{"id":590,"date":"2024-08-26T18:07:06","date_gmt":"2024-08-26T16:07:06","guid":{"rendered":"https:\/\/gezhi-tech.com\/?p=590"},"modified":"2025-09-27T17:50:23","modified_gmt":"2025-09-27T15:50:23","slug":"clause-3-how-to-understand-the-definition-of-class-iii-construction","status":"publish","type":"post","link":"https:\/\/gezhi-tech.com\/vi\/clause-3-how-to-understand-the-definition-of-class-iii-construction\/","title":{"rendered":"Kho\u1ea3n 3 \u2013 C\u00e1ch hi\u1ec3u \u0111\u1ecbnh ngh\u0129a \u201cc\u00f4ng tr\u00ecnh c\u1ea5p III\u201d"},"content":{"rendered":"k\u1ebft c\u1ea5u c\u1ea5p III: b\u1ed9 ph\u1eadn c\u1ee7a thi\u1ebft b\u1ecb m\u00e0 vi\u1ec7c b\u1ea3o v\u1ec7 ch\u1ed1ng \u0111i\u1ec7n gi\u1eadt d\u1ef1a v\u00e0o \u0111i\u1ec7n \u00e1p c\u1ef1c th\u1ea5p an to\u00e0n v\u00e0 trong \u0111\u00f3 kh\u00f4ng t\u1ea1o ra \u0111i\u1ec7n \u00e1p cao h\u01a1n \u0111i\u1ec7n \u00e1p c\u1ef1c th\u1ea5p an to\u00e0n.
L\u01b0u \u00fd C\u00e1ch \u0111i\u1ec7n c\u01a1 b\u1ea3n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u b\u1ed5 sung cho ngu\u1ed3n \u0111i\u1ec7n \u1edf SELV. Tham kh\u1ea3o 8.1.4.
L\u01afU \u00dd 2 N\u1ebfu b\u1ed9 ph\u1eadn ch\u00ednh c\u1ee7a thi\u1ebft b\u1ecb ho\u1ea1t \u0111\u1ed9ng \u1edf SELV v\u00e0 \u0111\u01b0\u1ee3c cung c\u1ea5p c\u00f9ng v\u1edbi b\u1ed9 ngu\u1ed3n c\u00f3 th\u1ec3 th\u00e1o r\u1eddi th\u00ec b\u1ed9 ph\u1eadn ch\u00ednh n\u00e0y c\u1ee7a thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c coi l\u00e0 c\u00f3 k\u1ebft c\u1ea5u c\u1ea5p III trong thi\u1ebft b\u1ecb c\u1ea5p I ho\u1eb7c thi\u1ebft b\u1ecb c\u1ea5p II n\u1ebfu th\u00edch h\u1ee3p. <\/s><\/em>
\n\u1ede \u0111\u00e2y m\u1ed9t l\u1ea7n n\u1eefa, ng\u01b0\u1eddi ta nh\u1ea5n m\u1ea1nh v\u00e0o m\u1ed9t ph\u1ea7n c\u1ee7a thi\u1ebft b\u1ecb. Ch\u00fa th\u00edch 1 gi\u1ea3i th\u00edch ch\u1eb7t ch\u1ebd h\u01a1n, v\u00ec \u0111\u1ecbnh ngh\u0129a \u1edf \u0111\u00e2y quy \u0111\u1ecbnh \u0111i\u1ec7n \u00e1p c\u1ef1c th\u1ea5p an to\u00e0n, nh\u01b0ng \u0111i\u1ec7n \u00e1p c\u1ef1c th\u1ea5p an to\u00e0n ch\u1ec9 l\u00e0 b\u1ed9 ph\u1eadn c\u00f3 th\u1ec3 ch\u1ea1m t\u1edbi \u0111\u01b0\u1ee3c n\u1ebfu \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u \u1edf 8.1.4.
\n

\n\"\"
\n<\/figure>
\nThi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c c\u1ea5p ngu\u1ed3n b\u1eb1ng b\u1ed9 chuy\u1ec3n \u0111\u1ed5i c\u00f3 th\u1ec3 c\u1eafm \u0111\u01b0\u1ee3c (kh\u00f4ng c\u00f3 n\u1ed1i \u0111\u1ea5t b\u1ea3o v\u1ec7) v\u00e0 b\u1ed9 chuy\u1ec3n \u0111\u1ed5i v\u00e0 thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c cung c\u1ea5p c\u00f9ng nhau cho ng\u01b0\u1eddi d\u00f9ng. B\u1ed9 \u0111\u1ed5i ngu\u1ed3n v\u00e0 thi\u1ebft b\u1ecb c\u00f9ng \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 l\u00e0 thi\u1ebft b\u1ecb Lo\u1ea1i II. V\u00ec b\u1ed9 \u0111\u1ed5i ngu\u1ed3n l\u00e0 Lo\u1ea1i II n\u00ean \u0111i\u1ec1u n\u00e0y quy\u1ebft \u0111\u1ecbnh c\u1ea5p \u0111\u1ed9 b\u1ea3o v\u1ec7 ch\u1ed1ng \u0111i\u1ec7n gi\u1eadt. Tuy nhi\u00ean, ri\u00eang thi\u1ebft b\u1ecb – qu\u1ea1t l\u00e0 k\u1ebft c\u1ea5u C\u1ea5p III, t\u1ee9c l\u00e0 k\u1ebft c\u1ea5u C\u1ea5p III trong thi\u1ebft b\u1ecb C\u1ea5p II.
\n
\nT\u1ea5t nhi\u00ean, c\u00f3 m\u1ed9t t\u00ecnh hu\u1ed1ng kh\u00e1c, \u0111\u00f3 l\u00e0 PCB ngu\u1ed3n \u0111i\u1ec7n chuy\u1ec3n m\u1ea1ch \u0111\u01b0\u1ee3c nh\u00fang trong thi\u1ebft b\u1ecb v\u00e0 PCB ngu\u1ed3n \u0111i\u1ec7n chuy\u1ec3n m\u1ea1ch n\u00e0y c\u00f3 th\u1ec3 cung c\u1ea5p m\u1ea1ch SELV. Sau \u0111\u00f3, ph\u1ea7n m\u1ea1ch SELV c\u1ea5u th\u00e0nh c\u1ea5u tr\u00fac c\u1ea5p II.
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k\u1ebft c\u1ea5u c\u1ea5p III: b\u1ed9 ph\u1eadn c\u1ee7a thi\u1ebft b\u1ecb m\u00e0 vi\u1ec7c b\u1ea3o v\u1ec7 ch\u1ed1ng \u0111i\u1ec7n gi\u1eadt d\u1ef1a v\u00e0o \u0111i\u1ec7n \u00e1p c\u1ef1c th\u1ea5p an to\u00e0n v\u00e0 trong \u0111\u00f3 kh\u00f4ng t\u1ea1o ra \u0111i\u1ec7n \u00e1p cao h\u01a1n \u0111i\u1ec7n \u00e1p c\u1ef1c th\u1ea5p an to\u00e0n.L\u01b0u \u00fd C\u00e1ch \u0111i\u1ec7n c\u01a1 b\u1ea3n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u b\u1ed5 sung cho ngu\u1ed3n \u0111i\u1ec7n…<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[5],"tags":[74,83,86,90,163],"class_list":["post-590","post","type-post","status-publish","format-standard","hentry","category-terms-and-definitions","tag-insulation-applied-to-live-parts-to-provide-basic-protection-against-electric-shock","tag-appliance-in-which-protection-against-electric-shock-does-not-rely-on-basic-insulation-only-but-in-which-additional-safety-precautions-are-provided-such-as-double-insulation-or-reinforced-insulation","tag-part-of-an-appliance-for-which-protection-against-electric-shock-relies-upon-safety-extra-low-voltage-and-in-which-voltages-higher-than-those-of-safety-extra-low-voltage-are-not-generated","tag-voltage-not-exceeding-42-v-between-conductors-and-between-conductors-and-earth-or-functional-earth-the-no-load-voltage-not-exceeding-50-v","tag-selv"],"translation":{"provider":"WPGlobus","version":"3.0.1","language":"vi","enabled_languages":["en","es","ar","de","ja","fr","ru","th","nl","it","fa","ko","pt","hi","ro","tr","vi","id","zu"],"languages":{"en":{"title":true,"content":true,"excerpt":false},"es":{"title":true,"content":true,"excerpt":false},"ar":{"title":true,"content":true,"excerpt":false},"de":{"title":true,"content":true,"excerpt":false},"ja":{"title":true,"content":true,"excerpt":false},"fr":{"title":true,"content":true,"excerpt":false},"ru":{"title":true,"content":true,"excerpt":false},"th":{"title":true,"content":true,"excerpt":false},"nl":{"title":true,"content":true,"excerpt":false},"it":{"title":true,"content":true,"excerpt":false},"fa":{"title":true,"content":true,"excerpt":false},"ko":{"title":true,"content":true,"excerpt":false},"pt":{"title":true,"content":true,"excerpt":false},"hi":{"title":true,"content":true,"excerpt":false},"ro":{"title":true,"content":true,"excerpt":false},"tr":{"title":true,"content":true,"excerpt":false},"vi":{"title":true,"content":true,"excerpt":false},"id":{"title":true,"content":true,"excerpt":false},"zu":{"title":true,"content":true,"excerpt":false}}},"_links":{"self":[{"href":"https:\/\/gezhi-tech.com\/vi\/wp-json\/wp\/v2\/posts\/590","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gezhi-tech.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gezhi-tech.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gezhi-tech.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gezhi-tech.com\/vi\/wp-json\/wp\/v2\/comments?post=590"}],"version-history":[{"count":29,"href":"https:\/\/gezhi-tech.com\/vi\/wp-json\/wp\/v2\/posts\/590\/revisions"}],"predecessor-version":[{"id":1984,"href":"https:\/\/gezhi-tech.com\/vi\/wp-json\/wp\/v2\/posts\/590\/revisions\/1984"}],"wp:attachment":[{"href":"https:\/\/gezhi-tech.com\/vi\/wp-json\/wp\/v2\/media?parent=590"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gezhi-tech.com\/vi\/wp-json\/wp\/v2\/categories?post=590"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gezhi-tech.com\/vi\/wp-json\/wp\/v2\/tags?post=590"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}