{"id":4274,"date":"2026-09-30T00:00:00","date_gmt":"2026-09-30T00:00:00","guid":{"rendered":"https:\/\/chac-electric.com\/?p=4274"},"modified":"2026-09-18T08:08:52","modified_gmt":"2026-09-18T08:08:52","slug":"huong-dan-quy-mo-day-dien-va-lua-chon-cau-dao-240v","status":"publish","type":"post","link":"https:\/\/chac-electric.com\/vi\/blog\/240v-circuit-breaker-sizing-wiring-and-selection-guide\/","title":{"rendered":"B\u1ed9 ng\u1eaft m\u1ea1ch 240V: H\u01b0\u1edbng d\u1eabn v\u1ec1 quy c\u00e1ch, h\u1ec7 th\u1ed1ng d\u00e2y v\u00e0 l\u1ef1a ch\u1ecdn"},"content":{"rendered":"

Khi m\u1ed9t vai tr\u00f2 d\u1ef1 \u00e1n g\u1eb7p v\u1ea5n \u0111\u1ec1 l\u1ef1a ch\u1ecdn, s\u1ef1 th\u1ea5t b\u1ea1i hi\u1ec3n nhi\u00ean th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n tr\u01b0\u1edbc khi nguy\u00ean nh\u00e2n th\u1ef1c s\u1ef1 \u0111\u01b0\u1ee3c hi\u1ec3u r\u00f5. Liam, m\u1ed9t k\u1ef9 s\u01b0 d\u1ef1 \u00e1n t\u1ea1i Brisbane, \u0111\u00e3 ch\u1ecdn m\u1ed9t b\u1ed9 ng\u1eaft \u0111i\u1ec7n 240 V b\u1eb1ng c\u00e1ch chia \u0111i\u1ec7n tr\u1edf tr\u00ean nh\u00e3n v\u1edbi 240 v\u00e0 d\u1eebng l\u1ea1i \u1edf \u0111\u00f3. \u0110\u01b0\u1eddng d\u1eabn c\u00e1p, \u0111\u1ed9 t\u1ea3i li\u00ean t\u1ee5c v\u00e0 m\u1ee9c \u0111\u1ed9 l\u1ed7i kh\u00f4ng c\u00f3 trong b\u1ea3ng d\u1ef1 to\u00e1n. M\u1ed9t cu\u1ed9c \u0111\u00e1nh gi\u00e1 quy m\u00f4 to\u00e0n di\u1ec7n \u0111\u00e3 ph\u00e1t hi\u1ec7n ra nh\u1eefng r\u00e0ng bu\u1ed9c c\u00f2n thi\u1ebfu tr\u01b0\u1edbc khi ti\u1ebfn h\u00e0nh l\u1eafp \u0111\u1eb7t.<\/p>\n

T\u00f3m t\u1eaft:<\/strong> M\u1ed9t b\u1ed9 ng\u1eaft m\u1ea1ch 240 V \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn d\u1ef1a tr\u00ean d\u00f2ng t\u1ea3i, c\u00f4ng su\u1ea5t d\u00e2y d\u1eabn, b\u1ed1 tr\u00ed c\u1ef1c, d\u00f2ng \u0111i\u1ec7n qu\u00e1 t\u1ea3i, \u0111\u01b0\u1eddng cong ng\u1eaft v\u00e0 quy t\u1eafc h\u1ec7 th\u1ed1ng d\u00e2y \u0111\u1ecba ph\u01b0\u01a1ng. \u0110\u1ed1i v\u1edbi t\u1ea3i 4,8 kW, d\u00f2ng \u0111i\u1ec7n minh h\u1ecda l\u00e0 20 A \u1edf h\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t \u0111\u01a1n, nh\u01b0ng qu\u00e1 tr\u00ecnh t\u00ednh to\u00e1n n\u00e0y kh\u00f4ng t\u1ef1 \u0111\u1ed9ng thi\u1ebft l\u1eadp b\u1ed9 ng\u1eaft m\u1ea1ch. Ki\u1ec3m tra d\u00f2ng kh\u1edfi \u0111\u1ed9ng, t\u00ednh n\u0103ng t\u1ea3i li\u00ean t\u1ee5c v\u00e0 gi\u1edbi h\u1ea1n h\u1ec7 th\u1ed1ng d\u00e2y c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t. B\u00e0i vi\u1ebft n\u00e0y \u0111\u1ea3m b\u1ea3o t\u00ednh minh b\u1ea1ch trong vi\u1ec7c \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh v\u00e0 t\u00e1ch bi\u1ec7t kh\u1ea3 n\u0103ng c\u1ee7a s\u1ea3n ph\u1ea9m v\u1edbi tr\u00e1ch nhi\u1ec7m l\u1eafp \u0111\u1eb7t.<\/p>\n

\"H\u01b0\u1edbng<\/p>\n

L\u1ef1a ch\u1ecdn k\u00edch th\u01b0\u1edbc v\u00e0 tr\u00ecnh t\u1ef1 k\u1ebft n\u1ed1i<\/h2>\n

C\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang b\u1eaft \u0111\u1ea7u t\u1eeb ranh gi\u1edbi \u1ee9ng d\u1ee5ng. H\u00e3y x\u00e1c \u0111\u1ecbnh ngu\u1ed3n, t\u1ea3i, d\u00e2y d\u1eabn, m\u1ee9c \u0111\u1ed9 s\u1ef1 c\u1ed1 v\u00e0 m\u00f4i tr\u01b0\u1eddng v\u1eadn h\u00e0nh tr\u01b0\u1edbc khi so s\u00e1nh c\u00e1c catalogue. M\u1ed9t thi\u1ebft b\u1ecb tr\u00f4ng c\u00f3 v\u1ebb ph\u00f9 h\u1ee3p v\u1ec1 \u0111\u1ecbnh m\u1ee9c d\u00f2ng \u0111i\u1ec7n v\u1eabn c\u00f3 th\u1ec3 h\u1ecfng v\u1ec1 kh\u1ea3 n\u0103ng ch\u1ecbu h\u1ed3 quang, t\u00ednh ch\u1ecdn l\u1ecdc, nhi\u1ec7t \u0111\u1ed9 ho\u1eb7c ph\u01b0\u01a1ng ph\u00e1p l\u1eafp \u0111\u1eb7t. H\u00e3y s\u1eed d\u1ee5ng \u0111\u01b0\u1eddng cong th\u1eddi gian-d\u00f2ng \u0111i\u1ec7n c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t v\u00e0 ti\u00eau chu\u1ea9n \u0111i d\u00e2y \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng l\u00e0m ng\u00f4n ng\u1eef chung gi\u1eefa thi\u1ebft k\u1ebf, mua s\u1eafm v\u00e0 ch\u1ea1y th\u1eed.<\/p>\n

L\u1eadp t\u00e0i li\u1ec7u v\u1ec1 c\u00e1c gi\u1ea3 \u0111\u1ecbnh v\u00e0 ki\u1ec3m tra ch\u00fang t\u1ea1i t\u1ee7 \u0111i\u1ec7n. V\u00ed d\u1ee5, m\u1ed9t nghi\u00ean c\u1ee9u v\u1ec1 b\u1ea3o v\u1ec7 c\u1ea7n n\u00eau r\u00f5 d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch d\u1ef1 ki\u1ebfn, d\u00f2ng \u0111i\u1ec7n kh\u1edfi \u0111\u1ed9ng (inrush) d\u1ef1 ki\u1ebfn, kh\u1ea3 n\u0103ng mang d\u00f2ng c\u1ee7a d\u00e2y d\u1eabn v\u00e0 th\u1eddi gian c\u1eaft y\u00eau c\u1ea7u. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p c\u00f3 t\u00ean g\u1ecdi c\u1ee5 th\u1ec3 nh\u01b0 th\u1eed nghi\u1ec7m ti\u00eam d\u00f2ng s\u01a1 c\u1ea5p, th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n ho\u1eb7c nghi\u00ean c\u1ee9u ph\u1ed1i h\u1ee3p s\u1ebd h\u1eefu \u00edch h\u01a1n so v\u1edbi m\u1ed9t tuy\u00ean b\u1ed1 chung chung r\u1eb1ng m\u1ed9t s\u1ea3n ph\u1ea9m \u0111\u1ea1t \u201cc\u1ea5p \u0111\u1ed9 c\u00f4ng nghi\u1ec7p.\u201d<\/p>\n

N\u1ebfu c\u00e2u tr\u1ea3 l\u1eddi thay \u0111\u1ed5i theo th\u1ecb tr\u01b0\u1eddng \u0111\u00edch, h\u1ec7 th\u1ed1ng \u0111i\u1ec7n \u00e1p ho\u1eb7c lo\u1ea1i \u1ee9ng d\u1ee5ng, h\u00e3y n\u00eau gi\u1ea3 \u0111\u1ecbnh \u0111\u00f3 trong th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u00e0 nh\u1eadn \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn b\u1eb1ng v\u0103n b\u1ea3n tr\u01b0\u1edbc khi ph\u00e1t h\u00e0nh.<\/p>\n

20 c\u00e2u h\u1ecfi \u1edf m\u1ee9c 240 V<\/h2>\n

C\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang b\u1eaft \u0111\u1ea7u t\u1eeb ranh gi\u1edbi \u1ee9ng d\u1ee5ng. H\u00e3y x\u00e1c \u0111\u1ecbnh ngu\u1ed3n, t\u1ea3i, d\u00e2y d\u1eabn, m\u1ee9c \u0111\u1ed9 s\u1ef1 c\u1ed1 v\u00e0 m\u00f4i tr\u01b0\u1eddng v\u1eadn h\u00e0nh tr\u01b0\u1edbc khi so s\u00e1nh c\u00e1c catalogue. M\u1ed9t thi\u1ebft b\u1ecb tr\u00f4ng c\u00f3 v\u1ebb ph\u00f9 h\u1ee3p v\u1ec1 \u0111\u1ecbnh m\u1ee9c d\u00f2ng \u0111i\u1ec7n v\u1eabn c\u00f3 th\u1ec3 h\u1ecfng v\u1ec1 kh\u1ea3 n\u0103ng ch\u1ecbu h\u1ed3 quang, t\u00ednh ch\u1ecdn l\u1ecdc, nhi\u1ec7t \u0111\u1ed9 ho\u1eb7c ph\u01b0\u01a1ng ph\u00e1p l\u1eafp \u0111\u1eb7t. H\u00e3y s\u1eed d\u1ee5ng \u0111\u01b0\u1eddng cong th\u1eddi gian-d\u00f2ng \u0111i\u1ec7n c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t v\u00e0 ti\u00eau chu\u1ea9n \u0111i d\u00e2y \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng l\u00e0m ng\u00f4n ng\u1eef chung gi\u1eefa thi\u1ebft k\u1ebf, mua s\u1eafm v\u00e0 ch\u1ea1y th\u1eed.<\/p>\n

L\u1eadp t\u00e0i li\u1ec7u v\u1ec1 c\u00e1c gi\u1ea3 \u0111\u1ecbnh v\u00e0 ki\u1ec3m tra ch\u00fang t\u1ea1i t\u1ee7 \u0111i\u1ec7n. V\u00ed d\u1ee5, m\u1ed9t nghi\u00ean c\u1ee9u v\u1ec1 b\u1ea3o v\u1ec7 c\u1ea7n n\u00eau r\u00f5 d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch d\u1ef1 ki\u1ebfn, d\u00f2ng \u0111i\u1ec7n kh\u1edfi \u0111\u1ed9ng (inrush) d\u1ef1 ki\u1ebfn, kh\u1ea3 n\u0103ng mang d\u00f2ng c\u1ee7a d\u00e2y d\u1eabn v\u00e0 th\u1eddi gian c\u1eaft y\u00eau c\u1ea7u. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p c\u00f3 t\u00ean g\u1ecdi c\u1ee5 th\u1ec3 nh\u01b0 th\u1eed nghi\u1ec7m ti\u00eam d\u00f2ng s\u01a1 c\u1ea5p, th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n ho\u1eb7c nghi\u00ean c\u1ee9u ph\u1ed1i h\u1ee3p s\u1ebd h\u1eefu \u00edch h\u01a1n so v\u1edbi m\u1ed9t tuy\u00ean b\u1ed1 chung chung r\u1eb1ng m\u1ed9t s\u1ea3n ph\u1ea9m \u0111\u1ea1t \u201cc\u1ea5p \u0111\u1ed9 c\u00f4ng nghi\u1ec7p.\u201d<\/p>\n

N\u1ebfu c\u00e2u tr\u1ea3 l\u1eddi thay \u0111\u1ed5i theo th\u1ecb tr\u01b0\u1eddng \u0111\u00edch, h\u1ec7 th\u1ed1ng \u0111i\u1ec7n \u00e1p ho\u1eb7c lo\u1ea1i \u1ee9ng d\u1ee5ng, h\u00e3y n\u00eau gi\u1ea3 \u0111\u1ecbnh \u0111\u00f3 trong th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u00e0 nh\u1eadn \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn b\u1eb1ng v\u0103n b\u1ea3n tr\u01b0\u1edbc khi ph\u00e1t h\u00e0nh.<\/p>\n

An to\u00e0n trong qu\u00e1 tr\u00ecnh th\u1eed nghi\u1ec7m v\u00e0 l\u1eafp \u0111\u1eb7t<\/h2>\n

C\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang b\u1eaft \u0111\u1ea7u t\u1eeb ranh gi\u1edbi \u1ee9ng d\u1ee5ng. H\u00e3y x\u00e1c \u0111\u1ecbnh ngu\u1ed3n, t\u1ea3i, d\u00e2y d\u1eabn, m\u1ee9c \u0111\u1ed9 s\u1ef1 c\u1ed1 v\u00e0 m\u00f4i tr\u01b0\u1eddng v\u1eadn h\u00e0nh tr\u01b0\u1edbc khi so s\u00e1nh c\u00e1c catalogue. M\u1ed9t thi\u1ebft b\u1ecb tr\u00f4ng c\u00f3 v\u1ebb ph\u00f9 h\u1ee3p v\u1ec1 \u0111\u1ecbnh m\u1ee9c d\u00f2ng \u0111i\u1ec7n v\u1eabn c\u00f3 th\u1ec3 h\u1ecfng v\u1ec1 kh\u1ea3 n\u0103ng ch\u1ecbu h\u1ed3 quang, t\u00ednh ch\u1ecdn l\u1ecdc, nhi\u1ec7t \u0111\u1ed9 ho\u1eb7c ph\u01b0\u01a1ng ph\u00e1p l\u1eafp \u0111\u1eb7t. H\u00e3y s\u1eed d\u1ee5ng \u0111\u01b0\u1eddng cong th\u1eddi gian-d\u00f2ng \u0111i\u1ec7n c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t v\u00e0 ti\u00eau chu\u1ea9n \u0111i d\u00e2y \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng l\u00e0m ng\u00f4n ng\u1eef chung gi\u1eefa thi\u1ebft k\u1ebf, mua s\u1eafm v\u00e0 ch\u1ea1y th\u1eed.<\/p>\n

L\u1eadp t\u00e0i li\u1ec7u v\u1ec1 c\u00e1c gi\u1ea3 \u0111\u1ecbnh v\u00e0 ki\u1ec3m tra ch\u00fang t\u1ea1i t\u1ee7 \u0111i\u1ec7n. V\u00ed d\u1ee5, m\u1ed9t nghi\u00ean c\u1ee9u v\u1ec1 b\u1ea3o v\u1ec7 c\u1ea7n n\u00eau r\u00f5 d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch d\u1ef1 ki\u1ebfn, d\u00f2ng \u0111i\u1ec7n kh\u1edfi \u0111\u1ed9ng (inrush) d\u1ef1 ki\u1ebfn, kh\u1ea3 n\u0103ng mang d\u00f2ng c\u1ee7a d\u00e2y d\u1eabn v\u00e0 th\u1eddi gian c\u1eaft y\u00eau c\u1ea7u. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p c\u00f3 t\u00ean g\u1ecdi c\u1ee5 th\u1ec3 nh\u01b0 th\u1eed nghi\u1ec7m ti\u00eam d\u00f2ng s\u01a1 c\u1ea5p, th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n ho\u1eb7c nghi\u00ean c\u1ee9u ph\u1ed1i h\u1ee3p s\u1ebd h\u1eefu \u00edch h\u01a1n so v\u1edbi m\u1ed9t tuy\u00ean b\u1ed1 chung chung r\u1eb1ng m\u1ed9t s\u1ea3n ph\u1ea9m \u0111\u1ea1t \u201cc\u1ea5p \u0111\u1ed9 c\u00f4ng nghi\u1ec7p.\u201d<\/p>\n

N\u1ebfu c\u00e2u tr\u1ea3 l\u1eddi thay \u0111\u1ed5i theo th\u1ecb tr\u01b0\u1eddng \u0111\u00edch, h\u1ec7 th\u1ed1ng \u0111i\u1ec7n \u00e1p ho\u1eb7c lo\u1ea1i \u1ee9ng d\u1ee5ng, h\u00e3y n\u00eau gi\u1ea3 \u0111\u1ecbnh \u0111\u00f3 trong th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u00e0 nh\u1eadn \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn b\u1eb1ng v\u0103n b\u1ea3n tr\u01b0\u1edbc khi ph\u00e1t h\u00e0nh.<\/p>\n

\"H\u01b0\u1edbng<\/p>\n

So s\u00e1nh cho m\u1ed9t th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u00f3 t\u00ednh b\u1ea3o v\u1ec7<\/h2>\n\n\n\n\n\n\n\n
K\u00edch th\u01b0\u1edbc<\/th>\nL\u1ef1a ch\u1ecdn A<\/th>\nPh\u01b0\u01a1ng \u00e1n B<\/th>\n<\/tr>\n<\/thead>\n
\u0110\u1ecbnh m\u1ee9c t\u1ea3i \u0111i\u1ec7n<\/td>\nC\u00f4ng su\u1ea5t, h\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t v\u00e0 c\u00f4ng su\u1ea5t t\u1ea3i<\/td>\nThi\u1ebft k\u1ebf hi\u1ec7n t\u1ea1i<\/td>\n<\/tr>\n
Ng\u01b0\u1eddi \u0111i\u1ec1u khi\u1ec3n<\/td>\nAmpacity, gi\u1ea3m c\u1ea5p v\u00e0 tuy\u1ebfn \u0111\u01b0\u1eddng<\/td>\nK\u00edch th\u01b0\u1edbc c\u00e1p \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7<\/td>\n<\/tr>\n
Breaker<\/td>\nC\u00f4ng vi\u1ec7c c\u1ee7a ng\u01b0\u1eddi Ba Lan, \u0111\u01b0\u1eddng cong v\u00e0 l\u1ed7i<\/td>\nL\u1ef1a ch\u1ecdn thi\u1ebft b\u1ecb ph\u00f9 h\u1ee3p<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

C\u00e1c ho\u1ea1t \u0111\u1ed9ng l\u1ef1a ch\u1ecdn v\u00e0 mua s\u1eafm<\/h2>\n
    \n
  1. \u0110\u00f3ng b\u0103ng c\u00e1c gi\u1ea3 \u0111\u1ecbnh v\u1ec1 \u0111i\u1ec7n: \u0111i\u1ec7n \u00e1p h\u1ec7 th\u1ed1ng, s\u1ed1 c\u1ef1c, d\u00f2ng t\u1ea3i, ph\u01b0\u01a1ng ph\u00e1p d\u1eabn \u0111i\u1ec7n, d\u00f2ng s\u1ef1 c\u1ed1 v\u00e0 gi\u1edbi h\u1ea1n nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng.<\/li>\n
  2. Y\u00eau c\u1ea7u d\u1eef li\u1ec7u theo d\u00f2ng s\u1ea3n ph\u1ea9m: phi\u00ean b\u1ea3n ti\u00eau chu\u1ea9n, \u0111\u01b0\u1eddng \u0111\u1eb7c t\u00ednh d\u00f2ng c\u1eaft, kh\u1ea3 n\u0103ng ng\u1eaft, gi\u1edbi h\u1ea1n c\u1ef1c \u0111\u1ea5u d\u00e2y, k\u00edch th\u01b0\u1edbc v\u00e0 b\u1eb1ng ch\u1ee9ng th\u1eed nghi\u1ec7m.<\/li>\n
  3. Xem x\u00e9t vi\u1ec7c ph\u1ed1i h\u1ee3p v\u1edbi c\u00e1c thi\u1ebft b\u1ecb th\u01b0\u1ee3ng ngu\u1ed3n v\u00e0 h\u1ea1 ngu\u1ed3n; kh\u00f4ng suy lu\u1eadn t\u00ednh ch\u1ecdn l\u1ecdc t\u1eeb nh\u00e3n hi\u1ec7u ho\u1eb7c k\u00edch th\u01b0\u1edbc khung.<\/li>\n
  4. Ph\u00ea duy\u1ec7t m\u1eabu ho\u1eb7c b\u00e0i vi\u1ebft \u0111\u1ea7u ti\u00ean, ghi l\u1ea1i l\u1ef1c si\u1ebft v\u00e0 c\u00e1c \u0111i\u1ec3m ki\u1ec3m tra, \u0111\u1ed3ng th\u1eddi x\u00e1c \u0111\u1ecbnh ai l\u00e0 ng\u01b0\u1eddi th\u1ef1c hi\u1ec7n c\u00e1c b\u00e0i ki\u1ec3m tra ch\u1ea1y th\u1eed.<\/li>\n
  5. L\u1eadp k\u1ebf ho\u1ea1ch ph\u1ee5 t\u00f9ng v\u00e0 qu\u1ea3n l\u00fd thay \u0111\u1ed5i \u0111\u1ec3 vi\u1ec7c thay th\u1ebf sau n\u00e0y kh\u00f4ng l\u00e0m thay \u0111\u1ed5i \u00e2m th\u1ea7m hi\u1ec7u su\u1ea5t an to\u00e0n.<\/li>\n<\/ol>\n

    \u0110\u1ed1i v\u1edbi nh\u1eefng ng\u01b0\u1eddi mua \u0111ang so s\u00e1nh c\u00e1c d\u00f2ng s\u1ea3n ph\u1ea9m b\u1ea3o v\u1ec7 c\u00f3 th\u1ec3 c\u1ea5u h\u00ecnh, CHAC Electric cung c\u1ea5p th\u00f4ng tin c\u00f4ng khai v\u1ec1 B\u1ed9 ng\u1eaft m\u1ea1ch DC<\/strong><\/a> v\u00e0 thi\u1ebft b\u1ecb ph\u00e2n ph\u1ed1i \u0111i\u1ec7n<\/strong><\/a>. H\u00e3y coi c\u00e1c trang n\u00e0y l\u00e0 \u0111i\u1ec3m kh\u1edfi \u0111\u1ea7u v\u00e0 x\u00e1c nh\u1eadn d\u1eef li\u1ec7u m\u00f4 h\u00ecnh ch\u00ednh x\u00e1c cho d\u1ef1 \u00e1n c\u1ee7a b\u1ea1n.<\/p>\n

    <\/p>\n

    C\u1eaft \u0111i\u1ec7n h\u1ec7 th\u1ed1ng 240V ri\u00eang bi\u1ec7t v\u1edbi c\u1ea5p \u0111i\u1ec7n c\u1ee7a ph\u00edch c\u1eafm<\/h2>\n

    A B\u1ed9 ng\u1eaft m\u1ea1ch 240V<\/strong><\/a> l\u00e0 \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn t\u1eeb s\u1ef1 s\u1eafp x\u1ebfp v\u1ec1 ngu\u1ed3n cung c\u1ea5p th\u1ef1c t\u1ebf, ph\u01b0\u01a1ng ph\u00e1p t\u1ea3i v\u00e0 d\u00e2y d\u1eabn, ch\u1ee9 kh\u00f4ng ph\u1ea3i t\u1eeb ch\u1ec9 s\u1ed1 \u0111i\u1ec7n \u00e1p m\u1ed9t m\u00ecnh. Trong m\u1ed9t B\u1ed9 c\u00f4ng t\u1eafc MCB hai c\u1ef1c<\/strong><\/a> \u1ee8ng d\u1ee5ng, x\u00e1c nh\u1eadn xem 240V l\u00e0 d\u00f2ng \u0111\u1ebfn d\u00f2ng hay l\u00e0 m\u1ed9t m\u00f4 t\u1ea3 kh\u00e1c v\u1ec1 h\u1ec7 th\u1ed1ng \u0111\u1ecba ph\u01b0\u01a1ng. Kho\u1ea3n th\u1ee9 ba l\u00e0 \u0110i\u1ec7n \u00e1p t\u1eeb d\u00f2ng \u0111\u1ebfn d\u00f2ng<\/strong>: Ghi l\u1ea1i \u0111i\u1ec7n \u00e1p h\u1ec7 th\u1ed1ng \u0111\u00e3 \u0111o ho\u1eb7c \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh v\u00e0 s\u1ef1 c\u00e1ch ly \u0111\u1ed3ng th\u1eddi c\u1ea7n thi\u1ebft tr\u01b0\u1edbc khi ch\u1ecdn c\u1ef1c.<\/p>\n

    Sau \u0111\u00f3 h\u00e3y ki\u1ec3m tra c\u00f4ng su\u1ea5t t\u1ea3i, t\u1ea3i li\u00ean t\u1ee5c, d\u00f2ng \u0111i\u1ec7n qu\u00e1 t\u1ea3i, gi\u1edbi h\u1ea1n \u0111\u1ea7u n\u1ed1i v\u00e0 ti\u00eau chu\u1ea9n h\u1ec7 th\u1ed1ng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng. \u0110i\u1ec1u n\u00e0y gi\u00fap tr\u00e1nh \u0111\u01b0\u1ee3c sai l\u1ea7m ph\u1ed5 bi\u1ebfn khi coi 240V l\u00e0 c\u00f4ng th\u1ee9c h\u1ec7 th\u1ed1ng chung tr\u00ean t\u1ea5t c\u1ea3 c\u00e1c th\u1ecb tr\u01b0\u1eddng.<\/p>\n

    B\u00e0i vi\u1ebft li\u00ean quan: Aptomat \u0111\u00f4i 40A<\/a> cung c\u1ea5p m\u1ed9t v\u00ed d\u1ee5 c\u1ee5 th\u1ec3 v\u1ec1 vi\u1ec7c l\u1ef1a ch\u1ecdn b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n.<\/p>\n

    C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n

    C\u00f3 bao nhi\u00eau amp khi d\u00f2ng \u0111i\u1ec7n 20 A \u1edf m\u1ee9c \u0111i\u1ec7n \u00e1p 240 V?<\/h3>\n

    \u0110\u1ecbnh ngh\u0129a c\u1ee7a d\u00f2ng \u0111i\u1ec7n m\u1ea1ch l\u00e0 20 A; c\u00f4ng su\u1ea5t th\u1ef1c t\u1ebf l\u00e0 kho\u1ea3ng 4,8 kVA khi s\u1eed d\u1ee5ng h\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t \u0111\u01a1n v\u1ecb. C\u00f4ng su\u1ea5t th\u1ef1c t\u1ebf ph\u1ee5 thu\u1ed9c v\u00e0o h\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t v\u00e0 c\u00f4ng su\u1ea5t t\u1ea3i, v\u00e0 ti\u1ebfp t\u1ee5c y\u00eau c\u1ea7u c\u00e1c ki\u1ec3m tra d\u1ef1a tr\u00ean quy chu\u1ea9n cho d\u00e2y d\u1eabn v\u00e0 c\u1ea7u c\u1ea7u ch\u00ec.<\/p>\n

    Lo\u1ea1i d\u00e2y \u0111i\u1ec7n n\u00e0o \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho \u1ed5 c\u1eafm \u0111i\u1ec7n 240 V?<\/h3>\n

    \u0110i\u1ec1u n\u00e0y ph\u1ee5 thu\u1ed9c v\u00e0o v\u1eadt li\u1ec7u d\u1eabn \u0111i\u1ec7n, l\u1edbp c\u00e1ch \u0111i\u1ec7n, ph\u01b0\u01a1ng ph\u00e1p l\u1eafp \u0111\u1eb7t, \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng xung quanh v\u00e0 t\u1ea3i li\u00ean t\u1ee5c. \u0110\u1ec3 t\u00ednh ampacity, b\u1ea1n n\u00ean s\u1eed d\u1ee5ng m\u00e3 quy \u0111\u1ecbnh thay v\u00ec sao ch\u00e9p b\u1ea3ng t\u1eeb m\u1ed9t d\u1ef1 \u00e1n kh\u00e1c.<\/p>\n

    T\u00f4i c\u00f3 c\u1ea7n m\u1ed9t b\u1ed9 ng\u1eaft pha k\u00e9p cho d\u00f2ng \u0111i\u1ec7n 240 V kh\u00f4ng?<\/h3>\n

    Th\u00f4ng th\u01b0\u1eddng th\u00ec ph\u1ea3i, \u0111\u1ed1i v\u1edbi h\u1ec7 th\u1ed1ng hai d\u00e2y d\u1eabn n\u00ean c\u1ea3 hai d\u00e2y d\u1eabn \u0111\u1ec1u \u0111\u01b0\u1ee3c n\u1ed1i chung, nh\u01b0ng h\u1ec7 th\u1ed1ng ch\u00ednh x\u00e1c v\u00e0 quy \u0111\u1ecbnh \u0111\u1ecba ph\u01b0\u01a1ng s\u1ebd quy\u1ebft \u0111\u1ecbnh. X\u00e1c nh\u1eadn c\u00e1c thi\u1ebft b\u1ecb n\u1ed1i \u0111\u1ea5t v\u00e0 trung h\u00f2a.<\/p>\n

    C\u00e1ch ki\u1ec3m tra c\u1ea7u dao 240 V l\u00e0 nh\u01b0 th\u1ebf n\u00e0o?<\/h3>\n

    M\u1ed9t ng\u01b0\u1eddi c\u00f3 \u0111\u1ee7 n\u0103ng l\u1ef1c ph\u1ea3i ki\u1ec3m tra \u0111\u1ed9 li\u00ean t\u1ee5c, \u0111\u1ed9 c\u00e1ch \u0111i\u1ec7n, m\u00f4-men xo\u1eafn, c\u1ef1c \u0111\u1ed9, ho\u1ea1t \u0111\u1ed9ng ch\u1ee9c n\u0103ng v\u00e0 b\u1ea5t k\u1ef3 ki\u1ec3m tra chuy\u1ebfn ho\u1eb7c RCD n\u00e0o c\u1ea7n thi\u1ebft tr\u01b0\u1edbc khi kh\u1edfi \u0111\u1ed9ng.<\/p>\n

    T\u00e0i li\u1ec7u tham kh\u1ea3o c\u00f3 th\u1ea9m quy\u1ec1n<\/h2>\n