u0111\u1ed3 ch\u00fa th\u00edch so s\u00e1nh c\u00e1c \u1ee9ng d\u1ee5ng c\u1ee7a M\u00e1y c\u1eaft v\u1ecf \u0111\u00fac (UL 489 \/ NEMA AB) so v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng c\u1ee7a M\u00e1y c\u1eaft \u0111i\u1ec7n h\u1ea1 th\u1ebf (UL 1066 \/ IEEE C37).<\/figcaption><\/figure>\n<p>S\u1ef1 kh\u00e1c bi\u1ec7t h\u1eefu \u00edch nh\u1ea5t kh\u00f4ng ph\u1ea3i l\u00e0 \u201cc\u00e1i n\u00e0o t\u1ed1t h\u01a1n\u201d, m\u00e0 l\u00e0 <strong>b\u1ea1n th\u1ef1c s\u1ef1 \u0111ang ch\u1ec9 \u0111\u1ecbnh lo\u1ea1i m\u00e1y c\u1eaft n\u00e0o<\/strong>.<\/p>\n<table style=\"border-collapse: collapse; width: 100%; text-align: left;\" border=\"1\">\n<thead>\n<tr>\n<th style=\"padding: 8px;\">K\u00edch th\u01b0\u1edbc<\/th>\n<th style=\"padding: 8px;\">UL 489<\/th>\n<th style=\"padding: 8px;\">UL 1066<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 8px;\"><strong>D\u00f2ng m\u00e1y c\u1eaft ch\u00ednh<\/strong><\/td>\n<td style=\"padding: 8px;\">D\u00f2ng m\u00e1y c\u1eaft v\u1ecf \u0111\u00fac<\/td>\n<td style=\"padding: 8px;\">D\u00f2ng m\u00e1y c\u1eaft \u0111i\u1ec7n h\u1ea1 th\u1ebf<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><strong>B\u1ed1i c\u1ea3nh l\u1eafp \u0111\u1eb7t \u0111i\u1ec3n h\u00ecnh<\/strong><\/td>\n<td style=\"padding: 8px;\">T\u1ee7 \u0111i\u1ec7n, m\u1ea1ch nh\u00e1nh v\u00e0 m\u1ea1ch c\u1ea5p ngu\u1ed3n, h\u1ec7 th\u1ed1ng ph\u00e2n ph\u1ed1i ti\u00eau chu\u1ea9n<\/td>\n<td style=\"padding: 8px;\">T\u1ee7 \u0111\u00f3ng c\u1eaft, ngu\u1ed3n ch\u00ednh, li\u00ean k\u1ebft, c\u1ee5m ph\u00e2n ph\u1ed1i \u0111i\u1ec7n l\u1edbn h\u01a1n<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><strong>Vai tr\u00f2 b\u1ea3o v\u1ec7<\/strong><\/td>\n<td style=\"padding: 8px;\">Th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng nh\u00e1nh \/ c\u1ea5p ngu\u1ed3n ti\u00eau chu\u1ea9n<\/td>\n<td style=\"padding: 8px;\">\u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m m\u00e1y c\u1eaft \u0111i\u1ec7n trong t\u1ee7 \u0111i\u1ec7n v\u00e0 t\u1ee7 \u0111\u00f3ng c\u1eaft<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><strong>Hi\u1ec7p h\u1ed9i th\u1ecb tr\u01b0\u1eddng \u0111i\u1ec3n h\u00ecnh<\/strong><\/td>\n<td style=\"padding: 8px;\">Ph\u00eda th\u1ecb tr\u01b0\u1eddng MCB \/ MCCB<\/td>\n<td style=\"padding: 8px;\">Ph\u00eda th\u1ecb tr\u01b0\u1eddng m\u00e1y c\u1eaft \u0111i\u1ec7n h\u1ea1 th\u1ebf \/ ACB<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u0110\u00e2y c\u0169ng l\u00e0 l\u00fd do t\u1ea1i sao c\u00e1c k\u1ef9 s\u01b0 n\u00ean c\u1ea9n th\u1eadn khi so s\u00e1nh tr\u1ef1c ti\u1ebfp m\u00e1y c\u1eaft v\u1ecf \u0111\u00fac v\u1edbi m\u00e1y c\u1eaft \u0111i\u1ec7n h\u1ea1 th\u1ebf. Quy tr\u00ecnh ch\u1ee9ng nh\u1eadn, c\u1ea5u tr\u00fac v\u1eadt l\u00fd, k\u1ef3 v\u1ecdng b\u1ea3o tr\u00ec v\u00e0 \u1ee9ng d\u1ee5ng d\u1ef1 ki\u1ebfn kh\u00f4ng gi\u1ed1ng nhau.<\/p>\n<h2>\u00dd ngh\u0129a th\u1ef1c s\u1ef1 c\u1ee7a \u201cNEMA AB\u201d<\/h2>\n<p>M\u1ed9t trong nh\u1eefng l\u00e0m r\u00f5 h\u1eefu \u00edch nh\u1ea5t trong ch\u1ee7 \u0111\u1ec1 n\u00e0y l\u00e0 <strong>NEMA AB kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t ti\u00eau chu\u1ea9n c\u1ea1nh tranh duy nh\u1ea5t so v\u1edbi UL<\/strong>.<\/p>\n<p>\u0110\u00f3 l\u00e0 m\u1ed9t h\u1ecd t\u00e0i li\u1ec7u li\u00ean quan \u0111\u1ebfn nh\u00f3m s\u1ea3n ph\u1ea9m m\u00e1y c\u1eaft v\u1ecf \u0111\u00fac.<\/p>\n<h3>NEMA AB 1<\/h3>\n<p>Trong l\u1ecbch s\u1eed, <strong>NEMA AB 1<\/strong> l\u00e0 t\u00e0i li\u1ec7u s\u1ea3n ph\u1ea9m m\u00e1y c\u1eaft v\u1ecf \u0111\u00fac li\u00ean quan ch\u1eb7t ch\u1ebd nh\u1ea5t \u0111\u1ebfn c\u00f9ng m\u1ed9t d\u00f2ng s\u1ea3n ph\u1ea9m nh\u01b0 <strong>UL 489<\/strong>. Nhi\u1ec1u k\u1ef9 s\u01b0 v\u1eabn \u0111\u1ec1 c\u1eadp \u0111\u1ebfn n\u00f3 v\u00ec c\u00e1c t\u00e0i li\u1ec7u c\u0169, t\u00e0i li\u1ec7u s\u1ea3n ph\u1ea9m v\u00e0 h\u01b0\u1edbng d\u1eabn s\u1eed d\u1ee5ng ng\u00f4n ng\u1eef AB 1 c\u00f9ng v\u1edbi UL 489.<\/p>\n<p>Tuy nhi\u00ean, trong th\u1ef1c t\u1ebf B\u1eafc M\u1ef9 hi\u1ec7n t\u1ea1i, \u0111i\u1ec3m quan tr\u1ecdng h\u01a1n l\u00e0 khung ti\u00eau chu\u1ea9n s\u1ea3n ph\u1ea9m m\u00e1y c\u1eaft v\u1ecf \u0111\u00fac hi\u1ec7n \u0111\u01b0\u1ee3c hi\u1ec3u th\u00f4ng qua <strong>s\u1ef1 li\u00ean k\u1ebft ba b\u00ean UL 489 \/ CSA C22.2 S\u1ed1 5 \/ NMX-J-266-ANCE<\/strong>. V\u00ec v\u1eady, n\u1ebfu b\u1ea1n th\u1ea5y AB 1 \u0111\u01b0\u1ee3c \u0111\u1ec1 c\u1eadp trong t\u00e0i li\u1ec7u c\u0169, h\u00e3y coi n\u00f3 nh\u01b0 m\u1ed9t ph\u1ea7n c\u1ee7a l\u1ecbch s\u1eed ti\u00eau chu\u1ea9n m\u00e1y c\u1eaft v\u1ecf \u0111\u00fac v\u00e0 d\u00f2ng s\u1ea3n ph\u1ea9m, kh\u00f4ng ph\u1ea3i l\u00e0 c\u00e1ch vi\u1ebft t\u1eaft duy nh\u1ea5t hi\u1ec7n t\u1ea1i b\u1ea1n c\u1ea7n d\u1ef1a v\u00e0o.<\/p>\n<h3>NEMA AB 4<\/h3>\n<p>NEMA AB 4 l\u00e0 m\u1ed9t t\u00e0i li\u1ec7u h\u01b0\u1edbng \u0111\u1ebfn b\u1ea3o tr\u00ec. N\u00f3 cung c\u1ea5p h\u01b0\u1edbng d\u1eabn ki\u1ec3m tra v\u00e0 b\u1ea3o tr\u00ec ph\u00f2ng ng\u1eeba m\u00e1y c\u1eaft v\u1ecf \u0111\u00fac \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng th\u01b0\u01a1ng m\u1ea1i v\u00e0 c\u00f4ng nghi\u1ec7p.<\/p>\n<p>\u0110i\u1ec1u \u0111\u00f3 l\u00e0m cho AB 4 h\u1eefu \u00edch cho:<\/p>\n<ul>\n<li>ch\u01b0\u01a1ng tr\u00ecnh b\u1ea3o tr\u00ec<\/li>\n<li>k\u1ef9 thu\u1eadt c\u01a1 s\u1edf<\/li>\n<li>l\u1eadp k\u1ebf ho\u1ea1ch ki\u1ec3m tra m\u00e1y c\u1eaft th\u01b0\u01a1ng m\u1ea1i v\u00e0 c\u00f4ng nghi\u1ec7p<\/li>\n<\/ul>\n<h3>C\u00e1c t\u00e0i li\u1ec7u NEMA AB kh\u00e1c<\/h3>\n<p>Ngo\u00e0i ra c\u00f2n c\u00f3 c\u00e1c t\u00e0i li\u1ec7u d\u00f2ng AB kh\u00e1c, bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>AB 3<\/strong> \u0111\u1ec3 h\u01b0\u1edbng d\u1eabn \u1ee9ng d\u1ee5ng m\u00e1y c\u1eaft v\u1ecf \u0111\u00fac<\/li>\n<li><strong>AB 4<\/strong> \u0111\u1ec3 ki\u1ec3m tra v\u00e0 b\u1ea3o tr\u00ec ph\u00f2ng ng\u1eeba<\/li>\n<li><strong>AB 5<\/strong> \u0111\u1ec3 h\u01b0\u1edbng d\u1eabn ph\u1ed1i h\u1ee3p ch\u1ecdn l\u1ecdc trong h\u1ec7 th\u1ed1ng m\u00e1y c\u1eaft h\u1ea1 th\u1ebf<\/li>\n<\/ul>\n<p>\u0110i\u1ec3m m\u1ea5u ch\u1ed1t l\u00e0 \u201cNEMA AB\u201d n\u00ean \u0111\u01b0\u1ee3c \u0111\u1ecdc l\u00e0 m\u1ed9t <strong>h\u1ecd t\u00e0i li\u1ec7u m\u00e1y c\u1eaft v\u1ecf \u0111\u00fac<\/strong>, kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t nh\u00e3n duy nh\u1ea5t thay th\u1ebf UL, NEC ho\u1eb7c khung ti\u00eau chu\u1ea9n s\u1ea3n ph\u1ea9m ba b\u00ean hi\u1ec7n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong th\u1ef1c t\u1ebf B\u1eafc M\u1ef9 hi\u1ec7n t\u1ea1i.<\/p>\n<h2>V\u1ecb tr\u00ed c\u1ee7a IEEE C37<\/h2>\n<p>N\u1ebfu NEMA AB l\u00e0 ph\u00eda d\u00f2ng m\u00e1y c\u1eaft v\u1ecf \u0111\u00fac c\u1ee7a h\u1ec7 sinh th\u00e1i Hoa K\u1ef3, <strong>IEEE C37<\/strong> l\u00e0 ph\u00eda d\u00f2ng t\u1ee7 \u0111\u00f3ng c\u1eaft \u0111i\u1ec7n h\u1ea1 th\u1ebf v\u00e0 trung th\u1ebf ch\u00ednh.<\/p>\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c cu\u1ed9c th\u1ea3o lu\u1eadn v\u1ec1 m\u00e1y c\u1eaft \u0111i\u1ec7n h\u1ea1 th\u1ebf, c\u00e1c t\u00e0i li\u1ec7u C37 li\u00ean quan nh\u1ea5t th\u01b0\u1eddng bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>IEEE C37.13<\/strong> cho c\u1ea7u dao \u0111i\u1ec7n h\u1ea1 th\u1ebf AC \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong t\u1ee7 \u0111i\u1ec7n<\/li>\n<li><strong>IEEE C37.14<\/strong> cho c\u1ea7u dao \u0111i\u1ec7n h\u1ea1 th\u1ebf DC \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong t\u1ee7 \u0111i\u1ec7n<\/li>\n<li><strong>IEEE C37.16<\/strong> cho c\u00e1c \u0111\u1ecbnh m\u1ee9c \u01b0u ti\u00ean v\u00e0 khuy\u1ebfn ngh\u1ecb \u1ee9ng d\u1ee5ng cho c\u1ea7u dao \u0111i\u1ec7n h\u1ea1 th\u1ebf<\/li>\n<li><strong>IEEE C37.17<\/strong> cho h\u1ec7 th\u1ed1ng b\u1ea3o v\u1ec7 (trip systems) cho c\u1ea7u dao \u0111i\u1ec7n h\u1ea1 th\u1ebf<\/li>\n<li><strong>IEEE C37.20.1<\/strong> cho t\u1ee7 \u0111i\u1ec7n \u0111\u00f3ng c\u1eaft c\u1ea7u dao \u0111i\u1ec7n h\u1ea1 th\u1ebf k\u00edn kim lo\u1ea1i<\/li>\n<li><strong>ANSI\/NEMA C37.50<\/strong> cho quy tr\u00ecnh th\u1eed nghi\u1ec7m c\u1ea7u dao \u0111i\u1ec7n h\u1ea1 th\u1ebf AC<\/li>\n<li><strong>ANSI\/NEMA C37.51<\/strong> cho quy tr\u00ecnh th\u1eed nghi\u1ec7m s\u1ef1 ph\u00f9 h\u1ee3p cho c\u1ee5m t\u1ee7 \u0111i\u1ec7n \u0111\u00f3ng c\u1eaft c\u1ea7u dao \u0111i\u1ec7n h\u1ea1 th\u1ebf k\u00edn kim lo\u1ea1i<\/li>\n<\/ul>\n<p>\u0110\u00e2y l\u00e0 l\u00fd do t\u1ea1i sao c\u00f4ng vi\u1ec7c li\u00ean quan \u0111\u1ebfn c\u1ea7u dao \u0111i\u1ec7n h\u1ea1 th\u1ebf nghi\u00eam t\u00fac tr\u00ean th\u1ecb tr\u01b0\u1eddng Hoa K\u1ef3 th\u01b0\u1eddng v\u01b0\u1ee3t ra ngo\u00e0i UL 1066 v\u00e0 \u0111i v\u00e0o ph\u1ea1m vi r\u1ed9ng h\u01a1n <strong>h\u1ecd C37<\/strong>.<\/p>\n<h2>T\u1ea1i sao m\u1ed9t s\u1ed1 ti\u00eau chu\u1ea9n C37 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 IEEE v\u00e0 m\u1ed9t s\u1ed1 kh\u00e1c l\u00e0 ANSI\/NEMA<\/h2>\n<p>\u0110i\u1ec1u n\u00e0y g\u00e2y nh\u1ea7m l\u1eabn cho nhi\u1ec1u ng\u01b0\u1eddi \u0111\u1ecdc khi m\u1edbi b\u1eaft \u0111\u1ea7u.<\/p>\n<p>C\u00e2u tr\u1ea3 l\u1eddi ng\u1eafn g\u1ecdn l\u00e0 <strong>C37 l\u00e0 m\u1ed9t h\u1ecd ti\u00eau chu\u1ea9n<\/strong>, nh\u01b0ng \u0111\u01b0\u1eddng d\u1eabn xu\u1ea5t b\u1ea3n kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng \u0111\u01b0\u1ee3c g\u1eafn nh\u00e3n gi\u1ed1ng nhau tr\u00ean m\u1ecdi t\u00e0i li\u1ec7u.<\/p>\n<p>Trong th\u1ef1c t\u1ebf:<\/p>\n<ul>\n<li>c\u00e1c t\u00e0i li\u1ec7u nh\u01b0 <strong>C37.13<\/strong>, <strong>C37.14<\/strong>, <strong>C37.17<\/strong>, V\u00e0 <strong>C37.20.1<\/strong> th\u01b0\u1eddng g\u1eb7p d\u01b0\u1edbi d\u1ea1ng <strong>IEEE<\/strong> \u0111\u01b0\u1eddng d\u1eabn<\/li>\n<li>c\u00e1c t\u00e0i li\u1ec7u nh\u01b0 <strong>C37.50<\/strong> v\u00e0 <strong>C37.51<\/strong> th\u01b0\u1eddng g\u1eb7p d\u01b0\u1edbi d\u1ea1ng <strong>ANSI\/NEMA<\/strong> c\u00e1c t\u00e0i li\u1ec7u<\/li>\n<\/ul>\n<p>\u0110i\u1ec1u quan tr\u1ecdng kh\u00f4ng ph\u1ea3i l\u00e0 ch\u00fang thu\u1ed9c v\u1ec1 c\u00e1c l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt kh\u00e1c nhau. \u0110i\u1ec1u quan tr\u1ecdng l\u00e0 <strong>ch\u00fang l\u00e0 c\u00e1c t\u00e0i li\u1ec7u li\u00ean quan trong khu\u00f4n kh\u1ed5 t\u1ee7 \u0111i\u1ec7n C37 r\u1ed9ng l\u1edbn h\u01a1n, nh\u01b0ng \u0111\u01b0\u1eddng d\u1eabn xu\u1ea5t b\u1ea3n v\u00e0 ph\u00ea duy\u1ec7t \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb tr\u00ean trang b\u00eca c\u00f3 th\u1ec3 kh\u00e1c nhau<\/strong>.<\/p>\n<h2>NEC L\u00e0m G\u00ec v\u00e0 Kh\u00f4ng L\u00e0m G\u00ec<\/h2>\n<p>Nh\u1eefng <strong>B\u1ed9 lu\u1eadt \u0110i\u1ec7n Qu\u1ed1c gia (NEC)<\/strong> l\u00e0 quy t\u1eafc l\u1eafp \u0111\u1eb7t. N\u00f3 cho c\u00e1c nh\u00e0 thi\u1ebft k\u1ebf, ng\u01b0\u1eddi l\u1eafp \u0111\u1eb7t v\u00e0 thanh tra bi\u1ebft thi\u1ebft b\u1ecb \u0111i\u1ec7n ph\u1ea3i \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng nh\u01b0 th\u1ebf n\u00e0o trong c\u00e1c h\u1ec7 th\u1ed1ng th\u1ef1c t\u1ebf.<\/p>\n<p>NEC l\u00e0m g\u00ec:<\/p>\n<ul>\n<li>\u0111\u1eb7t ra c\u00e1c quy t\u1eafc \u1ee9ng d\u1ee5ng<\/li>\n<li>thi\u1ebft l\u1eadp c\u00e1c y\u00eau c\u1ea7u l\u1eafp \u0111\u1eb7t<\/li>\n<li>cho b\u1ea1n bi\u1ebft khi n\u00e0o thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea v\u00e0 d\u00e1n nh\u00e3n ph\u1ea3i \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng theo h\u01b0\u1edbng d\u1eabn c\u1ee7a n\u00f3<\/li>\n<li>x\u00e1c \u0111\u1ecbnh c\u00e1c quy t\u1eafc b\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng trong th\u1ef1c t\u1ebf<\/li>\n<\/ul>\n<p>NEC kh\u00f4ng l\u00e0m g\u00ec:<\/p>\n<ul>\n<li>ch\u1ee9ng nh\u1eadn s\u1ea3n ph\u1ea9m c\u1ea7u dao<\/li>\n<li>\u0111\u00f3ng vai tr\u00f2 l\u00e0 ti\u00eau chu\u1ea9n th\u1eed nghi\u1ec7m s\u1ea3n ph\u1ea9m<\/li>\n<li>thay th\u1ebf c\u00e1c y\u00eau c\u1ea7u li\u1ec7t k\u00ea s\u1ea3n ph\u1ea9m UL<\/li>\n<\/ul>\n<p>\u0110\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao c\u00e1c c\u00e2u h\u1ecfi v\u1ec1 NEC th\u01b0\u1eddng n\u1eb1m tr\u00ean c\u00e2u h\u1ecfi v\u1ec1 UL thay v\u00ec thay th\u1ebf n\u00f3.<\/p>\n<p>Trong c\u00f4ng vi\u1ec7c thi\u1ebft k\u1ebf th\u1ef1c t\u1ebf \u1edf Hoa K\u1ef3, logic th\u01b0\u1eddng tr\u1edf th\u00e0nh:<\/p>\n<ol>\n<li>\u0110\u00e2y l\u00e0 d\u00f2ng c\u1ea7u dao n\u00e0o?<\/li>\n<li>Ti\u00eau chu\u1ea9n s\u1ea3n ph\u1ea9m ho\u1eb7c \u0111\u01b0\u1eddng d\u1eabn li\u1ec7t k\u00ea n\u00e0o \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng?<\/li>\n<li>NEC y\u00eau c\u1ea7u l\u1eafp \u0111\u1eb7t v\u00e0 \u00e1p d\u1ee5ng n\u00f3 nh\u01b0 th\u1ebf n\u00e0o?<\/li>\n<\/ol>\n<h2>T\u1ea1i Sao SCCR v\u00e0 AIC Quan Tr\u1ecdng Trong C\u00f4ng Vi\u1ec7c Li\u00ean Quan \u0110\u1ebfn C\u1ea7u Dao \u1ede Hoa K\u1ef3<\/h2>\n<p>N\u1ebfu b\u1ea1n ch\u1ec9 d\u1eebng l\u1ea1i \u1edf t\u00ean c\u1ee7a c\u00e1c ti\u00eau chu\u1ea9n, b\u1ea1n v\u1eabn b\u1ecf l\u1ee1 m\u1ed9t trong nh\u1eefng c\u00e2u h\u1ecfi k\u1ef9 thu\u1eadt th\u1ef1c t\u1ebf nh\u1ea5t trong vi\u1ec7c l\u1ef1a ch\u1ecdn c\u1ea7u dao \u1edf Hoa K\u1ef3: <strong>thi\u1ebft b\u1ecb ho\u1eb7c c\u1ee5m thi\u1ebft b\u1ecb c\u00f3 th\u1ec3 ng\u1eaft ho\u1eb7c ch\u1ecbu \u0111\u01b0\u1ee3c d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 n\u00e0o m\u1ed9t c\u00e1ch an to\u00e0n trong \u1ee9ng d\u1ee5ng d\u1ef1 ki\u1ebfn c\u1ee7a n\u00f3?<\/strong><\/p>\n<p>Hai kh\u00e1i ni\u1ec7m quan tr\u1ecdng \u1edf \u0111\u00e2y:<\/p>\n<ul>\n<li><strong>AIC<\/strong> th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong th\u1ef1c t\u1ebf v\u1ec1 c\u1ea7u dao \u0111\u1ec3 m\u00f4 t\u1ea3 kh\u1ea3 n\u0103ng c\u1eaft \u1edf \u0111i\u1ec7n \u00e1p v\u00e0 \u0111i\u1ec1u ki\u1ec7n \u0111\u00e3 n\u00eau<\/li>\n<li><strong>SCCR<\/strong> l\u00e0 \u0111\u1ecbnh m\u1ee9c d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch c\u1ee7a c\u1ee5m thi\u1ebft b\u1ecb ho\u1eb7c thi\u1ebft b\u1ecb khi \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong th\u1ef1c t\u1ebf<\/li>\n<\/ul>\n<p>\u0110\u00e2y l\u00e0 n\u01a1i c\u00e1c ti\u00eau chu\u1ea9n ng\u1eebng tr\u1eebu t\u01b0\u1ee3ng v\u00e0 b\u1eaft \u0111\u1ea7u \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn r\u1ee7i ro \u0111\u1eb7c t\u1ea3.<\/p>\n<h3>Trong c\u00f4ng vi\u1ec7c li\u00ean quan \u0111\u1ebfn c\u1ea7u dao v\u1ecf \u0111\u00fac UL 489<\/h3>\n<p>\u0110\u1ecbnh m\u1ee9c c\u1eaft l\u00e0 trung t\u00e2m c\u1ee7a vi\u1ec7c l\u1ef1a ch\u1ecdn s\u1ea3n ph\u1ea9m. M\u1ed9t c\u1ea7u dao c\u00f3 th\u1ec3 ho\u00e0n to\u00e0n ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c trong m\u1ed9t t\u1ee7 \u0111i\u1ec7n v\u00e0 ho\u00e0n to\u00e0n kh\u00f4ng ph\u00f9 h\u1ee3p trong m\u1ed9t t\u1ee7 \u0111i\u1ec7n kh\u00e1c n\u1ebfu d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 c\u00f3 s\u1eb5n cao h\u01a1n kh\u1ea3 n\u0103ng c\u1eaft c\u1ee7a c\u1ea7u dao.<\/p>\n<h3>Trong c\u00f4ng vi\u1ec7c li\u00ean quan \u0111\u1ebfn c\u1ea7u dao \u0111i\u1ec7n \/ UL 1066 v\u00e0 t\u1ee7 \u0111i\u1ec7n \u0111\u00f3ng c\u1eaft<\/h3>\n<p>Cu\u1ed9c th\u1ea3o lu\u1eadn tr\u1edf n\u00ean r\u1ed9ng h\u01a1n v\u00ec vi\u1ec7c l\u1ef1a ch\u1ecdn c\u1ea7u dao kh\u00f4ng ch\u1ec9 g\u1eafn li\u1ec1n v\u1edbi b\u1ea3n th\u00e2n c\u1ea7u dao m\u00e0 c\u00f2n v\u1edbi c\u1ea5u tr\u00fac t\u1ee7 \u0111i\u1ec7n \u0111\u00f3ng c\u1eaft, quy tr\u00ecnh th\u1eed nghi\u1ec7m, h\u1ec7 th\u1ed1ng b\u1ea3o v\u1ec7 v\u00e0 b\u1ed1i c\u1ea3nh h\u1ecd ti\u00eau chu\u1ea9n C37 li\u00ean quan.<\/p>\n<h3>Trong thi\u1ebft b\u1ecb t\u00f9y ch\u1ec9nh v\u00e0 t\u1ee7 \u0111i\u1ec1u khi\u1ec3n c\u00f4ng nghi\u1ec7p<\/h3>\n<p>Ngay c\u1ea3 khi m\u1ed7i th\u00e0nh ph\u1ea7n \u0111\u1ec1u c\u00f3 th\u1ec3 ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c ri\u00eang l\u1ebb, c\u1ee5m thi\u1ebft b\u1ecb v\u1eabn ph\u1ea3i \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1ed9t <strong>SCCR<\/strong>. th\u00edch h\u1ee3p. \u0110\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao c\u00e1c k\u1ef9 s\u01b0 Hoa K\u1ef3 kh\u00f4ng th\u1ec3 d\u1eebng l\u1ea1i \u1edf vi\u1ec7c \u201cc\u1ea7u dao n\u00e0y \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea theo UL\u201d. H\u1ecd c\u0169ng ph\u1ea3i h\u1ecfi:<\/p>\n<ul>\n<li>D\u00f2ng s\u1ef1 c\u1ed1 kh\u1ea3 d\u1ee5ng l\u00e0 bao nhi\u00eau?<\/li>\n<li>Kh\u1ea3 n\u0103ng c\u1eaft \u0111\u1ecbnh m\u1ee9c n\u00e0o \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng?<\/li>\n<li>SCCR n\u00e0o m\u00e0 t\u1ed5 h\u1ee3p ph\u1ea3i mang tr\u00ean nh\u00e3n?<\/li>\n<li>C\u00e1c thi\u1ebft b\u1ecb th\u01b0\u1ee3ng ngu\u1ed3n v\u00e0 h\u1ea1 ngu\u1ed3n t\u01b0\u01a1ng t\u00e1c nh\u01b0 th\u1ebf n\u00e0o trong \u0111i\u1ec1u ki\u1ec7n s\u1ef1 c\u1ed1?<\/li>\n<\/ul>\n<p>\u0110\u00f3 c\u0169ng l\u00e0 l\u00fd do t\u1ea1i sao c\u00e1c cu\u1ed9c th\u1ea3o lu\u1eadn v\u1ec1 ti\u00eau chu\u1ea9n c\u1ea7u dao c\u1ee7a Hoa K\u1ef3 k\u1ebft n\u1ed1i m\u1ed9t c\u00e1ch t\u1ef1 nhi\u00ean v\u1edbi c\u00e1c trang \u1ee9ng d\u1ee5ng nh\u01b0 <a href=\"https:\/\/test.viox.com\/vi\/circuit-breaker-ratings-icu-ics-icw-icm\/\">\u0110\u1ecbnh m\u1ee9c c\u1ea7u dao: Icu, Ics, Icw v\u00e0 Icm<\/a>, m\u1eb7c d\u00f9 c\u00e1c quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean kh\u00f4ng gi\u1ed1ng nhau gi\u1eefa th\u00f4ng l\u1ec7 IEC v\u00e0 UL.<\/p>\n<h2>N\u01a1i NEC Quan Tr\u1ecdng Nh\u1ea5t Trong Ch\u1ee7 \u0110\u1ec1 N\u00e0y<\/h2>\n<p>Khi c\u00e1c k\u1ef9 s\u01b0 so s\u00e1nh UL 489, UL 1066, NEMA AB v\u00e0 NEC, th\u00ec NEC th\u01b0\u1eddng quan tr\u1ecdng nh\u1ea5t trong c\u00e1c l\u0129nh v\u1ef1c sau:<\/p>\n<ul>\n<li>c\u00e1c quy t\u1eafc b\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng<\/li>\n<li>gi\u1edbi h\u1ea1n \u1ee9ng d\u1ee5ng thi\u1ebft b\u1ecb<\/li>\n<li>ph\u01b0\u01a1ng ph\u00e1p l\u1eafp \u0111\u1eb7t<\/li>\n<li>tu\u00e2n th\u1ee7 danh s\u00e1ch v\u00e0 nh\u00e3n m\u00e1c<\/li>\n<li>ph\u1ed1i h\u1ee3p v\u1edbi b\u1ea3ng \u0111i\u1ec7n, thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft ho\u1eb7c h\u1ec7 th\u1ed1ng \u0111\u1ed9ng c\u01a1<\/li>\n<\/ul>\n<p>V\u00ed d\u1ee5: c\u00e1c quy t\u1eafc \u1ee9ng d\u1ee5ng NEC gi\u00fap gi\u1ea3i th\u00edch l\u00fd do t\u1ea1i sao m\u1ed9t c\u1ea7u dao h\u1ee3p l\u1ec7 trong m\u1ed9t b\u1ed1i c\u1ea3nh thi\u1ebft b\u1ecb n\u00e0y kh\u00f4ng th\u1ec3 t\u1ef1 \u0111\u1ed9ng \u0111\u01b0\u1ee3c cho l\u00e0 h\u1ee3p l\u1ec7 trong m\u1ed9t b\u1ed1i c\u1ea3nh kh\u00e1c.<\/p>\n<p>N\u1ebfu b\u1ea1n t\u1eadp trung v\u00e0o \u0111\u1ecbnh m\u1ee9c \u1ee9ng d\u1ee5ng v\u00e0 ng\u00f4n ng\u1eef ph\u1ed1i h\u1ee3p c\u1ee7a c\u1ea7u dao, <a href=\"https:\/\/test.viox.com\/vi\/circuit-breaker-ratings-icu-ics-icw-icm\/\">\u0110\u1ecbnh m\u1ee9c c\u1ea7u dao: Icu, Ics, Icw v\u00e0 Icm<\/a> l\u00e0 m\u1ed9t t\u00e0i li\u1ec7u h\u1eefu \u00edch \u0111\u1ec3 \u0111\u1ecdc k\u00e8m.<\/p>\n<h2>M\u1ed9t C\u00e1ch Th\u1ef1c T\u1ebf \u0110\u1ec3 S\u1eed D\u1ee5ng C\u00e1c Ti\u00eau Chu\u1ea9n N\u00e0y Trong C\u00f4ng Vi\u1ec7c \u0110\u1eb7c T\u1ea3<\/h2>\n<p>Khi vi\u1ebft ho\u1eb7c xem x\u00e9t th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a c\u1ea7u dao tr\u00ean th\u1ecb tr\u01b0\u1eddng Hoa K\u1ef3, quy tr\u00ecnh l\u00e0m vi\u1ec7c k\u1ef9 thu\u1eadt th\u1ef1c t\u1ebf l\u00e0:<\/p>\n<h3>B\u01b0\u1edbc 1. X\u00e1c \u0111\u1ecbnh h\u1ecd c\u1ea7u dao<\/h3>\n<p>B\u1ea1n c\u00f3 \u0111ang ch\u1ec9 \u0111\u1ecbnh:<\/p>\n<ul>\n<li>m\u1ed9t c\u1ea7u dao v\u1ecf \u0111\u00fac \u0111\u1ec3 s\u1eed d\u1ee5ng cho b\u1ea3ng \u0111i\u1ec7n ho\u1eb7c \u0111\u01b0\u1eddng d\u00e2y c\u1ea5p ngu\u1ed3n<\/li>\n<li>ho\u1eb7c m\u1ed9t c\u1ea7u dao c\u00f4ng su\u1ea5t h\u1ea1 th\u1ebf cho thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft<\/li>\n<\/ul>\n<p>Quy\u1ebft \u0111\u1ecbnh \u0111\u00f3 th\u01b0\u1eddng ch\u1ec9 ra ngay l\u1eadp t\u1ee9c UL 489 ho\u1eb7c UL 1066.<\/p>\n<h3>B\u01b0\u1edbc 2. Ki\u1ec3m tra b\u1ed1i c\u1ea3nh t\u1ed5 h\u1ee3p<\/h3>\n<p>C\u1ea7u dao s\u1ebd \u0111\u01b0\u1ee3c l\u1eafp v\u00e0o:<\/p>\n<ul>\n<li>b\u1ea3ng \u0111i\u1ec7n<\/li>\n<li>t\u1ee7 \u0111i\u1ec7n<\/li>\n<li>\u0111\u00f3ng c\u1eaft<\/li>\n<li>thi\u1ebft b\u1ecb c\u00f4ng nghi\u1ec7p t\u00f9y ch\u1ec9nh<\/li>\n<\/ul>\n<p>B\u1ed1i c\u1ea3nh thi\u1ebft b\u1ecb quan tr\u1ecdng kh\u00f4ng k\u00e9m b\u1ea3n th\u00e2n c\u1ea7u dao.<\/p>\n<h3>B\u01b0\u1edbc 3. Ki\u1ec3m tra c\u00e1c y\u00eau c\u1ea7u \u1ee9ng d\u1ee5ng NEC<\/h3>\n<p>Ngay c\u1ea3 m\u1ed9t c\u1ea7u dao \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea ch\u00ednh x\u00e1c v\u1eabn c\u00f3 th\u1ec3 b\u1ecb \u00e1p d\u1ee5ng sai n\u1ebfu thi\u1ebft k\u1ebf l\u1eafp \u0111\u1eb7t kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c y\u00eau c\u1ea7u c\u1ee7a NEC.<\/p>\n<h3>B\u01b0\u1edbc 4. S\u1eed d\u1ee5ng c\u00e1c t\u00e0i li\u1ec7u NEMA AB \u0111\u1ec3 h\u1ed7 tr\u1ee3, kh\u00f4ng thay th\u1ebf cho quy t\u1eafc<\/h3>\n<p>C\u00e1c t\u00e0i li\u1ec7u NEMA AB c\u00f3 gi\u00e1 tr\u1ecb \u0111\u1ec3 hi\u1ec3u, b\u1ea3o tr\u00ec v\u00e0 chi ti\u1ebft \u1ee9ng d\u1ee5ng c\u1ee7a c\u1ea7u dao v\u1ecf \u0111\u00fac, nh\u01b0ng ch\u00fang kh\u00f4ng thay th\u1ebf c\u00e1c ngh\u0129a v\u1ee5 l\u1eafp \u0111\u1eb7t c\u1ee7a NEC.<\/p>\n<h3>B\u01b0\u1edbc 5. X\u00e1c nh\u1eadn d\u00f2ng s\u1ef1 c\u1ed1 v\u00e0 c\u00e1c k\u1ef3 v\u1ecdng v\u1ec1 \u0111\u1ecbnh m\u1ee9c<\/h3>\n<p>T\u1ea1i th\u1ecb tr\u01b0\u1eddng Hoa K\u1ef3, \u0111i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 ki\u1ec3m tra xem c\u1ea7u dao v\u00e0 t\u1ed5 h\u1ee3p c\u00f3 th\u1ec3 h\u1ed7 tr\u1ee3 \u0111i\u1ec1u ki\u1ec7n d\u00f2ng s\u1ef1 c\u1ed1 kh\u1ea3 d\u1ee5ng, y\u00eau c\u1ea7u c\u1eaft v\u00e0 k\u1ef3 v\u1ecdng SCCR t\u1ea1i \u0111i\u1ec3m l\u1eafp \u0111\u1eb7t hay kh\u00f4ng.<\/p>\n<h3>B\u01b0\u1edbc 6. H\u1ecfi xem d\u1ef1 \u00e1n ch\u1ec9 d\u00e0nh cho Hoa K\u1ef3 hay c\u00f2n h\u01b0\u1edbng \u0111\u1ebfn IEC<\/h3>\n<p>N\u1ebfu d\u1ef1 \u00e1n c\u0169ng ph\u1ee5c v\u1ee5 th\u1ecb tr\u01b0\u1eddng qu\u1ed1c t\u1ebf, c\u00e1c k\u1ef9 s\u01b0 th\u01b0\u1eddng c\u1ea7n hi\u1ec3u v\u1ecb tr\u00ed c\u1ee7a <strong>IEC 60947-1<\/strong> v\u00e0 <strong>TRUY\u1ec0N th\u00f4ng 60947-2<\/strong> so v\u1edbi khu\u00f4n kh\u1ed5 c\u1ee7a Hoa K\u1ef3. Ch\u00fang kh\u00f4ng ph\u1ea3i l\u00e0 b\u1ea3n sao tr\u1ef1c ti\u1ebfp c\u1ee7a UL 489 ho\u1eb7c UL 1066, nh\u01b0ng ch\u00fang l\u00e0 c\u00e1c \u0111i\u1ec3m tham chi\u1ebfu ch\u00ednh b\u00ean ph\u00eda IEC cho thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft v\u00e0 c\u1ea7u dao h\u1ea1 th\u1ebf.<\/p>\n<h2>Nh\u1eefng Sai L\u1ea7m Ph\u1ed5 Bi\u1ebfn M\u00e0 K\u1ef9 S\u01b0 V\u00e0 Ng\u01b0\u1eddi Mua M\u1eafc Ph\u1ea3i<\/h2>\n<h3>Coi UL 489 v\u00e0 UL 1066 nh\u01b0 th\u1ec3 ch\u00fang m\u00f4 t\u1ea3 c\u00f9ng m\u1ed9t lo\u1ea1i thi\u1ebft b\u1ecb<\/h3>\n<p>Ch\u00fang kh\u00f4ng m\u00f4 t\u1ea3 c\u00f9ng m\u1ed9t lo\u1ea1i thi\u1ebft b\u1ecb. Ch\u00fang bao g\u1ed3m c\u00e1c h\u1ecd c\u1ea7u dao h\u1ea1 th\u1ebf kh\u00e1c nhau.<\/p>\n<h3>Coi NEMA AB nh\u01b0 m\u1ed9t c\u00e2u tr\u1ea3 l\u1eddi \u0111\u1ed9c l\u1eadp duy nh\u1ea5t<\/h3>\n<p>Th\u00f4ng th\u01b0\u1eddng c\u00e2u h\u1ecfi th\u1ef1c s\u1ef1 l\u00e0 b\u1ea1n mu\u1ed1n n\u00f3i \u0111\u1ebfn t\u00e0i li\u1ec7u AB n\u00e0o v\u00e0 b\u1ea1n \u0111ang n\u00f3i v\u1ec1 t\u00ednh t\u01b0\u01a1ng \u0111\u01b0\u01a1ng c\u1ee7a s\u1ea3n ph\u1ea9m, h\u01b0\u1edbng d\u1eabn b\u1ea3o tr\u00ec hay m\u1ed9t v\u1ea5n \u0111\u1ec1 \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3.<\/p>\n<h3>Gi\u1ea3 \u0111\u1ecbnh NEC l\u00e0 ch\u1ee9ng nh\u1eadn s\u1ea3n ph\u1ea9m<\/h3>\n<p>N\u00f3 kh\u00f4ng ph\u1ea3i l\u00e0 ch\u1ee9ng nh\u1eadn s\u1ea3n ph\u1ea9m. NEC l\u00e0 quy t\u1eafc l\u1eafp \u0111\u1eb7t, kh\u00f4ng ph\u1ea3i danh s\u00e1ch an to\u00e0n s\u1ea3n ph\u1ea9m.<\/p>\n<h3>B\u1ecf qua d\u00f2ng s\u1ef1 c\u1ed1 kh\u1ea3 d\u1ee5ng, \u0111\u1ecbnh m\u1ee9c c\u1eaft ho\u1eb7c SCCR<\/h3>\n<p>\u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng c\u00e1ch nhanh nh\u1ea5t \u0111\u1ec3 bi\u1ebfn m\u1ed9t th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt \u201ctu\u00e2n th\u1ee7\u201d th\u00e0nh m\u1ed9t v\u1ea5n \u0111\u1ec1 th\u1ef1c t\u1ebf.<\/p>\n<blockquote><p><strong>L\u01b0u \u00dd Th\u1ef1c T\u1ebf T\u1eeb Chuy\u00ean Gia:<\/strong> Trong c\u00e1c \u0111\u00e1nh gi\u00e1 n\u00e2ng c\u1ea5p c\u1ea7u dao, m\u1ed9t trong nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn nh\u1ea5t trong th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt l\u00e0 ch\u1ec9 kh\u1edbp \u0111\u1ecbnh m\u1ee9c ampe v\u00e0 k\u00edch th\u01b0\u1edbc khung trong khi b\u1ecf qua b\u1ed1i c\u1ea3nh d\u00f2ng s\u1ef1 c\u1ed1 c\u1ee7a t\u1ed5 h\u1ee3p. Tr\u00ean gi\u1ea5y t\u1edd, s\u1ef1 thay th\u1ebf c\u00f3 v\u1ebb t\u01b0\u01a1ng \u0111\u01b0\u01a1ng. Trong th\u1ef1c t\u1ebf, v\u1ea5n \u0111\u1ec1 xu\u1ea5t hi\u1ec7n khi SCCR c\u1ee7a t\u1ee7 \u0111i\u1ec7n ho\u1eb7c b\u1ea3ng \u0111i\u1ec7n kh\u00f4ng c\u00f2n ph\u00f9 h\u1ee3p ho\u00e0n to\u00e0n v\u1edbi d\u00f2ng s\u1ef1 c\u1ed1 kh\u1ea3 d\u1ee5ng ho\u1eb7c v\u1edbi h\u1ecd c\u1ea7u dao d\u1ef1 ki\u1ebfn.<\/p><\/blockquote>\n<h3>L\u1ef1a ch\u1ecdn ch\u1ec9 theo \u0111\u1ecbnh m\u1ee9c d\u00f2ng \u0111i\u1ec7n<\/h3>\n<p>Trong th\u1ef1c t\u1ebf \u1edf Hoa K\u1ef3, h\u1ecd c\u1ea7u dao, b\u1ed1i c\u1ea3nh t\u1ed5 h\u1ee3p, \u0111\u01b0\u1eddng d\u1eabn danh s\u00e1ch v\u00e0 \u1ee9ng d\u1ee5ng quy t\u1eafc \u0111\u1ec1u l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a quy\u1ebft \u0111\u1ecbnh, kh\u00f4ng ch\u1ec9 ampe.<\/p>\n<h3>Gi\u1ea3 \u0111\u1ecbnh m\u1ecdi c\u00e2u h\u1ecfi v\u1ec1 \u201cc\u1ea7u dao UL\u201d \u0111\u1ec1u d\u1eebng l\u1ea1i \u1edf UL<\/h3>\n<p>Trong nhi\u1ec1u d\u1ef1 \u00e1n th\u1ef1c t\u1ebf, c\u00e2u tr\u1ea3 l\u1eddi \u0111\u1ea7y \u0111\u1ee7 c\u0169ng bao g\u1ed3m c\u00e1c quy t\u1eafc \u1ee9ng d\u1ee5ng NEC, h\u01b0\u1edbng d\u1eabn NEMA, b\u1ed1i c\u1ea3nh IEEE C37 v\u00e0 \u0111\u00f4i khi l\u00e0 khu\u00f4n kh\u1ed5 c\u00f4ng nh\u1eadn OSHA NRTL \u0111\u1eb1ng sau vi\u1ec7c ch\u1ea5p nh\u1eadn ch\u1ee9ng nh\u1eadn.<\/p>\n<h2>Nh\u1eefng C\u00e2u H\u1ecfi Th\u01b0\u1eddng<\/h2>\n<h3>UL 489 c\u00f3 gi\u1ed1ng v\u1edbi UL 1066 kh\u00f4ng?<\/h3>\n<p>Ti\u00eau chu\u1ea9n UL 489 \u00e1p d\u1ee5ng cho d\u00f2ng s\u1ea3n ph\u1ea9m aptomat v\u1ecf \u0111\u00fac (molded-case breaker), trong khi ti\u00eau chu\u1ea9n UL 1066 \u00e1p d\u1ee5ng cho aptomat c\u00f4ng su\u1ea5t h\u1ea1 th\u1ebf (low-voltage power circuit breaker) \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong t\u1ee7 \u0111i\u1ec7n.<\/p>\n<h3>NEMA AB 1 c\u00f3 kh\u00e1c bi\u1ec7t g\u00ec so v\u1edbi UL 489 kh\u00f4ng?<\/h3>\n<p>Trong l\u1ecbch s\u1eed, ch\u00fang \u0111\u00e3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft ch\u1eb7t ch\u1ebd trong b\u1ed1i c\u1ea3nh c\u1ea7u dao v\u1ecf \u0111\u00fac. Tuy nhi\u00ean, trong th\u1ef1c t\u1ebf hi\u1ec7n t\u1ea1i \u1edf B\u1eafc M\u1ef9, c\u00e1c k\u1ef9 s\u01b0 th\u01b0\u1eddng hi\u1ec3u khu\u00f4n kh\u1ed5 s\u1ea3n ph\u1ea9m c\u1ea7u dao v\u1ecf \u0111\u00fac th\u00f4ng qua s\u1ef1 li\u00ean k\u1ebft ba qu\u1ed1c gia c\u1ee7a <strong>UL 489 \/ CSA C22.2 S\u1ed1 5 \/ NMX-J-266-ANCE<\/strong>, trong khi AB 1 h\u1eefu \u00edch h\u01a1n nh\u01b0 m\u1ed9t ph\u1ea7n c\u1ee7a l\u1ecbch s\u1eed ti\u00eau chu\u1ea9n v\u00e0 d\u00f2ng d\u00f5i h\u1ecd t\u00e0i li\u1ec7u.<\/p>\n<h3>NEC c\u00f3 thay th\u1ebf c\u00e1c ti\u00eau chu\u1ea9n UL cho c\u1ea7u dao kh\u00f4ng?<\/h3>\n<p>Kh\u00f4ng. Ti\u00eau chu\u1ea9n NEC quy \u0111\u1ecbnh v\u1ec1 l\u1eafp \u0111\u1eb7t v\u00e0 \u1ee9ng d\u1ee5ng. Ti\u00eau chu\u1ea9n UL quy \u0111\u1ecbnh v\u1ec1 an to\u00e0n s\u1ea3n ph\u1ea9m v\u00e0 c\u00e1c h\u1ea1ng m\u1ee5c ch\u1ee9ng nh\u1eadn.<\/p>\n<h3>Ti\u00eau chu\u1ea9n n\u00e0o ph\u00f9 h\u1ee3p h\u01a1n cho MCCB?<\/h3>\n<p>Trong th\u1ef1c t\u1ebf \u0111i\u1ec7n h\u1ea1 th\u1ebf \u1edf Hoa K\u1ef3, aptomat v\u1ecf \u0111\u00fac (MCCB) ch\u1ee7 y\u1ebfu li\u00ean quan \u0111\u1ebfn ti\u00eau chu\u1ea9n UL 489 \/ NEMA AB 1.<\/p>\n<h3>Ti\u00eau chu\u1ea9n n\u00e0o ph\u00f9 h\u1ee3p h\u01a1n cho c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n h\u1ea1 th\u1ebf trong t\u1ee7 \u0111i\u1ec7n?<\/h3>\n<p>\u0110\u00f3 l\u00e0 l\u00fd do ti\u00eau chu\u1ea9n s\u1ea3n ph\u1ea9m UL 1066 tr\u1edf n\u00ean ph\u00f9 h\u1ee3p h\u01a1n.<\/p>\n<h3>M\u1ed1i quan h\u1ec7 gi\u1eefa ANSI, IEEE, NEMA, UL v\u00e0 NEC l\u00e0 g\u00ec?<\/h3>\n<p>ANSI l\u00e0 t\u1ed5 ch\u1ee9c \u0111i\u1ec1u ph\u1ed1i v\u00e0 ph\u00ea duy\u1ec7t cho c\u00e1c Ti\u00eau chu\u1ea9n Qu\u1ed1c gia Hoa K\u1ef3. IEEE v\u00e0 NEMA l\u00e0 c\u00e1c t\u1ed5 ch\u1ee9c ph\u00e1t tri\u1ec3n ti\u00eau chu\u1ea9n. UL li\u00ean quan \u0111\u1ebfn c\u00e1c ti\u00eau chu\u1ea9n s\u1ea3n ph\u1ea9m v\u00e0 ho\u1ea1t \u0111\u1ed9ng ch\u1ee9ng nh\u1eadn s\u1ea3n ph\u1ea9m. NFPA xu\u1ea5t b\u1ea3n NEC, v\u00e0 NEC chi ph\u1ed1i vi\u1ec7c l\u1eafp \u0111\u1eb7t v\u00e0 \u1ee9ng d\u1ee5ng h\u01a1n l\u00e0 vi\u1ec7c li\u1ec7t k\u00ea s\u1ea3n ph\u1ea9m.<\/p>\n<h2>Khuy\u1ebfn ngh\u1ecb cu\u1ed1i c\u00f9ng<\/h2>\n<p>N\u1ebfu b\u1ea1n ch\u1ec9 nh\u1edb m\u1ed9t \u0111i\u1ec1u t\u1eeb b\u00e0i vi\u1ebft n\u00e0y, h\u00e3y nh\u1edb \u0111i\u1ec1u n\u00e0y:<\/p>\n<ul>\n<li><strong>UL 489<\/strong> = th\u1ebf gi\u1edbi c\u1ea7u dao v\u1ecf \u0111\u00fac<\/li>\n<li><strong>UL 1066<\/strong> = th\u1ebf gi\u1edbi c\u1ea7u dao c\u00f4ng su\u1ea5t h\u1ea1 th\u1ebf<\/li>\n<li><strong>NEMA AB<\/strong> = h\u1ecd t\u00e0i li\u1ec7u c\u1ea7u dao v\u1ecf \u0111\u00fac<\/li>\n<li><strong>IEEE C37<\/strong> = h\u1ecd ti\u00eau chu\u1ea9n thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft v\u00e0 c\u1ea7u dao c\u00f4ng su\u1ea5t<\/li>\n<li><strong>NEC<\/strong> = quy t\u1eafc l\u1eafp \u0111\u1eb7t v\u00e0 \u1ee9ng d\u1ee5ng<\/li>\n<\/ul>\n<p>Khi nh\u1eefng vai tr\u00f2 \u0111\u00f3 \u0111\u01b0\u1ee3c t\u00e1ch bi\u1ec7t r\u00f5 r\u00e0ng, vi\u1ec7c l\u1ef1a ch\u1ecdn c\u1ea7u dao \u1edf Hoa K\u1ef3 s\u1ebd tr\u1edf n\u00ean d\u1ec5 d\u00e0ng h\u01a1n nhi\u1ec1u \u0111\u1ec3 di\u1ec5n gi\u1ea3i.<\/p>\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c ch\u1ee7 \u0111\u1ec1 li\u1ec1n k\u1ec1, h\u00e3y ti\u1ebfp t\u1ee5c v\u00e0o:<\/p>\n<ul>\n<li><a href=\"https:\/\/test.viox.com\/vi\/mccb\/\">MCCB<\/a><\/li>\n<li><a href=\"https:\/\/test.viox.com\/vi\/acb\/\">Ng\u00e2n h\u00e0ng<\/a><\/li>\n<li><a href=\"https:\/\/test.viox.com\/vi\/full-guide-to-molded-case-circuit-breakers-mccbs\/\">H\u01b0\u1edbng d\u1eabn \u0111\u1ea7y \u0111\u1ee7 v\u1ec1 m\u00e1y c\u1eaft m\u1ea1ch v\u1ecf \u0111\u00fac (MCCB)<\/a><\/li>\n<li><a href=\"https:\/\/test.viox.com\/vi\/complete-guide-to-air-circuit-breakers-acb\/\">H\u01b0\u1edbng d\u1eabn \u0111\u1ea7y \u0111\u1ee7 v\u1ec1 M\u00e1y c\u1eaft kh\u00f4ng kh\u00ed (ACB)<\/a><\/li>\n<\/ul>\n<\/div>\n<div class=\"simg-pop-btn\" style=\"top: 94.875px; left: 14px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 94.875px; left: 14px; display: none;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>An engineer reviewing US low-voltage circuit breaker standards and documentation in a switchgear facility. If you work with low-voltage circuit breakers in the United States, the hardest part is often not the breaker itself. It is figuring out who does what in the standards system. People see names like: ANSI IEEE NEMA UL NFPA UL [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":23339,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-23338","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/23338","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/comments?post=23338"}],"version-history":[{"count":1,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/23338\/revisions"}],"predecessor-version":[{"id":23340,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/23338\/revisions\/23340"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/media\/23339"}],"wp:attachment":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/media?parent=23338"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/categories?post=23338"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/tags?post=23338"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}