{"id":3121,"date":"2026-07-18T12:50:47","date_gmt":"2026-07-18T12:50:47","guid":{"rendered":"https:\/\/huyuglobal.com\/?p=3121"},"modified":"2026-07-18T12:50:49","modified_gmt":"2026-07-18T12:50:49","slug":"circuit-breaker-and-ground-fault-circuit-interrupter","status":"publish","type":"post","link":"https:\/\/huyuglobal.com\/vi\/blog\/circuit-breaker-and-ground-fault-circuit-interrupter\/","title":{"rendered":"B\u1ed9 ng\u1eaft m\u1ea1ch v\u00e0 b\u1ed9 ng\u1eaft m\u1ea1ch l\u1ed7i \u0111\u1ea5t: Hi\u1ec3u v\u1ec1 hai l\u1edbp b\u1ea3o v\u1ec7 \u0111i\u1ec7n"},"content":{"rendered":"

Khi nh\u1ea5n n\u00fat TEST tr\u00ean \u1ed5 c\u1eafm GFCI trong ph\u00f2ng t\u1eafm \u1edf Seattle c\u1ee7a c\u00f4 \u1ea5y, m\u1ed9t ch\u1ee7 nh\u00e0 \u0111\u00e3 ph\u00e1t hi\u1ec7n ra r\u1eb1ng kh\u00f4ng c\u00f3 ph\u1ea3n h\u1ed3i n\u00e0o. \u1ed4 c\u1eafm tr\u00f4ng gi\u1ed1ng nh\u01b0 m\u1ecdi \u1ed5 c\u1eafm ch\u1ed1ng x\u00e2m nh\u1eadp kh\u00e1c trong nh\u00e0, nh\u01b0ng m\u1ea1ch c\u1ea3m bi\u1ebfn b\u00ean trong d\u01b0\u1eddng nh\u01b0 \u0111\u00e3 h\u1ecfng t\u1eeb kh\u00e1 l\u00e2u. Do \u0111\u00f3, m\u1eb7c d\u00f9 GFCI \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea5p ngu\u1ed3n \u0111i\u1ec7n trong nhi\u1ec1u tu\u1ea7n ho\u1eb7c nhi\u1ec1u th\u00e1ng, n\u00f3 v\u1eabn cung c\u1ea5p \u0111i\u1ec7n m\u00e0 kh\u00f4ng c\u00f3 b\u1ea5t k\u1ef3 b\u1ea3o v\u1ec7 n\u00e0o ch\u1ed1ng l\u1ea1i l\u1ed7i n\u1ed1i \u0111\u1ea5t. Trong b\u1ea3ng \u0111i\u1ec7n, m\u1ed9t c\u1ea7u dao nhi\u1ec7t t\u1eeb 20-amp \u0111ang ho\u1ea1t \u0111\u1ed9ng ho\u00e0n h\u1ea3o. Tuy nhi\u00ean, n\u00f3 kh\u00f4ng th\u1ec3 ph\u00e1t hi\u1ec7n lo\u1ea1i l\u1ed7i m\u00e0 GFCI \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 b\u1ea3o v\u1ec7. Do \u0111\u00f3, m\u1ed1i quan h\u1ec7 sau \u0111\u00e2y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp v\u1ec1 ch\u1ee9c n\u0103ng c\u1ee7a ch\u00fang: c\u1ea7u dao b\u1ea3o v\u1ec7 d\u00e2y v\u00e0 c\u1ea5u tr\u00fac kh\u1ecfi qu\u00e1 t\u1ea3i v\u00e0 ng\u1eafn m\u1ea1ch, trong khi GFCI b\u1ea3o v\u1ec7 con ng\u01b0\u1eddi kh\u1ecfi \u0111i\u1ec7n gi\u1eadt, \u0111i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 c\u00e1c thi\u1ebft b\u1ecb tr\u00ean kh\u00f4ng th\u1ec3 thay th\u1ebf cho nhau.<\/p>\n

Nh\u1eefng g\u00ec m\u1ed7i thi\u1ebft b\u1ecb th\u1ef1c hi\u1ec7n: B\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng so v\u1edbi B\u1ea3o v\u1ec7 l\u1ed7i n\u1ed1i \u0111\u1ea5t<\/h2>\n

\"Ch\u1ee9c<\/p>\n

Thu\u1eadt ng\u1eef cho m\u1ed9t c\u1ea7u dao c\u01a1 b\u1ea3n l\u00e0 c\u1ea7u dao mini (MCB) ho\u1eb7c c\u1ea7u dao v\u1ecf \u0111\u00fac (MCCB). N\u00f3 \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn nh\u01b0 m\u1ed9t c\u01a1 ch\u1ebf b\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng. N\u00f3 ho\u1ea1t \u0111\u1ed9ng t\u1ef1 \u0111\u1ed9ng b\u1eb1ng c\u00e1ch t\u1eaft m\u1ea1ch khi c\u00f3 qu\u00e1 t\u1ea3i, trong \u0111\u00f3 m\u1ed9t s\u1ed1 s\u1ea3n ph\u1ea9m \u0111i\u1ec7n c\u00f3 th\u1ec3 r\u00fat nhi\u1ec1u d\u00f2ng \u0111i\u1ec7n h\u01a1n m\u1ee9c d\u00e2y c\u00f3 th\u1ec3 cung c\u1ea5p. Khi c\u00f3 ng\u1eafn m\u1ea1ch, \u0111\u00f3 l\u00e0 khi c\u00e1c d\u00e2y \u0111i\u1ec7n ch\u1ea1m v\u00e0o nhau, trong \u0111\u00f3 c\u00f3 m\u1ed9t m\u1ea1ch m\u1edf. C\u1ea7u dao t\u1ea1o ra m\u1ed9t hi\u1ec7u \u1ee9ng b\u1ea3o v\u1ec7 m\u1ed9t \u0111\u01b0\u1eddng d\u00e2y \u0111i\u1ec7n, thi\u1ebft b\u1ecb v\u00e0 t\u00e0i s\u1ea3n kh\u1ecfi b\u1ecb ch\u00e1y.
\nN\u00f3 th\u1ef1c hi\u1ec7n \u0111i\u1ec1u n\u00e0y b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng hai c\u01a1 ch\u1ebf; m\u1ed9t trong s\u1ed1 \u0111\u00f3 l\u00e0 d\u1ea3i bimetal, trong \u0111\u00f3 khi c\u00f3 qu\u00e1 t\u1ea3i, d\u1ea3i bimetal u\u1ed1n cong d\u01b0\u1edbi nhi\u1ec7t v\u00e0 k\u00edch ho\u1ea1t c\u1ea7u dao t\u1eaft. V\u1edbi m\u1ed9t c\u1ea7u dao \u0111\u01a1n gi\u1ea3n, c\u1ea7u dao kh\u00f4ng th\u1ec3 ph\u00e1t hi\u1ec7n b\u1ea5t k\u1ef3 d\u00f2ng \u0111i\u1ec7n n\u00e0o \u0111ang r\u00f2 r\u1ec9 qua \u0111\u1ea5t. N\u00f3 c\u00f3 th\u1ec3 kh\u00f4ng ph\u00e1t hi\u1ec7n \u0111\u01b0\u1ee3c d\u00f2ng \u0111i\u1ec7n c\u00f3 th\u1ec3 \u0111i qua m\u1ed9t ng\u01b0\u1eddi ho\u1eb7c th\u1eadm ch\u00ed qua n\u01b0\u1edbc. C\u0169ng \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ee9ng minh r\u1eb1ng n\u1ebfu m\u1ed9t ng\u01b0\u1eddi ch\u1ea1m v\u00e0o m\u1ed9t d\u00e2y \u0111i\u1ec7n \u0111ang c\u00f3 \u0111i\u1ec7n, d\u00f2ng \u0111i\u1ec7n \u0111i qua ng\u01b0\u1eddi \u0111\u00f3 kho\u1ea3ng 10 \u0111\u1ebfn 30 miliampe. \u0110\u00e2y l\u00e0 m\u1ed9t con s\u1ed1 \u0111\u00e1ng k\u1ec3 c\u00f3 th\u1ec3 g\u00e2y ra rung th\u1ea5t th\u1ea5t t\u00e2m th\u1ea5t v\u00e0 c\u00e1i ch\u1ebft cu\u1ed1i c\u00f9ng nh\u01b0ng ch\u1eafc ch\u1eafn kh\u00f4ng \u0111\u1ee7 d\u00f2ng \u0111i\u1ec7n \u0111\u1ec3 k\u00edch ho\u1ea1t c\u1ea7u dao. T\u00e0i nguy\u00ean t\u1eeb Qu\u1ef9 An to\u00e0n \u0110i\u1ec7n Qu\u1ed1c t\u1ebf (ESFI)<\/a> gi\u1ea3i th\u00edch r\u1eb1ng ng\u01b0\u1ee1ng cho s\u1ed1c ch\u1ebft ng\u01b0\u1eddi kho\u1ea3ng 50 miliampe, th\u1ea5p h\u01a1n nhi\u1ec1u so v\u1edbi ng\u01b0\u1ee1ng k\u00edch ho\u1ea1t c\u1ee7a b\u1ea5t k\u1ef3 c\u1ea7u dao ti\u00eau chu\u1ea9n n\u00e0o, \u0111\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao b\u1ea3o v\u1ec7 b\u1ed5 sung l\u00e0 c\u1ea7n thi\u1ebft \u1edf nh\u1eefng n\u01a1i \u1ea9m \u01b0\u1edbt v\u00e0 ngo\u00e0i tr\u1eddi.<\/p>\n

B\u1ed9 ng\u1eaft m\u1ea1ch l\u1ed7i \u0111\u1ea5t (GFCI), c\u00f2n \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn l\u00e0 thi\u1ebft b\u1ecb d\u00f2ng \u0111i\u1ec7n d\u01b0 (RCD) t\u1ea1i V\u01b0\u01a1ng qu\u1ed1c Anh v\u00e0 c\u00e1c th\u1ecb tr\u01b0\u1eddng IEC, l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb an to\u00e0n m\u1ea1ch \u0111i\u1ec7n nh\u1eadn bi\u1ebft s\u1ef1 thay \u0111\u1ed5i trong d\u00f2ng \u0111i\u1ec7n qua d\u00e2y n\u00f3ng v\u00e0 d\u00e2y trung t\u00ednh. N\u00f3i c\u00e1ch kh\u00e1c, c\u1ea3 hai d\u00f2ng \u0111i\u1ec7n ho\u1ea1t \u0111\u1ed9ng nh\u01b0 nhau trong m\u1ed9t m\u1ea1ch ch\u1ee9c n\u0103ng. L\u00fd t\u01b0\u1edfng l\u00e0 khi ai \u0111\u00f3 ch\u1ea1m v\u00e0o m\u1ed9t d\u00e2y \u0111i\u1ec7n, m\u1ed9t ph\u1ea7n c\u1ee7a d\u00f2ng \u0111i\u1ec7n \u0111i v\u00e0o \u0111\u1ea5t qua c\u01a1 th\u1ec3 thay v\u00ec tr\u1edf v\u1ec1 qua d\u00e2y trung t\u00ednh. GFCI nh\u1eadn di\u1ec7n s\u1ef1 bi\u1ebfn \u0111\u1ed5i n\u00e0y \u2014 th\u01b0\u1eddng \u1edf gi\u00e1 tr\u1ecb 5 mA (0.005 amp) t\u1ea1i M\u1ef9, ho\u1eb7c 30 mA (0.030 amp) trong m\u1ed9t s\u1ed1 RCD IEC \u2014 v\u00e0 ngay l\u1eadp t\u1ee9c t\u1eaft m\u1ea1ch. Tuy nhi\u00ean, n\u00f3 kh\u00f4ng cung c\u1ea5p b\u1ea3o v\u1ec7 ch\u1ed1ng qu\u00e1 t\u1ea3i ho\u1eb7c ng\u1eafn m\u1ea1ch v\u00e0 ph\u1ea3i \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi m\u1ed9t b\u1ed9 ng\u1eaft m\u1ea1ch v\u00e0 c\u1ea7u ch\u00ec ch\u1ecbu tr\u00e1ch nhi\u1ec7m b\u1ea3o v\u1ec7 d\u00e2y d\u1eabn trong tr\u01b0\u1eddng h\u1ee3p qu\u00e1 d\u00f2ng. \u0110\u1ec3 hi\u1ec3u s\u00e2u h\u01a1n v\u1ec1 khung ch\u1ee9ng nh\u1eadn \u0111i\u1ec1u ch\u1ec9nh c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch n\u1eb1m c\u1ea1nh GFCI trong m\u1ed9t b\u1ea3ng, 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 y\u00eau c\u1ea7u th\u1eed nghi\u1ec7m v\u00e0 li\u1ec7t k\u00ea cho c\u1ea3 b\u1ed9 ng\u1eaft m\u1ea1ch ti\u00eau chu\u1ea9n v\u00e0 \u0111\u1eb7c bi\u1ec7t.<\/p>\n

\"MCB<\/p>\n

C\u00e1ch so s\u00e1nh hai thi\u1ebft b\u1ecb: Tham kh\u1ea3o song song<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n
\u0110\u1eb7c \u0111i\u1ec3m<\/th>\nB\u1ed9 ng\u1eaft m\u1ea1ch ti\u00eau chu\u1ea9n (MCB)<\/th>\nGFCI (RCD)<\/th>\n<\/tr>\n<\/thead>\n
B\u1ea3o v\u1ec7 ch\u00ednh<\/strong><\/td>\nQu\u00e1 t\u1ea3i v\u00e0 ng\u1eafn m\u1ea1ch \u2014 b\u1ea3o v\u1ec7 d\u00e2y d\u1eabn, thi\u1ebft b\u1ecb v\u00e0 t\u00f2a nh\u00e0 kh\u1ecfi h\u1ecfa ho\u1ea1n<\/td>\nL\u1ed7i \u0111\u1ea5t (r\u00f2 r\u1ec9 \u0111\u1ea5t) \u2014 b\u1ea3o v\u1ec7 con ng\u01b0\u1eddi kh\u1ecfi \u0111i\u1ec7n gi\u1eadt<\/td>\n<\/tr>\n
Ng\u01b0\u1ee1ng ng\u1eaft<\/strong><\/td>\n15A, 20A, 30A, v.v. \u2014 ng\u1eaft khi d\u00f2ng \u0111i\u1ec7n v\u01b0\u1ee3t qu\u00e1 gi\u00e1 tr\u1ecb \u0111\u1ecbnh m\u1ee9c<\/td>\n5 mA (B\u1eafc M\u1ef9, b\u1ea3o v\u1ec7 c\u00e1 nh\u00e2n) ho\u1eb7c 30 mA (c\u00e1c th\u1ecb tr\u01b0\u1eddng IEC, b\u1ea3o v\u1ec7 c\u00e1 nh\u00e2n); \u0111\u1ecbnh m\u1ee9c cao h\u01a1n cho b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb<\/td>\n<\/tr>\n
Ph\u00e1t hi\u1ec7n m\u1ed9t ng\u01b0\u1eddi nh\u1eadn \u0111i\u1ec7n gi\u1eadt?<\/strong><\/td>\nKh\u00f4ng. D\u00f2ng \u0111i\u1ec7n ch\u1ea3y qua m\u1ed9t ng\u01b0\u1eddi (th\u01b0\u1eddng l\u00e0 10\u201330 mA) th\u1ea5p h\u01a1n nhi\u1ec1u so v\u1edbi ng\u01b0\u1ee1ng ng\u1eaft c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch<\/td>\nC\u00f3. Ng\u1eaft trong v\u00f2ng mili gi\u00e2y khi d\u00f2ng \u0111i\u1ec7n r\u00f2 r\u1ec9 \u0111\u1ea1t \u0111\u1ed9 nh\u1ea1y \u0111\u1ecbnh m\u1ee9c<\/td>\n<\/tr>\n
Ph\u00e1t hi\u1ec7n m\u1ed9t ng\u1eafn m\u1ea1ch?<\/strong><\/td>\nC\u00f3 \u2014 c\u01a1 ch\u1ebf ng\u1eaft t\u1eeb t\u00ednh ph\u1ea3n \u1ee9ng ngay l\u1eadp t\u1ee9c v\u1edbi d\u00f2ng \u0111i\u1ec7n l\u1ed7i cao<\/td>\nKh\u00f4ng. M\u1ed9t GFCI kh\u00f4ng c\u00f3 ch\u1ee9c n\u0103ng qu\u00e1 d\u00f2ng t\u00edch h\u1ee3p ph\u1ea3i \u0111\u01b0\u1ee3c gh\u00e9p n\u1ed1i v\u1edbi m\u1ed9t b\u1ed9 ng\u1eaft m\u1ea1ch ho\u1eb7c c\u1ea7u ch\u00ec<\/td>\n<\/tr>\n
V\u1ecb tr\u00ed l\u1eafp \u0111\u1eb7t \u0111i\u1ec3n h\u00ecnh<\/strong><\/td>\nM\u1ed7i m\u1ea1ch trong b\u1ea3ng \u2014 chi\u1ebfu s\u00e1ng, \u1ed5 c\u1eafm, thi\u1ebft b\u1ecb<\/td>\nPh\u00f2ng t\u1eafm, b\u1ebfp, gara, ngo\u00e0i tr\u1eddi, kh\u00f4ng gian crawl, khu v\u1ef1c gi\u1eb7t \u2014 b\u1ea5t k\u1ef3 v\u1ecb tr\u00ed n\u00e0o m\u00e0 n\u01b0\u1edbc v\u00e0 \u0111i\u1ec7n g\u1ea7n nhau<\/td>\n<\/tr>\n
H\u00ecnh th\u1ee9c v\u1eadt l\u00fd<\/strong><\/td>\nG\u1eafn tr\u00ean thanh DIN (MCB) ho\u1eb7c c\u1eafm v\u00e0o thanh bus c\u1ee7a b\u1ea3ng; c\u0169ng c\u00f3 s\u1eb5n d\u01b0\u1edbi d\u1ea1ng b\u1ed9 ng\u1eaft m\u1ea1ch GFCI k\u1ebft h\u1ee3p c\u1ea3 hai ch\u1ee9c n\u0103ng<\/td>\nLo\u1ea1i \u1ed5 c\u1eafm (\u1ed5 \u0111i\u1ec7n t\u01b0\u1eddng v\u1edbi n\u00fat TEST v\u00e0 RESET), di \u0111\u1ed9ng (c\u1eafm v\u00e0o), ho\u1eb7c g\u1eafn tr\u00ean thanh DIN (RCD\/RCBO cho b\u1ea3ng ph\u00e2n ph\u1ed1i)<\/td>\n<\/tr>\n
Chi ph\u00ed (kho\u1ea3ng, m\u1ed7i \u0111\u01a1n v\u1ecb)<\/strong><\/td>\n$5\u2013$50 t\u00f9y thu\u1ed9c v\u00e0o s\u1ed1 c\u1ef1c, \u0111\u1ecbnh m\u1ee9c v\u00e0 kh\u1ea3 n\u0103ng ng\u1eaft<\/td>\n$10\u2013$25 (lo\u1ea1i \u1ed5 c\u1eafm); $30\u2013$80 (b\u1ed9 ng\u1eaft m\u1ea1ch GFCI); $20\u2013$60 (RCD\/RCBO g\u1eafn tr\u00ean thanh DIN)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

N\u01a1i m\u1ed7i thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u \u2014 v\u00e0 n\u01a1i ch\u00fang ph\u1ea3i ho\u1ea1t \u0111\u1ed9ng c\u00f9ng nhau<\/h2>\n

M\u1ed7i l\u1eafp \u0111\u1eb7t \u0111i\u1ec7n \u0111\u1ec1u c\u00f3 c\u1ea7u dao ti\u00eau chu\u1ea9n c\u1ee7a n\u00f3. M\u1ed7i m\u1ea1ch ch\u1ee9a y\u1ebfu t\u1ed1 thi\u1ebft y\u1ebfu n\u00e0y c\u1ee7a b\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng, n\u1ebfu kh\u00f4ng c\u00f3 n\u00f3, b\u1ea5t k\u1ef3 m\u1ea1ch n\u00e0o c\u0169ng l\u00e0 b\u1ea5t h\u1ee3p ph\u00e1p. B\u1ed9 lu\u1eadt \u0110i\u1ec7n Qu\u1ed1c gia (NEC) quy \u0111\u1ecbnh r\u1eb1ng GFCI n\u00ean \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u1edf nh\u1eefng khu v\u1ef1c c\u1ee5 th\u1ec3 c\u00f3 nguy c\u01a1 x\u1ea3y ra l\u1ed7i \u0111\u1ea5t, nh\u01b0 ph\u00f2ng t\u1eafm, nh\u00e0 b\u1ebfp, gara, \u1ed5 c\u1eafm ngo\u00e0i tr\u1eddi, kh\u00f4ng gian crawlspace, ph\u00f2ng gi\u1eb7t v\u00e0 b\u1ea5t k\u1ef3 \u0111\u00e2u trong v\u00f2ng s\u00e1u feet t\u1eeb b\u1ed3n r\u1eeda. B\u1ea3o v\u1ec7 RCD 30 mA l\u00e0 b\u1eaft bu\u1ed9c tr\u00ean t\u1ea5t c\u1ea3 c\u00e1c m\u1ea1ch cu\u1ed1i c\u00f9ng trong c\u00e1c t\u00f2a nh\u00e0 d\u00e2n c\u01b0 \u1edf V\u01b0\u01a1ng qu\u1ed1c Anh v\u00e0 \u1edf nhi\u1ec1u qu\u1ed1c gia IEC, mang l\u1ea1i cho c\u01b0 d\u00e2n s\u1ef1 b\u1ea3o v\u1ec7 to\u00e0n di\u1ec7n h\u01a1n so v\u1edbi c\u00e1ch ti\u1ebfp c\u1eadn h\u1ea1n ch\u1ebf h\u01a1n c\u1ee7a B\u1eafc M\u1ef9, ch\u1ec9 b\u1ea3o v\u1ec7 c\u00e1c khu v\u1ef1c c\u00f3 nguy c\u01a1 cao.<\/p>\n

C\u1ea3 hai thi\u1ebft b\u1ecb ph\u1ea3i \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ed3ng th\u1eddi cho b\u1ea5t k\u1ef3 m\u1ea1ch n\u00e0o c\u1ea7n b\u1ea3o v\u1ec7 GFCI. S\u1eafp x\u1ebfp truy\u1ec1n th\u1ed1ng li\u00ean quan \u0111\u1ebfn vi\u1ec7c c\u00f3 m\u1ed9t \u1ed5 c\u1eafm GFCI \u1edf \u1ed5 c\u1eafm \u0111\u1ea7u ti\u00ean tr\u00ean m\u1ea1ch \u0111\u01b0\u1ee3c n\u1ed1i \u0111\u1ec3 b\u1ea3o v\u1ec7 t\u1ea5t c\u1ea3 c\u00e1c \u1ed5 c\u1eafm ti\u1ebfp theo b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c \u0111\u1ea7u n\u1ed1i T\u1ea2I c\u1ee7a n\u00f3, trong khi to\u00e0n b\u1ed9 m\u1ea1ch \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 b\u1eb1ng m\u1ed9t c\u1ea7u dao th\u00f4ng th\u01b0\u1eddng trong b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n. Ngo\u00e0i ra, ng\u01b0\u1eddi ta c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u1ed9t c\u1ea7u dao GFCI k\u1ebft h\u1ee3p c\u00e1c ch\u1ee9c n\u0103ng c\u1ee7a c\u1ea7u dao v\u00e0 b\u1ed9 ph\u00e1t hi\u1ec7n l\u1ed7i \u0111\u1ea5t trong qu\u00e1 tr\u00ecnh l\u1eafp \u0111\u1eb7t thi\u1ebft b\u1ecb GFCI. T\u00f9y ch\u1ecdn n\u00e0y thanh l\u1ecbch h\u01a1n v\u00e0 th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u01b0a chu\u1ed9ng cho c\u00e1c c\u00f4ng tr\u00ecnh x\u00e2y d\u1ef1ng m\u1edbi. D\u00f2ng s\u1ea3n ph\u1ea9m c\u1ee7a HUYU bao g\u1ed3m c\u1ea3 MCB ti\u00eau chu\u1ea9n cho b\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng v\u00e0 <\/span>RCBO (C\u1ea7u dao d\u00f2ng r\u00f2 v\u1edbi qu\u00e1 d\u00f2ng)<\/strong>, ch\u1eb3ng h\u1ea1n nh\u01b0 <\/span>HUM18LE\u201163 RCBO<\/a>, k\u1ebft h\u1ee3p c\u00e1c ch\u1ee9c n\u0103ng c\u1ee7a m\u1ed9t MCB v\u00e0 m\u1ed9t RCD trong m\u1ed9t thi\u1ebft b\u1ecb DIN-rail duy nh\u1ea5t. \u0110\u00e2y l\u00e0 s\u1ef1 b\u1ea3o v\u1ec7 ho\u00e0n ch\u1ec9nh nh\u1ea5t cho m\u1ed9t m\u1ea1ch cu\u1ed1i c\u00f9ng \u0111\u01a1n l\u1ebb: qu\u00e1 t\u1ea3i, ng\u1eafn m\u1ea1ch v\u00e0 r\u00f2 r\u1ec9 \u0111\u1ea5t, t\u1ea5t c\u1ea3 trong m\u1ed9t thi\u1ebft b\u1ecb chi\u1ebfm c\u00f9ng m\u1ed9t kh\u00f4ng gian nh\u01b0 m\u1ed9t MCB ti\u00eau chu\u1ea9n.<\/span><\/p>\n

\u0110i\u1ec1u g\u00ec x\u1ea3y ra khi m\u1ed9t GFCI h\u1ecfng<\/h2>\n

GFCI \u0111\u01b0\u1ee3c c\u1ea5u t\u1ea1o t\u1eeb nhi\u1ec1u th\u00e0nh ph\u1ea7n: m\u1ed9t b\u1ea3ng m\u1ea1ch \u0111i\u1ec7n, m\u1ed9t cu\u1ed9n c\u1ea3m \u1ee9ng v\u00e0 m\u1ed9t r\u01a1 le. B\u1ea5t k\u1ef3 m\u1ed9t trong nh\u1eefng b\u1ed9 ph\u1eadn n\u00e0y c\u00f3 th\u1ec3 h\u1ecfng do tu\u1ed5i t\u00e1c, \u0111\u1ed9 \u1ea9m, s\u1ef1 t\u0103ng v\u1ecdt \u0111i\u1ec7n \u00e1p, ho\u1eb7c \u0111\u01a1n gi\u1ea3n l\u00e0 hao m\u00f2n do s\u1eed d\u1ee5ng trong nhi\u1ec1u n\u0103m. S\u1ef1 c\u1ed1 c\u00f3 th\u1ec3 x\u1ea3y ra trong GFCI m\u00e0 kh\u00f4ng nh\u1ea5t thi\u1ebft ph\u1ea3i t\u1eaft ngu\u1ed3n: GFCI c\u00f3 th\u1ec3 ti\u1ebfp t\u1ee5c ho\u1ea1t \u0111\u1ed9ng trong khi ch\u1ee9c n\u0103ng ph\u00e1t hi\u1ec7n l\u1ed7i \u0111\u1ea5t c\u1ee7a n\u00f3 ng\u1eebng ho\u1ea1t \u0111\u1ed9ng. B\u1eb1ng c\u00e1ch nh\u1ea5n n\u00fat TEST, ng\u01b0\u1eddi ta c\u00f3 th\u1ec3 bi\u1ebft r\u1eb1ng n\u00fat n\u00e0y c\u00f3 th\u1ec3 kh\u00f4ng l\u00e0m g\u00ec ho\u1eb7c k\u00edch ho\u1ea1t thi\u1ebft b\u1ecb nh\u01b0ng kh\u00f4ng \u0111\u1eb7t l\u1ea1i \u0111\u01b0\u1ee3c. M\u1ed9t GFCI b\u1ecb k\u00edch ho\u1ea1t m\u00e0 kh\u00f4ng c\u00f3 t\u1ea3i ho\u1eb7c n\u00fat TEST c\u1ee7a n\u00f3 kh\u00f4ng k\u00edch ho\u1ea1t ho\u00e0n to\u00e0n th\u00ec kh\u00f4ng c\u00f2n ho\u1ea1t \u0111\u1ed9ng v\u00e0 n\u00ean \u0111\u01b0\u1ee3c thay th\u1ebf. NEC v\u00e0 c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t cho bi\u1ebft r\u1eb1ng GFCI n\u00ean \u0111\u01b0\u1ee3c ki\u1ec3m tra m\u1ed9t l\u1ea7n m\u1ed7i th\u00e1ng b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng n\u00fat TEST. M\u1ed9t thi\u1ebft b\u1ecb kh\u00f4ng k\u00edch ho\u1ea1t ph\u1ea3i \u0111\u01b0\u1ee3c thay th\u1ebf ngay l\u1eadp t\u1ee9c. M\u1ed9t GFCI \u0111\u00e3 \u0111\u1ea1t \u0111\u1ebfn cu\u1ed1i v\u00f2ng \u0111\u1eddi ph\u1ee5c v\u1ee5 c\u1ee7a n\u00f3 \u2014 th\u01b0\u1eddng sau 10-15 n\u0103m ph\u1ee5c v\u1ee5, m\u1eb7c d\u00f9 n\u00f3 c\u00f3 th\u1ec3 h\u1ecfng s\u1edbm h\u01a1n trong \u0111i\u1ec1u ki\u1ec7n \u1ea9m \u01b0\u1edbt ho\u1eb7c b\u00ean ngo\u00e0i n\u01a1i \u0111\u1ed9 \u1ea9m r\u1ea5t cao \u2014 c\u1ea7n \u0111\u01b0\u1ee3c thay th\u1ebf m\u1ed9t c\u00e1ch ch\u1ee7 \u0111\u1ed9ng thay v\u00ec ph\u1ea3n \u1ee9ng v\u00ec kh\u00f4ng c\u00f3 c\u00e1ch n\u00e0o \u0111\u1ec3 bi\u1ebft r\u1eb1ng GFCI \u0111\u00e3 ng\u1eebng ho\u1ea1t \u0111\u1ed9ng.<\/p>\n

\"\u0110i\u1ec1u<\/p>\n

Nh\u1eefng g\u00ec kh\u00f4ng n\u00ean c\u1eafm v\u00e0o GFCI<\/h2>\n

Vi\u1ec7c s\u1eed d\u1ee5ng b\u1ea3o v\u1ec7 GFCI l\u00e0 r\u1ea5t quan tr\u1ecdng khi x\u1eed l\u00fd c\u00e1c khu v\u1ef1c \u1ea9m \u01b0\u1edbt, nh\u01b0ng m\u1ed9t s\u1ed1 thi\u1ebft b\u1ecb th\u1ef1c s\u1ef1 ch\u1ee9ng t\u1ecf l\u00e0 l\u1ef1a ch\u1ecdn k\u00e9m v\u00e0 c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn vi\u1ec7c ng\u1eaft \u0111i\u1ec7n kh\u00f4ng mong mu\u1ed1n. Trong kh\u00eda c\u1ea1nh n\u00e0y, t\u1ee7 l\u1ea1nh v\u00e0 t\u1ee7 \u0111\u00f4ng (\u0111\u1eb7c bi\u1ec7t l\u00e0 c\u00e1c thi\u1ebft b\u1ecb c\u0169) c\u00f3 th\u1ec3 t\u1ea1o ra d\u00f2ng r\u00f2 nh\u1ecf theo th\u1eddi gian trong khi m\u00e1y n\u00e9n v\u1eabn ho\u1ea1t \u0111\u1ed9ng t\u1ed1t. C\u1ea7n ph\u1ea3i \u0111\u1ec1 c\u1eadp r\u1eb1ng m\u1ed9t GFCI ng\u1eaft \u0111i\u1ec7n tr\u00ean m\u1ed9t t\u1ee7 \u0111\u00f4ng \u0111ang ho\u1ea1t \u0111\u1ed9ng \u1edf gara v\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c ch\u00fa \u00fd trong v\u00e0i ng\u00e0y s\u1ebd d\u1eabn \u0111\u1ebfn th\u1ef1c ph\u1ea9m b\u1ecb h\u1ecfng. C\u1ea7n ph\u1ea3i \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u00e1c thi\u1ebft b\u1ecb nh\u01b0 m\u00e1y b\u01a1m n\u01b0\u1edbc th\u1ea3i v\u00e0 m\u00e1y b\u01a1m n\u01b0\u1edbc th\u1ea3i: m\u1ed9t GFCI \u0111\u00e3 ng\u1eaft \u0111i\u1ec7n trong m\u1ed9t c\u01a1n b\u00e3o s\u1ebd g\u00e2y ng\u1eadp n\u01b0\u1edbc trong t\u1ea7ng h\u1ea7m. Li\u00ean quan \u0111\u1ebfn nh\u1eefng thi\u1ebft b\u1ecb n\u00e0y, NEC cho ph\u00e9p m\u1ed9t \u1ed5 c\u1eafm \u1ea9m duy nh\u1ea5t kh\u00f4ng c\u00f3 b\u1ea3o v\u1ec7 GFCI trong m\u1ed9t s\u1ed1 \u0111i\u1ec1u ki\u1ec7n nh\u1ea5t \u0111\u1ecbnh n\u1ebfu v\u1ecb tr\u00ed l\u1eafp \u0111\u1eb7t kh\u00f4ng y\u00eau c\u1ea7u b\u1ea3o v\u1ec7 kh\u00e1c. N\u1ebfu, ng\u01b0\u1ee3c l\u1ea1i, nhu c\u1ea7u v\u1ec1 GFCI l\u00e0 r\u00f5 r\u00e0ng (gara ho\u1eb7c t\u1ea7ng h\u1ea7m ch\u01b0a ho\u00e0n thi\u1ec7n), l\u1ef1a ch\u1ecdn l\u00e0 s\u1eed d\u1ee5ng GFCI v\u1edbi chu\u00f4ng b\u00e1o \u0111\u1ed9ng \u00e2m thanh s\u1ebd th\u00f4ng b\u00e1o cho ch\u1ee7 nh\u00e0 ho\u1eb7c l\u1eafp \u0111\u1eb7t m\u1ed9t GFCI chuy\u00ean d\u1ee5ng duy nh\u1ea5t ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng cho thi\u1ebft b\u1ecb \u0111\u00f3, v\u00ec v\u1eady n\u1ebfu n\u00f3 ng\u1eaft, n\u00f3 s\u1ebd kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn b\u1ea5t k\u1ef3 t\u1ea3i n\u00e0o kh\u00e1c tr\u00ean m\u1ea1ch \u0111\u00f3. \u0110\u00e2y l\u00e0 l\u00fd do kh\u00f4ng n\u00ean tr\u00e1nh b\u1ea3o v\u1ec7 GFCI b\u1ea5t c\u1ee9 khi n\u00e0o c\u1ea7n thi\u1ebft, m\u00e0 thay v\u00e0o \u0111\u00f3 l\u00e0 \u00e1p d\u1ee5ng n\u00f3 m\u1ed9t c\u00e1ch kh\u00f4n ngoan.<\/p>\n

Gi\u1ea3i ph\u00e1p k\u1ebft h\u1ee3p: C\u1ea7u dao ch\u1ee9c n\u0103ng k\u00e9p AFCI\/GFCI v\u00e0 RCBO<\/h2>\n

C\u00e1c y\u00eau c\u1ea7u ng\u00e0y c\u00e0ng t\u0103ng c\u1ee7a NEC v\u1ec1 b\u1ea3o v\u1ec7 AFCI v\u00e0 GFCI \u0111\u00e3 d\u1eabn \u0111\u1ebfn vi\u1ec7c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i c\u00e1c c\u1ea7u dao ch\u1ee9c n\u0103ng k\u00e9p, l\u00e0 nh\u1eefng thi\u1ebft b\u1ecb cung c\u1ea5p b\u1ea3o v\u1ec7 AFCI, GFCI v\u00e0 qu\u00e1 d\u00f2ng trong m\u1ed9t g\u00f3i duy nh\u1ea5t. Trong th\u1ebf gi\u1edbi IEC, RCBO l\u00e0 nh\u1eefng thi\u1ebft b\u1ecb th\u1ef1c hi\u1ec7n c\u00f9ng lo\u1ea1i b\u1ea3o v\u1ec7 t\u00edch l\u0169y n\u00e0y b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u1ed9t thi\u1ebft b\u1ecb DIN-rail duy nh\u1ea5t, k\u1ebft h\u1ee3p ch\u1ee9c n\u0103ng b\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng (MCB) v\u00e0 b\u1ea3o v\u1ec7 d\u00f2ng r\u00f2 (RCD). C\u00e1c m\u1ea1ch cung c\u1ea5p \u1ed5 c\u1eafm m\u1eb7t b\u00e0n b\u1ebfp trong m\u1ed9t ng\u00f4i nh\u00e0 m\u1edbi \u1edf B\u1eafc M\u1ef9 th\u01b0\u1eddng y\u00eau c\u1ea7u c\u1ea3 b\u1ea3o v\u1ec7 AFCI v\u00e0 GFCI, v\u00e0 b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n s\u1ebd \u0111\u01b0\u1ee3c trang b\u1ecb m\u1ed9t c\u1ea7u dao ch\u1ee9c n\u0103ng k\u00e9p k\u1ebft h\u1ee3p AFCI, GFCI v\u00e0 b\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng th\u00f4ng th\u01b0\u1eddng trong m\u1ed9t \u0111\u01a1n v\u1ecb duy nh\u1ea5t. \u1ede V\u01b0\u01a1ng qu\u1ed1c Anh\/c\u00e1c khu v\u1ef1c s\u1ea3n ph\u1ea9m t\u01b0\u01a1ng t\u1ef1, m\u1ed7i m\u1ea1ch cu\u1ed1i c\u00f9ng s\u1ebd \u0111\u01b0\u1ee3c trang b\u1ecb m\u1ed9t RCBO \u0111\u1ea1t \u0111\u01b0\u1ee3c c\u00f9ng m\u1ee9c \u0111\u1ed9 b\u1ea3o v\u1ec7. HUYU s\u1ea3n xu\u1ea5t v\u00e0 cung c\u1ea5p c\u00e1c thi\u1ebft b\u1ecb ch\u1ee9c n\u0103ng k\u00e9p v\u00e0 RCBO cho c\u1ea3 \u1ee9ng d\u1ee5ng AC v\u00e0 DC, bao g\u1ed3m <\/span>RCBO lo\u1ea1i B VRL22B c\u1ee7a HUYU<\/a>, cung c\u1ea5p b\u1ea3o v\u1ec7 d\u00f2ng r\u00f2 cho c\u00e1c m\u1ea1ch n\u01a1i c\u00f3 th\u1ec3 c\u00f3 r\u00f2 r\u1ec9 DC \u2014 ch\u1eb3ng h\u1ea1n nh\u01b0 nh\u1eefng m\u1ea1ch ph\u1ee5c v\u1ee5 cho b\u1ed9 s\u1ea1c EV, b\u1ed9 bi\u1ebfn t\u1ea7n n\u0103ng l\u01b0\u1ee3ng m\u1eb7t tr\u1eddi ho\u1eb7c b\u1ed9 \u0111i\u1ec1u khi\u1ec3n t\u1ed1c \u0111\u1ed9 bi\u1ebfn thi\u00ean.<\/span><\/p>\n

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

S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa m\u1ed9t b\u1ed9 ng\u1eaft m\u1ea1ch d\u00f2ng r\u00f2 v\u00e0 m\u1ed9t b\u1ed9 ng\u1eaft m\u1ea1ch l\u00e0 g\u00ec?<\/h3>\n

M\u1ed9t b\u1ed9 ng\u1eaft m\u1ea1ch b\u1ea3o v\u1ec7 m\u1ea1ch kh\u1ecfi c\u1ea3 qu\u00e1 t\u1ea3i v\u00e0 ng\u1eafn m\u1ea1ch b\u1eb1ng c\u00e1ch ng\u0103n ch\u1eb7n s\u1ef1 qu\u00e1 nhi\u1ec7t c\u1ee7a d\u00e2y v\u00e0 nguy c\u01a1 ch\u00e1y n\u1ed5. Tuy nhi\u00ean, m\u1ed9t GFCI cung c\u1ea5p b\u1ea3o v\u1ec7 ch\u1ed1ng l\u1ea1i c\u00e1c l\u1ed7i d\u00f2ng \u0111\u1ea5t, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 c\u1ee9u ng\u01b0\u1eddi kh\u1ecfi b\u1ecb \u0111i\u1ec7n gi\u1eadt do d\u00f2ng \u0111i\u1ec7n r\u00f2 v\u00e0o \u0111\u1ea5t. Ch\u00fang cung c\u1ea5p b\u1ea3o v\u1ec7 ch\u1ed1ng l\u1ea1i c\u00e1c m\u1ed1i nguy hi\u1ec3m kh\u00e1c nhau nh\u01b0ng c\u1ea3 hai \u0111\u1ec1u c\u1ea7n thi\u1ebft trong c\u00e1c m\u1ea1ch n\u1eb1m \u1edf c\u00e1c v\u1ecb tr\u00ed \u1ea9m \u01b0\u1edbt ho\u1eb7c ngo\u00e0i tr\u1eddi.<\/p>\n

B\u1ea1n kh\u00f4ng n\u00ean c\u1eafm g\u00ec v\u00e0o m\u1ed9t GFCI?<\/h3>\n

T\u1ee7 \u0111\u00f4ng, t\u1ee7 l\u1ea1nh, m\u00e1y b\u01a1m x\u1ea3 n\u01b0\u1edbc th\u1ea3i v\u00e0 m\u00e1y b\u01a1m h\u1ed1 ga c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn vi\u1ec7c GFCI b\u1ecb k\u00edch ho\u1ea1t kh\u00f4ng mong mu\u1ed1n, g\u00e2y h\u01b0 h\u1ecfng th\u1ef1c ph\u1ea9m v\u00e0 ng\u1eadp l\u1ee5t n\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n k\u1ecbp th\u1eddi. N\u1ebfu c\u1ea7n b\u1ea3o v\u1ec7 GFCI, c\u1ea7n ph\u1ea3i l\u1eafp \u0111\u1eb7t m\u1ed9t ngu\u1ed3n \u0111i\u1ec7n \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t cho GFCI c\u00f3 c\u00f2i b\u00e1o \u0111\u1ed9ng ho\u1eb7c m\u1ed9t GFCI \u0111\u01b0\u1ee3c g\u1eafn tr\u00ean m\u1ed9t \u1ed5 c\u1eafm \u0111\u01a1n ch\u1ec9 cung c\u1ea5p \u0111i\u1ec7n cho thi\u1ebft b\u1ecb \u0111\u00f3.<\/p>\n

GFCI s\u1ebd l\u00e0m g\u00ec khi n\u00f3 h\u1ecfng?<\/h3>\n

N\u1ebfu m\u1ed9t GFCI kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng nh\u01b0 mong \u0111\u1ee3i, n\u00f3 s\u1ebd ho\u1eb7c ng\u1eaft m\u1ea1ch kh\u00f4ng c\u1ea7n thi\u1ebft ho\u1eb7c kh\u00f4ng ng\u1eaft khi nh\u1ea5n n\u00fat TEST. N\u00fat TEST ph\u1ea3i \u0111\u01b0\u1ee3c nh\u1ea5n m\u1ed7i th\u00e1ng, v\u00e0 n\u1ebfu GFCI kh\u00f4ng ng\u1eaft, n\u00f3 ph\u1ea3i \u0111\u01b0\u1ee3c thay th\u1ebf ngay l\u1eadp t\u1ee9c.<\/p>\n

C\u00f3 b\u1ed9 ng\u1eaft m\u1ea1ch n\u00e0o v\u1eeba l\u00e0 AFCI v\u1eeba l\u00e0 GFCI kh\u00f4ng?<\/h3>\n

Th\u1eadt v\u1eady, b\u1ed9 ng\u1eaft m\u1ea1ch ch\u1ee9c n\u0103ng k\u00e9p l\u00e0 c\u00e1c thi\u1ebft b\u1ecb t\u00edch h\u1ee3p h\u00e0i h\u00f2a b\u1ea3o v\u1ec7 ch\u1ed1ng h\u1ed3 quang (AFCI), ch\u1ed1ng r\u00f2 \u0111\u1ea5t (GFCI), v\u00e0 c\u00e1c ph\u01b0\u01a1ng ph\u00e1p b\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng th\u00f4ng th\u01b0\u1eddng. C\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t b\u1ea3ng \u0111i\u1ec7n kh\u00e1c nhau \u1edf B\u1eafc M\u1ef9 s\u1ea3n xu\u1ea5t c\u00e1c thi\u1ebft b\u1ecb n\u00e0y v\u00e0 ch\u00fang cung c\u1ea5p s\u1ef1 b\u1ea3o v\u1ec7 t\u1ed1i \u01b0u cho m\u1ed9t m\u1ea1ch \u0111i\u1ec7n \u0111\u01a1n l\u1ebb.<\/p>\n

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