{"id":3067,"date":"2026-07-12T08:13:57","date_gmt":"2026-07-12T08:13:57","guid":{"rendered":"https:\/\/huyuglobal.com\/?p=3067"},"modified":"2026-07-12T08:13:59","modified_gmt":"2026-07-12T08:13:59","slug":"is-it-dangerous-if-a-circuit-breaker-keeps-tripping","status":"publish","type":"post","link":"https:\/\/huyuglobal.com\/vi\/blog\/is-it-dangerous-if-a-circuit-breaker-keeps-tripping\/","title":{"rendered":"C\u00f3 nguy hi\u1ec3m kh\u00f4ng n\u1ebfu m\u1ed9t Circuit Breaker li\u00ean t\u1ee5c ng\u1eaft m\u1ea1ch?"},"content":{"rendered":"

M\u1ed9t ch\u1ee7 nh\u00e0 \u1edf Atlanta \u0111\u00e3 quan s\u00e1t th\u1ea5y c\u1ea7u dao 20-amp c\u1ee7a \u1ed5 c\u1eafm b\u1ebfp c\u1ee7a c\u00f4 \u1ea5y \u0111\u00e3 b\u1ecb ng\u1eaft ba l\u1ea7n trong m\u1ed9t th\u00e1ng \u2014 m\u1ed7i l\u1ea7n \u0111\u1ec1u do vi\u1ec7c s\u1eed d\u1ee5ng \u0111\u1ed3ng th\u1eddi l\u00f2 vi s\u00f3ng v\u00e0 m\u00e1y n\u01b0\u1edbng b\u00e1nh. Trong m\u1ed7i tr\u01b0\u1eddng h\u1ee3p, c\u00f4 \u1ea5y ph\u1ea3i \u0111i \u0111\u1ebfn b\u1ea3ng c\u1ea7u dao v\u00e0 \u0111\u1eb7t l\u1ea1i n\u00f3. Tuy nhi\u00ean, l\u1ea7n th\u1ee9 t\u01b0, c\u1ea7u dao kh\u00f4ng ch\u1ec9 b\u1ecb ng\u1eaft m\u00e0 c\u00f2n \u1ea5m khi ch\u1ea1m v\u00e0o v\u1edbi m\u1ed9t m\u00f9i nh\u1eb9 c\u1ee7a nh\u1ef1a ch\u00e1y g\u1ea7n \u0111\u00f3. Ch\u1ee7 nh\u00e0 \u0111\u00e3 g\u1ecdi th\u1ee3 \u0111i\u1ec7n, ng\u01b0\u1eddi \u0111\u00e3 ph\u00e1t hi\u1ec7n ra r\u1eb1ng c\u00e1c ti\u1ebfp \u0111i\u1ec3m b\u00ean trong c\u1ee7a c\u1ea7u dao \u0111\u00e3 b\u1ecb h\u1ed3 quang trong m\u1ed9t th\u1eddi gian d\u00e0i, do \u0111\u00f3 l\u00e0m h\u1ecfng thanh bus c\u00f9ng l\u00fac. C\u1ea7u dao \u0111\u00e3 b\u1ecb h\u1ecfng, t\u1ea1o ra nhi\u1ec7t b\u00ean trong b\u1ea3ng thay v\u00ec ng\u1eaft khi qu\u00e1 t\u1ea3i. T\u00ecnh hu\u1ed1ng n\u00e0y \u0111\u00e3 \u0111\u1eb7t ra c\u00e2u h\u1ecfi li\u1ec7u c\u00f3 nguy hi\u1ec3m khi m\u1ed9t c\u1ea7u dao th\u01b0\u1eddng xuy\u00ean b\u1ecb ng\u1eaft hay kh\u00f4ng. C\u00e2u tr\u1ea3 l\u1eddi l\u00e0 c\u00f3. Vi\u1ec7c ng\u1eaft th\u01b0\u1eddng xuy\u00ean cho th\u1ea5y r\u00f5 r\u00e0ng r\u1eb1ng c\u00f3 \u0111i\u1ec1u g\u00ec \u0111\u00f3 kh\u00f4ng \u1ed5n v\u1edbi m\u1ea1ch \u0111i\u1ec7n.<\/p>\n

T\u1ea1i sao m\u1ed9t c\u1ea7u dao b\u1ecb ng\u1eaft: B\u1ed1n nguy\u00ean nh\u00e2n ch\u00ednh<\/h2>\n

M\u1ed9t c\u1ea7u dao l\u00e0 m\u1ed9t c\u01a1 ch\u1ebf an to\u00e0n ho\u1ea1t \u0111\u1ed9ng m\u00e0 kh\u00f4ng c\u1ea7n s\u1ef1 tr\u1ee3 gi\u00fap th\u1ee7 c\u00f4ng. Khi c\u1ea7u dao b\u1ecb ng\u1eaft, n\u00f3 \u0111ang ho\u1ea1t \u0111\u1ed9ng \u0111\u00fang c\u00e1ch. N\u00f3 m\u1edf m\u1ea1ch \u0111\u1ec3 c\u00e1c d\u00e2y kh\u00f4ng b\u1ecb qu\u00e1 nhi\u1ec7t ho\u1eb7c t\u00ecnh hu\u1ed1ng l\u1ed7i kh\u00f4ng tr\u1edf n\u00ean t\u1ed3i t\u1ec7 h\u01a1n. \u0110\u1ec3 hi\u1ec3u r\u00f5 v\u1ec1 nguy hi\u1ec3m, ng\u01b0\u1eddi ta kh\u00f4ng n\u00ean ch\u1ec9 ngh\u0129 \u0111\u1ebfn vi\u1ec7c ng\u1eaft \u0111\u01a1n thu\u1ea7n \u2014 c\u1ea7n ph\u1ea3i hi\u1ec3u nguy\u00ean nh\u00e2n \u0111\u00e3 g\u00e2y ra vi\u1ec7c ng\u1eaft. \u0110i\u1ec1u quan tr\u1ecdng l\u00e0 ch\u1ec9 ra r\u1eb1ng vi\u1ec7c ng\u1eaft l\u1eb7p \u0111i l\u1eb7p l\u1ea1i l\u00e0 d\u1ea5u hi\u1ec7u c\u1ee7a m\u1ed9t nguy\u00ean nh\u00e2n ti\u1ec1m \u1ea9n c\u00f3 th\u1ec3 nghi\u00eam tr\u1ecdng h\u01a1n ho\u1eb7c \u00edt nghi\u00eam tr\u1ecdng h\u01a1n. C\u00f3 b\u1ed1n nguy\u00ean nh\u00e2n ch\u00ednh d\u1eabn \u0111\u1ebfn vi\u1ec7c c\u1ea7u dao b\u1ecb ng\u1eaft, t\u1eeb qu\u00e1 t\u1ea3i \u0111\u1ebfn l\u1ed7i \u0111\u1ea5t nghi\u00eam tr\u1ecdng.<\/p>\n

\"T\u1ea1i<\/p>\n

Qu\u00e1 t\u1ea3i.<\/strong>\u00a0M\u1ed9t m\u1ea1ch lu\u00f4n mang qu\u00e1 nhi\u1ec1u t\u1ea3i d\u1eabn \u0111\u1ebfn vi\u1ec7c ng\u1eaft kh\u00f4ng mong mu\u1ed1n. Trong khi vi\u1ec7c ng\u1eaft kh\u00f4ng mong mu\u1ed1n t\u1ef1 n\u00f3 kh\u00f4ng nguy hi\u1ec3m v\u00e0 c\u1ea7u dao ch\u1ec9 \u0111\u01a1n gi\u1ea3n l\u00e0 b\u1ea3o v\u1ec7 m\u1ea1ch kh\u1ecfi qu\u00e1 nhi\u1ec7t, t\u1ea3i qu\u00e1 m\u1ee9c li\u00ean t\u1ee5c c\u00f3 th\u1ec3 l\u00e0m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u1ea7u dao. Th\u00e0nh ph\u1ea7n nhi\u1ec7t, ho\u1eb7c d\u1ea3i kim lo\u1ea1i hai l\u1edbp, s\u1ebd b\u1eaft \u0111\u1ea7u l\u1ec7ch kh\u1ecfi v\u1ecb tr\u00ed \u0111\u00e3 hi\u1ec7u ch\u1ec9nh c\u1ee7a n\u00f3. Vi\u1ec7c ng\u1eaft kh\u00f4ng mong mu\u1ed1n x\u1ea3y ra \u1edf m\u1ee9c d\u00f2ng \u0111i\u1ec7n th\u1ea5p h\u01a1n, v\u00e0 vi\u1ec7c gia nhi\u1ec7t v\u00e0 l\u00e0m m\u00e1t l\u1eb7p \u0111i l\u1eb7p l\u1ea1i s\u1ebd ch\u1ec9 l\u00e0m m\u00f2n c\u00e1c ti\u1ebfp \u0111i\u1ec3m. N\u1ebfu b\u1ea1n c\u1ea7n gi\u00fap x\u00e1c \u0111\u1ecbnh t\u1ea3i \u0111\u00fang cho m\u1ed9t m\u1ea1ch c\u1ee5 th\u1ec3, h\u01b0\u1edbng d\u1eabn c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 k\u00edch th\u01b0\u1edbc c\u1ea7u dao b\u1ea1n c\u1ea7n<\/a> gi\u1ea3i th\u00edch c\u00e1ch t\u00ednh to\u00e1n d\u1ef1a tr\u00ean NEC.<\/p>\n

Ng\u1eafn m\u1ea1ch.<\/strong>\u00a0N\u1ebfu m\u1ed9t d\u00e2y d\u1eabn s\u1ed1ng ti\u1ebfp x\u00fac v\u1edbi m\u1ed9t d\u00e2y trung t\u00ednh ho\u1eb7c m\u1ed9t d\u00e2y d\u1eabn s\u1ed1ng kh\u00e1c, d\u00f2ng \u0111i\u1ec7n s\u1ebd t\u0103ng ngay l\u1eadp t\u1ee9c l\u00ean h\u00e0ng ngh\u00ecn ampe. H\u00e0nh \u0111\u1ed9ng ng\u1eaft t\u1eeb t\u00ednh c\u1ee7a c\u1ea7u dao ph\u1ea3i \u0111\u1ee7 nhanh \u0111\u1ec3 d\u1eebng l\u1ed7i trong mili gi\u00e2y. M\u1ed9t ng\u1eafn m\u1ea1ch l\u00e0 m\u1ed9t s\u1ef1 c\u1ed1 nghi\u00eam tr\u1ecdng t\u1ea1o ra nhi\u1ec7t \u0111\u1ed9 kh\u1ed5ng l\u1ed3 t\u1ea1i v\u1ecb tr\u00ed l\u1ed7i v\u00e0 b\u00ean trong c\u1ea7u dao. Trong tr\u01b0\u1eddng h\u1ee3p ng\u1eafn m\u1ea1ch, n\u1ebfu m\u1ed9t ch\u1ee7 nh\u00e0 c\u1ed1 g\u1eafng \u0111\u1eb7t l\u1ea1i c\u00f4ng t\u1eafc ng\u1eaft tr\u01b0\u1edbc khi \u0111i\u1ec1u tra nguy\u00ean nh\u00e2n c\u1ee7a vi\u1ec7c ng\u1eaft, ng\u1eafn m\u1ea1ch c\u00f3 kh\u1ea3 n\u0103ng v\u1eabn t\u1ed3n t\u1ea1i. C\u1ea7u dao s\u1ebd b\u1ecb ng\u1eaft m\u1ed9t l\u1ea7n n\u1eefa ngay l\u1ea7n \u0111\u1ea7u ti\u00ean c\u1ed1 g\u1eafng b\u1eadt l\u1ea1i. D\u00f2ng \u0111i\u1ec7n l\u1ed7i ch\u1ea3y l\u1eb7p \u0111i l\u1eb7p l\u1ea1i \u1edf giai \u0111o\u1ea1n n\u00e0y c\u00f3 th\u1ec3 h\u00e0n c\u00e1c ti\u1ebfp \u0111i\u1ec3m ho\u1eb7c g\u00e2y h\u01b0 h\u1ea1i cho thanh bus, v\u00e0 trong tr\u01b0\u1eddng h\u1ee3p x\u1ea5u nh\u1ea5t, g\u00e2y ra h\u1ecfa ho\u1ea1n.<\/p>\n

L\u1ed7i \u0111\u1ea5t.<\/strong>\u00a0M\u1ed9t d\u00e2y \u0111i\u1ec7n s\u1ed1ng ti\u1ebfp x\u00fac v\u1edbi m\u1ed9t v\u1eadt th\u1ec3 n\u1ed1i \u0111\u1ea5t, ch\u1eb3ng h\u1ea1n nh\u01b0 th\u00e2n kim lo\u1ea1i c\u1ee7a m\u1ed9t thi\u1ebft b\u1ecb, m\u1ed9t h\u1ed9p n\u1ed1i ho\u1eb7c th\u1eadm ch\u00ed l\u00e0 m\u1ed9t ng\u01b0\u1eddi. D\u00f2ng \u0111i\u1ec7n ph\u00e1t sinh \u0111i v\u00e0o \u0111\u1ea5t v\u00e0 t\u1ea1o ra kh\u1ea3 n\u0103ng b\u1ecb \u0111i\u1ec7n gi\u1eadt c\u0169ng nh\u01b0 ch\u00e1y. M\u1ed9t c\u1ea7u dao th\u00f4ng th\u01b0\u1eddng c\u00f3 th\u1ec3 ho\u1eb7c kh\u00f4ng th\u1ec3 ng\u1eaft khi c\u00f3 l\u1ed7i n\u1ed1i \u0111\u1ea5t t\u00f9y thu\u1ed9c v\u00e0o d\u00f2ng l\u1ed7i v\u00ec \u0111\u01b0\u1eddng d\u1eabn \u0111\u1ea5t c\u00f3 th\u1ec3 c\u00f3 \u0111\u1ee7 \u0111i\u1ec7n tr\u1edf \u0111\u1ec3 d\u00f2ng \u0111i\u1ec7n kh\u00f4ng \u0111\u1ea1t ng\u01b0\u1ee1ng ng\u1eaft t\u1eeb t\u00ednh. \u0110\u00e2y l\u00e0 l\u00fd do t\u1ea1i sao NEC y\u00eau c\u1ea7u l\u1eafp \u0111\u1eb7t c\u00e1c thi\u1ebft b\u1ecb GFCI trong ph\u00f2ng t\u1eafm, b\u1ebfp, trong gara ho\u1eb7c ngo\u00e0i tr\u1eddi. GFCI ph\u00e1t hi\u1ec7n d\u00f2ng l\u1ed7i n\u1ed1i \u0111\u1ea5t \u1edf m\u1ee9c 5 mA v\u00e0 ng\u1eaft trong m\u1ed9t kho\u1ea3nh kh\u1eafc nhanh h\u01a1n nhi\u1ec1u so v\u1edbi c\u1ea7u dao ti\u00eau chu\u1ea9n. N\u1ebfu c\u1ea7u dao GFCI\/\u1ed5 c\u1eafm li\u00ean t\u1ee5c ng\u1eaft, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 c\u00f3 m\u1ed9t l\u1ed7i trong m\u1ea1ch d\u01b0\u1edbi d\u1ea1ng d\u00e2y c\u00e1p b\u1ecb l\u1ed7i, k\u1ebft n\u1ed1i \u1ea9m \u01b0\u1edbt ho\u1eb7c thi\u1ebft b\u1ecb b\u1ecb l\u1ed7i, c\u1ea7n ph\u1ea3i \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n v\u00e0 s\u1eeda ch\u1eefa.<\/p>\n

M\u1ed9t c\u1ea7u dao b\u1ecb h\u1ecfng.<\/strong>\u00a0C\u1ea7u dao b\u1ecb h\u1ecfng, b\u1ecb h\u01b0 h\u1ea1i ho\u1eb7c c\u00f3 c\u00e1c khuy\u1ebft t\u1eadt kh\u00e1c. Th\u00e0nh ph\u1ea7n nhi\u1ec7t \u0111\u00e3 di chuy\u1ec3n, c\u00e1c ti\u1ebfp \u0111i\u1ec3m b\u1ecb ch\u00e1y do nhi\u1ec1u l\u1ea7n nh\u1ea5p nh\u00e1y, ho\u1eb7c h\u1ec7 th\u1ed1ng \u0111\u00e3 b\u1ecb h\u01b0 h\u1ea1i. C\u1ea7u dao \u0111ang b\u1ecb h\u1ecfng c\u00f3 th\u1ec3 t\u1eaft \u1edf m\u1ee9c d\u00f2ng \u0111i\u1ec7n th\u1ea5p h\u01a1n nhi\u1ec1u so v\u1edbi m\u1ee9c \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb, \u0111i\u1ec1u n\u00e0y s\u1ebd d\u1eabn \u0111\u1ebfn vi\u1ec7c ng\u1eaft sai, ho\u1eb7c t\u1ec7 h\u01a1n, c\u1ea7u dao c\u00f3 th\u1ec3 kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng ho\u00e0n to\u00e0n. C\u00e1c tri\u1ec7u ch\u1ee9ng h\u1ecfng c\u1ee7a c\u1ea7u dao bao g\u1ed3m \u1ea5m, k\u00eau, ch\u00e1y r\u00f5 r\u1ec7t, l\u1ecfng l\u1ebbo ho\u1eb7c c\u00e1t c\u1ee7a tay c\u1ea7m, ho\u1eb7c ng\u1eaft m\u00e0 kh\u00f4ng c\u00f3 t\u1ea3i. B\u1ea5t k\u1ef3 tri\u1ec7u ch\u1ee9ng n\u00e0o trong s\u1ed1 n\u00e0y cho th\u1ea5y \u0111\u00e3 \u0111\u1ebfn l\u00fac thay th\u1ebf c\u1ea7u dao. \u0110\u1ec3 hi\u1ec3u s\u00e2u h\u01a1n v\u1ec1 ch\u1ee9ng nh\u1eadn v\u00e0 th\u1eed nghi\u1ec7m m\u00e0 m\u1ed9t c\u1ea7u dao ch\u1ea5t l\u01b0\u1ee3ng ph\u1ea3i v\u01b0\u1ee3t qua, b\u00e0i vi\u1ebft c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 c\u00e1c c\u1ea7u dao UL 489<\/a> gi\u1ea3i th\u00edch c\u00e1c ti\u00eau chu\u1ea9n m\u00e0 m\u1ed7i c\u1ea7u dao trong b\u1ea3ng c\u1ee7a b\u1ea1n n\u00ean \u0111\u00e1p \u1ee9ng.<\/p>\n

\"Nguy<\/p>\n

M\u1ed1i nguy th\u1ef1c s\u1ef1: \u0110i\u1ec1u g\u00ec x\u1ea3y ra khi b\u1ea1n li\u00ean t\u1ee5c \u0111\u1eb7t l\u1ea1i<\/h2>\n

M\u1ed7i l\u1ea7n m\u1ed9t c\u1ea7u dao ng\u1eaft<\/strong> v\u00e0 \u0111\u01b0\u1ee3c \u0111\u1eb7t l\u1ea1i m\u00e0 kh\u00f4ng ch\u1ea9n \u0111o\u00e1n nguy\u00ean nh\u00e2n, r\u1ee7i ro t\u0103ng l\u00ean theo nhi\u1ec1u chi\u1ec1u. B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y t\u00f3m t\u1eaft thi\u1ec7t h\u1ea1i t\u00edch l\u0169y m\u00e0 vi\u1ec7c ng\u1eaft l\u1eb7p \u0111i l\u1eb7p l\u1ea1i c\u00f3 th\u1ec3 g\u00e2y ra.<\/p>\n\n\n\n\n\n\n\n\n
R\u1ee7i ro<\/th>\n\u0110i\u1ec1u g\u00ec x\u1ea3y ra<\/th>\nH\u1eadu qu\u1ea3<\/th>\n<\/tr>\n<\/thead>\n
S\u1ef1 \u0103n m\u00f2n ti\u1ebfp x\u00fac<\/strong><\/td>\nM\u1ed7i l\u1ea7n ng\u1eaft d\u01b0\u1edbi t\u1ea3i t\u1ea1o ra m\u1ed9t h\u1ed3 quang l\u00e0m pitting v\u00e0 \u0103n m\u00f2n c\u00e1c ti\u1ebfp \u0111i\u1ec3m h\u1ee3p kim b\u1ea1c b\u00ean trong c\u1ea7u dao<\/td>\nT\u0103ng \u0111i\u1ec7n tr\u1edf ti\u1ebfp x\u00fac, sinh nhi\u1ec7t v\u00e0 cu\u1ed1i c\u00f9ng kh\u00f4ng th\u1ec3 mang d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c ho\u1eb7c ng\u1eaft m\u1ed9t c\u00e1ch \u0111\u00e1ng tin c\u1eady<\/td>\n<\/tr>\n
H\u01b0 h\u1ea1i thanh bus<\/strong><\/td>\nNhi\u1ec7t t\u1eeb m\u1ed9t c\u1ea7u dao b\u1ecb h\u1ecfng ho\u1eb7c m\u1ed9t k\u1ebft n\u1ed1i l\u1ecfng c\u00f3 th\u1ec3 l\u00e0m ch\u00e1y, pitting ho\u1eb7c l\u00e0m tan ch\u1ea3y thanh bus m\u00e0 c\u1ea7u dao g\u1eafn v\u00e0o<\/td>\nB\u1ea3ng \u0111i\u1ec1u khi\u1ec3n tr\u1edf n\u00ean kh\u00f4ng an to\u00e0n; thanh bus kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c s\u1eeda ch\u1eefa v\u00e0 to\u00e0n b\u1ed9 b\u1ea3ng c\u00f3 th\u1ec3 c\u1ea7n ph\u1ea3i thay th\u1ebf<\/td>\n<\/tr>\n
H\u01b0 h\u1ea1i c\u00e1ch \u0111i\u1ec7n<\/strong><\/td>\nC\u00e1c d\u00f2ng \u0111i\u1ec7n qu\u00e1 m\u1ee9c l\u1eb7p \u0111i l\u1eb7p l\u1ea1i l\u00e0m n\u00f3ng d\u00e2y \u0111i\u1ec7n trong t\u01b0\u1eddng, t\u1eeb t\u1eeb l\u00e0m suy gi\u1ea3m c\u00e1ch \u0111i\u1ec7n c\u1ee7a d\u00e2y d\u1eabn<\/td>\nC\u00e1ch \u0111i\u1ec7n gi\u00f2n, n\u1ee9t t\u1ea1o ra \u0111i\u1ec1u ki\u1ec7n cho m\u1ed9t m\u1ea1ch ng\u1eafn ho\u1eb7c m\u1ed9t l\u1ed7i h\u1ed3 quang c\u00f3 th\u1ec3 g\u00e2y ch\u00e1y b\u00ean trong t\u01b0\u1eddng<\/td>\n<\/tr>\n
Ch\u00e1y<\/strong><\/td>\nM\u1ed9t c\u1ea7u dao b\u1ecb h\u1ecfng kh\u00f4ng ng\u1eaft, m\u1ed9t k\u1ebft n\u1ed1i l\u1ecfng g\u00e2y h\u1ed3 quang, ho\u1eb7c m\u1ed9t d\u00e2y b\u1ecb h\u01b0 h\u1ea1i qu\u00e1 nhi\u1ec7t c\u00f3 th\u1ec3 l\u00e0m ch\u00e1y c\u00e1c v\u1eadt li\u1ec7u xung quanh<\/td>\nCh\u00e1y \u0111i\u1ec7n l\u00e0 m\u1ed9t trong nh\u1eefng nguy\u00ean nh\u00e2n h\u00e0ng \u0111\u1ea7u g\u00e2y ra ch\u00e1y nh\u00e0 \u1edf, v\u00e0 c\u00e1c c\u1ea7u dao v\u00e0 m\u1ea1ch b\u1ecb l\u1ed7i l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 \u0111\u00f3ng g\u00f3p \u0111\u00e1ng k\u1ec3. Hi\u1ec7p h\u1ed9i B\u1ea3o v\u1ec7 Ch\u00e1y Qu\u1ed1c gia (NFPA)<\/a> theo d\u00f5i c\u00e1c th\u1ed1ng k\u00ea n\u00e0y h\u00e0ng n\u0103m<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

M\u1ed9t l\u1ea7n ng\u1eaft \u0111i\u1ec7n \u0111\u01a1n l\u1ebb kh\u00f4ng ph\u1ea3i l\u00e0 kh\u00f4ng c\u00f3 nguy hi\u1ec3m n\u1ebfu nguy\u00ean nh\u00e2n r\u00f5 r\u00e0ng v\u00e0 c\u1ea7u dao c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1eb7t l\u1ea1i. R\u1ee7i ro ph\u00e1t sinh v\u1edbi nh\u1eefng l\u1ea7n ng\u1eaft l\u1eb7p \u0111i l\u1eb7p l\u1ea1i, nguy\u00ean nh\u00e2n kh\u00f4ng x\u00e1c \u0111\u1ecbnh, ho\u1eb7c b\u1eb1ng ch\u1ee9ng v\u1ec1 h\u01b0 h\u1ecfng v\u1eadt l\u00fd tr\u00ean c\u1ea7u dao. Do \u0111\u00f3, vi\u1ec7c \u0111\u1eb7t l\u1ea1i c\u1ea7u dao kh\u00f4ng gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 m\u00e0 ch\u1ec9 l\u00e0 ch\u1ea5p nh\u1eadn r\u1ee7i ro.<\/p>\n

\"C\u00e1ch<\/p>\n

C\u00e1ch Kh\u1eafc Ph\u1ee5c C\u1ea7u Dao B\u1ecb Ng\u1eaft Li\u00ean T\u1ee5c<\/h2>\n

S\u1ef1 l\u1eb7p l\u1ea1i kh\u00f4ng ph\u1ea3i l\u00e0 c\u00e1ch ti\u1ebfp c\u1eadn \u0111\u00fang khi x\u1eed l\u00fd m\u1ed9t c\u1ea7u dao li\u00ean t\u1ee5c b\u1ecb ng\u1eaft. C\u00e1c b\u01b0\u1edbc \u0111\u01b0\u1ee3c n\u00eau d\u01b0\u1edbi \u0111\u00e2y s\u1ebd gi\u00fap x\u00e1c \u0111\u1ecbnh nguy\u00ean nh\u00e2n c\u1ee7a v\u1ea5n \u0111\u1ec1 trong h\u1ea7u h\u1ebft c\u00e1c tr\u01b0\u1eddng h\u1ee3p gia \u0111\u00ecnh v\u00e0 x\u00e1c \u0111\u1ecbnh xem b\u1ea1n c\u00f3 c\u1ea7n tham kh\u1ea3o \u00fd ki\u1ebfn c\u1ee7a m\u1ed9t th\u1ee3 \u0111i\u1ec7n hay t\u1ef1 kh\u1eafc ph\u1ee5c t\u00ecnh hu\u1ed1ng.<\/p>\n

    \n
  1. X\u00e1c \u0111\u1ecbnh nh\u1eefng g\u00ec \u0111ang c\u00f3 tr\u00ean m\u1ea1ch.<\/span>\u00a0T\u1eaft c\u1ea7u dao v\u00e0 \u0111i quanh nh\u00e0. Ki\u1ec3m tra t\u1eebng \u1ed5 c\u1eafm v\u00e0 c\u00f4ng t\u1eafc \u0111\u1ec3 xem c\u00e1i n\u00e0o kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng. L\u1eadp danh s\u00e1ch t\u1eebng thi\u1ebft b\u1ecb, \u0111\u00e8n, v\u00e0 d\u1ee5ng c\u1ee5 \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi m\u1ea1ch \u0111\u00f3. C\u1ed9ng t\u1ed5ng c\u00f4ng su\u1ea5t. N\u1ebfu t\u1ed5ng c\u00f4ng su\u1ea5t v\u01b0\u1ee3t qu\u00e1 1.440 watt tr\u00ean m\u1ea1ch 15\u2011amp, 120\u2011volt (ho\u1eb7c t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi \u0111i\u1ec7n \u00e1p v\u00e0 \u0111\u1ecbnh m\u1ee9c amp c\u1ee7a b\u1ea1n), b\u1ea1n c\u00f3 m\u1ed9t t\u00ecnh tr\u1ea1ng qu\u00e1 t\u1ea3i. Di chuy\u1ec3n m\u1ed9t ho\u1eb7c nhi\u1ec1u thi\u1ebft b\u1ecb sang m\u1ea1ch kh\u00e1c v\u00e0 xem li\u1ec7u vi\u1ec7c ng\u1eaft \u0111i\u1ec7n c\u00f3 d\u1eebng l\u1ea1i kh\u00f4ng.<\/li>\n
  2. R\u00fat ph\u00edch c\u1eafm m\u1ecdi th\u1ee9 tr\u00ean m\u1ea1ch.<\/span>\u00a0B\u1eadt c\u1ea7u dao v\u1edbi m\u1ecdi th\u1ee9 \u0111\u00e3 r\u00fat ph\u00edch c\u1eafm v\u00e0 t\u1ea5t c\u1ea3 c\u00f4ng t\u1eafc \u1edf v\u1ecb tr\u00ed t\u1eaft. N\u1ebfu c\u1ea7u dao v\u1eabn b\u1eadt, b\u1ea1n s\u1ebd c\u1ea7n ki\u1ec3m tra thi\u1ebft b\u1ecb n\u00e0o \u0111ang g\u1eb7p s\u1ef1 c\u1ed1. B\u1eaft \u0111\u1ea7u c\u1eafm l\u1ea1i t\u1eebng thi\u1ebft b\u1ecb m\u1ed9t v\u00e0 ch\u1edd v\u00e0i ph\u00fat gi\u1eefa m\u1ed7i l\u1ea7n. Thi\u1ebft b\u1ecb g\u00e2y ra vi\u1ec7c c\u1ea7u dao b\u1ecb ng\u1eaft l\u00e0 b\u1ecb l\u1ed7i v\u00e0 c\u1ea7n \u0111\u01b0\u1ee3c s\u1eeda ch\u1eefa ho\u1eb7c thay th\u1ebf.<\/li>\n
  3. N\u1ebfu c\u1ea7u dao b\u1ecb ng\u1eaft khi kh\u00f4ng c\u00f3 g\u00ec \u0111\u01b0\u1ee3c c\u1eafm v\u00e0 kh\u00f4ng c\u00f3 c\u00f4ng t\u1eafc n\u00e0o b\u1eadt, l\u1ed7i n\u1eb1m \u1edf d\u00e2y \u0111i\u1ec7n ho\u1eb7c ch\u00ednh c\u1ea7u dao.<\/span>\u00a0T\u1eaft c\u1ea7u dao v\u00e0 gi\u1eef nguy\u00ean nh\u01b0 v\u1eady. Kh\u00f4ng n\u00ean t\u1ef1 ch\u1ea9n \u0111o\u00e1n \u2014 ch\u1ec9 c\u00f3 m\u1ed9t th\u1ee3 \u0111i\u1ec7n chuy\u00ean nghi\u1ec7p m\u1edbi c\u00f3 th\u1ec3 ki\u1ec3m tra m\u1ea1ch, ki\u1ec3m tra \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n, v\u00e0 ph\u00e1t hi\u1ec7n xem s\u1ef1 c\u1ed1 c\u00f3 li\u00ean quan \u0111\u1ebfn c\u1ea7u dao, d\u00e2y \u0111i\u1ec7n hay k\u1ebft n\u1ed1i h\u1ed9p n\u1ed1i.<\/li>\n<\/ol>\n

    C\u1ea7u dao c\u1ea7n \u0111\u01b0\u1ee3c thay th\u1ebf n\u1ebfu n\u00f3 n\u00f3ng, k\u00eau ho\u1eb7c c\u00f3 d\u1ea5u hi\u1ec7u c\u1ee7a s\u1ef1 ph\u00f3ng \u0111i\u1ec7n. C\u00e1c c\u1ea7u dao thay th\u1ebf kh\u00f4ng t\u1ed1n k\u00e9m nhi\u1ec1u, ch\u1ec9 t\u1eeb $5 \u0111\u1ebfn $30, so v\u1edbi chi ph\u00ed l\u1edbn ph\u00e1t sinh do b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n b\u1ecb h\u01b0 h\u1ecfng v\u00e0 ch\u00e1y n\u1ed5. Family Handyman l\u00e0 m\u1ed9t ngu\u1ed3n t\u00e0i nguy\u00ean s\u1eeda ch\u1eefa nh\u00e0 qu\u00fd gi\u00e1 n\u1ebfu b\u1ea1n d\u1ef1 \u0111\u1ecbnh th\u1ef1c hi\u1ec7n vi\u1ec7c thay th\u1ebf c\u1ea7u dao an to\u00e0n t\u1ea1i b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n \u0111\u00e3 ng\u1eaft \u0111i\u1ec7n m\u1ed9t c\u00e1ch \u0111\u1ed9c l\u1eadp.<\/p>\n

    Khi C\u1ea7u Dao C\u1ea7n H\u01a1n C\u1ea3 Vi\u1ec7c \u0110\u1eb7t L\u1ea1i<\/h2>\n

    C\u00f3 nh\u1eefng tr\u01b0\u1eddng h\u1ee3p m\u00e0 vi\u1ec7c \u0111\u1eb7t l\u1ea1i c\u1ea7u dao ho\u00e0n to\u00e0n kh\u00f4ng ph\u00f9 h\u1ee3p. N\u1ebfu c\u1ea7u dao b\u1ecb ng\u1eaft ngay khi n\u00f3 tr\u1edf l\u1ea1i v\u1ecb tr\u00ed \u0111\u1eb7t l\u1ea1i v\u00e0 ph\u00e1t ra ti\u1ebfng k\u00eau ho\u1eb7c c\u00f3 tia l\u1eeda, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 c\u00f3 m\u1ed9t m\u1ea1ch ng\u1eafn ho\u1eb7c m\u1ed9t l\u1ed7i n\u1ed1i \u0111\u1ea5t \u0111ang x\u1ea3y ra, v\u00e0 vi\u1ec7c l\u1eb7p l\u1ea1i vi\u1ec7c \u0111\u1eb7t l\u1ea1i c\u00f3 ngh\u0129a l\u00e0 m\u1eddi g\u1ecdi m\u1ed9t v\u1ee5 ph\u00f3ng \u0111i\u1ec7n. N\u1ebfu n\u00f3 n\u00f3ng khi ch\u1ea1m v\u00e0o, n\u1ebfu c\u00f3 m\u00f9i kh\u00e9t, ho\u1eb7c n\u1ebfu c\u1ea7n g\u1ea1t l\u1ecfng l\u1ebbo, c\u1ea7u dao \u0111\u00e3 \u1edf ch\u1ebf \u0111\u1ed9 l\u1ed7i v\u00e0 vi\u1ec7c \u0111\u1eb7t l\u1ea1i c\u00f3 ngh\u0129a l\u00e0 \u0111\u00e1nh c\u01b0\u1ee3c m\u1ed7i l\u1ea7n r\u1eb1ng n\u00f3 s\u1ebd \u0111\u1eb7t l\u1ea1i c\u01a1 ch\u1ebf b\u00ean trong m\u1ed9t l\u1ea7n n\u1eefa. N\u1ebfu vi\u1ec7c c\u1ea7u dao b\u1ecb ng\u1eaft \u0111i k\u00e8m v\u1edbi vi\u1ec7c \u0111\u00e8n nh\u1ea5p nh\u00e1y \u1edf n\u01a1i kh\u00e1c trong nh\u00e0, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 th\u1ec3 c\u00f3 ngh\u0129a l\u00e0 b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n \u0111ang g\u1eb7p s\u1ef1 c\u1ed1 v\u00e0 c\u1ea7n m\u1ed9t chuy\u00ean gia ngay l\u1eadp t\u1ee9c.<\/p>\n

    C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n

    Bao nhi\u00eau l\u1ea7n m\u1ed9t c\u1ea7u dao c\u00f3 th\u1ec3 b\u1ecb ng\u1eaft tr\u01b0\u1edbc khi n\u00f3 h\u1ecfng?<\/h3>\n

    Kh\u00f4ng c\u00f3 s\u1ed1 l\u01b0\u1ee3ng c\u1ed1 \u0111\u1ecbnh n\u00e0o li\u00ean quan \u0111\u1ebfn v\u1ea5n \u0111\u1ec1 n\u00e0y. M\u1ed9t c\u1ea7u dao \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ch\u1ecbu \u0111\u1ef1ng m\u1ed9t s\u1ed1 l\u1ea7n ng\u1eaft d\u00f2ng ng\u1eafn m\u1ea1ch v\u1edbi c\u00f4ng su\u1ea5t \u0111\u1ea7y \u0111\u1ee7, th\u01b0\u1eddng l\u00e0 2 ho\u1eb7c 3 l\u1ea7n, sau \u0111\u00f3 c\u00e1c ti\u1ebfp \u0111i\u1ec3m c\u1ee7a n\u00f3 c\u00f3 th\u1ec3 b\u1ecb m\u00f2n qu\u00e1 m\u1ee9c \u0111\u1ec3 mang t\u1ea3i m\u1ed9t c\u00e1ch an to\u00e0n. M\u1ed9t c\u1ea7u dao b\u1ecb ng\u1eaft do qu\u00e1 t\u1ea3i c\u00f3 th\u1ec3 \u0111\u00e3 l\u00e0m cho c\u00e1c y\u1ebfu t\u1ed1 nhi\u1ec7t c\u1ee7a n\u00f3 b\u1ecb tr\u00f4i qu\u00e1 xa. B\u1ea5t k\u1ef3 c\u1ea7u dao n\u00e0o \u1ea5m khi ch\u1ea1m v\u00e0o, ph\u00e1t ra ti\u1ebfng k\u00eau ho\u1eb7c c\u00f3 d\u1ea5u hi\u1ec7u h\u01b0 h\u1ecfng r\u00f5 r\u00e0ng \u0111\u1ec1u n\u00ean \u0111\u01b0\u1ee3c thay th\u1ebf, b\u1ea5t k\u1ec3 s\u1ed1 l\u1ea7n ng\u1eaft.<\/p>\n

    L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 s\u1eeda m\u1ed9t c\u1ea7u dao li\u00ean t\u1ee5c b\u1ecb ng\u1eaft?<\/h3>\n

    T\u00ecm v\u00e0 s\u1eeda ch\u1eefa ngu\u1ed3n g\u1ed1c c\u1ee7a vi\u1ec7c ng\u1eaft. N\u1ebfu do qu\u00e1 t\u1ea3i m\u1ea1ch, h\u00e3y s\u1eed d\u1ee5ng c\u00e1c m\u1ea1ch thay th\u1ebf cho c\u00e1c thi\u1ebft b\u1ecb. N\u1ebfu do m\u1ed9t thi\u1ebft b\u1ecb \u0111\u01a1n l\u1ebb, h\u00e3y s\u1eeda ch\u1eefa ho\u1eb7c thay th\u1ebf n\u00f3. N\u1ebfu n\u00f3 b\u1ecb ng\u1eaft m\u00e0 kh\u00f4ng c\u00f3 t\u1ea3i ho\u1eb7c c\u00f3 khuy\u1ebft t\u1eadt trong c\u1ea7u dao, h\u00e3y g\u1ecdi m\u1ed9t th\u1ee3 \u0111i\u1ec7n c\u00f3 gi\u1ea5y ph\u00e9p \u0111\u1ec3 \u0111i\u1ec1u tra v\u00e0 thay th\u1ebf n\u1ebfu c\u1ea7n. Ch\u1ec9 vi\u1ec7c li\u00ean t\u1ee5c \u0111\u1eb7t l\u1ea1i n\u00f3 l\u00e0 kh\u00f4ng \u0111\u1ee7.<\/p>\n

    M\u1ed9t c\u1ea7u dao li\u00ean t\u1ee5c b\u1ecb ng\u1eaft c\u00f3 th\u1ec3 g\u00e2y ra h\u1ecfa ho\u1ea1n kh\u00f4ng?<\/h3>\n

    Ch\u1eafc ch\u1eafn r\u1ed3i. Vi\u1ec7c m\u1ed9t c\u1ea7u dao li\u00ean t\u1ee5c nh\u1ea3y l\u00e0 d\u1ea5u hi\u1ec7u c\u1ee7a qu\u00e1 t\u1ea3i, s\u1ef1 c\u1ed1 ho\u1eb7c c\u1ea7u dao b\u1ecb h\u1ecfng. M\u1ed7i t\u00ecnh hu\u1ed1ng n\u00e0y \u0111\u1ec1u t\u1ea1o ra nhi\u1ec7t g\u00e2y h\u01b0 h\u1ea1i kh\u00f4ng ch\u1ec9 cho c\u1ea7u dao m\u00e0 c\u00f2n cho d\u00e2y \u0111i\u1ec7n v\u00e0 b\u1ea3ng \u0111i\u1ec7n. M\u1ed9t c\u1ea7u dao b\u1ecb h\u1ecfng m\u00e0 l\u1ebd ra ph\u1ea3i nh\u1ea3y, ho\u1eb7c m\u1ed9t k\u1ebft n\u1ed1i l\u1ecfng \u0111ang ph\u00e1t tia l\u1eeda, c\u00f3 th\u1ec3 tr\u1edf th\u00e0nh nguy c\u01a1 ch\u00e1y n\u1ed5. Vi\u1ec7c c\u1ea7u dao nh\u1ea3y th\u01b0\u1eddng xuy\u00ean kh\u00f4ng th\u1ec3 b\u1ecb b\u1ecf qua.<\/p>\n

    T\u00f4i c\u00f3 n\u00ean lo l\u1eafng n\u1ebfu c\u1ea7u dao nh\u1ea3y kh\u00f4ng?<\/h3>\n

    M\u1ed9t s\u1ef1 ki\u1ec7n ri\u00eang l\u1ebb m\u00e0 nguy\u00ean nh\u00e2n c\u1ee7a s\u1ef1 t\u0103ng \u0111i\u1ec7n r\u00f5 r\u00e0ng \u2014 ch\u1eb3ng h\u1ea1n nh\u01b0 qu\u00e1 t\u1ea3i m\u1ea1ch do k\u1ebft n\u1ed1i qu\u00e1 nhi\u1ec1u thi\u1ebft b\u1ecb \u2014 th\u1ef1c s\u1ef1 kh\u00f4ng ph\u1ea3i l\u00e0 \u0111i\u1ec1u \u0111\u00e1ng lo ng\u1ea1i, nh\u01b0ng n\u00f3 cho th\u1ea5y b\u1ea1n \u0111ang g\u1ea7n \u0111\u1ebfn gi\u1edbi h\u1ea1n ngu\u1ed3n \u0111i\u1ec7n c\u1ee7a m\u1ea1ch. Nh\u01b0ng n\u1ebfu c\u1ea7u dao b\u1eaft \u0111\u1ea7u nh\u1ea3y li\u00ean t\u1ee5c, nh\u1ea3y kh\u00f4ng r\u00f5 l\u00fd do, ho\u1eb7c nh\u1ea3y nhanh k\u00e8m theo ti\u1ebfng n\u1ed5 l\u1edbn v\u00e0 tia l\u1eeda, b\u1ea1n n\u00ean cho th\u1ee3 \u0111i\u1ec7n ki\u1ec3m tra v\u1ea5n \u0111\u1ec1.<\/p>\n

    T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h2>\n