{"id":2689,"date":"2022-01-12T15:15:55","date_gmt":"2022-01-12T08:15:55","guid":{"rendered":"https:\/\/bestray.com\/blog\/?p=2689"},"modified":"2024-02-27T16:31:56","modified_gmt":"2024-02-27T09:31:56","slug":"tieu-chuan-tcvn-47561989-ve-noi-dat-va-noi-khong-thiet-bi-dien","status":"publish","type":"post","link":"https:\/\/bestray.com\/blog\/tieu-chuan-tcvn-47561989-ve-noi-dat-va-noi-khong-thiet-bi-dien\/","title":{"rendered":"Ti\u00eau chu\u1ea9n tcvn 4756:1989 v\u1ec1 n\u1ed1i \u0111\u1ea5t v\u00e0 n\u1ed1i kh\u00f4ng thi\u1ebft b\u1ecb \u0111i\u1ec7n"},"content":{"rendered":"<p style=\"text-align: justify;\">Ti\u00eau chu\u1ea9n TCVN 4756:1989 v\u1ec1 n\u1ed1i \u0111\u1ea5t v\u00e0 n\u1ed1i kh\u00f4ng thi\u1ebft b\u1ecb \u0111i\u1ec7n \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng cho thi\u1ebft b\u1ecb \u0111i\u1ec7n m\u1ed9t chi\u1ec1u c\u00f3 gi\u00e1 tr\u1ecb \u0111i\u1ec7n \u00e1p l\u1edbn h\u01a1n 110V, v\u00e0 thi\u1ebft b\u1ecb \u0111i\u1ec7n xoay chi\u1ec1u c\u00f3 gi\u00e1 tr\u1ecb \u0111i\u1ec7n \u00e1p l\u1edbn h\u01a1n 42V. Ti\u00eau chu\u1ea9n n\u00e0y gi\u00fap cho vi\u1ec7c l\u1eafp \u0111\u1eb7t v\u00e0 s\u1eed d\u1ee5ng thi\u1ebft b\u1ecb \u0111i\u1ec7n \u0111\u01b0\u1ee3c \u0111\u1ea3m b\u1ea3o an to\u00e0n v\u1edbi c\u00e1c quy \u0111\u1ecbnh r\u00f5 r\u00e0ng, ch\u1eb7t ch\u1ebd. V\u1eady ti\u00eau chu\u1ea9n TCVN 4756:1989 l\u00e0 g\u00ec? H\u00e3y c\u00f9ng Bestray t\u00ecm hi\u1ec3u n\u1ed9i dung n\u00e0y trong b\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y.<\/p>\n<h2 style=\"text-align: justify;\"><strong>1. Y\u00eau c\u1ea7u chung c\u1ee7a TCVN 4756:1989<\/strong><\/h2>\n<p style=\"text-align: justify;\">1.1. Theo TCVN 4756:1989, m\u1ea1ng \u0111i\u1ec7n xoay chi\u1ec1u c\u00f3 gi\u00e1 tr\u1ecb \u0111i\u1ec7n \u00e1p \u0111\u1ebfn 1000V v\u00e0 c\u00f3 \u0111i\u1ec3m trung t\u00ednh n\u1ed1i \u0111\u1ea5t tr\u1ef1c ti\u1ebfp ho\u1eb7c c\u00e1ch ly. C\u00e1c m\u1ea1ng \u0111i\u1ec7n m\u1ed9t chi\u1ec1u c\u00f3 th\u1ec3 c\u00f3 \u0111i\u1ec3m gi\u1eefa c\u00e1ch ly ho\u1eb7c n\u1ed1i \u0111\u1ea5t tr\u1ef1c ti\u1ebfp. TCVN 4756:1989 \u0111\u1ed1i v\u1edbi c\u00e1c ngu\u1ed3n \u0111i\u1ec7n m\u1ed9t pha th\u00ec c\u00f3 th\u1ec3 c\u00f3 c\u1ea3 hai \u0111\u1ea7u ra c\u00e1ch ly ho\u1eb7c m\u1ed9t \u0111\u1ea7u ra n\u1ed1i \u0111\u1ea5t tr\u1ef1c ti\u1ebfp.<\/p>\n<p style=\"text-align: justify;\">Trong m\u1ea1ng \u0111i\u1ec7n m\u1ed9t chi\u1ec1u ba d\u00e2y v\u00e0 m\u1ea1ng \u0111i\u1ec7n ba pha b\u1ed1n d\u00e2y trong TCVN 4756:1989 b\u1eaft bu\u1ed9c ph\u1ea3i n\u1ed1i \u0111\u1ea5t tr\u1ef1c ti\u1ebfp \u0111i\u1ec3m trung t\u00ednh ho\u1eb7c gi\u1eefa ngu\u1ed3n \u0111i\u1ec7n.<\/p>\n<p style=\"text-align: justify;\">1.2. C\u00e1c thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c cung c\u1ea5p \u0111i\u1ec7n t\u1eeb m\u1ea1ng c\u00f3 \u0111i\u1ec7n \u00e1p \u0111\u1ebfn 1000V v\u00e0 c\u00f3 \u0111i\u1ec3m trung t\u00ednh n\u1ed1i \u0111\u1ea5t tr\u1ef1c ti\u1ebfp, ho\u1eb7c t\u1eeb c\u00e1c m\u1ea1ng m\u1ed9t chi\u1ec1u ba d\u00e2y c\u00f3 \u0111i\u1ec3m gi\u1eefa n\u1ed1i \u0111\u1ea5t tr\u1ef1c ti\u1ebfp. C\u0169ng nh\u01b0 t\u1eeb c\u00e1c ngu\u1ed3n \u0111i\u1ec7n m\u1ed9t pha c\u00f3 \u0111\u1ea7u ra n\u1ed1i \u0111\u1ea5t tr\u1ef1c ti\u1ebfp c\u1ea7n ph\u1ea3i \u0111\u01b0\u1ee3c n\u1ed1i &#8220;kh\u00f4ng&#8221; trong TCVN 4756:1989.<\/p>\n<p style=\"text-align: justify;\">1.3. Theo TCVN 4756:1989, \u0111\u1ed1i v\u1edbi m\u1ea1ng \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n \u00e1p \u0111\u1ebfn 1000V c\u00f3 \u0111i\u1ec3m trung t\u00ednh c\u00e1ch ly, ho\u1eb7c c\u00e1c m\u1ea1ng \u0111i\u1ec7n m\u1ed9t chi\u1ec1u c\u00f3 \u0111i\u1ec3m gi\u1eefa \u0111\u01b0\u1ee3c c\u00e1ch ly v\u1edbi \u0111\u1ea5t. C\u0169ng nh\u01b0 ngu\u1ed3n \u0111i\u1ec7n m\u1ed9t pha c\u00f3 c\u00e1c \u0111\u1ea7u ra \u0111\u01b0\u1ee3c c\u00e1ch ly v\u1edbi \u0111\u1ea5t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 cung c\u1ea5p \u0111i\u1ec7n cho c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n trong tr\u01b0\u1eddng h\u1ee3p c\u00f3 nh\u1eefng y\u00eau c\u1ea7u v\u1ec1 an to\u00e0n \u0111i\u1ec7n cao (khai th\u00e1c than v\u00e0 m\u1ecf, c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n di \u0111\u1ed9ng). V\u00e0 ph\u1ea3i n\u1ed1i \u0111\u1ea5t k\u1ebft h\u1ee3p v\u1edbi ki\u1ec3m tra c\u00e1ch \u0111i\u1ec7n c\u1ee7a m\u1ea1ng \u0111\u1ed1i v\u1edbi c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n ho\u1eb7c s\u1eed d\u1ee5ng m\u00e1y c\u1eaft \u0111i\u1ec7n b\u1ea3o v\u1ec7.<\/p>\n<p style=\"text-align: justify;\">1.4. TCVN 4756:1989 cho ph\u00e9p n\u1ed1i \u0111\u1ea5t \u0111\u1ed1i v\u1edbi thi\u1ebft b\u1ecb \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n \u00e1p l\u1edbn h\u01a1n 1000V c\u00f3 \u0111i\u1ec3m trung t\u00ednh c\u00e1ch ly.<\/p>\n<p style=\"text-align: justify;\">1.5. Theo TCVN 4756:1989, nh\u1eefng b\u1ed9 ph\u1eadn c\u1ea7n \u0111\u01b0\u1ee3c n\u1ed1i \u0111\u1ea5t ho\u1eb7c n\u1ed1i &#8220;kh\u00f4ng&#8221; bao g\u1ed3m:<\/p>\n<ul style=\"text-align: justify;\">\n<li>V\u1ecf m\u00e1y bi\u1ebfn \u00e1p, v\u1ecf m\u00e1y \u0111i\u1ec7n, c\u00e1c kh\u00ed c\u1ee5 \u0111i\u1ec7n, c\u00e1c thi\u1ebft b\u1ecb chi\u1ebfu s\u00e1ng,&#8230;<\/li>\n<li>B\u1ed9 ph\u1eadn truy\u1ec1n \u0111\u1ed9ng c\u1ee7a thi\u1ebft b\u1ecb \u0111i\u1ec7n<\/li>\n<li>C\u00e1c cu\u1ed9n th\u1ee9 c\u1ea5p c\u1ee7a m\u00e1y bi\u1ebfn \u00e1p \u0111o l\u01b0\u1eddng<\/li>\n<li>Khung c\u1ee7a t\u1ee7 ph\u00e2n ph\u1ed1i \u0111i\u1ec7n, b\u1ea3ng \u0111i\u1ec7n v\u00e0 t\u1ee7 \u0111i\u1ec7n, b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n v\u00e0 c\u00e1c b\u1ed9 ph\u1eadn c\u00f3 th\u1ec3 h\u1edf ho\u1eb7c th\u00e1o ra \u0111\u01b0\u1ee3c n\u1ebfu nh\u01b0 tr\u00ean \u0111\u00f3 \u0111\u1eb7t c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n.<\/li>\n<li>Nh\u1eefng k\u1ebft c\u1ea5u \u0111\u1eb7t c\u00e1p, k\u1ebft c\u1ea5u kim lo\u1ea1i c\u1ee7a thi\u1ebft b\u1ecb ph\u00e2n ph\u1ed1i, nh\u1eefng \u0111\u1ea7u m\u1ed1i b\u1eb1ng kim lo\u1ea1i, v\u1ecf kim lo\u1ea1i v\u00e0 v\u1ecf b\u1ecdc c\u1ee7a c\u00e1p l\u1ef1c v\u00e0 c\u00e1p ki\u1ec3m tra<\/li>\n<li>V\u1ecf kim lo\u1ea1i c\u1ee7a d\u00e2y d\u1eabn \u0111i\u1ec7n, v\u1ecf v\u00e0 gi\u00e1 \u0111\u1ee1 c\u1ee7a thanh c\u00e1i d\u1eabn \u0111i\u1ec7n, \u1ed1ng kim lo\u1ea1i lu\u1ed3n d\u00e2y d\u1eabn \u0111i\u1ec7n<\/li>\n<li>C\u00e1c m\u00e1ng, h\u1ed9p, thanh th\u00e9p, d\u00e2y c\u00e1p th\u00e9p, d\u00e2y c\u00e1p v\u00e0 d\u00e2y d\u1eabn \u0111i\u1ec7n c\u0169ng nh\u01b0 c\u00e1c k\u1ebft c\u1ea5u kim lo\u1ea1i kh\u00e1c tr\u00ean \u0111\u00f3 \u0111\u1eb7t c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n<\/li>\n<li>V\u1ecf kim lo\u1ea1i c\u1ee7a c\u00e1c m\u00e1y \u0111i\u1ec7n c\u1ea7m tay v\u00e0 di \u0111\u1ed9ng<\/li>\n<li>C\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf c\u00e1c c\u01a1 c\u1ea5u v\u00e0 c\u00e1c b\u1ed9 ph\u1eadn \u0111\u1ed9ng c\u1ee7a m\u00e1y.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">1.6. Theo TCVN 4756:1989, nh\u1eefng b\u1ed9 ph\u1eadn sau kh\u00f4ng y\u00eau c\u1ea7u n\u1ed1i \u0111\u1ea5t ho\u1eb7c n\u1ed1i &#8220;kh\u00f4ng&#8221;:<\/p>\n<ul style=\"text-align: justify;\">\n<li>C\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n m\u1ed9t chi\u1ec1u c\u00f3 \u0111i\u1ec7n \u00e1p \u0111\u1ebfn 440V v\u00e0 \u0111i\u1ec7n xoay chi\u1ec1u c\u00f3 \u0111i\u1ec7n \u00e1p \u0111\u1ebfn 380V trong c\u00e1c m\u00f4i tr\u01b0\u1eddng \u00edt nguy hi\u1ec3m v\u1ec1 \u0111i\u1ec7n.<\/li>\n<li>D\u1ee5ng c\u1ee5 \u0111i\u1ec7n, v\u1ecf c\u1ee7a thi\u1ebft b\u1ecb \u0111i\u1ec7n v\u00e0 c\u00e1c k\u1ebft c\u1ea5u l\u1eafp r\u00e1p \u0111i\u1ec7n \u0111\u01b0\u1ee3c \u0111\u1eb7t tr\u00ean c\u00e1c k\u1ebft c\u1ea5u kim lo\u1ea1i, c\u00e1c khung, t\u1ee7, c\u00e1c thi\u1ebft b\u1ecb ph\u00e2n ph\u1ed1i, tr\u00ean b\u1ec7 m\u00e1y c\u00f4ng c\u1ee5, b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n v\u00e0 c\u00e1c m\u00e1y c\u00e1i \u0111\u00e3 \u0111\u01b0\u1ee3c n\u1ed1i &#8220;kh\u00f4ng&#8221; ho\u1eb7c n\u1ed1i \u0111\u1ea5t v\u1edbi \u0111i\u1ec1u ki\u1ec7n b\u1ea3o \u0111\u1ea3m ti\u1ebfp x\u00fac v\u1ec1 \u0111i\u1ec7n ch\u1eafc ch\u1eafn v\u1edbi h\u1ec7 th\u1ed1ng n\u1ed1i \u201ckh\u00f4ng\u201d ho\u1eb7c n\u1ed1i \u0111\u1ea5t ch\u00ednh.<\/li>\n<li>T\u1ea5t c\u1ea3 c\u00e1c k\u1ebft c\u1ea5u \u0111\u01b0\u1ee3c n\u00eau ra \u1edf m\u1ee5c th\u1ee9 5 \u0111\u00e3 \u0111\u01b0\u1ee3c n\u00eau \u0111i\u1ec1u 1.5 trong TCVN 4756:1989 v\u1edbi \u0111i\u1ec1u ki\u1ec7n gi\u1eefa thi\u1ebft b\u1ecb \u0111i\u1ec7n \u0111\u00e3 \u0111\u01b0\u1ee3c n\u1ed1i \u0111\u1ea5t ho\u1eb7c n\u1ed1i &#8220;kh\u00f4ng&#8221; \u0111\u01b0\u1ee3c \u0111\u1eb7t tr\u00ean c\u00e1c k\u1ebft c\u1ea5u n\u00e0y c\u00f3 m\u1ed1i ti\u1ebfp x\u00fac \u0111i\u1ec7n ch\u1eafc ch\u1eafn. Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, t\u1ea5t c\u1ea3 c\u00e1c k\u1ebft c\u1ea5u \u0111\u01b0\u1ee3c n\u00eau \u1edf tr\u00ean kh\u00f4ng th\u1ec3 s\u1eed d\u1ee5ng \u0111\u1ec3 n\u1ed1i \u201ckh\u00f4ng\u201d ho\u1eb7c n\u1ed1i \u0111\u1ea5t cho c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n kh\u00e1c \u0111\u01b0\u1ee3c \u0111\u1eb7t tr\u00ean n\u00f3.<\/li>\n<\/ul>\n<figure id=\"attachment_2690\" aria-describedby=\"caption-attachment-2690\" style=\"width: 2560px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2690\" src=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-1-IMG_0464-scaled.jpg\" alt=\"L\u1eafp \u0111\u1eb7t thi\u1ebft b\u1ecb \u0111i\u1ec7n theo TCVN 4756:1989\" width=\"2560\" height=\"1920\" srcset=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-1-IMG_0464-scaled.jpg 2560w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-1-IMG_0464-300x225.jpg 300w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-1-IMG_0464-1024x768.jpg 1024w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-1-IMG_0464-768x576.jpg 768w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-1-IMG_0464-1536x1152.jpg 1536w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-1-IMG_0464-2048x1536.jpg 2048w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-1-IMG_0464-696x522.jpg 696w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-1-IMG_0464-1068x801.jpg 1068w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-1-IMG_0464-1920x1440.jpg 1920w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-2690\" class=\"wp-caption-text\"><span style=\"font-size: 16px;\">L\u1eafp \u0111\u1eb7t thi\u1ebft b\u1ecb \u0111i\u1ec7n theo TCVN 4756:1989<\/span><\/figcaption><\/figure>\n<h2 style=\"text-align: justify;\"><strong>2. N\u1ed1i \u0111\u1ea5t c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n theo TCVN 4756:1989<\/strong><\/h2>\n<h3 style=\"text-align: justify;\"><strong>2.1. N\u1ed1i thi\u1ebft b\u1ecb \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n \u00e1p l\u1edbn h\u01a1n 1000V trong m\u1ea1ng \u0111i\u1ec7n trung t\u00ednh n\u1ed1i theo TCVN 4756:1989<\/strong><\/h3>\n<p style=\"text-align: justify;\">2.1.1. TCVN 4756:1989 quy \u0111\u1ecbnh ph\u1ea3i \u0111\u1ea3m b\u1ea3o tr\u1ecb s\u1ed1 \u0111i\u1ec7n \u00e1p tr\u1ea1m, tr\u1ecb s\u1ed1 \u0111i\u1ec7n tr\u1edf n\u1ed1i \u0111\u1ea5t, \u0111i\u1ec7n \u00e1p tr\u00ean trang b\u1ecb n\u1ed1i \u0111\u1ea5t v\u00e0 c\u00e1c bi\u1ec7n ph\u00e1p k\u1ebft c\u1ea5u khi trang b\u1ecb n\u1ed1i \u0111\u1ea5t c\u1ee7a thi\u1ebft b\u1ecb \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n \u00e1p l\u1edbn h\u01a1n 1000V trong m\u1ea1ng \u0111i\u1ec7n trung t\u00ednh n\u1ed1i \u0111\u1ea5t. C\u00e1c y\u00eau c\u1ea7u n\u00e0y kh\u00f4ng \u00e1p d\u1ee5ng cho trang b\u1ecb n\u1ed1i \u0111\u1ea5t \u1edf c\u00e1c c\u1ed9t \u0111i\u1ec7n c\u1ee7a \u0111\u01b0\u1eddng d\u00e2y t\u1ea3i \u0111i\u1ec7n.<\/p>\n<p style=\"text-align: justify;\">2.1.2. \u0110i\u1ec7n tr\u1edf c\u1ee7a trang b\u1ecb n\u1ed1i \u0111\u1ea5t c\u00f3 t\u00ednh \u0111i\u1ec7n tr\u1edf n\u1ed1i \u0111\u1ea5t t\u1ef1 nhi\u00ean, kh\u00f4ng \u0111\u01b0\u1ee3c v\u01b0\u1ee3t qu\u00e1 0,5 trong b\u1ea5t c\u1ee9 th\u1eddi gian n\u00e0o trong n\u0103m, v\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c v\u01b0\u1ee3t qu\u00e1 1 \u0111\u1ed1i v\u1edbi \u0111i\u1ec7n tr\u1edf c\u1ee7a n\u1ed1i \u0111\u1ea5t nh\u00e2n t\u1ea1o theo TCVN 4756:1989.<\/p>\n<p style=\"text-align: justify;\">2.1.3. Theo ti\u00eau chu\u1ea9n TCVN 4756:1989 ph\u1ea3i \u0111\u1ea3m b\u1ea3o tr\u1ecb s\u1ed1 \u0111i\u1ec7n \u00e1p ch\u1ea1m khi trang b\u1ecb n\u1ed1i \u0111\u1ea5t kh\u00f4ng l\u1edbn h\u01a1n gi\u00e1 tr\u1ecb quy \u0111\u1ecbnh trong m\u1ecdi th\u1eddi gian n\u00e0o trong n\u0103m khi c\u00f3 d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch ch\u1ea1y qua.<\/p>\n<p style=\"text-align: justify;\">Khi x\u00e1c \u0111\u1ecbnh gi\u00e1 tr\u1ecb cho ph\u00e9p c\u1ee7a \u0111i\u1ec7n \u00e1p ch\u1ea1m, th\u1eddi gian t\u00e1c \u0111\u1ed9ng t\u00ednh to\u00e1n b\u1eb1ng t\u1ed5ng th\u1eddi gian c\u1eaft to\u00e0n ph\u1ea7n c\u1ee7a m\u00e1y c\u1eaft, th\u1eddi gian t\u00e1c \u0111\u1ed9ng c\u1ee7a b\u1ea3o v\u1ec7.<\/p>\n<p style=\"text-align: justify;\">2.1.4. Ti\u00eau chu\u1ea9n TCVN 4756:1989 cho ph\u00e9p d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch ch\u1ea1m \u0111\u1ea5t ch\u1ea1y qua \u0111i\u1ec7n \u00e1p tr\u00ean trang b\u1ecb n\u1ed1i \u0111\u1ea5t kh\u00f4ng \u0111\u01b0\u1ee3c v\u01b0\u1ee3t qu\u00e1 10kV. V\u00e0 \u0111i\u1ec7n \u00e1p tr\u00ean trang b\u1ecb n\u1ed1i \u0111\u1ea5t l\u1edbn h\u01a1n 10kV, trong tr\u01b0\u1eddng h\u1ee3p lo\u1ea1i tr\u1eeb \u0111\u01b0\u1ee3c kh\u1ea3 n\u0103ng truy\u1ec1n \u0111i\u1ec7n t\u1eeb trang b\u1ecb n\u1ed1i \u0111\u1ea5t ra, ngo\u00e0i ph\u1ea1m vi nh\u00e0 v\u00e0 h\u00e0ng r\u00e0o b\u00ean ngo\u00e0i c\u1ee7a thi\u1ebft b\u1ecb \u0111i\u1ec7n. Ngo\u00e0i ra, ph\u1ea3i c\u00f3 bi\u1ec7n ph\u00e1p b\u1ea3o v\u1ec7 c\u00e1ch \u0111i\u1ec7n cho h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa t\u1eeb thi\u1ebft b\u1ecb \u0111i\u1ec7n \u0111i ra.<\/p>\n<p style=\"text-align: justify;\">Theo TCVN 4756:1989, c\u00e1c \u0111\u01b0\u1eddng c\u00e1p th\u00f4ng tin v\u00e0 c\u00e1c bi\u1ec7n ph\u00e1p \u0111\u1ec3 kh\u1eafc ph\u1ee5c hi\u1ec7n t\u01b0\u1ee3ng lan truy\u1ec1n \u0111i\u1ec7n th\u1ebf g\u00e2y nguy hi\u1ec3m ra ngo\u00e0i ph\u1ea1m vi b\u1ea3o v\u1ec7 c\u1ee7a thi\u1ebft b\u1ecb \u0111i\u1ec7n, khi \u0111i\u1ec7n \u00e1p tr\u00ean c\u00e1c trang b\u1ecb n\u1ed1i \u0111\u1ea5t l\u1edbn h\u01a1n 5kV theo TCVN 4756:1989.<\/p>\n<p style=\"text-align: justify;\">2.1.5. \u0110\u1ec3 san b\u1eb1ng v\u00e0 \u0111\u1ea3m b\u1ea3o n\u1ed1i \u0111i\u1ec7n c\u1ef1c n\u1ed1i \u0111\u1ea5t v\u1edbi thi\u1ebft b\u1ecb \u0111i\u1ec7n trong ti\u00eau chu\u1ea9n TCVN 4756:1989, ph\u1ea3i \u0111\u1eb7t c\u00e1c \u0111i\u1ec7n c\u1ef1c n\u1ed1i \u0111\u1ea5t n\u1eb1m ngang tr\u00ean di\u1ec7n t\u00edch \u0111\u1eb7t thi\u1ebft b\u1ecb \u0111i\u1ec7n theo chi\u1ec1u d\u00e0i v\u00e0 chi\u1ec1u r\u1ed9ng c\u1ee7a di\u1ec7n t\u00edch \u0111\u00f3, ho\u1eb7c n\u1ed1i c\u00e1c \u0111i\u1ec3m c\u1ef1c v\u1edbi nhau th\u00e0nh l\u01b0\u1edbi n\u1ed1i \u0111\u1ea5t.<\/p>\n<figure id=\"attachment_2691\" aria-describedby=\"caption-attachment-2691\" style=\"width: 1920px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2691\" src=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-2-IMG_0462-scaled.jpg\" alt=\"N\u1ed1i \u0111\u1ea5t thi\u1ebft b\u1ecb \u0111i\u1ec7n\" width=\"1920\" height=\"2560\" srcset=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-2-IMG_0462-scaled.jpg 1920w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-2-IMG_0462-225x300.jpg 225w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-2-IMG_0462-768x1024.jpg 768w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-2-IMG_0462-1152x1536.jpg 1152w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-2-IMG_0462-1536x2048.jpg 1536w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-2-IMG_0462-696x928.jpg 696w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-2-IMG_0462-1068x1424.jpg 1068w\" sizes=\"auto, (max-width: 1920px) 100vw, 1920px\" \/><figcaption id=\"caption-attachment-2691\" class=\"wp-caption-text\"><span style=\"font-size: 16px;\">N\u1ed1i \u0111\u1ea5t thi\u1ebft b\u1ecb \u0111i\u1ec7n<\/span><\/figcaption><\/figure>\n<h3 style=\"text-align: justify;\"><strong>2.2. N\u1ed1i thi\u1ebft b\u1ecb \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n \u00e1p l\u1edbn h\u01a1n 1000V trong m\u1ea1ng \u0111i\u1ec7n trung t\u00ednh c\u00e1ch ly theo TCVN 4756:1989<\/strong><\/h3>\n<p style=\"text-align: justify;\">2.2.1. Theo TCVN 4756:1989, \u0111i\u1ec7n tr\u1edf n\u1ed1i \u0111\u1ea5t c\u00f3 \u0111i\u1ec7n \u00e1p l\u1edbn h\u01a1n 1000V trong m\u1ea1ng \u0111i\u1ec7n trung t\u00ednh c\u00e1ch ly c\u00f3 th\u00eam \u0111i\u1ec7n tr\u1edf n\u1ed1i \u0111\u1ea5t t\u1ef1 nhi\u00ean \u1edf m\u1ecdi kho\u1ea3ng th\u1eddi gian trong n\u0103m, khi c\u00f3 d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch ch\u1ea1m \u0111\u1ea5t ch\u1ea1y qua kh\u00f4ng \u0111\u01b0\u1ee3c v\u01b0\u1ee3t qu\u00e1:<\/p>\n<ul style=\"text-align: justify;\">\n<li>Trong tr\u01b0\u1eddng h\u1ee3p trang b\u1ecb n\u1ed1i \u0111\u1ea5t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho thi\u1ebft b\u1ecb \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n \u00e1p \u0111\u1ebfn 1000V.<\/li>\n<\/ul>\n<p style=\"text-align: center;\">R=250I,<\/p>\n<p style=\"text-align: justify;\">Tr\u01b0\u1eddng h\u1ee3p n\u00e0y v\u1eabn c\u1ea7n th\u1ef1c hi\u1ec7n c\u00e1c y\u00eau c\u1ea7u v\u1ec1 n\u1ed1i \u0111\u1ea5t cho c\u00e1c thi\u1ebft b\u1ecb c\u00f3 \u0111i\u1ec7n \u00e1p \u0111\u1ebfn 1000V.<\/p>\n<ul style=\"text-align: justify;\">\n<li>Trong tr\u01b0\u1eddng h\u1ee3p n\u1ed1i \u0111\u1ea5t ch\u1ec9 s\u1eed d\u1ee5ng cho thi\u1ebft b\u1ecb \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n \u00e1p l\u1edbn h\u01a1n 1000V.<\/li>\n<\/ul>\n<p style=\"text-align: center;\">\u00a0R=250I,<\/p>\n<p style=\"text-align: justify;\">Trong \u0111\u00f3:<\/p>\n<ul style=\"text-align: justify;\">\n<li>R l\u00e0 \u0111i\u1ec7n tr\u1edf l\u1edbn nh\u1ea5t c\u1ee7a n\u1ed1i \u0111\u1ea5t<\/li>\n<li>I l\u00e0 d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">2.2.2. C\u00e1ch t\u00ednh to\u00e1n d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch theo TCVN 4756:1989 nh\u01b0 sau:<\/p>\n<ul style=\"text-align: justify;\">\n<li>Trong m\u1ea1ng \u0111i\u1ec7n kh\u00f4ng c\u00f3 b\u00f9 d\u00f2ng \u0111i\u1ec7n \u0111i\u1ec7n dung th\u00ec d\u00f2ng \u0111i\u1ec7n t\u00ednh to\u00e1n s\u1ebd l\u00e0 d\u00f2ng \u0111i\u1ec7n t\u1ed5ng ng\u1eafn m\u1ea1ch ch\u1ea1m \u0111\u1ea5t.<\/li>\n<li>Trong m\u1ea1ng \u0111i\u1ec7n \u0111\u01b0\u1ee3c b\u00f9 d\u00f2ng \u0111i\u1ec7n \u0111i\u1ec7n dung:\n<ul>\n<li>\u0110\u1ed1i v\u1edbi thi\u1ebft b\u1ecb b\u00f9 \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi trang b\u1ecb n\u1ed1i \u0111\u1ea5t th\u00ec d\u00f2ng \u0111i\u1ec7n t\u00ednh to\u00e1n s\u1ebd b\u1eb1ng 125% d\u00f2ng \u0111i\u1ec7n danh \u0111\u1ecbnh c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb b\u00f9 \u0111\u00f3 theo TCVN 4756:1989.<\/li>\n<li>\u0110\u1ed1i v\u1edbi c\u00e1c thi\u1ebft b\u1ecb b\u00f9 kh\u00f4ng n\u1ed1i v\u1edbi trang b\u1ecb n\u1ed1i \u0111\u1ea5t th\u00ec d\u00f2ng \u0111i\u1ec7n t\u00ednh to\u00e1n s\u1ebd l\u00e0 d\u00f2ng \u0111i\u1ec7n d\u01b0 c\u1ee7a d\u00f2ng ng\u1eafn m\u1ea1ch ch\u1ea1m \u0111\u1ea5t, khi c\u1eaft ph\u1ea7n m\u1ea1ng \u0111i\u1ec7n r\u1ebd nh\u00e1nh ho\u1eb7c c\u1eaft thi\u1ebft b\u1ecb b\u00f9 c\u00f3 c\u00f4ng su\u1ea5t l\u1edbn nh\u1ea5t trong s\u1ed1 c\u00e1c thi\u1ebft b\u1ecb b\u00f9 theo TCVN 4756:1989.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">Theo TCVN 4756:1989, d\u00f2ng \u0111i\u1ec7n t\u00ednh to\u00e1n c\u00f3 th\u1ec3 l\u1ea5y b\u1eb1ng d\u00f2ng \u0111i\u1ec7n t\u00e1c \u0111\u1ed9ng c\u1ee7a r\u01a1le b\u1ea3o v\u1ec7 ng\u1eafn m\u1ea1ch gi\u1eefa c\u00e1c pha, ng\u1eafn m\u1ea1ch ch\u1ea1m \u0111\u1ea5t m\u1ed9t pha ho\u1eb7c d\u00f2ng \u0111i\u1ec7n ch\u1ea3y c\u1ee7a c\u1ea7u ch\u1ea3y. Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch ch\u1ea1m \u0111\u1ea5t kh\u00f4ng \u0111\u01b0\u1ee3c nh\u1ecf h\u01a1n 1,5 l\u1ea7n so v\u1edbi d\u00f2ng \u0111i\u1ec7n t\u00e1c \u0111\u1ed9ng c\u1ee7a r\u01a1le b\u1ea3o v\u1ec7 ho\u1eb7c kh\u00f4ng \u0111\u01b0\u1ee3c nh\u1ecf h\u01a1n 3 l\u1ea7n d\u00f2ng \u0111i\u1ec7n danh \u0111\u1ecbnh c\u1ee7a c\u1ea7u ch\u1ea3y.<\/p>\n<p style=\"text-align: justify;\">Khi d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch c\u00f3 tr\u1ecb s\u1ed1 l\u1edbn nh\u1ea5t, d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch ch\u1ea1m \u0111\u1ea5t \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh theo s\u01a1 \u0111\u1ed3 v\u1eadn h\u00e0nh l\u01b0\u1edbi \u0111i\u1ec7n trong TCVN 4756:1989.<\/p>\n<p style=\"text-align: justify;\">2.2.3. Trong ti\u00eau chu\u1ea9n TCVN 4756:1989, \u0111\u1ed1i v\u1edbi c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n \u0111\u1ec3 h\u1edf c\u00f3 ch\u1ec9 s\u1ed1 \u0111i\u1ec7n \u00e1p l\u1edbn h\u01a1n 1000V trong m\u1ea1ng \u0111i\u1ec7n trung t\u00ednh c\u00e1ch ly c\u1ea7n ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u1eb7t n\u1ed1i \u0111\u1ea5t th\u00e0nh m\u1ed9t v\u00f2ng xung quanh \u0111i\u1ec7n t\u00edch \u1edf \u0111\u1ed9 s\u00e2u t\u1ed1i thi\u1ec3u 0,5m v\u00e0 m\u1ea1ch v\u00f2ng n\u00e0y \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi thi\u1ebft b\u1ecb c\u1ea7n n\u1ed1i \u0111\u1ea5t.<\/p>\n<p style=\"text-align: justify;\">Khi \u0111\u1ea5t c\u00f3 \u0111i\u1ec7n tr\u1edf su\u1ea5t l\u1edbn h\u01a1n 500m, ph\u1ea3i \u0111\u1eb7t th\u00eam c\u00e1c \u0111i\u1ec7n c\u1ef1c n\u1ed1i \u0111\u1ea5t d\u1ecdc theo c\u00e1c d\u00e3y thi\u1ebft b\u1ecb v\u1ec1 ph\u00eda \u0111i l\u1ea1i v\u1eadn h\u00e0nh \u1edf \u0111\u1ed9 s\u00e2u 0,5m n\u1ebfu \u0111i\u1ec7n tr\u1edf c\u1ee7a trang b\u1ecb n\u1ed1i \u0111\u1ea5t l\u1edbn h\u01a1n 10m v\u00e0 c\u00e1ch b\u1ec7 \u0111\u1eb7t thi\u1ebft b\u1ecb ho\u1eb7c t\u00e1ch m\u00f3ng 0,8 \u0111\u1ebfn 1,0m theo y\u00eau c\u1ea7u c\u1ee7a TCVN 4756:1989.<\/p>\n<figure id=\"attachment_2692\" aria-describedby=\"caption-attachment-2692\" style=\"width: 2560px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2692\" src=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-3-IMG_0551-scaled.jpg\" alt=\"L\u1eafp \u0111\u1eb7t thang m\u00e1ng c\u00e1p \u0111\u1ee1 d\u00e2y c\u00e1p \u0111i\u1ec7n\" width=\"2560\" height=\"1920\" srcset=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-3-IMG_0551-scaled.jpg 2560w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-3-IMG_0551-300x225.jpg 300w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-3-IMG_0551-1024x768.jpg 1024w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-3-IMG_0551-768x576.jpg 768w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-3-IMG_0551-1536x1152.jpg 1536w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-3-IMG_0551-2048x1536.jpg 2048w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-3-IMG_0551-696x522.jpg 696w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-3-IMG_0551-1068x801.jpg 1068w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-3-IMG_0551-1920x1440.jpg 1920w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-2692\" class=\"wp-caption-text\"><span style=\"font-size: 16px;\">L\u1eafp \u0111\u1eb7t thang m\u00e1ng c\u00e1p \u0111\u1ee1 d\u00e2y c\u00e1p \u0111i\u1ec7n<\/span><\/figcaption><\/figure>\n<h3 style=\"text-align: justify;\"><strong>2.3. N\u1ed1i thi\u1ebft b\u1ecb \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n \u00e1p l\u1edbn h\u01a1n 1000V trong m\u1ea1ng \u0111i\u1ec7n trung t\u00ednh tr\u1ef1c ti\u1ebfp theo TCVN 4756:1989<\/strong><\/h3>\n<p style=\"text-align: justify;\">2.3.1. \u0110i\u1ec3m trung t\u00ednh c\u1ee7a m\u00e1y bi\u1ebfn \u00e1p, m\u00e1y ph\u00e1t v\u1ec1 ph\u00eda \u0111i\u1ec7n \u00e1p \u0111\u1ebfn 1000V c\u1ea7n \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi c\u1ef1c n\u1ed1i \u0111\u1ea5t b\u1eb1ng d\u00e2y n\u1ed1i \u0111\u1ea5t.<\/p>\n<p style=\"text-align: justify;\">Ti\u00eau chu\u1ea9n TCVN 4756:1989 kh\u00f4ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng d\u00e2y kh\u00f4ng l\u00e0m vi\u1ec7c \u0111i t\u1eeb \u0111i\u1ec3m trung t\u00ednh \u0111\u1ebfn b\u1ea3ng l\u1eafp thi\u1ebft b\u1ecb ph\u00e2n ph\u1ed1i l\u00e0m d\u00e2y n\u1ed1i \u0111\u1ea5t c\u1ee7a m\u00e1y ph\u00e1t ho\u1eb7c m\u00e1y bi\u1ebfn \u00e1p. V\u00e0 ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u1eb7t tr\u1ef1c ti\u1ebfp c\u00e1c c\u1ee5c n\u1ed1i \u0111\u1ea5t \u1edf g\u1ea7n m\u00e1y. Trong tr\u01b0\u1eddng h\u1ee3p kh\u00e1c (v\u00ed d\u1ee5 \u1edf c\u00e1c tr\u1ea1m trong ph\u00e2n x\u01b0\u1edfng) th\u00ec \u0111\u01b0\u1ee3c ph\u00e9p \u0111\u1eb7t c\u1ef1c n\u1ed1i \u0111\u1ea5t c\u1ea1nh t\u01b0\u1eddng nh\u00e0.<\/p>\n<p style=\"text-align: justify;\">2.3.2. Theo TCVN 4756:1989, \u0111i\u1ec7n tr\u1edf c\u1ee7a trang b\u1ecb n\u1ed1i \u0111\u1ea5t n\u1ed1i v\u1edbi \u0111i\u1ec3m trung t\u00ednh c\u1ee7a m\u00e1y bi\u1ebfn \u00e1p ho\u1eb7c m\u00e1y ph\u00e1t hay \u0111\u1ea7u ra c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n m\u1ed9t pha \u1edf b\u1ea5t k\u1ef3 m\u1ecdi th\u1eddi \u0111i\u1ec3m trong n\u0103m kh\u00f4ng \u0111\u01b0\u1ee3c v\u01b0\u1ee3t qu\u00e1 2:, 4: v\u00e0 8:, t\u01b0\u01a1ng \u1ee9ng v\u1edbi 380V, 220V v\u00e0 127V. \u0110\u1ed1i v\u1edbi ngu\u1ed3n \u0111i\u1ec7n m\u1ed9t pha ho\u1eb7c 660V, 380V v\u00e0 220V \u0111\u1ed1i v\u1edbi ngu\u1ed3n \u0111i\u1ec7n ba pha. Gi\u00e1 tr\u1ecb n\u00e0y cho ph\u00e9p t\u00ednh \u0111\u1ebfn c\u1ea3 n\u1ed1i \u0111\u1ea5t t\u1ef1 nhi\u00ean c\u0169ng nh\u01b0 n\u1ed1i \u0111\u1ea5t l\u1eb7p l\u1ea1i cho d\u00e2y kh\u00f4ng c\u1ee7a \u0111\u01b0\u1eddng d\u00e2y t\u1ea3i \u0111i\u1ec7n tr\u00ean kh\u00f4ng v\u1edbi \u0111i\u1ec7n \u00e1p l\u00ean \u0111\u1ebfn 1000V, v\u00e0 s\u1ed1 \u0111\u01b0\u1eddng d\u00e2y \u0111i ra kh\u00f4ng nh\u1ecf h\u01a1n hai.<\/p>\n<p style=\"text-align: justify;\">TCVN 4756:1989 cho ph\u00e9p khi c\u00f3 \u0111i\u1ec7n tr\u1edf c\u1ee7a trang b\u1ecb n\u1ed1i \u0111\u1ea5t \u0111\u01b0\u1ee3c \u0111\u1eb7t ngay b\u00ean c\u1ea1nh ho\u1eb7c d\u01b0\u1edbi m\u00e1y bi\u1ebfn \u00e1p, m\u00e1y ph\u00e1t ho\u1eb7c \u0111\u1ea7u ra c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n m\u1ed9t pha th\u00ec kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n 15:, 30: v\u00e0 60:, t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi \u0111i\u1ec7n \u00e1p 660V, 380V v\u00e0 220V. \u0110\u1ed1i v\u1edbi ngu\u1ed3n \u0111i\u1ec7n ba pha l\u00e0 380V, 220V v\u00e0 127V \u0111\u1ed1i v\u1edbi ngu\u1ed3n \u0111i\u1ec7n m\u1ed9t pha. Khi \u0111i\u1ec7n tr\u1edf su\u1ea5t c\u1ee7a \u0111\u1ea5t l\u1edbn h\u01a1n 100\u03a9m, c\u00f3 th\u1ec3 t\u0103ng \u0111i\u1ec7n tr\u1edf n\u1ed1i \u0111\u1ea5t quy \u0111\u1ecbnh \u0111\u1ebfn 0,01r l\u1ea7n, nh\u01b0ng kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n m\u01b0\u1eddi l\u1ea7n.<\/p>\n<h3 style=\"text-align: justify;\"><strong>2.4. N\u1ed1i thi\u1ebft b\u1ecb \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n \u00e1p b\u1eb1ng 1000V trong m\u1ea1ng \u0111i\u1ec7n trung t\u00ednh c\u00e1ch ly theo TCVN 4756:1989<\/strong><\/h3>\n<p style=\"text-align: justify;\">2.4.1. \u0110i\u1ec7n tr\u1edf c\u1ee7a trang b\u1ecb n\u1ed1i \u0111\u1ea5t d\u00f9ng \u0111\u1ec3 n\u1ed1i \u0111\u1ea5t thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1ed1i \u0111a l\u00e0 4\u03a9<\/p>\n<p style=\"text-align: justify;\">Theo TCVN 4756:1989, trong tr\u01b0\u1eddng h\u1ee3p c\u00f4ng su\u1ea5t c\u1ee7a m\u00e1y bi\u1ebfn \u00e1p ho\u1eb7c m\u00e1y ph\u00e1t l\u00e0 100kVA ho\u1eb7c nh\u1ecf h\u01a1n th\u00ec \u0111i\u1ec7n tr\u1edf c\u1ee7a trang b\u1ecb n\u1ed1i \u0111\u1ea5t \u0111\u01b0\u1ee3c ph\u00e9p kh\u00f4ng l\u1edbn h\u01a1n 10:. N\u1ebfu m\u00e1y bi\u1ebfn \u00e1p ho\u1eb7c m\u00e1y ph\u00e1t l\u00e0m vi\u1ec7c song song th\u00ec \u0111i\u1ec7n tr\u1edf cho ph\u00e9p l\u00e0 10: khi t\u1ed5ng c\u00f4ng su\u1ea5t c\u1ee7a ch\u00fang t\u1ed1i \u0111a l\u00e0 100kVA.<\/p>\n<h3 style=\"text-align: justify;\"><strong>2.5. N\u1ed1i thi\u1ebft b\u1ecb \u0111i\u1ec7n \u1edf v\u00f9ng c\u00f3 \u0111i\u1ec7n tr\u1edf th\u1ea5p theo TCVN 4756:1989<\/strong><\/h3>\n<p style=\"text-align: justify;\">2.5.1. Ti\u00eau chu\u1ea9n TCVN 4756:1989 cho ph\u00e9p trang b\u1ecb n\u1ed1i \u0111\u1ea5t c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n \u00e1p l\u1edbn h\u01a1n 1000V trong m\u1ea1ng c\u00f3 \u0111i\u1ec3m trung t\u00ednh n\u1ed1i \u0111\u1ea5t hi\u1ec7u qu\u1ea3, t\u1ea1i nh\u1eefng n\u01a1i c\u00f3 \u0111i\u1ec7n tr\u1edf su\u1ea5t l\u1edbn cho ph\u00e9p th\u1ef1c hi\u1ec7n theo y\u00eau c\u1ea7u \u0111\u1ed1i v\u1edbi \u0111i\u1ec7n \u00e1p ch\u1ea1m.<\/p>\n<p style=\"text-align: justify;\">Trong TCVN 4756:1989, c\u00e1c v\u00f9ng \u0111\u1ea5t c\u00f3 \u0111\u00e1 th\u00ec \u0111\u01b0\u1ee3c ph\u00e9p \u0111\u1eb7t c\u00e1c \u0111i\u1ec7n c\u1ef1c n\u1ed1i \u0111\u1ea5t n\u00f4ng h\u01a1n so v\u1edbi y\u00eau c\u1ea7u, tuy nhi\u00ean kh\u00f4ng \u0111\u01b0\u1ee3c nh\u1ecf h\u01a1n 0,15m. B\u00ean c\u1ea1nh \u0111\u00f3, kh\u00f4ng c\u1ea7n b\u1ed1 tr\u00ed c\u00e1c c\u1ecdc n\u1ed1i \u0111\u1ea5t \u1edf c\u1eeda ra v\u00e0o.<\/p>\n<p style=\"text-align: justify;\">2.5.2. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p c\u1ea7n th\u1ef1c hi\u1ec7n khi l\u1eafp \u0111\u1eb7t c\u1ef1c n\u1ed1i \u0111\u1ea5t nh\u00e2n t\u1ea1o \u1edf c\u00e1c v\u00f9ng \u0111\u1ea5t c\u00f3 \u0111i\u1ec7n tr\u1edf su\u1ea5t l\u1edbn theo TCVN 4756:1989 \u0111\u00f3 l\u00e0:<\/p>\n<ul style=\"text-align: justify;\">\n<li>N\u1ebfu nh\u01b0 \u0111i\u1ec7n tr\u1edf su\u1ea5t c\u1ee7a \u0111\u1ea5t gi\u1ea3m theo \u0111\u1ed9 s\u00e2u th\u00ec c\u1ea7n t\u0103ng chi\u1ec1u d\u00e0i c\u1ecdc n\u1ed1i \u0111\u1ea5t<\/li>\n<li>N\u1ebfu xung quanh \u0111\u00f3 (b\u00e1n k\u00ednh 2km) ch\u1ed7 \u0111\u1ea5t c\u00f3 \u0111i\u1ec7n tr\u1edf su\u1ea5t nh\u1ecf h\u01a1n th\u00ec c\u1ea7n \u0111\u1eb7t c\u00e1c c\u1ef1c n\u1ed1i \u0111\u1ea5t \u1edf xa<\/li>\n<li>Gi\u1ea3m \u0111i\u1ec7n tr\u1edf su\u1ea5t c\u1ee7a \u0111\u1ea5t b\u1eb1ng c\u00e1ch c\u1ea3i t\u1ea1o \u0111\u1ea5t b\u1eb1ng c\u00e1ch d\u00f9ng b\u1ed9t bentonite, b\u1ed9t s\u00e9t, ho\u1eb7c than ch\u00ec,&#8230; tr\u1ed9n v\u1edbi c\u00e1c ch\u1ea5t ph\u1ee5 gia kh\u00e1c<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">2.5.3. TCVN 4756:1989 cho ph\u00e9p t\u0103ng gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf c\u1ee7a trang b\u1ecb n\u1ed1i \u0111\u1ea5t n\u00e0y l\u00ean 0,002r l\u1ea7n nh\u01b0ng kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p qu\u00e1 10 l\u1ea7n khi \u0111\u1ea5t c\u00f3 \u0111i\u1ec7n tr\u1edf su\u1ea5t t\u1ed1i thi\u1ec3u 500:m. \u0110\u1ed1i v\u1edbi c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n \u00e1p l\u1edbn h\u01a1n 1000V v\u00e0 c\u00f3 trung t\u00ednh c\u00e1ch ly \u0111\u1ed1i v\u1edbi c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n \u00e1p \u0111\u1ebfn 1000V. N\u1ebfu th\u1ef1c hi\u1ec7n c\u00e1c bi\u1ec7n ph\u00e1p \u1edf \u0111i\u1ec1u 2.5.2 c\u1ee7a TCVN 4756:1989 c\u00f3 chi ph\u00ed qu\u00e1 cao.<\/p>\n<h2 style=\"text-align: justify;\"><strong>3. N\u1ed1i &#8220;kh\u00f4ng&#8221; c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n theo TCVN 4756:1989<\/strong><\/h2>\n<p style=\"text-align: justify;\">3.1. C\u00e1c b\u1ed9 ph\u1eadn kim lo\u1ea1i c\u1ee7a thi\u1ebft b\u1ecb \u0111i\u1ec7n \u0111\u01b0\u1ee3c d\u1eabn ra \u1edf \u0111i\u1ec1u 15 trong ti\u00eau chu\u1ea9n TCVN 4756:1989, khi n\u1ed1i &#8220;kh\u00f4ng&#8221; c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n ph\u1ea3i \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi d\u00e2y &#8220;kh\u00f4ng&#8221; b\u1ea3o v\u1ec7 (ho\u1eb7c m\u1ea1ch v\u00f2ng n\u1ed1i &#8220;kh\u00f4ng&#8221;) d\u1eabn t\u1eeb \u0111\u1ea7u ra \u0111\u01b0\u1ee3c n\u1ed1i \u0111\u1ea5t (\u0111\u1ed1i v\u1edbi ngu\u1ed3n m\u1ed9t pha) ho\u1eb7c t\u1eeb \u0111i\u1ec3m trung t\u00ednh m\u00e1y ph\u00e1t hay m\u00e1y bi\u1ebfn \u00e1p (\u0111\u1ed1i v\u1edbi m\u1ea1ng \u0111i\u1ec7n xoay chi\u1ec1u ba pha), ho\u1eb7c t\u1eeb \u0111i\u1ec3m gi\u1eefa \u0111\u01b0\u1ee3c n\u1ed1i \u0111\u1ea5t (\u0111\u1ed1i v\u1edbi m\u1ea1ng \u0111i\u1ec7n m\u1ed9t chi\u1ec1u).<\/p>\n<p style=\"text-align: justify;\">3.2. Theo TCVN 4756:1989, \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ng\u1eaft t\u1ef1 \u0111\u1ed9ng ph\u1ea7n b\u1ecb s\u1ef1 c\u1ed1 khi n\u1ed1i &#8220;kh\u00f4ng&#8221; thi\u1ebft b\u1ecb \u0111i\u1ec7n th\u00ec \u0111i\u1ec7n d\u1eabn c\u1ee7a d\u00e2y &#8220;kh\u00f4ng&#8221; v\u00e0 d\u00e2y pha b\u1ea3o v\u1ec7 c\u1ea7n \u0111\u1ea3m b\u1ea3o khi c\u00f3 ch\u1ea1m v\u1ecf ho\u1eb7c ch\u1ea1m ra \u0111\u00e2y &#8220;kh\u00f4ng&#8221; b\u1ea3o v\u1ec7, d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch kh\u00f4ng \u0111\u01b0\u1ee3c nh\u1ecf h\u01a1n:<\/p>\n<ul style=\"text-align: justify;\">\n<li>Ba l\u1ea7n so v\u1edbi d\u00f2ng ch\u1ec9nh \u0111\u1ecbnh c\u1ee7a b\u1ed9 ph\u1eadn ng\u1eaft c\u00f3 \u0111i\u1ec1u ch\u1ec9nh ho\u1eb7c d\u00f2ng \u0111i\u1ec7n danh \u0111\u1ecbnh c\u1ee7a b\u1ed9 ph\u1eadn ng\u1eaft kh\u00f4ng \u0111i\u1ec1u ch\u1ec9nh c\u1ee7a aptomat c\u00f3 \u0111\u1eb7c t\u00ednh d\u00f2ng \u0111i\u1ec7n \u0111\u01b0\u1ee3c.<\/li>\n<li>Ba l\u1ea7n d\u00f2ng \u0111i\u1ec7n danh \u0111\u1ecbnh \u1edf c\u1ea7u ch\u1ea3y g\u1ea7n nh\u1ea5t c\u1ee7a d\u00e2y ch\u1ea3y<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">D\u00e2y &#8220;kh\u00f4ng&#8221; b\u1ea3o v\u1ec7 c\u00f3 \u0111i\u1ec7n d\u1eabn to\u00e0n ph\u1ea7n trong t\u1ea5t c\u1ea3 c\u00e1c tr\u01b0\u1eddng h\u1ee3p kh\u00f4ng \u0111\u01b0\u1ee3c nh\u1ecf h\u01a1n 50% so v\u1edbi \u0111i\u1ec7n d\u1eabn c\u1ee7a d\u00e2y pha theo TCVN 4756:1989.<\/p>\n<p style=\"text-align: justify;\">3.3. Khi t\u00ednh to\u00e1n l\u1ef1a ch\u1ecdn d\u00f2ng ch\u1ec9nh \u0111\u1ecbnh ho\u1eb7c d\u00e2y ch\u1ea3y c\u1ee7a aptomat b\u1ea3o v\u1ec7 c\u00e1c \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n trong ti\u00eau chu\u1ea9n TCVN 4756:1989 c\u1ea7n ph\u1ea3i x\u00e9t \u0111\u1ebfn \u1ea3nh h\u01b0\u1edfng c\u1ee7a t\u1ed5ng tr\u1edf m\u1ea1ng \u0111i\u1ec7n so v\u1edbi \u0111i\u1ec1u ki\u1ec7n kh\u1edfi \u0111\u1ed9ng c\u1ee7a \u0111\u1ed9ng c\u01a1 nh\u1eb1m t\u0103ng \u0111\u1ed9 nh\u1ea1y c\u1ee7a thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7.<\/p>\n<p style=\"text-align: justify;\">3.4. Theo TCVN 4756:1989, khi n\u1ed1i &#8220;kh\u00f4ng&#8221; cho c\u00e1c thi\u1ebft b\u1ecb v\u00e0 b\u1ed9 ph\u1eadn tr\u00ean \u0111\u01b0\u1eddng d\u00e2y t\u1ea3i \u0111i\u1ec7n tr\u00ean kh\u00f4ng th\u00ec ph\u1ea3i l\u1eafp tr\u00ean c\u00f9ng c\u1ed9t \u0111i\u1ec7n d\u00e2y \u201ckh\u00f4ng\u201d v\u1edbi d\u00e2y pha.<\/p>\n<figure id=\"attachment_2693\" aria-describedby=\"caption-attachment-2693\" style=\"width: 2560px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2693\" src=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-4-IMG_0473-scaled.jpg\" alt=\"H\u1ec7 th\u1ed1ng t\u1ee7 b\u1ea3ng \u0111i\u1ec7n\" width=\"2560\" height=\"1920\" srcset=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-4-IMG_0473-scaled.jpg 2560w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-4-IMG_0473-300x225.jpg 300w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-4-IMG_0473-1024x768.jpg 1024w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-4-IMG_0473-768x576.jpg 768w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-4-IMG_0473-1536x1152.jpg 1536w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-4-IMG_0473-2048x1536.jpg 2048w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-4-IMG_0473-696x522.jpg 696w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-4-IMG_0473-1068x801.jpg 1068w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-4-IMG_0473-1920x1440.jpg 1920w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-2693\" class=\"wp-caption-text\"><span style=\"font-size: 16px;\">H\u1ec7 th\u1ed1ng t\u1ee7 b\u1ea3ng \u0111i\u1ec7n<\/span><\/figcaption><\/figure>\n<h2 style=\"text-align: justify;\"><strong>4. Trang b\u1ecb n\u1ed1i \u0111\u1ea5t v\u00e0 n\u1ed1i kh\u00f4ng theo TCVN 4756:1989<\/strong><\/h2>\n<h3 style=\"text-align: justify;\"><strong>4.1. \u0110i\u1ec7n c\u1ef1c n\u1ed1i \u0111\u1ea5t theo TCVN 4756:1989<\/strong><\/h3>\n<p style=\"text-align: justify;\">4.1.1. Nh\u1eefng b\u1ed9 ph\u1eadn \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 l\u00e0m n\u1ed1i \u0111\u1ea5t t\u1ef1 nhi\u00ean theo TCVN 4756:1989 bao g\u1ed3m:<\/p>\n<ul style=\"text-align: justify;\">\n<li>C\u00e1c \u1ed1ng d\u1eabn n\u01b0\u1edbc v\u00e0 c\u00e1c \u1ed1ng d\u1eabn b\u1eb1ng kim lo\u1ea1i kh\u00e1c \u0111\u01b0\u1ee3c \u0111\u1eb7t d\u01b0\u1edbi \u0111\u1ea5t, tr\u1eeb c\u00e1c \u0111\u01b0\u1eddng \u1ed1ng d\u1eabn c\u00e1c ch\u1ea5t kh\u00ed, ch\u1ea5t l\u1ecfng d\u1ec5 ch\u00e1y v\u00e0 h\u1ee3p ch\u1ea5t ch\u00e1y, n\u1ed5<\/li>\n<li>C\u00e1c \u1ed1ng ch\u00f4n b\u00ean trong \u0111\u1ea5t c\u1ee7a gi\u1ebfng khoan<\/li>\n<li>C\u00e1c k\u1ebft c\u1ea5u b\u00ea t\u00f4ng c\u1ed1t th\u00e9p, kim lo\u1ea1i n\u1eb1m d\u01b0\u1edbi \u0111\u1ea5t c\u1ee7a nh\u00e0 v\u00e0 c\u00f4ng tr\u00ecnh x\u00e2y d\u1ef1ng<\/li>\n<li>C\u00e1c \u0111\u01b0\u1eddng \u1ed1ng kim lo\u1ea1i trong c\u00f4ng tr\u00ecnh th\u1ee7y l\u1ee3i<\/li>\n<li>V\u1ecf b\u1ecdc ch\u00ec c\u1ee7a d\u00e2y c\u00e1p \u0111\u01b0\u1ee3c \u0111\u1eb7t trong \u0111\u1ea5t. Kh\u00f4ng \u0111\u01b0\u1ee3c d\u00f9ng v\u1ecf nh\u00f4m c\u1ee7a d\u00e2y c\u00e1p \u0111\u1ec3 l\u00e0m c\u1ef1c n\u1ed1i \u0111\u1ea5t t\u1ef1 nhi\u00ean. Khi c\u00f3 tr\u00ean hai \u0111\u01b0\u1eddng c\u00e1p th\u00ec \u0111\u01b0\u1ee3c ph\u00e9p d\u00f9ng v\u1ecf c\u00e1p l\u00e0m n\u1ed1i \u0111\u1ea5t duy nh\u1ea5t.<\/li>\n<li>\u0110\u01b0\u1eddng d\u00e2y t\u1ea3i \u0111i\u1ec7n c\u1ee7a d\u00e2y tr\u00ean kh\u00f4ng v\u1edbi \u0111i\u1ec7n \u00e1p \u0111\u1ebfn 1000V c\u00f3 n\u1ed1i \u0111\u1ea5t l\u1eb7p l\u1ea1i khi s\u1ed1 \u0111\u01b0\u1eddng d\u00e2y t\u1ed1i thi\u1ec3u l\u00e0 hai<\/li>\n<li>\u0110\u01b0\u1eddng ray c\u1ee7a c\u1ea7n tr\u1ee5c, \u0111\u01b0\u1eddng ray c\u1ee7a \u0111\u01b0\u1eddng s\u1eaft tr\u1ee5c kh\u00f4ng \u0111i\u1ec7n kh\u00ed h\u00f3a, \u0111\u01b0\u1eddng ray n\u1ed9i b\u1ed9 x\u00ed nghi\u1ec7p, n\u1ebfu nh\u01b0 gi\u1eefa c\u00e1c th\u00e0nh ray s\u1eed d\u1ee5ng c\u1ea7u n\u1ed1i \u0111\u1ec3 n\u1ed1i v\u1edbi nhau.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">4.1.2. Trong ti\u00eau chu\u1ea9n TCVN 4756:1989, tr\u1ee5c n\u1ed1i \u0111\u1ea5t ph\u1ea3i \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi c\u00e1c c\u1ee5m n\u1ed1i \u0111\u1ea5t \u00edt nh\u1ea5t \u1edf hai ch\u1ed7 kh\u00e1c nhau. Y\u00eau c\u1ea7u n\u00e0y kh\u00f4ng \u00e1p d\u1ee5ng \u0111\u1ed1i v\u1edbi v\u1ecf kim lo\u1ea1i c\u1ee7a c\u00e1p v\u00e0 c\u1ed9t \u0111i\u1ec7n c\u1ee7a \u0111\u01b0\u1eddng d\u00e2y t\u1ea3i \u0111i\u1ec7n tr\u00ean kh\u00f4ng.<\/p>\n<p style=\"text-align: justify;\">4.1.3. \u0110\u1ec3 l\u00e0m \u0111i\u1ec7n c\u1ef1c n\u1ed1i \u0111\u1ea5t nh\u00e2n t\u1ea1o n\u00ean s\u1eed d\u1ee5ng th\u00e9p. Kh\u00f4ng \u0111\u01b0\u1ee3c s\u01a1n c\u00e1c \u0111i\u1ec7n c\u1ef1c n\u1ed1i \u0111\u1ea5t nh\u00e2n t\u1ea1o.<\/p>\n<p style=\"text-align: justify;\">Theo TCVN 4756:1989, \u0111i\u1ec7n c\u1ef1c n\u1ed1i \u0111\u1ea5t nh\u00e2n t\u1ea1o b\u1eb1ng th\u00e9p c\u00f3 k\u00edch th\u01b0\u1edbc nh\u1ecf nh\u1ea5t nh\u01b0 sau:<\/p>\n<ul style=\"text-align: justify;\">\n<li>\u0110\u01b0\u1eddng k\u00ednh c\u1ef1c n\u1ed1i \u0111\u1ea5t tr\u00f2n (mm):<\/li>\n<li>Kh\u00f4ng m\u1ea1 k\u1ebdm: 10<\/li>\n<li>M\u1ea1 k\u1ebdm: 6<\/li>\n<li>Ti\u1ebft di\u1ec7n c\u1ef1c n\u1ed1i \u0111\u1ea5t ch\u1eef nh\u1eadt (mm2): 48<\/li>\n<li>\u00a0B\u1ec1 d\u00e0y c\u1ef1c n\u1ed1i \u0111\u1ea5t ch\u1eef nh\u1eadt v\u00e0 b\u1ec1 d\u00e0y th\u00e9p g\u00f3c, mm: 4<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">Thi\u1ebft b\u1ecb \u0111i\u1ec7n c\u00f3 ti\u1ebft di\u1ec7n c\u1ee7a \u0111i\u1ec7n c\u1ef1c n\u1ed1i \u0111\u1ea5t n\u1eb1m ngang c\u00f3 \u0111i\u1ec7n \u00e1p l\u1edbn h\u01a1n 1000V \u0111\u01b0\u1ee3c ch\u1ecdn theo \u0111\u1ed9 b\u1ec1n v\u1ec1 nhi\u1ec7t. Kh\u00f4ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ho\u1eb7c b\u1ed1 tr\u00ed c\u00e1c \u0111i\u1ec7n c\u1ef1c n\u1ed1i \u0111\u1ea5t \u1edf nh\u1eefng n\u01a1i \u0111\u1ea5t b\u1ecb kh\u00f4 do t\u00e1c d\u1ee5ng c\u1ee7a nhi\u1ec7t to\u1ea3 ra \u1edf c\u00e1c \u0111\u01b0\u1eddng \u1ed1ng. V\u00e0 ph\u1ea3i l\u1ea5p \u0111\u1ea7y b\u1eb1ng \u0111\u1ea5t \u0111\u1ed3ng nh\u1ea5t \u0111\u1ed1i v\u1edbi h\u00e0o \u0111\u1eb7t \u0111i\u1ec7n c\u1ef1c n\u1ed1i \u0111\u1ea5t, lo\u1ea1i b\u1ecf ph\u1ebf li\u1ec7u x\u00e2y d\u1ef1ng v\u00e0 \u0111\u00e1 d\u0103m.<\/p>\n<p style=\"text-align: justify;\">Ngo\u00e0i ra, theo TCVN 4756:1989 ph\u1ea3i th\u1ef1c hi\u1ec7n m\u1ed9t trong nh\u1eefng bi\u1ec7n ph\u00e1p d\u01b0\u1edbi \u0111\u00e2y trong tr\u01b0\u1eddng h\u1ee3p \u0111i\u1ec7n c\u1ef1c n\u1ed1i \u0111\u1ea5t c\u00f3 nguy c\u01a1 b\u1ecb r\u1ec9:<\/p>\n<ul style=\"text-align: justify;\">\n<li>T\u0103ng ti\u1ebft di\u1ec7n c\u1ef1c n\u1ed1i \u0111\u1ea5t sao cho ph\u00f9 h\u1ee3p v\u1edbi th\u1eddi gian s\u1eed d\u1ee5ng c\u1ee7a n\u00f3<\/li>\n<li>D\u00f9ng c\u1ef1c n\u1ed1i \u0111\u1ea5t m\u1ea1 k\u1ebdm<\/li>\n<li>D\u00f9ng c\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o v\u1ec7 b\u1eb1ng \u0111i\u1ec7n<\/li>\n<li>D\u00f9ng \u0111i\u1ec7n c\u1ef1c n\u1ed1i \u0111\u1ea5t b\u1eb1ng b\u00ea t\u00f4ng \u0111\u1ec3 d\u1eabn \u0111i\u1ec7n l\u00e0m n\u1ed1i \u0111\u1ea5t nh\u00e2n t\u1ea1o<\/li>\n<\/ul>\n<h3 style=\"text-align: justify;\"><strong>4.2. D\u00e2y n\u1ed1i \u0111\u1ea5t v\u00e0 d\u00e2y kh\u00f4ng b\u1ea3o v\u1ec7 theo TCVN 4756:1989<\/strong><\/h3>\n<p style=\"text-align: justify;\">4.2.1. Theo TCVN 4756:1989, \u0111\u1ec3 l\u00e0m d\u00e2y &#8220;kh\u00f4ng&#8221; b\u1ea3o v\u1ec7 v\u00e0 d\u00e2y n\u1ed1i \u0111\u1ea5t c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng:<\/p>\n<ul style=\"text-align: justify;\">\n<li>D\u00e2y &#8220;kh\u00f4ng&#8221; l\u00e0m vi\u1ec7c<\/li>\n<li>C\u00e1c d\u00e2y d\u1eabn ch\u1ec9 \u0111\u01b0\u1ee3c d\u00f9ng ri\u00eang cho m\u1ee5c \u0111\u00edch n\u00e0y<\/li>\n<li>K\u1ebft c\u1ea5u kim lo\u1ea1i c\u1ee7a nh\u00e0 (c\u00e1c c\u1ed9t, x\u00e0,&#8230;)<\/li>\n<li>M\u00f3ng b\u1eb1ng b\u00ea t\u00f4ng c\u1ed1t th\u00e9p v\u00e0 c\u1ed1t th\u00e9p c\u1ee7a k\u1ebft c\u1ea5u x\u00e2y d\u1ef1ng<\/li>\n<li>K\u1ebft c\u1ea5u kim lo\u1ea1i c\u1ee7a c\u00e1c c\u00f4ng tr\u00ecnh c\u00f4ng ngh\u1ec7 (khung c\u1ee7a thi\u1ebft b\u1ecb ph\u00e2n ph\u1ed1i, \u0111\u01b0\u1eddng c\u1ea7u tr\u1ee5c h\u00e0nh lang, c\u1ea7u thang, s\u00e0n thang m\u00e1y, thi\u1ebft b\u1ecb n\u00e2ng, c\u00e1c \u0111\u01b0\u1eddng \u1ed1ng,&#8230;).<\/li>\n<li>C\u00e1c \u1ed1ng th\u00e9p trong b\u1ed9 d\u1eabn \u0111i\u1ec7n<\/li>\n<li>V\u1ecf nh\u00f4m c\u1ee7a c\u00e1p<\/li>\n<li>K\u1ebft c\u1ea5u \u0111\u00e0 thanh d\u1eabn, v\u1ecf kim lo\u1ea1i, c\u00e1c h\u1ed9p v\u00e0 m\u00e1ng b\u1eb1ng kim lo\u1ea1i c\u1ee7a thi\u1ebft b\u1ecb \u0111i\u1ec7n<\/li>\n<li>\u1ed0ng kim lo\u1ea1i \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t h\u1edf c\u1ed1 \u0111\u1ecbnh, c\u00f3 ch\u1ee9c n\u0103ng kh\u00e1c nhau tr\u1eeb c\u00e1c \u1ed1ng d\u1eabn c\u00e1c ch\u1ea5t v\u00e0 h\u1ee3p ch\u1ea5t ch\u00e1y n\u1ed5, h\u1ec7 th\u1ed1ng s\u01b0\u1edfi ch\u00ednh v\u00e0 h\u1ec7 th\u1ed1ng \u0111\u01b0\u1eddng \u1ed1ng d\u1eabn n\u01b0\u1edbc th\u1ea3i.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">4.2.2. Theo TCVN 4756:1989, kh\u00f4ng \u0111\u01b0\u1ee3c d\u00f9ng v\u1ecf kim lo\u1ea1i c\u1ee7a d\u00e2y d\u1eabn ki\u1ec3u \u1ed1ng, c\u00e1c \u1ed1ng d\u1eabn c\u00e1ch \u0111i\u1ec7n, c\u00e1p treo c\u1ee7a \u0111\u01b0\u1eddng d\u1eabn \u0111i\u1ec7n, c\u00e1c tay n\u1eafm kim lo\u1ea1i, v\u1ecf ch\u00ec c\u1ee7a d\u00e2y c\u00e1p v\u00e0 d\u00e2y d\u1eabn \u0111i\u1ec7n \u0111\u1ec3 l\u00e0m d\u00e2y n\u1ed1i \u0111\u1ea5t v\u00e0 d\u00e2y &#8220;kh\u00f4ng&#8221; b\u1ea3o v\u1ec7. Ch\u1ec9 \u0111\u01b0\u1ee3c d\u00f9ng v\u1ecf ch\u00ec c\u1ee7a c\u00e1p v\u00e0o m\u1ee5c \u0111\u00edch tr\u00ean \u0111\u1ed1i v\u1edbi l\u01b0\u1edbi \u0111i\u1ec7n th\u00e0nh ph\u1ed1 c\u00f3 \u0111i\u1ec7n \u00e1p 220\/127V v\u00e0 380\/220V khi th\u1ef1c hi\u1ec7n c\u1ea3i t\u1ea1o. C\u00e1c h\u1ed9p d\u1ea5u d\u00e2y v\u00e0 h\u1ed9p c\u00e1p ph\u1ea3i \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi v\u1ecf kim lo\u1ea1i b\u1eb1ng bu l\u00f4ng ho\u1eb7c b\u1eb1ng c\u00e1ch h\u00e0n.<\/p>\n<p style=\"text-align: justify;\">4.2.3. B\u1ed1 tr\u00ed c\u00e1c \u0111\u01b0\u1eddng tr\u1ee5c n\u1ed1i &#8220;kh\u00f4ng&#8221; ho\u1eb7c n\u1ed1i \u0111\u1ea5t v\u1ec1 c\u00e1c m\u1ea1ch r\u1ebd t\u1eeb tr\u1ee5c n\u00e0y \u1edf ngo\u00e0i tr\u1eddi v\u00e0 trong c\u00e1c ph\u00e2n x\u01b0\u1edfng ph\u1ea3i \u0111\u1ea3m b\u1ea3o \u0111\u1ec3 \u0111\u1ebfn ki\u1ec3m tra \u0111\u01b0\u1ee3c.<\/p>\n<p style=\"text-align: justify;\">T\u1eeb tr\u1ee5c ch\u00ednh c\u1ee7a m\u1ea1ch r\u1ebd \u0111\u1ebfn thi\u1ebft b\u1ecb \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n \u00e1p \u0111\u1ebfn 1000V c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1eb7t ng\u1ea7m trong t\u01b0\u1eddng nh\u00e0 d\u01b0\u1edbi n\u1ec1n s\u00e0n g\u1ea1ch, v\u00e0 c\u1ea7n \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 \u0111\u1ec3 tr\u00e1nh b\u1ecb \u0103n m\u00f2n. V\u00e0 trong ti\u00eau chu\u1ea9n TCVN 4756:1989 y\u00eau c\u1ea7u kh\u00f4ng \u0111\u01b0\u1ee3c c\u00f3 m\u1ed1i n\u1ed1i t\u1ea1i nh\u1eefng m\u1ea1ch r\u1ebd n\u00e0y.<\/p>\n<p style=\"text-align: justify;\">Ti\u00eau chu\u1ea9n TCVN 4756:1989 \u0111\u01b0a ra quy \u0111\u1ecbnh \u0111\u1ed1i v\u1edbi c\u00e1c thi\u1ebft b\u1ecb \u1edf ngo\u00e0i tr\u1eddi, cho ph\u00e9p \u0111\u1eb7t d\u00e2y &#8220;kh\u00f4ng&#8221; b\u1ea3o v\u1ec7 v\u00e0 d\u00e2y n\u1ed1i \u0111\u1ea5t d\u01b0\u1edbi n\u1ec1n, d\u01b0\u1edbi \u0111\u1ea5t ho\u1eb7c theo m\u00e9p c\u1ee7a b\u1ec7 m\u00e1y, m\u00f3ng c\u1ee7a thi\u1ebft b\u1ecb c\u00f4ng ngh\u1ec7,&#8230; Kh\u00f4ng \u0111\u01b0\u1ee3c d\u00f9ng d\u00e2y c\u00f3 c\u00e1ch \u0111i\u1ec7n \u0111\u1eb7t trong \u0111\u1ea5t \u0111\u1ec3 l\u00e0m d\u00e2y &#8220;kh\u00f4ng&#8221; b\u1ea3o v\u1ec7 v\u00e0 d\u00e2y n\u1ed1i \u0111\u1ea5t.<\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2694\" src=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-5.jpg\" alt=\"hinh 5\" width=\"1280\" height=\"724\" srcset=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-5.jpg 1280w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-5-300x170.jpg 300w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-5-1024x579.jpg 1024w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-5-768x434.jpg 768w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-5-696x394.jpg 696w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-5-1068x604.jpg 1068w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<h3 style=\"text-align: justify;\"><strong>4.3. N\u1ed1i d\u00e2y n\u1ed1i \u0111\u1ea5t v\u00e0 d\u00e2y kh\u00f4ng b\u1ea3o v\u1ec7 theo TCVN 4756:1989<\/strong><\/h3>\n<p style=\"text-align: justify;\">4.3.1. N\u1ed1i d\u00e2y &#8220;kh\u00f4ng&#8221; v\u1edbi nhau v\u00e0 n\u1ed1i d\u00e2y \u0111\u1ea5t v\u1edbi nhau ph\u1ea3i \u0111\u1ea3m b\u1ea3o ti\u1ebfp x\u00fac ch\u1eafn ch\u1eafn, \u0111\u01b0\u1ee3c th\u1ef1c ph\u00e9p hi\u1ec7n b\u1eb1ng c\u00e1ch h\u00e0n. D\u00e2y &#8220;kh\u00f4ng&#8221; b\u1ea3o v\u1ec7 c\u1ea7n \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi m\u1ea1ch v\u00f2ng n\u1ed1i &#8220;kh\u00f4ng&#8221; t\u1ed1i thi\u1ec3u l\u00e0 hai \u0111i\u1ec3m.<\/p>\n<p style=\"text-align: justify;\">TCVN 4756:1989 y\u00eau c\u1ea7u khi \u1edf ngo\u00e0i tr\u1eddi v\u00e0 trong c\u00e1c ph\u00e2n x\u01b0\u1edfng kh\u00f4ng c\u00f3 ch\u1ea5t \u0103n m\u00f2n th\u00ec c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c bi\u1ec7n ph\u00e1p kh\u00e1c \u0111\u1ec3 n\u1ed1i c\u00e1c d\u00e2y n\u1ed1i \u0111\u1ea5t v\u00e0 d\u00e2y &#8220;kh\u00f4ng&#8221; b\u1ea3o v\u1ec7. \u0110\u1ed1i v\u1edbi tr\u01b0\u1eddng h\u1ee3p n\u00e0y c\u1ea7n ph\u1ea3i c\u00f3 bi\u1ec7n ph\u00e1p ch\u1ed1ng n\u1edbi l\u1ecfng v\u00e0 ch\u1ed1ng g\u1ec9.<\/p>\n<p style=\"text-align: justify;\">Ti\u00eau chu\u1ea9n TCVN 4756:1989 cho ph\u00e9p n\u1ed1i d\u00e2y n\u1ed1i \u0111\u1ea5t v\u00e0 d\u00e2y &#8220;kh\u00f4ng&#8221; b\u1ea3o v\u1ec7 b\u1eb1ng bi\u1ec7n ph\u00e1p n\u1ed1i d\u00e2y pha cho c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n v\u00e0 cho \u0111\u01b0\u1eddng d\u00e2y d\u1eabn \u0111i\u1ec7n tr\u00ean kh\u00f4ng. V\u00e0 ph\u1ea3i n\u1ed1i d\u00e2y n\u1ed1i \u0111\u1ea5t v\u00e0 d\u00e2y &#8220;kh\u00f4ng&#8221; b\u1ea3o v\u1ec7 t\u1ea1i nh\u1eefng v\u1ecb tr\u00ed c\u00f3 th\u1ec3 \u0111\u1ebfn ki\u1ec3m tra \u0111\u01b0\u1ee3c.<\/p>\n<p style=\"text-align: justify;\">4.3.2. C\u00e1c \u1ed1ng th\u00e9p c\u1ee7a \u0111\u01b0\u1eddng d\u1eabn \u0111i\u1ec7n, c\u00e1c m\u00e1ng, c\u00e1c h\u1ed9p v\u00e0 c\u00e1c k\u1ebft c\u1ea5u kh\u00e1c \u0111\u01b0\u1ee3c d\u00f9ng l\u00e0m d\u00e2y &#8220;kh\u00f4ng&#8221; ho\u1eb7c d\u00e2y n\u1ed1i \u0111\u1ea5t b\u1ea3o v\u1ec7 ph\u1ea3i c\u00f3 m\u1ed1i n\u1ed1i \u0111\u1ea3m b\u1ea3o c\u00e1c y\u00eau c\u1ea7u theo ti\u00eau chu\u1ea9n TCVN 4756:1989. Gi\u1eefa c\u00e1c \u1ed1ng th\u00e9p v\u1edbi v\u1ecf c\u1ee7a thi\u1ebft b\u1ecb \u0111i\u1ec7n v\u00e0 gi\u1eefa c\u00e1c \u0111\u01b0\u1eddng \u1ed1ng v\u1edbi c\u00e1c h\u1ed9p kim lo\u1ea1i ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 ch\u1eafc ch\u1eafn v\u1ec1 n\u1ed1i ti\u1ebfp x\u00fac.<\/p>\n<p style=\"text-align: justify;\">4.3.3. C\u1ea7n l\u1ef1a ch\u1ecdn v\u1ecb tr\u00ed v\u00e0 s\u1ed1 \u0111i\u1ec3m n\u1ed1i d\u00e2y n\u1ed1i \u0111\u1ea5t v\u1edbi c\u1ef1c n\u1ed1i \u0111\u1ea5t t\u1ef1 nhi\u00ean k\u00e9o d\u00e0i \u0111\u1ec3 khi t\u00e1ch c\u1ef1c n\u1ed1i \u0111\u1ea5t ra, v\u00e0 ti\u1ebfn h\u00e0nh s\u1eeda ch\u1eefa th\u00ec v\u1eabn \u0111\u1ea3m b\u1ea3o gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf t\u00ednh to\u00e1n c\u1ee7a trang b\u1ecb n\u1ed1i \u0111\u1ea5t, c\u00e1c van, kh\u00f3a, c\u00e1c \u0111\u1ed3ng h\u1ed3 \u0111o n\u01b0\u1edbc,&#8230; V\u00e0 ti\u00eau chu\u1ea9n TCVN 4756:1989 y\u00eau c\u1ea7u c\u1ea7n ph\u1ea3i c\u00f3 c\u1ea7u n\u1ed1i \u0111\u1ec3 m\u1ea1ch n\u1ed1i \u0111\u1ea5t li\u00ean t\u1ee5c \u0111\u01b0\u1ee3c \u0111\u1ea3m b\u1ea3o.<\/p>\n<p style=\"text-align: justify;\">4.3.4. Theo TCVN 4756:1989, ph\u1ea3i d\u00f9ng bu l\u00f4ng ho\u1eb7c h\u00e0n khi n\u1ed1i d\u00e2y n\u1ed1i \u0111\u1ea5t v\u00e0 d\u00e2y &#8220;kh\u00f4ng&#8221; b\u1ea3o v\u1ec7 v\u1edbi c\u00e1c b\u1ed9 ph\u1eadn c\u1ee7a thi\u1ebft b\u1ecb \u0111i\u1ec7n. M\u1ed1i n\u1ed1i ph\u1ea3i b\u1ed1 tr\u00ed \u1edf v\u1ecb tr\u00ed d\u1ec5 d\u00e0ng d\u1ec5 ki\u1ec3m tra. V\u00e0 ph\u1ea3i c\u00f3 bi\u1ec7n ph\u00e1p ch\u1ed1ng b\u1ecb n\u1edbi l\u1ecfng v\u00e0 ch\u1ed1ng g\u1ec9 \u0111\u1ed1i v\u1edbi c\u00e1c m\u1ed1i n\u1ed1i b\u1eb1ng bu l\u00f4ng. Trong ti\u00eau chu\u1ea9n TCVN 4756:1989 \u0111\u1ec3 n\u1ed1i \u0111\u1ea5t v\u00e0 n\u1ed1i &#8220;kh\u00f4ng&#8221; cho c\u00e1c thi\u1ebft b\u1ecb \u0111\u1eb7t tr\u00ean c\u00e1c b\u1ed9 ph\u1eadn chuy\u1ec3n \u0111\u1ed9ng ho\u1eb7c rung, l\u1eafc hay th\u01b0\u1eddng \u0111\u01b0\u1ee3c th\u00e1o r\u1eddi ra hay d\u00f9ng c\u00e1c d\u00e2y d\u1eabn m\u1ec1m.<\/p>\n<p style=\"text-align: justify;\">4.3.5. Ti\u00eau chu\u1ea9n TCVN 4756:1989 y\u00eau c\u1ea7u ph\u1ea3i d\u00f9ng c\u00e1c nh\u00e1nh ri\u00eang bi\u1ec7t \u0111\u1ed1i v\u1edbi m\u1ed7i thi\u1ebft b\u1ecb \u0111i\u1ec7n c\u1ea7n n\u1ed1i \u0111\u1ea5t ho\u1eb7c n\u1ed1i &#8220;kh\u00f4ng&#8221;. V\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p \u0111\u1ea5u n\u1ed1i ti\u1ebfp c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n v\u00e0o d\u00e2y &#8220;kh\u00f4ng&#8221; b\u1ea3o v\u1ec7 ho\u1eb7c d\u00e2y n\u1ed1i \u0111\u1ea5t.<\/p>\n<figure id=\"attachment_2695\" aria-describedby=\"caption-attachment-2695\" style=\"width: 2560px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2695\" src=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/hinh-6-IMG_0577-scaled.jpg\" alt=\"N\u1ed1i d\u00e2y n\u1ed1i \u0111\u1ea5t v\u00e0 d\u00e2y kh\u00f4ng b\u1ea3o v\u1ec7 theo TCVN 4756:1989\" width=\"2560\" height=\"1920\" srcset=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/hinh-6-IMG_0577-scaled.jpg 2560w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/hinh-6-IMG_0577-300x225.jpg 300w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/hinh-6-IMG_0577-1024x768.jpg 1024w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/hinh-6-IMG_0577-768x576.jpg 768w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/hinh-6-IMG_0577-1536x1152.jpg 1536w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/hinh-6-IMG_0577-2048x1536.jpg 2048w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/hinh-6-IMG_0577-696x522.jpg 696w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/hinh-6-IMG_0577-1068x801.jpg 1068w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/hinh-6-IMG_0577-1920x1440.jpg 1920w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-2695\" class=\"wp-caption-text\"><span style=\"font-size: 16px;\">N\u1ed1i d\u00e2y n\u1ed1i \u0111\u1ea5t v\u00e0 d\u00e2y kh\u00f4ng b\u1ea3o v\u1ec7 theo TCVN 4756:1989<\/span><\/figcaption><\/figure>\n<h2 style=\"text-align: justify;\"><strong>5. N\u1ed1i \u0111\u1ea5t v\u00e0 n\u1ed1i &#8220;kh\u00f4ng&#8221; thi\u1ebft b\u1ecb \u0111i\u1ec7n di \u0111\u1ed9ng c\u1ea7m tay theo TCVN 4756:1989<\/strong><\/h2>\n<h3 style=\"text-align: justify;\"><strong>5.1. N\u1ed1i \u0111\u1ea5t v\u00e0 n\u1ed1i &#8220;kh\u00f4ng&#8221; v\u1edbi thi\u1ebft b\u1ecb \u0111i\u1ec7n c\u1ea7m tay theo TCVN 4756:1989<\/strong><\/h3>\n<p style=\"text-align: justify;\">5.1.1. C\u00e1c thi\u1ebft b\u1ecb c\u1ea7m tay c\u1ea7n \u0111\u01b0\u1ee3c cung c\u1ea5p \u0111i\u1ec7n t\u1eeb l\u01b0\u1edbi \u0111i\u1ec7n c\u00f3 \u0111i\u1ec7n \u00e1p t\u1ed1i \u0111a l\u00e0 380\/220V theo TCVN 4756:1989.<\/p>\n<p style=\"text-align: justify;\">C\u00f3 th\u1ec3 cung c\u1ea5p \u0111i\u1ec7n tr\u1ef1c ti\u1ebfp t\u1eeb l\u01b0\u1edbi \u0111i\u1ec7n, qua m\u00e1y bi\u1ebfn \u00e1p h\u1ea1 \u00e1p ho\u1eb7c qua m\u00e1y bi\u1ebfn \u00e1p c\u00e1ch ly t\u00f9y thu\u1ed9c v\u00e0o m\u1ee9c nguy hi\u1ec3m v\u1ec1 \u0111i\u1ec7n c\u1ee7a gian \u0111\u1eb7t thi\u1ebft b\u1ecb \u0111\u1ec3 c\u00e1c d\u1ee5ng c\u1ee5 \u0111i\u1ec7n c\u1ea7m tay. Ti\u00eau chu\u1ea9n TCVN 4756:1989 \u0111\u01b0a ra quy \u0111\u1ecbnh v\u1ec1 v\u1ecf kim lo\u1ea1i c\u1ee7a c\u00e1c d\u1ee5ng c\u1ee5 \u0111i\u1ec7n c\u1ea7m tay c\u1ea7n \u0111\u01b0\u1ee3c n\u1ed1i \u0111\u1ea5t ho\u1eb7c n\u1ed1i &#8220;kh\u00f4ng&#8221;, ngo\u1ea1i tr\u1eeb c\u00e1c d\u1ee5ng c\u1ee5 \u0111i\u1ec7n c\u00f3 c\u00e1ch \u0111i\u1ec7n k\u00e9p ho\u1eb7c \u0111\u01b0\u1ee3c trang b\u1ecb \u0111i\u1ec7n t\u1eeb m\u00e1y bi\u1ebfn \u00e1p c\u00e1ch ly.<\/p>\n<p style=\"text-align: justify;\">5.1.2. Theo TCVN 4756:1989 y\u00eau c\u1ea7u ph\u1ea3i d\u00f9ng c\u00e1c d\u00e2y ri\u00eang \u0111\u1ec3 n\u1ed1i \u0111\u1ea5t ho\u1eb7c n\u1ed1i &#8220;kh\u00f4ng&#8221; cho c\u00e1c d\u1ee5ng c\u1ee5 \u0111i\u1ec7n c\u1ea7m tay. N\u00ean \u0111\u1eb7t d\u00e2y n\u00e0y trong c\u00f9ng m\u1ed9t v\u1ecf c\u1ee7a d\u00e2y pha v\u00e0 n\u1ed1i v\u1edbi v\u1ecf c\u1ee7a d\u1ee5ng c\u1ee5 \u0111i\u1ec7n. K\u00edch th\u01b0\u1edbc ti\u1ebft di\u1ec7n c\u1ee7a d\u00e2y n\u00e0y n\u00ean s\u1eed d\u1ee5ng b\u1eb1ng ti\u1ebft di\u1ec7n c\u1ee7a d\u00e2y pha. V\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c d\u00f9ng d\u00e2y &#8220;kh\u00f4ng&#8221; l\u00e0m vi\u1ec7c \u0111\u1eb7t trong c\u00f9ng m\u1ed9t v\u1ecf chung \u0111\u1ec3 l\u00e0m d\u00e2y n\u1ed1i \u201ckh\u00f4ng\u201d hay n\u1ed1i \u0111\u1ea5t.<\/p>\n<p style=\"text-align: justify;\">C\u00e1c l\u00f5i c\u1ee7a d\u00e2y c\u00e1p v\u00e0 d\u00e2y d\u1eabn \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 l\u00e0m d\u00e2y n\u1ed1i \u0111\u1ea5t ho\u1eb7c n\u1ed1i &#8220;kh\u00f4ng&#8221; cho c\u00e1c d\u1ee5ng c\u1ee5 \u0111i\u1ec7n c\u1ea7m tay n\u00ean s\u1eed d\u1ee5ng d\u00e2y \u0111\u1ed3ng m\u1ec1m c\u00f3 ti\u1ebft di\u1ec7n t\u1ed1i thi\u1ec3u 1,5mm2 \u0111\u1ed1i v\u1edbi d\u1ee5ng c\u1ee5 \u0111i\u1ec7n c\u1ea7m tay d\u00f9ng trong c\u00f4ng nghi\u1ec7p. V\u00e0 c\u00e1c d\u1ee5ng c\u1ee5 \u0111i\u1ec7n c\u1ea7m tay d\u00f9ng trong sinh ho\u1ea1t t\u1ed1i thi\u1ec3u l\u00e0 0,75mm2 theo TCVN 4756:1989.<\/p>\n<h3 style=\"text-align: justify;\"><strong>5.2. N\u1ed1i \u0111\u1ea5t v\u00e0 n\u1ed1i &#8220;kh\u00f4ng&#8221; cho thi\u1ebft b\u1ecb \u0111i\u1ec7n di \u0111\u1ed9ng theo TCVN 4756:1989<\/strong><\/h3>\n<p style=\"text-align: justify;\">5.2.1. Khi cung c\u1ea5p \u0111i\u1ec7n cho c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n c\u1ed1 \u0111\u1ecbnh t\u1eeb ngu\u1ed3n di \u0111\u1ed9ng \u0111\u1ed9c l\u1eadp th\u00ec ch\u1ebf \u0111\u1ed9 trung t\u00ednh, c\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o v\u1ec7 c\u1ee7a ngu\u1ed3n c\u1ea5p ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi ch\u1ebf \u0111\u1ed9 trung t\u00ednh v\u00e0 c\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o v\u1ec7 c\u00f3 trong m\u1ea1ng \u0111i\u1ec7n c\u1ee7a c\u00e1c d\u1ee5ng c\u1ee5 \u0111i\u1ec7n c\u1ed1 \u0111\u1ecbnh theo ti\u00eau chu\u1ea9n TCVN 4756:1989.<\/p>\n<p style=\"text-align: justify;\">5.2.2. Khi cung c\u1ea5p \u0111i\u1ec7n cho c\u00e1c d\u1ee5ng c\u1ee5 c\u1ee7a thi\u1ebft b\u1ecb di \u0111\u1ed9ng t\u1eeb ngu\u1ed3n \u0111i\u1ec7n c\u1ed1 \u0111\u1ecbnh v\u00e0 di \u0111\u1ed9ng c\u00f3 trung t\u00ednh c\u00e1ch ly, TCVN 4756:1989 y\u00eau c\u1ea7u c\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o v\u1ec7 c\u1ea7n \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng \u0111\u00f3 l\u00e0 n\u1ed1i \u0111\u1ea5t b\u1ea3o v\u1ec7 k\u1ebft h\u1ee3p v\u1edbi v\u1ecf c\u1ee7a ngu\u1ed3n cung c\u1ea5p v\u00e0 v\u1ecf thi\u1ebft b\u1ecb ho\u1eb7c k\u1ebft h\u1ee3p v\u1edbi c\u1eaft b\u1ea3o v\u1ec7.<\/p>\n<p style=\"text-align: justify;\">Trong ti\u00eau chu\u1ea9n TCVN 4756:1989, kh\u00f4ng c\u1ea7n n\u1ed1i v\u1ecf c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb v\u1edbi v\u1ecf ngu\u1ed3n \u0111i\u1ec7n n\u1ebfu thi\u1ebft b\u1ecb di \u0111\u1ed9ng v\u00e0 ngu\u1ed3n c\u1ea5p c\u00f3 c\u00e1c m\u1ea1ch v\u00f2ng n\u1ed1i \u0111\u1ea5t b\u1ea3o v\u1ec7 ri\u00eang, khi c\u00f3 ng\u1eafn m\u1ea1ch ra v\u1ecf c\u1ee7a thi\u1ebft b\u1ecb \u0111i\u1ec7n ph\u1ea3i \u0111\u1ea3m b\u1ea3o \u0111\u01b0\u1ee3c m\u1ee9c \u0111i\u1ec7n \u00e1p cho ph\u00e9p.<\/p>\n<p style=\"text-align: justify;\">5.2.3. Khi cung c\u1ea5p \u0111i\u1ec7n cho c\u00e1c d\u1ee5ng c\u1ee5 c\u1ee7a thi\u1ebft b\u1ecb di \u0111\u1ed9ng t\u1eeb ngu\u1ed3n \u0111i\u1ec7n di \u0111\u1ed9ng \u0111\u1ed9c l\u1eadp th\u00ec ph\u1ea3i c\u00e1ch ly \u0111i\u1ec3m trung t\u00ednh c\u1ee7a l\u01b0\u1edbi \u0111i\u1ec7n ba pha, ba d\u00e2y v\u00e0 ba pha b\u1ed1n d\u00e2y d\u1eabn. \u0110\u1ed3ng th\u1eddi l\u00e0 c\u00e1c \u0111\u1ea7u ra c\u1ee7a l\u01b0\u1edbi \u0111i\u1ec7n m\u1ed9t pha hai d\u00e2y d\u1eabn. TCVN 4756:1989 cho ph\u00e9p th\u1ef1c hi\u1ec7n n\u1ed1i \u0111\u1ea5t b\u1ea3o v\u1ec7 ch\u1ec9 cho ngu\u1ed3n cung c\u1ea5p \u0111i\u1ec7n trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y v\u00e0 d\u00f9ng d\u00e2y n\u1ed1i v\u1ecf ngu\u1ed3n \u0111i\u1ec7n v\u1edbi v\u1ecf d\u1ee5ng c\u1ee5 \u0111i\u1ec7n.<\/p>\n<figure id=\"attachment_2696\" aria-describedby=\"caption-attachment-2696\" style=\"width: 2560px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2696\" src=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-7-IMG_0466-scaled.jpg\" alt=\"Thang m\u00e1ng c\u00e1p d\u00f9ng \u0111\u1ec3 b\u1ea3o v\u1ec7 d\u00e2y c\u00e1p \u0111i\u1ec7n\" width=\"2560\" height=\"1920\" srcset=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-7-IMG_0466-scaled.jpg 2560w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-7-IMG_0466-300x225.jpg 300w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-7-IMG_0466-1024x768.jpg 1024w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-7-IMG_0466-768x576.jpg 768w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-7-IMG_0466-1536x1152.jpg 1536w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-7-IMG_0466-2048x1536.jpg 2048w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-7-IMG_0466-696x522.jpg 696w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-7-IMG_0466-1068x801.jpg 1068w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-7-IMG_0466-1920x1440.jpg 1920w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-2696\" class=\"wp-caption-text\"><span style=\"font-size: 16px;\">Thang m\u00e1ng c\u00e1p d\u00f9ng \u0111\u1ec3 b\u1ea3o v\u1ec7 d\u00e2y c\u00e1p \u0111i\u1ec7n<\/span><\/figcaption><\/figure>\n<h2 style=\"text-align: justify;\"><strong>6. Ki\u1ec3m tra n\u1ed1i \u0111\u1ea5t v\u00e0 n\u1ed1i &#8220;kh\u00f4ng&#8221; theo TCVN 4756:1989<\/strong><\/h2>\n<p style=\"text-align: justify;\">6.1. Trang b\u1ecb n\u1ed1i \u0111\u1ea5t v\u00e0 n\u1ed1i &#8220;kh\u00f4ng&#8221; c\u1ee7a thi\u1ebft b\u1ecb \u0111i\u1ec7n c\u1ea7n \u0111\u01b0\u1ee3c ki\u1ec3m tra khi nghi\u1ec7m thu, ki\u1ec3m tra b\u1ea5t th\u01b0\u1eddng v\u00e0 ki\u1ec3m tra \u0111\u1ecbnh k\u1ef3.<\/p>\n<p style=\"text-align: justify;\">6.2. Th\u1ef1c hi\u1ec7n qu\u00e1 tr\u00ecnh ki\u1ec3m tra nghi\u1ec7m thu sau khi \u0111\u00e3 l\u1eafp \u0111\u1eb7t xong n\u1ed1i \u0111\u1ea5t, n\u1ed1i &#8220;kh\u00f4ng&#8221; v\u00e0 tr\u01b0\u1edbc khi \u0111\u01b0a v\u00e0o s\u1eed d\u1ee5ng theo TCVN 4756:1989. Qu\u00e1 tr\u00ecnh n\u00e0y \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh theo hai b\u01b0\u1edbc.<\/p>\n<ul style=\"text-align: justify;\">\n<li>\u0110\u1ed1i v\u1edbi c\u00e1c ph\u1ea7n ng\u1ea7m ch\u00f4n trong c\u00e1c k\u1ebft c\u1ea5u ho\u1eb7c d\u01b0\u1edbi \u0111\u1ea5t ph\u1ea3i \u0111\u01b0\u1ee3c ki\u1ec3m tra tr\u01b0\u1edbc khi l\u1ea5p k\u00edn ho\u1eb7c l\u1ea5p \u0111\u1ea5t<\/li>\n<li>Ki\u1ec3m tra sau khi ho\u00e0n thi\u1ec7n to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng \u0111\u1ec3 \u0111\u01b0a v\u00e0o s\u1eed d\u1ee5ng<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">6.3. Th\u1ef1c hi\u1ec7n ki\u1ec3m tra \u0111\u1ecbnh k\u1ef3 theo TCVN 4756:1989 trong th\u1eddi gian quy \u0111\u1ecbnh sau:<\/p>\n<ul style=\"text-align: justify;\">\n<li>M\u1ed9t n\u0103m m\u1ed9t l\u1ea7n \u0111\u1ed1i v\u1edbi c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n \u0111\u01b0\u1ee3c b\u1ed1 tr\u00ed t\u1ea1i nh\u1eefng n\u01a1i nguy hi\u1ec3m<\/li>\n<li>S\u00e1u th\u00e1ng m\u1ed9t l\u1ea7n \u0111\u1ed1i v\u1edbi c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n \u0111\u01b0\u1ee3c b\u1ed1 tr\u00ed t\u1ea1i nh\u1eefng n\u01a1i \u0111\u1eb7c bi\u1ec7t nguy hi\u1ec3m v\u1ec1 \u0111i\u1ec7n<\/li>\n<li>Hai n\u0103m m\u1ed9t l\u1ea7n \u0111\u1ed1i v\u1edbi thi\u1ebft b\u1ecb \u0111i\u1ec7n \u0111\u01b0\u1ee3c b\u1ed1 tr\u00ed \u1edf nh\u1eefng n\u01a1i \u00edt nguy hi\u1ec3m<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">6.4. Theo TCVN 4756:1989, th\u1ef1c hi\u1ec7n ki\u1ec3m tra b\u1ea5t th\u01b0\u1eddng theo quy \u0111\u1ecbnh:<\/p>\n<ul style=\"text-align: justify;\">\n<li>Khi x\u1ea3y ra s\u1ef1 c\u1ed1, tai n\u1ea1n ho\u1eb7c c\u00f3 nguy c\u01a1 x\u1ea3y ra tai n\u1ea1n<\/li>\n<li>Sau khi s\u1eeda ch\u1eefa ho\u1eb7c l\u1eafp \u0111\u1eb7t l\u1ea1i thi\u1ebft b\u1ecb n\u1ed1i \u0111\u1ea5t, n\u1ed1i &#8220;kh\u00f4ng&#8221;<\/li>\n<li>Sau khi c\u00f3 b\u00e3o, l\u0169, m\u01b0a l\u1edbn l\u00e0m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn ch\u1ea5t l\u01b0\u1ee3ng trang b\u1ecb n\u1ed1i \u0111\u1ea5t, n\u1ed1i &#8220;kh\u00f4ng&#8221;<\/li>\n<li>Khi x\u00e2y d\u1ef1ng ho\u1eb7c s\u1eeda ch\u1eefa \u0111\u1ed1i v\u1edbi c\u00e1c c\u00f4ng tr\u00ecnh kh\u00e1c c\u00f3 kh\u1ea3 n\u0103ng g\u00e2y h\u01b0 h\u1ecfng t\u1edbi c\u00e1c b\u1ed9 ph\u1eadn c\u1ee7a trang b\u1ecb n\u1ed1i \u0111\u1ea5t, n\u1ed1i &#8220;kh\u00f4ng&#8221;<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">6.5. Ki\u1ec3m tra nghi\u1ec7m thu theo TCVN 4756:1989 bao g\u1ed3m c\u00e1c n\u1ed9i dung:<\/p>\n<ul style=\"text-align: justify;\">\n<li>Ki\u1ec3m tra vi\u1ec7c l\u1eafp \u0111\u1eb7t gi\u1eefa thi\u1ebft k\u1ebf so v\u1edbi th\u1ef1c t\u1ebf<\/li>\n<li>Ki\u1ec3m tra vi\u1ec7c s\u1eed d\u1ee5ng nguy\u00ean v\u1eadt li\u1ec7u d\u1ef1a tr\u00ean y\u00eau c\u1ea7u thi\u1ebft k\u1ebf<\/li>\n<li>Ki\u1ec3m tra to\u00e0n b\u1ed9 c\u00e1c m\u1ed1i n\u1ed1i, m\u1ed1i h\u00e0n, xem x\u00e9t v\u1ec1 \u0111i\u1ec7n tr\u1edf ti\u1ebfp x\u00fac, \u0111\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc<\/li>\n<li>Ki\u1ec3m tra bi\u1ec7n ph\u00e1p ch\u1ed1ng g\u1ec9, ch\u1ed1ng \u0103n m\u00f2n<\/li>\n<li>Ki\u1ec3m tra vi\u1ec7c b\u1ea3o v\u1ec7 m\u1ea1ch d\u1eabn khi \u0111i qua ch\u01b0\u1edbng ng\u1ea1i v\u00e0 c\u00e1c khe l\u00fan khe co gi\u00e3n<\/li>\n<li>Ki\u1ec3m tra c\u00e1c bi\u1ec7n ph\u00e1p ch\u1ed1ng \u0111i\u1ec7n \u00e1p b\u01b0\u1edbc v\u00e0 \u0111i\u1ec7n \u00e1p ch\u1ea1m \u1edf nh\u1eefng n\u01a1i c\u1ea7n thi\u1ebft<\/li>\n<li>Ki\u1ec3m tra vi\u1ec7c l\u1ea5p \u0111\u1ea5t v\u00e0 ti\u1ebfn h\u00e0nh \u0111o \u0111i\u1ec7n tr\u1edf n\u1ed1i \u0111\u1ea5t<\/li>\n<li>Ki\u1ec3m tra \u0111i\u1ec7n tr\u1edf m\u1ea1ch pha &#8211; d\u00e2y \u201ckh\u00f4ng\u201d c\u0169ng nh\u01b0 kh\u1ea3 n\u0103ng c\u1eaft c\u1ee7a thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">TCVN 4756:1989, vi\u1ec7c ki\u1ec3m tra \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1eb1ng c\u00e1ch ph\u01b0\u01a1ng ph\u00e1p nh\u01b0 xem x\u00e9t b\u1eb1ng m\u1eaft, d\u00f9ng th\u01b0\u1edbc \u0111o, m\u00e1y \u0111o \u0111i\u1ec7n tr\u1edf m\u1ea1ch pha &#8211; d\u00e2y &#8220;kh\u00f4ng&#8221;, m\u00e1y \u0111o \u0111i\u1ec7n tr\u1edf n\u1ed1i \u0111\u1ea5t,&#8230;<\/p>\n<p style=\"text-align: justify;\">6.6. Ki\u1ec3m tra \u0111\u1ecbnh k\u1ef3 v\u00e0 ki\u1ec3m tra \u0111\u1ed9t xu\u1ea5t theo TCVN 4756:1989 bao g\u1ed3m c\u00e1c n\u1ed9i dung:<\/p>\n<ul style=\"text-align: justify;\">\n<li>\u0110o \u0111i\u1ec7n tr\u1edf n\u1ed1i \u0111\u1ea5t v\u00e0 \u0111i\u1ec7n tr\u1edf m\u1ea1ch pha &#8211; d\u00e2y &#8220;kh\u00f4ng&#8221;<\/li>\n<li>Ki\u1ec3m tra to\u00e0n b\u1ed9 v\u1ec1 trang b\u1ecb n\u1ed1i \u0111\u1ea5t, n\u1ed1i &#8220;kh\u00f4ng&#8221;<\/li>\n<li>Ki\u1ec3m tra c\u00e1c m\u1ed1i n\u1ed1i, m\u1ed1i h\u00e0n<\/li>\n<li>Ki\u1ec3m tra t\u00ecnh tr\u1ea1ng c\u00e1c l\u1edbp s\u01a1n ho\u1eb7c m\u1ea1 ch\u1ed1ng g\u1ec9, ch\u1ed1ng \u0103n m\u00f2n<\/li>\n<\/ul>\n<figure id=\"attachment_2697\" aria-describedby=\"caption-attachment-2697\" style=\"width: 1778px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2697\" src=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-8-A66-49.jpg\" alt=\"Ki\u1ec3m tra b\u1ec1 d\u00e0y l\u1edbp ph\u1ee7 m\u1ea1 k\u1ebdm nh\u00fang n\u00f3ng khay c\u00e1p \u0111i\u1ec7n Bestray\" width=\"1778\" height=\"1000\" srcset=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-8-A66-49.jpg 1778w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-8-A66-49-300x169.jpg 300w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-8-A66-49-1024x576.jpg 1024w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-8-A66-49-768x432.jpg 768w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-8-A66-49-1536x864.jpg 1536w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-8-A66-49-696x391.jpg 696w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-8-A66-49-1068x601.jpg 1068w\" sizes=\"auto, (max-width: 1778px) 100vw, 1778px\" \/><figcaption id=\"caption-attachment-2697\" class=\"wp-caption-text\"><span style=\"font-size: 16px;\">Ki\u1ec3m tra b\u1ec1 d\u00e0y l\u1edbp ph\u1ee7 m\u1ea1 k\u1ebdm nh\u00fang n\u00f3ng khay c\u00e1p \u0111i\u1ec7n Bestray<\/span><\/figcaption><\/figure>\n<ul style=\"text-align: justify;\">\n<li>Ki\u1ec3m tra m\u1eb7t ti\u1ebfp x\u00fac \u0111i\u1ec7n<\/li>\n<li>Ki\u1ec3m tra ph\u1ea7n ng\u1ea7m v\u00e0 nh\u1eefng ch\u1ed7 nghi ng\u1edd b\u1eb1ng c\u00e1ch \u0111\u00e0o l\u00ean xem v\u00e0 \u0111o \u0111\u1ea1c l\u1ea1i<\/li>\n<li>Ki\u1ec3m tra c\u00e1c m\u1ea1ch d\u1eabn khi \u0111i qua ch\u01b0\u1edbng ng\u1ea1i<\/li>\n<li>Ki\u1ec3m tra v\u1ec1 t\u00ecnh tr\u1ea1ng c\u1ee7a \u0111\u1ea5t<\/li>\n<\/ul>\n<h2 style=\"text-align: justify;\"><strong>7. K\u1ebft lu\u1eadn<\/strong><\/h2>\n<p style=\"text-align: justify;\">Tr\u00ean \u0111\u00e2y l\u00e0 nh\u1eefng n\u1ed9i dung ch\u00ednh b\u1ea1n c\u1ea7n bi\u1ebft v\u1ec1 ti\u00eau chu\u1ea9n TCVN 4756:1989. Ti\u00eau chu\u1ea9n n\u00e0y s\u1ebd gi\u00fap b\u1ea1n c\u00f3 th\u1ec3 thi\u1ebft k\u1ebf v\u00e0 l\u1eafp \u0111\u1eb7t n\u1ed1i \u0111\u1ea5t, n\u1ed1i \u201ckh\u00f4ng\u201d thi\u1ebft b\u1ecb \u0111i\u1ec7n m\u1ed9t c\u00e1ch an to\u00e0n. Nh\u1edd v\u1eady, qu\u00e1 tr\u00ecnh s\u1eed d\u1ee5ng c\u0169ng \u0111\u01b0\u1ee3c \u0111\u1ea3m b\u1ea3o hi\u1ec7u qu\u1ea3 v\u00e0 tr\u00e1nh t\u00ecnh tr\u1ea1ng g\u00e2y h\u01b0 h\u1ecfng li\u00ean quan \u0111\u1ebfn thi\u1ebft b\u1ecb \u0111i\u1ec7n.<\/p>\n<figure id=\"attachment_2698\" aria-describedby=\"caption-attachment-2698\" style=\"width: 1778px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2698\" src=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-9-A80-1.jpg\" alt=\"M\u00e1ng l\u01b0\u1edbi Bestray \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea5p ch\u1ee9ng nh\u1eadn theo ti\u00eau chu\u1ea9n UL\" width=\"1778\" height=\"1000\" srcset=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-9-A80-1.jpg 1778w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-9-A80-1-300x169.jpg 300w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-9-A80-1-1024x576.jpg 1024w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-9-A80-1-768x432.jpg 768w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-9-A80-1-1536x864.jpg 1536w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-9-A80-1-696x391.jpg 696w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-9-A80-1-1068x601.jpg 1068w\" sizes=\"auto, (max-width: 1778px) 100vw, 1778px\" \/><figcaption id=\"caption-attachment-2698\" class=\"wp-caption-text\"><span style=\"font-size: 16px;\">M\u00e1ng l\u01b0\u1edbi Bestray \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea5p ch\u1ee9ng nh\u1eadn theo ti\u00eau chu\u1ea9n UL<\/span><\/figcaption><\/figure>\n<figure id=\"attachment_2699\" aria-describedby=\"caption-attachment-2699\" style=\"width: 1778px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2699\" src=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-10-A60-51.jpg\" alt=\"M\u00e1ng l\u01b0\u1edbi Bestray \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea5p ch\u1ee9ng nh\u1eadn theo ti\u00eau chu\u1ea9n UL\" width=\"1778\" height=\"1000\" srcset=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-10-A60-51.jpg 1778w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-10-A60-51-300x169.jpg 300w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-10-A60-51-1024x576.jpg 1024w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-10-A60-51-768x432.jpg 768w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-10-A60-51-1536x864.jpg 1536w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-10-A60-51-696x391.jpg 696w, https:\/\/bestray.com\/blog\/wp-content\/uploads\/2022\/01\/Hinh-10-A60-51-1068x601.jpg 1068w\" sizes=\"auto, (max-width: 1778px) 100vw, 1778px\" \/><figcaption id=\"caption-attachment-2699\" class=\"wp-caption-text\"><span style=\"font-size: 16px;\">M\u00e1ng l\u01b0\u1edbi Bestray \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea5p ch\u1ee9ng nh\u1eadn theo ti\u00eau chu\u1ea9n UL<\/span><\/figcaption><\/figure>\n<p style=\"text-align: justify;\">\u0110\u1ec3 b\u1ea3o v\u1ec7 d\u00e2y \u0111i\u1ec7n, c\u00e1p \u0111i\u1ec7n b\u1ea1n c\u00f3 th\u1ec3 c\u00e2n nh\u1eafc l\u1eafp \u0111\u1eb7t <strong><span style=\"color: #ff0000;\"><a style=\"color: #ff0000;\" href=\"https:\/\/bestray.com\/cable-management\/thang-cap\/\">thang c\u00e1p<\/a>, <a style=\"color: #ff0000;\" href=\"https:\/\/bestray.com\/cable-management\/mang-cap\/\">m\u00e1ng c\u00e1p<\/a><\/span><\/strong>, <strong><a href=\"https:\/\/bestray.com\/cable-management\/khay-cap\/\" target=\"_blank\" rel=\"noopener\">khay c\u00e1p<\/a> , <a href=\"https:\/\/bestray.com\/cable-management\/mang-luoi\/\" target=\"_blank\" rel=\"noopener\">m\u00e1ng l\u01b0\u1edbi <\/a><\/strong>v\u00e0<a href=\"https:\/\/bestray.com\/blog\/lua-chon-phu-kien-mang-cap\/\" target=\"_blank\" rel=\"noopener\"><strong> ph\u1ee5 ki\u1ec7n m\u00e1ng c\u00e1p<\/strong><\/a> c\u1ee7a Bestray. \u0110\u00e2y l\u00e0 h\u1ec7 th\u1ed1ng chuy\u00ean \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c \u0111\u01b0\u1eddng d\u00e2y d\u1eabn, d\u00e2y \u0111i\u1ec7n trong c\u00e1c t\u00f2a nh\u00e0, khu chung c\u01b0, khu c\u00f4ng nghi\u1ec7p nh\u1eb1m \u0111\u1ea3m b\u1ea3o an to\u00e0n v\u1ec1 thi\u1ebft b\u1ecb \u0111i\u1ec7n trong qu\u00e1 tr\u00ecnh s\u1eed d\u1ee5ng. \u0110\u1ed3ng th\u1eddi, n\u00f3 c\u0169ng gi\u00fap cho vi\u1ec7c ki\u1ec3m tra, s\u1eeda ch\u1eefa v\u00e0 thay th\u1ebf tr\u1edf n\u00ean d\u1ec5 d\u00e0ng v\u00e0 thu\u1eadn ti\u1ec7n h\u01a1n. \u0110\u1ec3 bi\u1ebft th\u00eam v\u1ec1 c\u00e1c th\u00f4ng tin kh\u00e1c c\u0169ng nh\u01b0 v\u1ec1 h\u1ec7 th\u1ed1ng thang c\u00e1p, m\u00e1ng c\u00e1p, khay c\u00e1p t\u1ea1i Bestray, b\u1ea1n c\u00f3 t\u00ecm hi\u1ec3u t\u1ea1i website <a href=\"https:\/\/bestray.com\/blog\/\">https:\/\/bestray.com\/blog\/<\/a>.<\/p>\n<p style=\"text-align: justify;\">M\u1ecdi th\u1eafc m\u1eafc v\u00e0 th\u00f4ng tin \u0111\u1eb7t h\u00e0ng s\u1ea3n ph\u1ea9m c\u00f3 th\u1ec3 li\u00ean h\u1ec7 tr\u1ef1c ti\u1ebfp v\u1edbi ch\u00fang t\u00f4i theo Hotline 0909 089 678<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-5197\" src=\"https:\/\/bestray.com\/blog\/wp-content\/uploads\/2024\/02\/Thang-Mang-Cap-Bestray-Chat-Luong-Cao-\u2013-Giai-Phap-Bao-Ve-An-Toan-Cho-He-Thong-Dien-1.gif\" alt=\"thang m\u00e1ng c\u00e1p\" width=\"1080\" height=\"1080\" \/><\/p>\n<p>&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;<\/p>\n<h2><strong>C\u00f4ng Ty C\u1ed5 Ph\u1ea7n BesTray &#8211; Chuy\u00ean S\u1ea3n Xu\u1ea5t Thang M\u00e1ng C\u00e1p (Cable Tray, <\/strong><strong>Cable <\/strong><strong>Trunking)<\/strong><\/h2>\n<ul>\n<li><span style=\"font-size: 20px;\">\u0110\u1ecba ch\u1ec9: 180\/7b, \u1ea5p T\u00e2n Th\u1edbi 3, x\u00e3 T\u00e2n Hi\u1ec7p, huy\u1ec7n H\u00f3c M\u00f4n, TPHCM<\/span><\/li>\n<li><span style=\"font-size: 20px;\">\u0110i\u1ec7n Tho\u1ea1i: (028) 3713 3076 &#8211; 078 453 1668 &#8211; 0909 089 678<\/span><\/li>\n<li><span style=\"font-size: 20px;\">E-mail: sales@bestray<\/span><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Ti\u00eau chu\u1ea9n TCVN 4756:1989 v\u1ec1 n\u1ed1i \u0111\u1ea5t v\u00e0 n\u1ed1i kh\u00f4ng thi\u1ebft b\u1ecb \u0111i\u1ec7n \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng cho thi\u1ebft b\u1ecb \u0111i\u1ec7n m\u1ed9t chi\u1ec1u c\u00f3 gi\u00e1 tr\u1ecb \u0111i\u1ec7n \u00e1p l\u1edbn h\u01a1n 110V, v\u00e0 thi\u1ebft b\u1ecb \u0111i\u1ec7n xoay chi\u1ec1u c\u00f3 gi\u00e1 tr\u1ecb \u0111i\u1ec7n \u00e1p l\u1edbn h\u01a1n 42V. Ti\u00eau chu\u1ea9n n\u00e0y gi\u00fap cho vi\u1ec7c l\u1eafp \u0111\u1eb7t v\u00e0 s\u1eed d\u1ee5ng [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":3175,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[121],"tags":[269],"class_list":{"0":"post-2689","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-dien-cong-nghiep","8":"tag-tcvn"},"lang":"vi","translations":{"vi":2689},"pll_sync_post":[],"_links":{"self":[{"href":"https:\/\/bestray.com\/blog\/wp-json\/wp\/v2\/posts\/2689","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bestray.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bestray.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bestray.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/bestray.com\/blog\/wp-json\/wp\/v2\/comments?post=2689"}],"version-history":[{"count":6,"href":"https:\/\/bestray.com\/blog\/wp-json\/wp\/v2\/posts\/2689\/revisions"}],"predecessor-version":[{"id":5366,"href":"https:\/\/bestray.com\/blog\/wp-json\/wp\/v2\/posts\/2689\/revisions\/5366"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bestray.com\/blog\/wp-json\/wp\/v2\/media\/3175"}],"wp:attachment":[{"href":"https:\/\/bestray.com\/blog\/wp-json\/wp\/v2\/media?parent=2689"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bestray.com\/blog\/wp-json\/wp\/v2\/categories?post=2689"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bestray.com\/blog\/wp-json\/wp\/v2\/tags?post=2689"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}