{"id":19607,"date":"2025-11-10T11:52:49","date_gmt":"2025-11-10T03:52:49","guid":{"rendered":"https:\/\/viox.com\/?p=19607"},"modified":"2025-11-10T11:52:51","modified_gmt":"2025-11-10T03:52:51","slug":"choose-fuse-size-12v-system","status":"publish","type":"post","link":"https:\/\/test.viox.com\/vi\/choose-fuse-size-12v-system\/","title":{"rendered":"C\u00e1ch Ch\u1ecdn K\u00edch C\u1ee1 C\u1ea7u Ch\u00ec Ph\u00f9 H\u1ee3p Cho H\u1ec7 Th\u1ed1ng \u0110i\u1ec7n 12V C\u1ee7a B\u1ea1n"},"content":{"rendered":"<div class=\"product-intro\">\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-19611\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Villain22-Fuse-A-huge-muscular-dumb-looking-30A-Automotive-Blade-Fuse.webp\" alt=\"The Villain Fuse- A huge, muscular, dumb-looking 30A Automotive Blade Fuse\" width=\"800\" height=\"800\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Villain22-Fuse-A-huge-muscular-dumb-looking-30A-Automotive-Blade-Fuse.webp 800w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Villain22-Fuse-A-huge-muscular-dumb-looking-30A-Automotive-Blade-Fuse-300x300.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Villain22-Fuse-A-huge-muscular-dumb-looking-30A-Automotive-Blade-Fuse-150x150.webp 150w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Villain22-Fuse-A-huge-muscular-dumb-looking-30A-Automotive-Blade-Fuse-768x768.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Villain22-Fuse-A-huge-muscular-dumb-looking-30A-Automotive-Blade-Fuse-12x12.webp 12w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Villain22-Fuse-A-huge-muscular-dumb-looking-30A-Automotive-Blade-Fuse-600x600.webp 600w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Villain22-Fuse-A-huge-muscular-dumb-looking-30A-Automotive-Blade-Fuse-100x100.webp 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>$800. \u0110\u00f3 l\u00e0 chi ph\u00ed c\u1ee7a h\u1ec7 th\u1ed1ng \u00e2m thanh n\u1ed5i (stereo) thay th\u1ebf.<\/p>\n<p>Vi\u1ec7c thay th\u1ebf b\u00f3 d\u00e2y \u0111i\u1ec7n? Th\u00eam $1.200 n\u1eefa. Ti\u1ec1n c\u00f4ng th\u00e1o r\u1eddi b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n v\u00e0 d\u00f2 t\u00ecm t\u1eebng s\u1ee3i d\u00e2y b\u1ecb ch\u00e1y? \u0110\u1eebng h\u1ecfi. Ng\u01b0\u1eddi \u0111i\u1ec1u ch\u1ec9nh b\u1ea3o hi\u1ec3m nh\u00e0 \u0111\u1ee9ng \u1edf \u0111\u01b0\u1eddng l\u00e1i xe c\u1ee7a b\u1ea1n v\u00e0 h\u1ecfi t\u1ea1i sao b\u1ea1n l\u1eafp c\u1ea7u ch\u00ec 30 ampe v\u00e0o d\u00e2y 18 gauge? V\u00f4 gi\u00e1\u2014nh\u01b0ng kh\u00f4ng theo ngh\u0129a t\u1ed1t.<\/p>\n<p>\u0110\u00e2y l\u00e0 nh\u1eefng g\u00ec \u0111\u00e3 x\u1ea3y ra: H\u1ec7 th\u1ed1ng \u00e2m thanh n\u1ed5i k\u00e9o 12 ampe. Ng\u01b0\u1eddi l\u1eafp \u0111\u1eb7t ngh\u0129 r\u1eb1ng \u201cc\u1ea7u ch\u00ec l\u1edbn h\u01a1n = b\u1ea3o v\u1ec7 t\u1ed1t h\u01a1n\u201d v\u00e0 l\u1eafp m\u1ed9t c\u1ea7u ch\u00ec l\u01b0\u1ee1i 30A. Ho\u1ea1t \u0111\u1ed9ng t\u1ed1t trong ba th\u00e1ng. Sau \u0111\u00f3, m\u1ed9t con \u1ed1c v\u00edt b\u1ecb l\u1ecfng b\u00ean trong b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n, d\u00e2y d\u01b0\u01a1ng b\u1ecb c\u1ecd x\u00e1t xuy\u00ean qua l\u1edbp c\u00e1ch \u0111i\u1ec7n v\u00e0 d\u00e2y 18 gauge \u0111\u00f3 \u0111\u00e3 c\u1ed1 g\u1eafng mang b\u1ea5t k\u1ef3 d\u00f2ng \u0111i\u1ec7n n\u00e0o m\u00e0 \u1eafc quy c\u00f3 th\u1ec3 cung c\u1ea5p\u2014\u1edf \u0111\u00e2u \u0111\u00f3 ph\u00eda tr\u00ean 400 ampe. C\u1ea7u ch\u00ec 30A n\u1eb1m \u0111\u00f3 m\u00e0 kh\u00f4ng l\u00e0m g\u00ec c\u1ea3 trong khi d\u00e2y bi\u1ebfn th\u00e0nh m\u1ed9t b\u1ed9 ph\u1eadn l\u00e0m n\u00f3ng. \u0110\u1ebfn khi m\u00f9i h\u01b0\u01a1ng \u0111\u1ebfn \u0111\u01b0\u1ee3c ng\u01b0\u1eddi l\u00e1i xe, m\u1ed9t n\u1eeda h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n c\u1ee7a b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n \u0111\u00e3 b\u1ecb ch\u00e1y.<\/p>\n<p>C\u1ea7u ch\u00ec kh\u00f4ng b\u1ecb n\u1ed5 v\u00ec c\u1ea7u ch\u00ec ch\u01b0a bao gi\u1edd \u1edf \u0111\u00f3 \u0111\u1ec3 b\u1ea3o v\u1ec7 h\u1ec7 th\u1ed1ng \u00e2m thanh n\u1ed5i. <strong>N\u00f3 \u1edf \u0111\u00f3 \u0111\u1ec3 b\u1ea3o v\u1ec7 d\u00e2y \u0111i\u1ec7n.<\/strong><\/p>\n<p>H\u1ea7u h\u1ebft m\u1ecdi ng\u01b0\u1eddi hi\u1ec3u sai \u0111i\u1ec1u n\u00e0y. H\u00e3y s\u1eeda n\u00f3.<\/p>\n<h2>C\u1ea7u ch\u00ec kh\u00f4ng b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n (n\u00f3 b\u1ea3o v\u1ec7 d\u00e2y \u0111i\u1ec7n c\u1ee7a b\u1ea1n)<\/h2>\n<p>\u0110\u00e2y l\u00e0 ti\u1ebft l\u1ed9 l\u00e0m thay \u0111\u1ed5i m\u1ecdi th\u1ee9: <strong>C\u1ea7u ch\u00ec c\u1ee7a b\u1ea1n l\u00e0 Ng\u01b0\u1eddi b\u1ea3o v\u1ec7 d\u00e2y \u0111i\u1ec7n, kh\u00f4ng ph\u1ea3i ng\u01b0\u1eddi b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb.<\/strong><\/p>\n<p>H\u00e3y ngh\u0129 v\u1ec1 n\u00f3. H\u1ec7 th\u1ed1ng \u00e2m thanh n\u1ed5i $800 c\u1ee7a b\u1ea1n c\u00f3 h\u1ec7 th\u1ed1ng b\u1ea3o v\u1ec7 b\u00ean trong ri\u00eang\u2014b\u1ea3ng m\u1ea1ch v\u1edbi b\u1ed9 ng\u1eaft nhi\u1ec7t, b\u1ed9 \u0111i\u1ec1u ch\u1ec9nh \u0111i\u1ec7n \u00e1p, c\u1ea7u ch\u00ec b\u00ean trong. \u0110\u1ed3 \u0111i\u1ec7n t\u1eed hi\u1ec7n \u0111\u1ea1i b\u1ea3o v\u1ec7 ch\u00ednh ch\u00fang m\u1ed9t c\u00e1ch \u0111\u00e1ng ng\u1ea1c nhi\u00ean. Nh\u01b0ng d\u00e2y 18 gauge ch\u1ea1y t\u1eeb \u1eafc quy \u0111\u1ebfn thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n th\u00ec sao? N\u00f3 ch\u1ec9 l\u00e0 \u0111\u1ed3ng v\u00e0 l\u1edbp c\u00e1ch \u0111i\u1ec7n. T\u00e1c \u0111\u1ed9ng n\u00f3 v\u1edbi 50 ampe v\u00e0 n\u00f3 bi\u1ebfn th\u00e0nh m\u1ed9t m\u1ed3i l\u1eeda $15 m\u1ed7i foot.<\/p>\n<p>C\u00f4ng vi\u1ec7c ch\u00ednh c\u1ee7a c\u1ea7u ch\u00ec l\u00e0 n\u1ed5 <em>tr\u01b0\u1edbc khi<\/em> l\u1edbp c\u00e1ch \u0111i\u1ec7n c\u1ee7a d\u00e2y b\u1ecb tan ch\u1ea3y. Thi\u1ebft b\u1ecb l\u00e0 th\u1ee9 y\u1ebfu. Tr\u00ean th\u1ef1c t\u1ebf, h\u1ea7u h\u1ebft c\u00e1c \u0111\u1ecbnh m\u1ee9c c\u1ea7u ch\u00ec do nh\u00e0 s\u1ea3n xu\u1ea5t khuy\u1ebfn ngh\u1ecb \u0111\u1ec1u th\u1ea5p h\u01a1n nh\u1eefng g\u00ec thi\u1ebft b\u1ecb c\u00f3 th\u1ec3 x\u1eed l\u00fd v\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt\u2014ch\u00fang \u0111\u01b0\u1ee3c \u0111\u1ecbnh c\u1ee1 \u0111\u1ec3 b\u1ea3o v\u1ec7 d\u00e2y m\u00e0 b\u1ea1n \u0111ang <em>c\u00f3 kh\u1ea3 n\u0103ng<\/em> s\u1eed d\u1ee5ng, kh\u00f4ng ph\u1ea3i m\u1ee9c t\u1ed1i \u0111a m\u00e0 thi\u1ebft b\u1ecb c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c.<\/p>\n<p>\u0110\u00e2y l\u00e0 ph\u00e9p to\u00e1n l\u00e0m r\u00f5 \u0111i\u1ec1u n\u00e0y: D\u00e2y 18 gauge c\u00f3 th\u1ec3 mang an to\u00e0n kho\u1ea3ng 16 ampe trong c\u00e1c c\u00e0i \u0111\u1eb7t \u00f4 t\u00f4 \u0111i\u1ec3n h\u00ecnh (d\u1ef1a tr\u00ean ti\u00eau chu\u1ea9n ABYC cho c\u00e1c \u0111\u01b0\u1eddng d\u00e2y k\u00edn). \u0110\u1eb7t c\u1ea7u ch\u00ec 30A tr\u00ean m\u1ea1ch \u0111\u00f3 v\u00e0 b\u1ea1n v\u1eeba b\u00e1o cho h\u1ec7 th\u1ed1ng \u0111i\u1ec7n \u201c\u1ed5n th\u00f4i khi \u0111\u1ea9y 30 ampe qua d\u00e2y n\u00e0y tr\u01b0\u1edbc khi b\u1ea1n n\u00ean ng\u1eaft m\u1ea1ch.\u201d Ngo\u1ea1i tr\u1eeb 30 ampe qua d\u00e2y 18 gauge t\u1ea1o ra \u0111\u1ee7 nhi\u1ec7t \u0111\u1ec3 l\u00e0m tan ch\u1ea3y l\u1edbp c\u00e1ch \u0111i\u1ec7n PVC trong v\u00f2ng ch\u01b0a \u0111\u1ea7y m\u1ed9t ph\u00fat trong qu\u00e1 tr\u00ecnh \u0111o\u1ea3n m\u1ea1ch.<\/p>\n<p><strong>\u0110\u00f3 kh\u00f4ng ph\u1ea3i l\u00e0 b\u1ea3o v\u1ec7. \u0110\u00f3 l\u00e0 m\u1ed9t h\u1ec7 th\u1ed1ng \u0111\u00e1nh l\u1eeda ch\u1eadm tr\u1ec5.<\/strong><\/p>\n<p>Kh\u00e1i ni\u1ec7m Ng\u01b0\u1eddi b\u1ea3o v\u1ec7 d\u00e2y \u0111i\u1ec7n c\u00f3 ngh\u0129a l\u00e0: <strong>\u0110\u1ecbnh c\u1ee1 c\u1ea7u ch\u00ec c\u1ee7a b\u1ea1n d\u1ef1a tr\u00ean c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n c\u1ee7a d\u00e2y tr\u01b0\u1edbc, y\u00eau c\u1ea7u c\u1ee7a thi\u1ebft b\u1ecb sau.<\/strong> N\u1ebfu thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n c\u1ea7n c\u1ea7u ch\u00ec 20A nh\u01b0ng b\u1ea1n \u0111ang s\u1eed d\u1ee5ng d\u00e2y 18 gauge (\u0111\u1ecbnh m\u1ee9c 16A), b\u1ea1n c\u1ea7n d\u00e2y l\u1edbn h\u01a1n\u2014kh\u00f4ng ph\u1ea3i c\u1ea7u ch\u00ec l\u1edbn h\u01a1n. B\u1ecf l\u1ee1 ki\u1ec3m tra n\u00e0y v\u00e0 v\u1ec1 c\u01a1 b\u1ea3n b\u1ea1n \u0111\u00e3 lo\u1ea1i b\u1ecf h\u1ec7 th\u1ed1ng an to\u00e0n c\u1ee7a m\u00ecnh trong khi v\u1eabn gi\u1eef \u1ea3o t\u01b0\u1edfng r\u1eb1ng b\u1ea1n \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7.<\/p>\n<div id='gallery-1' class='gallery galleryid-19607 gallery-columns-3 gallery-size-full'><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/test.viox.com\/vi\/what-is-the-difference-between-fuse-and-circuit-breaker\/fuse-box\/'><img decoding=\"async\" width=\"896\" height=\"860\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2024\/12\/Fuse-Box.webp\" class=\"attachment-full size-full\" alt=\"\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2024\/12\/Fuse-Box.webp 896w, https:\/\/test.viox.com\/wp-content\/uploads\/2024\/12\/Fuse-Box-300x288.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2024\/12\/Fuse-Box-768x737.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2024\/12\/Fuse-Box-13x12.webp 13w, https:\/\/test.viox.com\/wp-content\/uploads\/2024\/12\/Fuse-Box-600x576.webp 600w\" sizes=\"(max-width: 896px) 100vw, 896px\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/test.viox.com\/vi\/how-to-test-a-bad-dc-fuse-in-pv-system\/two-dc-fuse\/'><img decoding=\"async\" width=\"800\" height=\"756\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/07\/two-DC-fuse.webp\" class=\"attachment-full size-full\" alt=\"two DC fuse\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/07\/two-DC-fuse.webp 800w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/07\/two-DC-fuse-300x284.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/07\/two-DC-fuse-768x726.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/07\/two-DC-fuse-13x12.webp 13w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/07\/two-DC-fuse-600x567.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/test.viox.com\/vi\/the-complete-guide-to-fuse-holders\/pcb-panel-mount-fuse-holder-without-cover\/'><img loading=\"lazy\" decoding=\"async\" width=\"550\" height=\"550\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/07\/PCB-Panel-Mount-Fuse-Holder-Without-Cover.webp\" class=\"attachment-full size-full\" alt=\"PCB-Panel-Mount-Fuse-Holder-Without-Cover\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/07\/PCB-Panel-Mount-Fuse-Holder-Without-Cover.webp 550w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/07\/PCB-Panel-Mount-Fuse-Holder-Without-Cover-300x300.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/07\/PCB-Panel-Mount-Fuse-Holder-Without-Cover-150x150.webp 150w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/07\/PCB-Panel-Mount-Fuse-Holder-Without-Cover-12x12.webp 12w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/07\/PCB-Panel-Mount-Fuse-Holder-Without-Cover-100x100.webp 100w\" sizes=\"(max-width: 550px) 100vw, 550px\" \/><\/a>\n\t\t\t<\/div><\/figure>\n\t\t<\/div>\n\n<h2>Ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ecbnh c\u1ee1 c\u1ea7u ch\u00ec hai y\u1ebfu t\u1ed1<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-19609\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/2V-fuse-sizing-flowchart-using-two-factor-check-method-for-electrical-safety.webp\" alt=\"2V fuse sizing flowchart using two-factor check method for electrical safety\" width=\"800\" height=\"800\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/2V-fuse-sizing-flowchart-using-two-factor-check-method-for-electrical-safety.webp 800w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/2V-fuse-sizing-flowchart-using-two-factor-check-method-for-electrical-safety-300x300.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/2V-fuse-sizing-flowchart-using-two-factor-check-method-for-electrical-safety-150x150.webp 150w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/2V-fuse-sizing-flowchart-using-two-factor-check-method-for-electrical-safety-768x768.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/2V-fuse-sizing-flowchart-using-two-factor-check-method-for-electrical-safety-12x12.webp 12w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/2V-fuse-sizing-flowchart-using-two-factor-check-method-for-electrical-safety-600x600.webp 600w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/2V-fuse-sizing-flowchart-using-two-factor-check-method-for-electrical-safety-100x100.webp 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>\u0110\u1ecbnh c\u1ee1 c\u1ea7u ch\u00ec \u0111\u00fang c\u00e1ch \u0111\u00f2i h\u1ecfi ph\u1ea3i v\u01b0\u1ee3t qua hai l\u1ea7n ki\u1ec3m tra ri\u00eang bi\u1ec7t. H\u00e3y ngh\u0129 v\u1ec1 n\u00f3 nh\u01b0 m\u1ed9t c\u1ed5ng AND Boolean\u2014c\u1ea3 hai \u0111i\u1ec1u ki\u1ec7n ph\u1ea3i \u0111\u00fang, n\u1ebfu kh\u00f4ng h\u1ec7 th\u1ed1ng s\u1ebd th\u1ea5t b\u1ea1i.<\/p>\n<h3>Y\u1ebfu t\u1ed1 1: D\u00f2ng \u0111i\u1ec7n thi\u1ebft b\u1ecb \u00d7 125% = \u0110\u1ecbnh m\u1ee9c c\u1ea7u ch\u00ec t\u1ed1i thi\u1ec3u<\/h3>\n<p>\u0110\u00e2y l\u00e0 <strong>Quy t\u1eafc 125%<\/strong>. C\u1ea7u ch\u00ec c\u1ee7a b\u1ea1n c\u1ea7n l\u1edbn h\u01a1n 25% so v\u1edbi d\u00f2ng \u0111i\u1ec7n li\u00ean t\u1ee5c c\u1ee7a thi\u1ebft b\u1ecb. T\u1ea1i sao? B\u1edfi v\u00ec c\u1ea7u ch\u00ec kh\u00f4ng ph\u1ea3i l\u00e0 d\u1ee5ng c\u1ee5 ch\u00ednh x\u00e1c\u2014ch\u00fang l\u00e0 thi\u1ebft b\u1ecb nhi\u1ec7t n\u00f3ng l\u00ean v\u00e0 tan ch\u1ea3y. C\u1ea7u ch\u00ec 10A mang ch\u00ednh x\u00e1c 10A s\u1ebd t\u1eeb t\u1eeb m\u1ecfi m\u1ec7t trong nhi\u1ec1u th\u00e1ng v\u00e0 cu\u1ed1i c\u00f9ng s\u1ebd n\u1ed5, ngay c\u1ea3 khi kh\u00f4ng c\u00f3 g\u00ec sai. Bi\u00ean \u0111\u1ed9 125% ng\u0103n ng\u1eeba c\u00e1c v\u1ee5 n\u1ed5 g\u00e2y phi\u1ec1n to\u00e1i trong khi v\u1eabn cung c\u1ea5p s\u1ef1 b\u1ea3o v\u1ec7.<\/p>\n<p>V\u00ed d\u1ee5: Thanh \u0111\u00e8n LED c\u1ee7a b\u1ea1n h\u00fat 8 ampe li\u00ean t\u1ee5c.<br \/>\n\u2013 8A \u00d7 1,25 = K\u00edch th\u01b0\u1edbc c\u1ea7u ch\u00ec t\u1ed1i thi\u1ec3u 10A<\/p>\n<p>L\u00e0m tr\u00f2n l\u00ean \u0111\u1ecbnh m\u1ee9c c\u1ea7u ch\u00ec c\u00f3 s\u1eb5n ti\u1ebfp theo. N\u1ebfu t\u00ednh to\u00e1n c\u1ee7a b\u1ea1n cho b\u1ea1n 12,7A, b\u1ea1n s\u1eed d\u1ee5ng c\u1ea7u ch\u00ec 15A (\u0111\u1ecbnh m\u1ee9c c\u1ea7u ch\u00ec l\u01b0\u1ee1i ti\u00eau chu\u1ea9n: 5, 7,5, 10, 15, 20, 25, 30A). Kh\u00f4ng bao gi\u1edd l\u00e0m tr\u00f2n xu\u1ed1ng\u2014\u0111i\u1ec1u \u0111\u00f3 \u0111\u1ea3m b\u1ea3o c\u00e1c v\u1ee5 n\u1ed5 g\u00e2y phi\u1ec1n to\u00e1i. Lu\u00f4n l\u00e0m tr\u00f2n l\u00ean k\u00edch th\u01b0\u1edbc c\u00f3 s\u1eb5n ti\u1ebfp theo.<\/p>\n<h3>Y\u1ebfu t\u1ed1 2: C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n c\u1ee7a d\u00e2y \u2265 \u0110\u1ecbnh m\u1ee9c c\u1ea7u ch\u00ec<\/h3>\n<p>\u0110\u00e2y l\u00e0 ki\u1ec3m tra m\u00e0 h\u1ea7u h\u1ebft m\u1ecdi ng\u01b0\u1eddi b\u1ecf qua. D\u00e2y c\u1ee7a b\u1ea1n ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u1ecbnh m\u1ee9c \u0111\u1ec3 x\u1eed l\u00fd <em>\u00edt nh\u1ea5t<\/em> nhi\u1ec1u d\u00f2ng \u0111i\u1ec7n nh\u01b0 c\u1ea7u ch\u00ec cho ph\u00e9p \u0111i qua. Tr\u00ean th\u1ef1c t\u1ebf, th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t n\u00f3i r\u1eb1ng d\u00e2y ph\u1ea3i x\u1eed l\u00fd 125% \u0111\u1ecbnh m\u1ee9c c\u1ea7u ch\u00ec \u0111\u1ec3 c\u00f3 bi\u00ean \u0111\u1ed9 an to\u00e0n, nh\u01b0ng t\u1ed1i thi\u1ec3u n\u00f3 ph\u1ea3i kh\u1edbp.<\/p>\n<p>V\u00ed d\u1ee5 t\u01b0\u01a1ng t\u1ef1: B\u1ea1n \u0111\u00e3 t\u00ednh to\u00e1n c\u1ea7u ch\u00ec 15A cho thanh \u0111\u00e8n 8 ampe c\u1ee7a m\u00ecnh.<br \/>\n\u2013 Ki\u1ec3m tra bi\u1ec3u \u0111\u1ed3 k\u00edch th\u01b0\u1edbc d\u00e2y c\u1ee7a b\u1ea1n: B\u1ea1n c\u00f3 \u0111ang s\u1eed d\u1ee5ng d\u00e2y \u0111\u01b0\u1ee3c \u0111\u1ecbnh m\u1ee9c cho \u226515A kh\u00f4ng?<br \/>\n\u2013 18 AWG (\u00f4 t\u00f4) = \u0110\u1ecbnh m\u1ee9c 16A \u2713 (h\u1ea7u nh\u01b0 v\u01b0\u1ee3t qua, nh\u01b0ng c\u00f3 th\u1ec3 ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c)<br \/>\n\u2013 20 AWG (\u00f4 t\u00f4) = \u0110\u1ecbnh m\u1ee9c 11A \u2717 (th\u1ea5t b\u1ea1i\u2014c\u1ea7u ch\u00ec s\u1ebd cho nhi\u1ec1u d\u00f2ng \u0111i\u1ec7n \u0111i qua h\u01a1n d\u00e2y c\u00f3 th\u1ec3 x\u1eed l\u00fd)<\/p>\n<p>N\u1ebfu Y\u1ebfu t\u1ed1 2 th\u1ea5t b\u1ea1i, b\u1ea1n c\u00f3 hai l\u1ef1a ch\u1ecdn:<br \/>\n1. T\u0103ng k\u00edch th\u01b0\u1edbc d\u00e2y \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi y\u00eau c\u1ea7u c\u1ea7u ch\u00ec (gi\u1ea3i ph\u00e1p t\u1ed1t h\u01a1n)<br \/>\n2. Gi\u1ea3m k\u00edch th\u01b0\u1edbc c\u1ea7u ch\u00ec \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi \u0111\u1ecbnh m\u1ee9c d\u00e2y (ch\u1ec9 khi Y\u1ebfu t\u1ed1 1 v\u1eabn v\u01b0\u1ee3t qua)<\/p>\n<p><strong>Ki\u1ec3m tra hai y\u1ebfu t\u1ed1 kh\u00f4ng ph\u1ea3i l\u00e0 t\u00f9y ch\u1ecdn.<\/strong> B\u1ecf qua Y\u1ebfu t\u1ed1 1 v\u00e0 b\u1ea1n s\u1ebd g\u1eb7p c\u00e1c v\u1ee5 n\u1ed5 g\u00e2y phi\u1ec1n to\u00e1i. B\u1ecf qua Y\u1ebfu t\u1ed1 2 v\u00e0 b\u1ea1n s\u1ebd g\u1eb7p h\u1ecfa ho\u1ea1n.<\/p>\n<h2>Ph\u01b0\u01a1ng ph\u00e1p 4 b\u01b0\u1edbc \u0111\u1ec3 \u0111\u1ecbnh c\u1ee1 c\u1ea7u ch\u00ec ch\u00ednh x\u00e1c<\/h2>\n<p>H\u00e3y c\u00f9ng xem quy tr\u00ecnh ho\u00e0n ch\u1ec9nh v\u1edbi c\u00e1c con s\u1ed1 th\u1ef1c t\u1ebf v\u00e0 c\u00e1c t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3.<\/p>\n<h3>B\u01b0\u1edbc 1: T\u00ednh to\u00e1n m\u1ee9c ti\u00eau th\u1ee5 d\u00f2ng \u0111i\u1ec7n c\u1ee7a thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n<\/h3>\n<p>B\u1eaft \u0111\u1ea7u v\u1edbi c\u00f4ng th\u1ee9c c\u01a1 b\u1ea3n: <strong>D\u00f2ng \u0111i\u1ec7n (Ampe) = C\u00f4ng su\u1ea5t (Watt) \u00f7 \u0110i\u1ec7n \u00e1p (Volt)<\/strong><\/p>\n<p>\u0110\u1ed1i v\u1edbi h\u1ec7 th\u1ed1ng 12V: <strong>I = P \u00f7 12<\/strong><\/p>\n<p>V\u00ed d\u1ee5 th\u1ef1c t\u1ebf: B\u1ea1n \u0111ang l\u1eafp \u0111\u1eb7t thanh \u0111\u00e8n LED 100 watt tr\u00ean xe t\u1ea3i c\u1ee7a m\u00ecnh.<br \/>\n\u2013 D\u00f2ng \u0111i\u1ec7n = 100W \u00f7 12V = 8,33 ampe<\/p>\n<p>\u0110\u00f3 l\u00e0 m\u1ee9c ti\u00eau th\u1ee5 d\u00f2ng \u0111i\u1ec7n li\u00ean t\u1ee5c c\u1ee7a b\u1ea1n\u2014c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n \u1ed5n \u0111\u1ecbnh khi thi\u1ebft b\u1ecb \u0111ang ch\u1ea1y b\u00ecnh th\u01b0\u1eddng.<\/p>\n<p>Nh\u01b0ng \u0111\u00e2y l\u00e0 n\u01a1i n\u00f3 tr\u1edf n\u00ean th\u00fa v\u1ecb: <strong>d\u00f2ng \u0111i\u1ec7n li\u00ean t\u1ee5c so v\u1edbi d\u00f2ng \u0111i\u1ec7n t\u0103ng v\u1ecdt.<\/strong> M\u1ed9t s\u1ed1 thi\u1ebft b\u1ecb h\u00fat nhi\u1ec1u d\u00f2ng \u0111i\u1ec7n h\u01a1n trong qu\u00e1 tr\u00ecnh kh\u1edfi \u0111\u1ed9ng (\u0111\u1ed9ng c\u01a1, b\u1ed9 bi\u1ebfn t\u1ea7n, m\u00e1y n\u00e9n). C\u1ea7u ch\u00ec c\u00f3 th\u1ec3 x\u1eed l\u00fd c\u00e1c xung \u0111i\u1ec7n ng\u1eafn m\u00e0 kh\u00f4ng b\u1ecb n\u1ed5, nh\u01b0ng b\u1ea1n c\u1ea7n bi\u1ebft \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a thi\u1ebft b\u1ecb c\u1ee7a m\u00ecnh:<\/p>\n<ul>\n<li><strong>Tr\u1edf v\u00f4<\/strong> (\u0111\u00e8n, m\u00e1y s\u01b0\u1edfi, h\u1ea7u h\u1ebft c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed): T\u0103ng v\u1ecdt \u2248 li\u00ean t\u1ee5c. S\u1eed d\u1ee5ng d\u00f2ng \u0111i\u1ec7n li\u00ean t\u1ee5c \u0111\u1ec3 t\u00ednh to\u00e1n.<\/li>\n<li><strong>N\u1ea1p v\u00f4<\/strong> (\u0111\u1ed9ng c\u01a1, van \u0111i\u1ec7n t\u1eeb, r\u01a1le): T\u0103ng v\u1ecdt = 3-7\u00d7 li\u00ean t\u1ee5c. Ch\u00fang ta s\u1ebd x\u1eed l\u00fd ch\u00fang trong B\u01b0\u1edbc 2.<\/li>\n<\/ul>\n<p>M\u1ed9t c\u00e2n nh\u1eafc n\u1eefa: <strong>N\u1ebfu thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n li\u1ec7t k\u00ea tr\u1ef1c ti\u1ebfp c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n tr\u00ean b\u1ea3ng t\u00ean ho\u1eb7c trong s\u00e1ch h\u01b0\u1edbng d\u1eabn, h\u00e3y s\u1eed d\u1ee5ng s\u1ed1 \u0111\u00f3.<\/strong> N\u00f3 ch\u00ednh x\u00e1c h\u01a1n t\u00ednh to\u00e1n ng\u01b0\u1ee3c t\u1eeb c\u00f4ng su\u1ea5t. C\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t t\u00ednh \u0111\u1ebfn t\u1ed5n th\u1ea5t hi\u1ec7u su\u1ea5t v\u00e0 h\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t trong \u0111\u1ecbnh m\u1ee9c ampe c\u1ee7a h\u1ecd.<\/p>\n<h3>B\u01b0\u1edbc 2: \u00c1p d\u1ee5ng Quy t\u1eafc 125% (ho\u1eb7c 250% cho \u0110\u1ed9ng c\u01a1)<\/h3>\n<p>L\u1ea5y d\u00f2ng \u0111i\u1ec7n li\u00ean t\u1ee5c c\u1ee7a b\u1ea1n v\u00e0 nh\u00e2n v\u1edbi 1,25.<\/p>\n<p><strong>\u0110\u1ed1i v\u1edbi t\u1ea3i \u0111i\u1ec7n tr\u1edf (\u0111\u00e8n, thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed, m\u00e1y s\u01b0\u1edfi):<\/strong><br \/>\n\u2013 C\u1ea7u ch\u00ec t\u1ed1i thi\u1ec3u = Ampe thi\u1ebft b\u1ecb \u00d7 1,25<\/p>\n<p>Ti\u1ebfp t\u1ee5c v\u00ed d\u1ee5 v\u1ec1 thanh \u0111\u00e8n LED c\u1ee7a ch\u00fang ta:<br \/>\n\u2013 8,33A \u00d7 1,25 = 10,4A<br \/>\n\u2013 L\u00e0m tr\u00f2n l\u00ean k\u00edch th\u01b0\u1edbc ti\u00eau chu\u1ea9n ti\u1ebfp theo: <strong>C\u1ea7u ch\u00ec 15A<\/strong><\/p>\n<p><strong>\u0110\u1ed1i v\u1edbi t\u1ea3i \u0111\u1ed9ng c\u01a1 (t\u1eddi, b\u01a1m, qu\u1ea1t, m\u00e1y n\u00e9n):<\/strong><br \/>\n\u2013 C\u1ea7u ch\u00ec t\u1ed1i thi\u1ec3u = Ampe c\u1ee7a thi\u1ebft b\u1ecb \u00d7 2.5<\/p>\n<p>T\u1ea1i sao l\u1ea1i d\u00f9ng 250% cho \u0111\u1ed9ng c\u01a1? D\u00f2ng kh\u1edfi \u0111\u1ed9ng. Khi m\u00e1y b\u01a1m n\u01b0\u1edbc \u0111\u00e1y t\u00e0u kh\u1edfi \u0111\u1ed9ng l\u1ea7n \u0111\u1ea7u, n\u00f3 c\u00f3 th\u1ec3 k\u00e9o 40 ampe trong 200 mili gi\u00e2y tr\u01b0\u1edbc khi \u1ed5n \u0111\u1ecbnh \u1edf d\u00f2ng \u0111i\u1ec7n ho\u1ea1t \u0111\u1ed9ng 8 ampe. M\u1ed9t c\u1ea7u ch\u00ec ti\u00eau chu\u1ea9n 10A (125% c\u1ee7a 8A) s\u1ebd b\u1ecb n\u1ed5 m\u1ed7i khi m\u00e1y b\u01a1m kh\u1edfi \u0111\u1ed9ng. H\u1ec7 s\u1ed1 250% n\u00e0y t\u00ednh \u0111\u1ebfn s\u1ef1 t\u0103ng v\u1ecdt khi kh\u1edfi \u0111\u1ed9ng n\u00e0y.<\/p>\n<p>V\u00ed d\u1ee5: M\u00e1y b\u01a1m n\u01b0\u1edbc \u0111\u00e1y t\u00e0u 8 ampe.<br \/>\n\u2013 8A \u00d7 2.5 = C\u1ee1 c\u1ea7u ch\u00ec t\u1ed1i thi\u1ec3u 20A<\/p>\n<p><strong>Quy t\u1eafc l\u00e0m tr\u00f2n quan tr\u1ecdng: Lu\u00f4n l\u00e0m tr\u00f2n L\u00caN \u0111\u1ebfn c\u1ee1 c\u1ea7u ch\u00ec c\u00f3 s\u1eb5n ti\u1ebfp theo, kh\u00f4ng bao gi\u1edd l\u00e0m tr\u00f2n xu\u1ed1ng.<\/strong> C\u00e1c c\u1ee1 c\u1ea7u ch\u00ec l\u01b0\u1ee1i dao \u00f4 t\u00f4 ti\u00eau chu\u1ea9n l\u00e0 5, 7.5, 10, 15, 20, 25, 30A. N\u1ebfu t\u00ednh to\u00e1n c\u1ee7a b\u1ea1n cho ra 12A, h\u00e3y s\u1eed d\u1ee5ng 15A. N\u1ebfu n\u00f3 cho ra 17A, h\u00e3y s\u1eed d\u1ee5ng 20A. L\u00e0m tr\u00f2n xu\u1ed1ng g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng n\u1ed5 c\u1ea7u ch\u00ec kh\u00f3 ch\u1ecbu; l\u00e0m tr\u00f2n l\u00ean \u0111\u00e3 \u0111\u01b0\u1ee3c t\u00ednh \u0111\u1ebfn trong bi\u00ean \u0111\u1ed9 an to\u00e0n.<\/p>\n<h3>B\u01b0\u1edbc 3: Ki\u1ec3m tra kh\u1ea3 n\u0103ng t\u1ea3i d\u00f2ng c\u1ee7a d\u00e2y d\u1eabn<\/h3>\n<p>B\u00e2y gi\u1edd \u0111\u1ebfn <strong>Ki\u1ec3m tra Hai y\u1ebfu t\u1ed1<\/strong> y\u1ebfu t\u1ed1 th\u1ee9 hai. B\u1ea1n \u0111\u00e3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c c\u1ee1 c\u1ea7u ch\u00ec t\u1ed1i thi\u1ec3u c\u1ee7a m\u00ecnh\u2014nh\u01b0ng d\u00e2y d\u1eabn c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c n\u00f3 kh\u00f4ng?<\/p>\n<p>Kh\u1ea3 n\u0103ng t\u1ea3i d\u00f2ng c\u1ee7a d\u00e2y d\u1eabn ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ed9t s\u1ed1 y\u1ebfu t\u1ed1:<br \/>\n&#8211; <strong>Ti\u1ebft di\u1ec7n d\u00e2y (AWG):<\/strong> S\u1ed1 c\u00e0ng nh\u1ecf = d\u00e2y c\u00e0ng d\u00e0y = kh\u1ea3 n\u0103ng t\u1ea3i d\u00f2ng c\u00e0ng cao<br \/>\n&#8211; <strong>Chi\u1ec1u d\u00e0i d\u00e2y:<\/strong> C\u00e1c \u0111o\u1ea1n d\u00e2y d\u00e0i h\u01a1n c\u1ea7n d\u00e2y l\u1edbn h\u01a1n \u0111\u1ec3 gi\u1ea3m \u0111i\u1ec7n \u00e1p (t\u00e1ch bi\u1ec7t v\u1edbi kh\u1ea3 n\u0103ng t\u1ea3i d\u00f2ng, nh\u01b0ng c\u00f3 li\u00ean quan)<br \/>\n&#8211; <strong>Ph\u01b0\u01a1ng ph\u00e1p l\u1eafp \u0111\u1eb7t:<\/strong> K\u00edn trong \u1ed1ng d\u1eabn\/b\u00f3 so v\u1edbi kh\u00f4ng kh\u00ed t\u1ef1 do<br \/>\n&#8211; <strong>Nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng:<\/strong> Khoang \u0111\u1ed9ng c\u01a1 so v\u1edbi kh\u00f4ng gian cabin<\/p>\n<p><strong>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 bi\u1ec3u \u0111\u1ed3 kh\u1ea3 n\u0103ng t\u1ea3i d\u00f2ng c\u1ee7a d\u00e2y 12V \u0111\u01a1n gi\u1ea3n h\u00f3a cho c\u00e1c c\u00e0i \u0111\u1eb7t \u00f4 t\u00f4 \u0111i\u1ec3n h\u00ecnh<\/strong> (d\u1ef1a tr\u00ean m\u1ee9c cho ph\u00e9p gi\u1ea3m \u0111i\u1ec7n \u00e1p 3% v\u00e0 h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n k\u00edn):<\/p>\n<table>\n<tbody>\n<tr>\n<th>C\u1ee1 d\u00e2y<\/th>\n<th>D\u00f2ng \u0111i\u1ec7n t\u1ed1i \u0111a (Ampe)<\/th>\n<th>\u0110i\u1ec3n H\u00ecnh D\u1ee5ng<\/th>\n<\/tr>\n<tr>\n<td>20 AWG<\/td>\n<td>11A<\/td>\n<td>\u0110\u00e8n LED nh\u1ecf, ph\u1ee5 ki\u1ec7n<\/td>\n<\/tr>\n<tr>\n<td>18 AWG<\/td>\n<td>16A<\/td>\n<td>\u0110\u00e8n chi\u1ebfu s\u00e1ng trung b\u00ecnh, radio, b\u1ed9 s\u1ea1c \u0111i\u1ec7n tho\u1ea1i<\/td>\n<\/tr>\n<tr>\n<td>16 AWG<\/td>\n<td>22A<\/td>\n<td>\u0110\u00e8n l\u1edbn h\u01a1n, \u1ed5 c\u1eafm \u0111i\u1ec7n, m\u00e1y b\u01a1m nh\u1ecf<\/td>\n<\/tr>\n<tr>\n<td>14 AWG<\/td>\n<td>32A<\/td>\n<td>Ph\u1ee5 ki\u1ec7n n\u1eb7ng, bi\u1ebfn t\u1ea7n nh\u1ecf<\/td>\n<\/tr>\n<tr>\n<td>12 AWG<\/td>\n<td>41A<\/td>\n<td>Bi\u1ebfn t\u1ea7n l\u1edbn, ph\u1ee5 ki\u1ec7n d\u00f2ng \u0111i\u1ec7n cao<\/td>\n<\/tr>\n<tr>\n<td>10 AWG<\/td>\n<td>55A<\/td>\n<td>T\u1eddi, bi\u1ebfn t\u1ea7n l\u1edbn, ngu\u1ed3n c\u1ea5p ch\u00ednh<\/td>\n<\/tr>\n<tr>\n<td>8 AWG<\/td>\n<td>73A<\/td>\n<td>Bi\u1ebfn t\u1ea7n c\u00f4ng su\u1ea5t cao (1000W+), ph\u00e2n ph\u1ed1i ch\u00ednh<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Ki\u1ec3m tra quan tr\u1ecdng:<\/strong> \u0110\u1ecbnh m\u1ee9c c\u1ea7u ch\u00ec c\u1ee7a b\u1ea1n ph\u1ea3i \u2264 \u0111\u1ecbnh m\u1ee9c kh\u1ea3 n\u0103ng t\u1ea3i d\u00f2ng c\u1ee7a d\u00e2y d\u1eabn.<\/p>\n<p>Quay l\u1ea1i thanh \u0111\u00e8n LED c\u1ee7a ch\u00fang ta:<br \/>\n\u2013 C\u1ea7u ch\u00ec \u0111\u00e3 t\u00ednh: 15A<br \/>\n\u2013 D\u00e2y d\u1eabn \u0111\u1ec1 xu\u1ea5t: 18 AWG (\u0111\u1ecbnh m\u1ee9c 16A)<br \/>\n\u2013 Ki\u1ec3m tra: 15A \u2264 16A \u2713 <strong>\u0110\u1ea0T<\/strong> (v\u1eeba \u0111\u1ee7, nh\u01b0ng ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c)<\/p>\n<p>N\u1ebfu b\u1ea1n \u0111ang s\u1eed d\u1ee5ng 20 AWG (\u0111\u1ecbnh m\u1ee9c 11A) thay th\u1ebf:<br \/>\n\u2013 Ki\u1ec3m tra: 15A \u2264 11A \u2717 <strong>KH\u00d4NG \u0110\u1ea0T<\/strong><br \/>\n\u2013 Gi\u1ea3i ph\u00e1p: N\u00e2ng c\u1ea5p l\u00ean d\u00e2y 18 AWG ho\u1eb7c l\u1edbn h\u01a1n<\/p>\n<p><strong>M\u1eb9o chuy\u00ean nghi\u1ec7p: Khi b\u1ea1n g\u1ea7n v\u1edbi \u0111\u1ecbnh m\u1ee9c c\u1ee7a d\u00e2y (trong v\u00f2ng 2-3 ampe), h\u00e3y t\u0103ng m\u1ed9t c\u1ee1 d\u00e2y.<\/strong> C\u1ea7u ch\u00ec 15A \u0111\u00f3 tr\u00ean d\u00e2y 18 AWG s\u1ebd ho\u1ea1t \u0111\u1ed9ng, nh\u01b0ng 16 AWG cho b\u1ea1n bi\u00ean nhi\u1ec7t l\u1edbn h\u01a1n v\u00e0 gi\u1ea3m \u0111i\u1ec7n \u00e1p. D\u00e2y d\u1eabn r\u1ebb h\u01a1n so v\u1edbi vi\u1ec7c kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 \u0111i\u1ec7n kh\u00f4ng li\u00ean t\u1ee5c.<\/p>\n<p>Nhi\u1ec7t \u0111\u1ed9 c\u0169ng quan tr\u1ecdng. Bi\u1ec3u \u0111\u1ed3 kh\u1ea3 n\u0103ng t\u1ea3i d\u00f2ng c\u1ee7a d\u00e2y \u0111\u00f3 gi\u1ea3 \u0111\u1ecbnh nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng xung quanh l\u00e0 30\u00b0C (86\u00b0F). N\u1ebfu b\u1ea1n \u0111ang ch\u1ea1y d\u00e2y qua khoang \u0111\u1ed9ng c\u01a1 n\u01a1i nhi\u1ec7t \u0111\u1ed9 \u0111\u1ea1t 60\u00b0C (140\u00b0F), b\u1ea1n c\u1ea7n gi\u1ea3m c\u00f4ng su\u1ea5t c\u1ee7a d\u00e2y kho\u1ea3ng 30%. M\u1ed9t d\u00e2y 16A trong m\u00f4i tr\u01b0\u1eddng n\u00f3ng s\u1ebd tr\u1edf th\u00e0nh d\u00e2y 11A m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. Khi nghi ng\u1edd, h\u00e3y t\u0103ng m\u1ed9t c\u1ee1 l\u1edbn h\u01a1n.<\/p>\n<h3>B\u01b0\u1edbc 4: Ch\u1ecdn Lo\u1ea1i C\u1ea7u Ch\u00ec v\u00e0 \u0110\u1eb7t \u0110\u00fang V\u1ecb Tr\u00ed<\/h3>\n<p>B\u1ea1n \u0111\u00e3 t\u00ednh to\u00e1n c\u1ee1 c\u1ea7u ch\u00ec c\u1ee7a m\u00ecnh v\u00e0 x\u00e1c minh d\u00e2y d\u1eabn c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c n\u00f3. B\u00e2y gi\u1edd: lo\u1ea1i c\u1ea7u ch\u00ec n\u00e0o v\u00e0 n\u00f3 \u0111i \u0111\u00e2u?<\/p>\n<p><strong>C\u00e1c lo\u1ea1i c\u1ea7u ch\u00ec cho h\u1ec7 th\u1ed1ng 12V:<\/strong><\/p>\n<ul>\n<li><strong>C\u1ea7u ch\u00ec l\u01b0\u1ee1i dao (ATO\/ATC\/Mini\/Maxi)<\/strong> \u2014 1A \u0111\u1ebfn 40A<br \/>\n\u2013 \u01afu \u0111i\u1ec3m: R\u1ebb, c\u00f3 s\u1eb5n tr\u00ean to\u00e0n c\u1ea7u, m\u00e3 h\u00f3a m\u00e0u, d\u1ec5 thay th\u1ebf<br \/>\n\u2013 Nh\u01b0\u1ee3c \u0111i\u1ec3m: Kh\u1ea3 n\u0103ng ch\u1ed1ng rung k\u00e9m tr\u00ean 20A, c\u00e1c ti\u1ebfp \u0111i\u1ec3m c\u00f3 th\u1ec3 b\u1ecb \u0103n m\u00f2n<br \/>\n\u2013 S\u1eed d\u1ee5ng cho: C\u00e1c m\u1ea1ch ri\u00eang l\u1ebb, ph\u1ee5 ki\u1ec7n, chi\u1ebfu s\u00e1ng, \u0111i\u1ec7n t\u1eed<br \/>\n\u2013 T\u1ed1t nh\u1ea5t cho d\u00f2ng \u0111i\u1ec7n: D\u01b0\u1edbi 30A<\/li>\n<li><strong>C\u1ea7u ch\u00ec ANL<\/strong> \u2014 30A \u0111\u1ebfn 750A<br \/>\n\u2013 \u01afu \u0111i\u1ec3m: \u0110\u1ea7u n\u1ed1i b\u1eaft v\u00edt, kh\u1ea3 n\u0103ng ch\u1ed1ng rung tuy\u1ec7t v\u1eddi, \u0111\u1ecbnh m\u1ee9c ng\u1eaft cao<br \/>\n\u2013 Nh\u01b0\u1ee3c \u0111i\u1ec3m: L\u1edbn h\u01a1n, \u0111\u1eaft h\u01a1n, c\u1ea7n gi\u00e1 \u0111\u1ee1 c\u1ee5 th\u1ec3<br \/>\n\u2013 S\u1eed d\u1ee5ng cho: B\u1ea3o v\u1ec7 pin ch\u00ednh, bi\u1ebfn t\u1ea7n, thi\u1ebft b\u1ecb c\u00f4ng su\u1ea5t cao<br \/>\n\u2013 T\u1ed1t nh\u1ea5t cho d\u00f2ng \u0111i\u1ec7n: 30A tr\u1edf l\u00ean<\/li>\n<li><strong>C\u1ea7u ch\u00ec MIDI<\/strong> \u2014 20A \u0111\u1ebfn 100A<br \/>\n\u2013 \u01afu \u0111i\u1ec3m: \u0110i\u1ec3m trung gian gi\u1eefa c\u1ea7u ch\u00ec d\u1eb9t v\u00e0 ANL, nh\u1ecf g\u1ecdn h\u01a1n ANL<br \/>\n\u2013 Nh\u01b0\u1ee3c \u0111i\u1ec3m: \u00cdt ph\u1ed5 bi\u1ebfn h\u01a1n c\u1ea7u ch\u00ec d\u1eb9t<br \/>\n\u2013 S\u1eed d\u1ee5ng cho: \u0110i\u1ec3m ph\u00e2n ph\u1ed1i, m\u1ea1ch c\u00f4ng su\u1ea5t trung b\u00ecnh-cao<br \/>\n\u2013 T\u1ed1t nh\u1ea5t cho d\u00f2ng \u0111i\u1ec7n: 30-100A<\/li>\n<\/ul>\n<p>Cho \u0111\u00e8n LED 15A c\u1ee7a ch\u00fang ta? Ti\u00eau chu\u1ea9n <strong>C\u1ea7u ch\u00ec d\u1eb9t ATC<\/strong> l\u00e0 ho\u00e0n h\u1ea3o.<\/p>\n<p><strong>B\u00e2y gi\u1edd \u0111\u1ebfn ph\u1ea7n quan tr\u1ecdng: v\u1ecb tr\u00ed \u0111\u1eb7t.<\/strong> Nh\u1eadp <strong>Quy t\u1eafc 7 Inch.<\/strong><\/p>\n<p><strong>M\u1ecdi c\u1ea7u ch\u00ec ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u1eb7t trong v\u00f2ng 7 inch (18cm) t\u00ednh t\u1eeb ngu\u1ed3n \u0111i\u1ec7n.<\/strong> \u0110\u1ed1i v\u1edbi m\u1ea1ch ch\u1ea1y b\u1eb1ng pin, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 trong v\u00f2ng 7 inch t\u00ednh t\u1eeb c\u1ef1c d\u01b0\u01a1ng c\u1ee7a pin. \u0110\u1ed1i v\u1edbi c\u00e1c m\u1ea1ch nh\u00e1nh t\u1eeb kh\u1ed1i ph\u00e2n ph\u1ed1i, trong v\u00f2ng 7 inch t\u00ednh t\u1eeb \u0111i\u1ec3m ph\u00e2n ph\u1ed1i.<\/p>\n<p>T\u1ea1i sao l\u1ea1i l\u00e0 7 inch? B\u1edfi v\u00ec b\u1ea5t k\u1ef3 \u0111o\u1ea1n d\u00e2y kh\u00f4ng c\u00f3 c\u1ea7u ch\u00ec n\u00e0o c\u0169ng l\u00e0 m\u1ed9t \u0111\u00e1m ch\u00e1y \u0111ang ch\u1edd x\u1ea3y ra. N\u1ebfu d\u00e2y d\u01b0\u01a1ng c\u1ee7a b\u1ea1n b\u1ecb c\u1ecd x\u00e1t xuy\u00ean qua l\u1edbp c\u00e1ch \u0111i\u1ec7n v\u00e0 ch\u1ea1m \u0111\u1ea5t, th\u00ec m\u1ed7i inch gi\u1eefa pin v\u00e0 c\u1ea7u ch\u00ec s\u1ebd tr\u1edf th\u00e0nh m\u1ed9t d\u00e2y d\u1eabn c\u1ed1 g\u1eafng truy\u1ec1n h\u00e0ng tr\u0103m ampe. B\u1ea3y inch d\u00e2y 18 gauge c\u00f3 th\u1ec3 t\u1ea1o ra 50-100 watt nhi\u1ec7t trong qu\u00e1 tr\u00ecnh \u0111o\u1ea3n m\u1ea1ch\u2014\u0111\u1ee7 \u0111\u1ec3 \u0111\u1ed1t ch\u00e1y l\u1edbp c\u00e1ch \u0111i\u1ec7n c\u1ee7a d\u00e2y ho\u1eb7c c\u00e1c v\u1eadt li\u1ec7u l\u00e2n c\u1eadn trong v\u00e0i gi\u00e2y.<\/p>\n<p>B\u1ea3n th\u00e2n gi\u00e1 \u0111\u1ee1 c\u1ea7u ch\u00ec c\u0169ng quan tr\u1ecdng:<br \/>\n\u2013 S\u1eed d\u1ee5ng gi\u00e1 \u0111\u1ee1 c\u1ea7u ch\u00ec \u0111\u01b0\u1ee3c \u0111\u1ecbnh m\u1ee9c ph\u00f9 h\u1ee3p (kh\u00f4ng \u0111\u1eb7t c\u1ea7u ch\u00ec 30A v\u00e0o gi\u00e1 \u0111\u1ee1 10A)<br \/>\n\u2013 B\u1ea5m c\u00e1c \u0111\u1ea7u n\u1ed1i \u0111\u00fang c\u00e1ch (k\u1ebft n\u1ed1i l\u1ecfng l\u1ebbo = nhi\u1ec7t = h\u1ecfng)<br \/>\n\u2013 S\u1eed d\u1ee5ng gi\u00e1 \u0111\u1ee1 ch\u1ed1ng n\u01b0\u1edbc cho c\u00e1c \u1ee9ng d\u1ee5ng h\u00e0ng h\u1ea3i ho\u1eb7c c\u00e1c v\u1ecb tr\u00ed ti\u1ebfp x\u00fac<br \/>\n\u2013 C\u00e2n nh\u1eafc s\u1eed d\u1ee5ng kh\u1ed1i c\u1ea7u ch\u00ec cho nhi\u1ec1u m\u1ea1ch thay v\u00ec c\u00e1c gi\u00e1 \u0111\u1ee1 inline ri\u00eang l\u1ebb<\/p>\n<p>M\u1ed9t l\u01b0u \u00fd cu\u1ed1i c\u00f9ng: <strong>Ch\u1ec9 l\u1eafp c\u1ea7u ch\u00ec \u1edf ph\u00eda d\u01b0\u01a1ng, kh\u00f4ng bao gi\u1edd \u1edf c\u1ea3 hai ph\u00eda.<\/strong> \u0110\u01b0\u1eddng h\u1ed3i \u00e2m (n\u1ed1i \u0111\u1ea5t) \u00e2m ph\u1ea3i kh\u00f4ng c\u00f3 c\u1ea7u ch\u00ec v\u00e0 li\u00ean t\u1ee5c. L\u1eafp c\u1ea7u ch\u00ec \u1edf c\u1ea3 hai ph\u00eda t\u1ea1o ra m\u1ed9t t\u00ecnh hu\u1ed1ng trong \u0111\u00f3 c\u1ea7u ch\u00ec ph\u00eda n\u1ed1i \u0111\u1ea5t b\u1ecb \u0111\u1ee9t khi\u1ebfn v\u1ecf thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n \u1edf \u0111i\u1ec7n \u00e1p pin\u2014g\u00e2y nguy c\u01a1 \u0111i\u1ec7n gi\u1eadt v\u00e0 h\u1ecfa ho\u1ea1n.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-19612\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/A-22Fuse-Type-Comparison-Table22-graphic.webp\" alt=\"A &quot;Fuse Type Comparison Table&quot; graphic.\" width=\"800\" height=\"800\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/A-22Fuse-Type-Comparison-Table22-graphic.webp 800w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/A-22Fuse-Type-Comparison-Table22-graphic-300x300.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/A-22Fuse-Type-Comparison-Table22-graphic-150x150.webp 150w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/A-22Fuse-Type-Comparison-Table22-graphic-768x768.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/A-22Fuse-Type-Comparison-Table22-graphic-12x12.webp 12w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/A-22Fuse-Type-Comparison-Table22-graphic-600x600.webp 600w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/A-22Fuse-Type-Comparison-Table22-graphic-100x100.webp 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>3 Sai L\u1ea7m Nguy Hi\u1ec3m Nh\u1ea5t Khi Ch\u1ecdn K\u00edch C\u1ee1 C\u1ea7u Ch\u00ec<\/h2>\n<p>H\u00e3y n\u00f3i v\u1ec1 c\u00e1c ch\u1ebf \u0111\u1ed9 h\u1ecfng h\u00f3c bi\u1ebfn thi\u1ebft b\u1ecb an to\u00e0n th\u00e0nh nguy c\u01a1 h\u1ecfa ho\u1ea1n.<\/p>\n<h3>Sai L\u1ea7m #1: Quan Ni\u1ec7m Sai L\u1ea7m \"C\u00e0ng L\u1edbn C\u00e0ng An To\u00e0n\"<\/h3>\n<p>\u201cC\u1ea7u ch\u00ec c\u1ee9 b\u1ecb \u0111\u1ee9t, v\u00ec v\u1eady t\u00f4i \u0111\u00e3 t\u0103ng l\u00ean k\u00edch th\u01b0\u1edbc ti\u1ebfp theo. V\u1ea5n \u0111\u1ec1 \u0111\u00e3 \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft!\u201d<\/p>\n<p>Ngo\u1ea1i tr\u1eeb vi\u1ec7c v\u1ea5n \u0111\u1ec1 kh\u00f4ng \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft\u2014n\u00f3 ch\u1ec9 b\u1ecb tr\u00ec ho\u00e3n. C\u1ea7u ch\u00ec \u0111\u00f3 b\u1ecb \u0111\u1ee9t v\u00ec m\u1ed9t l\u00fd do: ho\u1eb7c thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n \u0111ang h\u00fat d\u00f2ng \u0111i\u1ec7n l\u1edbn h\u01a1n d\u1ef1 ki\u1ebfn (c\u00f3 th\u1ec3 b\u1ecb h\u1ecfng), ho\u1eb7c d\u00e2y c\u1ee7a b\u1ea1n c\u00f3 k\u00edch th\u01b0\u1edbc qu\u00e1 nh\u1ecf. T\u0103ng k\u00edch th\u01b0\u1edbc c\u1ea7u ch\u00ec ch\u1ec9 b\u00e1o cho h\u1ec7 th\u1ed1ng \u0111i\u1ec7n \u201cb\u1ecf qua v\u1ea5n \u0111\u1ec1 cho \u0111\u1ebfn khi c\u00f3 th\u1ee9 g\u00ec \u0111\u00f3 tan ch\u1ea3y.\u201d<\/p>\n<p>T\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf: Kh\u00e1ch h\u00e0ng l\u1eafp bi\u1ebfn t\u1ea7n 400 watt tr\u00ean d\u00e2y 14 AWG (\u0111\u1ecbnh m\u1ee9c 32A). S\u1eed d\u1ee5ng c\u1ea7u ch\u00ec 40A v\u00ec \u201cbi\u1ebfn t\u1ea7n c\u1ea7n 35 ampe, v\u00ec v\u1eady 40 l\u00e0 k\u00edch th\u01b0\u1edbc ti\u1ebfp theo.\u201d T\u00ednh to\u00e1n c\u00f3 v\u1ebb \u0111\u00fang, ph\u1ea3i kh\u00f4ng?<\/p>\n<p>Sai. D\u01b0\u1edbi t\u1ea3i cao li\u00ean t\u1ee5c, bi\u1ebfn t\u1ea7n \u0111\u00f3 h\u00fat 38 ampe li\u00ean t\u1ee5c. C\u1ea7u ch\u00ec 40A kh\u00f4ng bao gi\u1edd b\u1ecb \u0111\u1ee9t. D\u00e2y 14 AWG n\u00f3ng l\u00ean \u0111\u1ebfn 90\u00b0C v\u00e0 b\u1eaft \u0111\u1ea7u l\u00e0m tan ch\u1ea3y l\u1edbp c\u00e1ch \u0111i\u1ec7n. Chi ph\u00ed: Bi\u1ebfn t\u1ea7n $400 (h\u01b0 h\u1ecfng do nhi\u1ec7t), thay th\u1ebf b\u00f3 d\u00e2y $800, chi ph\u00ed nh\u00e2n c\u00f4ng $1,200.<\/p>\n<p>Gi\u1ea3i ph\u00e1p \u0111\u00fang: D\u00e2y 10 AWG (\u0111\u1ecbnh m\u1ee9c 55A) v\u1edbi c\u1ea7u ch\u00ec 40A. Dung l\u01b0\u1ee3ng d\u00e2y v\u01b0\u1ee3t qu\u00e1 \u0111\u1ecbnh m\u1ee9c c\u1ea7u ch\u00ec, m\u1ecdi th\u1ee9 \u0111\u1ec1u \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7.<\/p>\n<p><strong>Quan Ni\u1ec7m Sai L\u1ea7m \"C\u00e0ng L\u1edbn C\u00e0ng An To\u00e0n\" gi\u1ebft ch\u1ebft nhi\u1ec1u h\u1ec7 th\u1ed1ng \u0111i\u1ec7n h\u01a1n l\u00e0 c\u1ea7u ch\u00ec c\u00f3 k\u00edch th\u01b0\u1edbc qu\u00e1 nh\u1ecf.<\/strong> Khi c\u1ea7u ch\u00ec b\u1ecb \u0111\u1ee9t, n\u00f3 \u0111ang h\u00e9t l\u00ean \u201ch\u00e3y kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 th\u1ef1c t\u1ebf!\u201d B\u1ecbt mi\u1ec7ng n\u00f3 b\u1eb1ng c\u00e1ch t\u0103ng k\u00edch th\u01b0\u1edbc ch\u1ec9 t\u1eaft b\u00e1o \u0111\u1ed9ng trong khi \u0111\u00e1m ch\u00e1y \u00e2m \u1ec9.<\/p>\n<h3>Sai L\u1ea7m #2: B\u1ecf Qua Kh\u1ea3 N\u0103ng Ch\u1ecbu T\u1ea3i C\u1ee7a D\u00e2y D\u1eabn (S\u1ef1 C\u1ed1 Ng\u01b0\u1eddi B\u1ea3o V\u1ec7 D\u00e2y D\u1eabn)<\/h3>\n<p>M\u1ecdi ng\u01b0\u1eddi ch\u1ecdn k\u00edch th\u01b0\u1edbc c\u1ea7u ch\u00ec ch\u1ec9 d\u1ef1a tr\u00ean y\u00eau c\u1ea7u c\u1ee7a thi\u1ebft b\u1ecb v\u00e0 qu\u00ean ki\u1ec3m tra xem d\u00e2y c\u1ee7a h\u1ecd c\u00f3 th\u1ec3 x\u1eed l\u00fd \u0111\u01b0\u1ee3c hay kh\u00f4ng. \u0110\u00f3 l\u00e0 c\u00e1ch ph\u1ed5 bi\u1ebfn nh\u1ea5t \u0111\u1ec3 b\u1ecf qua h\u1ec7 th\u1ed1ng an to\u00e0n c\u1ee7a ch\u00ednh b\u1ea1n.<\/p>\n<p>Ph\u00e9p to\u00e1n c\u00f3 v\u1ebb h\u1ee3p l\u00fd: \u201c\u00c2m thanh n\u1ed5i c\u1ee7a t\u00f4i c\u1ea7n 20 ampe, v\u00ec v\u1eady t\u00f4i s\u1ebd s\u1eed d\u1ee5ng c\u1ea7u ch\u00ec 25A (quy t\u1eafc 125%).\u201d Sau \u0111\u00f3, b\u1ea1n ch\u1ea1y d\u00e2y 18 gauge (\u0111\u1ecbnh m\u1ee9c 16A) v\u00ec n\u00f3 \u0111\u00e3 c\u00f3 trong xe ho\u1eb7c \u0111\u00f3 l\u00e0 nh\u1eefng g\u00ec c\u1eeda h\u00e0ng ph\u1ee5 t\u00f9ng khuy\u00ean d\u00f9ng.<\/p>\n<p>B\u00e2y gi\u1edd b\u1ea1n c\u00f3 m\u1ed9t c\u1ea7u ch\u00ec s\u1ebd vui v\u1ebb truy\u1ec1n 25 ampe qua d\u00e2y \u0111\u01b0\u1ee3c \u0111\u1ecbnh m\u1ee9c cho 16 ampe. Trong qu\u00e1 tr\u00ecnh \u0111o\u1ea3n m\u1ea1ch, d\u00e2y \u0111\u00f3 tr\u1edf th\u00e0nh c\u1ea7u ch\u00ec\u2014ngo\u1ea1i tr\u1eeb vi\u1ec7c n\u00f3 b\u1ecb \u0111\u1ee9t b\u1eb1ng c\u00e1ch tan ch\u1ea3y v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng \u0111\u1ed1t ch\u00e1y b\u1ea5t c\u1ee9 th\u1ee9 g\u00ec \u1edf g\u1ea7n.<\/p>\n<p>Ki\u1ec3m tra: \u0110\u1ecbnh m\u1ee9c c\u1ea7u ch\u00ec \u2264 \u0110\u1ecbnh m\u1ee9c d\u00e2y. Lu\u00f4n lu\u00f4n. Kh\u00f4ng c\u00f3 ngo\u1ea1i l\u1ec7.<\/p>\n<h3>Sai L\u1ea7m #3: \u0110\u1eb7t Sai V\u1ecb Tr\u00ed C\u1ea7u Ch\u00ec (V\u1ea5n \u0110\u1ec1 D\u00e2y Kh\u00f4ng C\u00f3 C\u1ea7u Ch\u00ec)<\/h3>\n<p>C\u1ea7u ch\u00ec c\u00e1ch pin ba feet? \u201cG\u1ea7n \u0111\u1ee7, ph\u1ea3i kh\u00f4ng?\u201d Kh\u00f4ng. Ba feet d\u00e2y kh\u00f4ng c\u00f3 c\u1ea7u ch\u00ec \u0111\u00f3 l\u00e0 m\u1ed9t m\u1ed1i nguy hi\u1ec3m.<\/p>\n<p>T\u1ea1i sao \u0111i\u1ec1u n\u00e0y l\u1ea1i quan tr\u1ecdng: Pin c\u00f3 th\u1ec3 cung c\u1ea5p <em>h\u00e0ng tr\u0103m ampe<\/em> trong qu\u00e1 tr\u00ecnh \u0111o\u1ea3n m\u1ea1ch\u2014ch\u1ec9 gi\u1edbi h\u1ea1n b\u1edfi \u0111i\u1ec7n tr\u1edf b\u00ean trong v\u00e0 \u0111i\u1ec7n tr\u1edf d\u00e2y. Ngay c\u1ea3 12 inch d\u00e2y 14 AWG mang 400 ampe c\u0169ng t\u1ea1o ra kho\u1ea3ng 32 watt nhi\u1ec7t tr\u00ean m\u1ed7i foot. Tr\u00ean 3 feet, \u0111\u00f3 l\u00e0 g\u1ea7n 100 watt nhi\u1ec7t trong d\u00e2y. L\u1edbp c\u00e1ch \u0111i\u1ec7n tan ch\u1ea3y. C\u00e1c d\u00e2y li\u1ec1n k\u1ec1 b\u1eaft \u0111\u1ea7u tan ch\u1ea3y. M\u1ecdi th\u1ee9 tr\u1edf n\u00ean th\u00fa v\u1ecb nhanh ch\u00f3ng.<\/p>\n<p>Quy t\u1eafc 7 Inch t\u1ed3n t\u1ea1i v\u00ec th\u1eed nghi\u1ec7m \u0111\u00e3 ch\u1ec9 ra r\u1eb1ng 7 inch d\u00e2y c\u00f3 k\u00edch th\u01b0\u1edbc ph\u00f9 h\u1ee3p c\u00f3 th\u1ec3 s\u1ed1ng s\u00f3t sau m\u1ed9t s\u1ef1 ki\u1ec7n \u0111o\u1ea3n m\u1ea1ch \u0111\u1ee7 l\u00e2u \u0111\u1ec3 c\u1ea7u ch\u00ec b\u1ecb \u0111\u1ee9t m\u00e0 kh\u00f4ng g\u00e2y ra h\u01b0 h\u1ecfng th\u1ee9 c\u1ea5p. \u0110\u1ea9y n\u00f3 \u0111\u1ebfn 3 feet v\u00e0 b\u1ea1n \u0111ang \u0111\u00e1nh b\u1ea1c r\u1eb1ng c\u1ea7u ch\u00ec s\u1ebd b\u1ecb \u0111\u1ee9t tr\u01b0\u1edbc khi l\u1edbp c\u00e1ch \u0111i\u1ec7n c\u1ee7a d\u00e2y b\u1ecb h\u1ecfng \u1edf \u0111\u00e2u \u0111\u00f3 trong \u0111o\u1ea1n d\u00e2y kh\u00f4ng c\u00f3 c\u1ea7u ch\u00ec \u0111\u00f3.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-19608\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Proper-12V-fuse-placement-within-7-inches-of-battery-positive-terminal-for-automotive-safety.webp\" alt=\"Proper 12V fuse placement within 7 inches of battery positive terminal for automotive safety\" width=\"800\" height=\"800\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Proper-12V-fuse-placement-within-7-inches-of-battery-positive-terminal-for-automotive-safety.webp 800w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Proper-12V-fuse-placement-within-7-inches-of-battery-positive-terminal-for-automotive-safety-300x300.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Proper-12V-fuse-placement-within-7-inches-of-battery-positive-terminal-for-automotive-safety-150x150.webp 150w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Proper-12V-fuse-placement-within-7-inches-of-battery-positive-terminal-for-automotive-safety-768x768.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Proper-12V-fuse-placement-within-7-inches-of-battery-positive-terminal-for-automotive-safety-12x12.webp 12w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Proper-12V-fuse-placement-within-7-inches-of-battery-positive-terminal-for-automotive-safety-600x600.webp 600w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Proper-12V-fuse-placement-within-7-inches-of-battery-positive-terminal-for-automotive-safety-100x100.webp 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><strong>\u0110\u1eb7t c\u1ea7u ch\u00ec trong v\u00f2ng 7 inch t\u00ednh t\u1eeb ngu\u1ed3n \u0111i\u1ec7n.<\/strong> \u0110\u00f3 kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t g\u1ee3i \u00fd\u2014\u0111\u00f3 l\u00e0 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa c\u1ea7u ch\u00ec b\u1ecb \u0111\u1ee9t v\u00e0 h\u1ecfa ho\u1ea1n do d\u00e2y \u0111i\u1ec7n.<\/p>\n<div class=\"ast-oembed-container\" style=\"height: 100%;\"><iframe title=\"C\u00e1ch Ch\u1ecdn K\u00edch Th\u01b0\u1edbc C\u1ea7u Ch\u00ec Ch\u00ednh X\u00e1c Cho H\u1ec7 Th\u1ed1ng \u0110i\u1ec7n 12V C\u1ee7a B\u1ea1n | 12 Volt Planet\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/PR8rzV88qCU?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<h2>\u0110i D\u00e2y H\u1ec7 Th\u1ed1ng C\u1ee7a B\u1ea1n \u0110\u00fang C\u00e1ch (V\u00e0 Gi\u1eef N\u00f3 Nh\u01b0 V\u1eady)<\/h2>\n<p>C\u1ea7u ch\u00ec l\u00e0 Ng\u01b0\u1eddi B\u1ea3o V\u1ec7 D\u00e2y D\u1eabn\u2014ch\u1ecdn k\u00edch th\u01b0\u1edbc \u0111\u1ec3 b\u1ea3o v\u1ec7 d\u00e2y, x\u00e1c minh d\u00e2y c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 x\u1eed l\u00fd c\u1ea7u ch\u00ec, \u0111\u1eb7t n\u00f3 trong v\u00f2ng 7 inch t\u00ednh t\u1eeb ngu\u1ed3n \u0111i\u1ec7n.<\/p>\n<p><strong>Danh s\u00e1ch ki\u1ec3m tra nhanh tr\u01b0\u1edbc khi b\u1ea1n c\u1ea5p \u0111i\u1ec7n cho b\u1ea5t k\u1ef3 m\u1ea1ch n\u00e0o:<\/strong><br \/>\n\u2013 \u2713 D\u00f2ng \u0111i\u1ec7n thi\u1ebft b\u1ecb \u0111\u00e3 \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n (Watts \u00f7 12V = Amps)<br \/>\n\u2013 \u2713 \u0110\u00e3 \u00e1p d\u1ee5ng 125% (ho\u1eb7c 250% cho \u0111\u1ed9ng c\u01a1)<br \/>\n\u2013 \u2713 Kh\u1ea3 n\u0103ng ch\u1ecbu t\u1ea3i c\u1ee7a d\u00e2y \u0111\u00e3 \u0111\u01b0\u1ee3c ki\u1ec3m tra (c\u1ea7u ch\u00ec \u2264 \u0111\u1ecbnh m\u1ee9c d\u00e2y)<br \/>\n\u2013 \u2713 C\u1ea7u ch\u00ec \u0111\u01b0\u1ee3c \u0111\u1eb7t trong v\u00f2ng 7\u2033 t\u00ednh t\u1eeb ngu\u1ed3n \u0111i\u1ec7n<br \/>\n\u2013 \u2713 Lo\u1ea1i c\u1ea7u ch\u00ec ph\u00f9 h\u1ee3p \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ecdn cho m\u1ee9c d\u00f2ng \u0111i\u1ec7n<br \/>\n\u2013 \u2713 T\u1ea5t c\u1ea3 c\u00e1c k\u1ebft n\u1ed1i \u0111\u01b0\u1ee3c b\u1ea5m \u0111\u00fang c\u00e1ch v\u00e0 c\u00e1c \u0111\u1ea7u n\u1ed1i \u0111\u01b0\u1ee3c \u0111\u1ecbnh m\u1ee9c cho d\u00f2ng \u0111i\u1ec7n<\/p>\n<p>H\u00e3y nh\u1edb v\u1ee5 h\u1ecfa ho\u1ea1n \u00e2m thanh n\u1ed5i $800 t\u1eeb ph\u1ea7n m\u1edf \u0111\u1ea7u? \u0110\u00e2y l\u00e0 c\u00e1ch n\u00f3 n\u00ean \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n: \u00e2m thanh n\u1ed5i 12 ampe, c\u1ea7u ch\u00ec 15A (12A \u00d7 1.25), d\u00e2y 16 AWG (\u0111\u1ecbnh m\u1ee9c 22A), c\u1ea7u ch\u00ec \u0111\u01b0\u1ee3c \u0111\u1eb7t c\u00e1ch c\u1ef1c d\u01b0\u01a1ng c\u1ee7a pin 6 inch. Dung l\u01b0\u1ee3ng d\u00e2y v\u01b0\u1ee3t qu\u00e1 \u0111\u1ecbnh m\u1ee9c c\u1ea7u ch\u00ec. C\u1ea7u ch\u00ec n\u1eb1m trong v\u00f2ng 7 inch. N\u1ebfu v\u00edt g\u1eafn \u0111\u00f3 b\u1ecb l\u1ecfng v\u00e0 l\u00e0m \u0111o\u1ea3n m\u1ea1ch d\u00e2y, c\u1ea7u ch\u00ec s\u1ebd b\u1ecb \u0111\u1ee9t trong mili gi\u00e2y\u2014tr\u01b0\u1edbc khi d\u00e2y n\u00f3ng l\u00ean \u0111\u1ee7 \u0111\u1ec3 l\u00e0m tan ch\u1ea3y b\u1ea5t c\u1ee9 th\u1ee9 g\u00ec.<\/p>\n<p>T\u1ed5ng chi ph\u00ed \u0111\u1ec3 l\u00e0m \u0111\u00fang: $18 cho d\u00e2y ph\u00f9 h\u1ee3p, $2 cho c\u1ea7u ch\u00ec ch\u00ednh x\u00e1c, th\u00eam 15 ph\u00fat th\u1eddi gian l\u1eafp \u0111\u1eb7t.<\/p>\n<p>T\u1ed5ng chi ph\u00ed \u0111\u1ec3 l\u00e0m sai: $2,800 v\u00e0 gi\u1ea3i th\u00edch cho ng\u01b0\u1eddi \u0111i\u1ec1u ch\u1ec9nh b\u1ea3o hi\u1ec3m l\u00fd do t\u1ea1i sao b\u1ea1n ngh\u0129 r\u1eb1ng c\u1ea7u ch\u00ec 30A tr\u00ean d\u00e2y 18 gauge l\u00e0 m\u1ed9t \u00fd ki\u1ebfn hay.<\/p>\n<p><strong><a href=\"https:\/\/test.viox.com\/vi\/fuse-vs-mcb-response-time\/\">C\u1ea7u ch\u00ec<\/a> l\u00e0 b\u1ea3o hi\u1ec3m r\u1ebb nh\u1ea5t trong h\u1ec7 th\u1ed1ng \u0111i\u1ec7n c\u1ee7a b\u1ea1n.<\/strong> Ch\u1ecdn k\u00edch th\u01b0\u1edbc ch\u00fang d\u1ef1a tr\u00ean kh\u1ea3 n\u0103ng ch\u1ecbu t\u1ea3i c\u1ee7a d\u00e2y, kh\u00f4ng ph\u1ea3i l\u00e0 suy ngh\u0129 vi\u1ec3n v\u00f4ng. Ng\u01b0\u1eddi B\u1ea3o V\u1ec7 D\u00e2y D\u1eabn ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng n\u1ebfu b\u1ea1n cho ph\u00e9p n\u00f3 th\u1ef1c hi\u1ec7n c\u00f4ng vi\u1ec7c c\u1ee7a m\u00ecnh.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>$800. That&#8217;s what the aftermarket stereo cost. The wiring harness replacement? Another $1,200. Labor to tear apart the dashboard and trace every melted wire? Don&#8217;t ask. The homeowner&#8217;s insurance adjuster standing in your driveway asking why you installed a 30-amp fuse on 18-gauge wire? Priceless\u2014but not in a good way. Here&#8217;s what happened: The stereo [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":19613,"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-19607","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\/19607","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=19607"}],"version-history":[{"count":2,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/19607\/revisions"}],"predecessor-version":[{"id":19615,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/19607\/revisions\/19615"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/media\/19613"}],"wp:attachment":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/media?parent=19607"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/categories?post=19607"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/tags?post=19607"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}