![\"\"](\"https:\/\/led.amasly.com\/wp-content\/uploads\/2024\/12\/Explosion-proof-junction-box.jpg\" "\\"Caixa")
<\/figure><\/div>\n\n\n\nI. Requisitos estruturais <\/p>\n\n\n\n
Nas superf\u00edcies de contacto, podem ser utilizadas juntas comprimidas para garantir a efic\u00e1cia da veda\u00e7\u00e3o do inv\u00f3lucro. Todas as juntas e veda\u00e7\u00f5es devem ter uma estrutura cont\u00ednua integral, ou seja, anular e ininterrupta. A estrutura do inv\u00f3lucro deve garantir a posi\u00e7\u00e3o correta das juntas. <\/p>\n\n\n\n
Se o grau de prote\u00e7\u00e3o do inv\u00f3lucro depender da junta na junta do inv\u00f3lucro e esta tiver de ser aberta durante a instala\u00e7\u00e3o ou manuten\u00e7\u00e3o, a junta deve ser aderida ou fixada mecanicamente a uma das superf\u00edcies de contacto para evitar perdas, danos ou instala\u00e7\u00e3o incorrecta. As superf\u00edcies de contacto que utilizam juntas n\u00e3o devem utilizar materiais vedantes adicionais como meio auxiliar para o desempenho da veda\u00e7\u00e3o. <\/p>\n\n\n\n
As dobradi\u00e7as n\u00e3o devem ser utilizadas como meio de manter a veda\u00e7\u00e3o, exceto nos casos em que a junta possa ser adequadamente comprimida sem causar movimentos inesperados, tens\u00e3o ou deforma\u00e7\u00e3o da junta. <\/p>\n\n\n\n
As veda\u00e7\u00f5es flex\u00edveis, como os foles, n\u00e3o devem ser sujeitas a tens\u00f5es excessivas em nenhum ponto. Devem ser tomadas medidas para evitar danos mec\u00e2nicos externos, e cada extremidade deve ser fixada mecanicamente. <\/p>\n\n\n\n
Nota: Os requisitos acima n\u00e3o se aplicam \u00e0s veda\u00e7\u00f5es no interior do dispositivo de entrada de cabos. <\/p>\n\n\n\n
II. Requisitos dos testes <\/p>\n\n\n\n
Ap\u00f3s a realiza\u00e7\u00e3o dos ensaios de inv\u00f3lucro em conformidade com os requisitos correspondentes, devem ser realizados ensaios de press\u00e3o em todas as amostras de ensaio, seguidos de ensaios de grau de prote\u00e7\u00e3o IP. <\/p>\n\n\n\n
A norma para \u201cAparelhos protegidos por inv\u00f3lucros \u00e0 prova de igni\u00e7\u00e3o de poeiras \u2018t'\u201d em ambientes explosivos acrescentou um requisito de ensaio de press\u00e3o para avaliar o efeito protetor das juntas e vedantes. Especificamente, a press\u00e3o interna deve ser de, pelo menos, (4 \u00b1 0,4) kPa (para o n\u00edvel de prote\u00e7\u00e3o \u2018ta\u2019) e (2 \u00b1 0,2) kPa (para os n\u00edveis de prote\u00e7\u00e3o \u2018tb\u2019 e \u2018tc\u2019), com uma dura\u00e7\u00e3o de 60 a 70 segundos. <\/p>\n\n\n\n
\u00c9 de notar que:<\/p>\n\n\n\n
(a) O dispositivo de introdu\u00e7\u00e3o dos cabos e os inv\u00f3lucros adicionais dos equipamentos Ex n\u00e3o necessitam de ser submetidos a ensaios de press\u00e3o, com exce\u00e7\u00e3o da junta de veda\u00e7\u00e3o que protege a superf\u00edcie da junta de instala\u00e7\u00e3o do dispositivo de introdu\u00e7\u00e3o e do inv\u00f3lucro; <\/p>\n\n\n\n
(b) Se a estrutura do equipamento Ex puder restringir o movimento das juntas e veda\u00e7\u00f5es, tais como an\u00e9is \u201cO\u201d em ranhuras ou juntas de veda\u00e7\u00e3o aderidas a um lado da superf\u00edcie da junta, n\u00e3o s\u00e3o necess\u00e1rios ensaios de press\u00e3o para equipamentos Ex com n\u00edveis de prote\u00e7\u00e3o \u201ctb\u201d e \u201ctc\u201d.<\/p>","protected":false},"excerpt":{"rendered":"
It is well known that the protective performance of the equipment enclosure protected by the dust-proof ignition-proof enclosure “t” is a key point that product design focuses on. Therefore, the structural rationality of the gaskets and seals that play a protective role is particularly important. I. Structural Requirements In the mating surfaces, compressed gaskets can […]<\/p>\n","protected":false},"author":1,"featured_media":1603,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","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":"disabled","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":"var(--ast-global-color-4)","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":[8],"tags":[],"class_list":["post-1602","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-explosion-proof-equipment"],"uagb_featured_image_src":{"full":["https:\/\/led.amasly.com\/wp-content\/uploads\/2024\/12\/Explosion-proof-junction-box.jpg",995,395,false],"thumbnail":["https:\/\/led.amasly.com\/wp-content\/uploads\/2024\/12\/Explosion-proof-junction-box-150x150.jpg",150,150,true],"medium":["https:\/\/led.amasly.com\/wp-content\/uploads\/2024\/12\/Explosion-proof-junction-box-300x119.jpg",300,119,true],"medium_large":["https:\/\/led.amasly.com\/wp-content\/uploads\/2024\/12\/Explosion-proof-junction-box-768x305.jpg",768,305,true],"large":["https:\/\/led.amasly.com\/wp-content\/uploads\/2024\/12\/Explosion-proof-junction-box.jpg",995,395,false],"1536x1536":["https:\/\/led.amasly.com\/wp-content\/uploads\/2024\/12\/Explosion-proof-junction-box.jpg",995,395,false],"2048x2048":["https:\/\/led.amasly.com\/wp-content\/uploads\/2024\/12\/Explosion-proof-junction-box.jpg",995,395,false],"trp-custom-language-flag":["https:\/\/led.amasly.com\/wp-content\/uploads\/2024\/12\/Explosion-proof-junction-box.jpg",18,7,false]},"uagb_author_info":{"display_name":"Joe","author_link":"https:\/\/led.amasly.com\/pt\/author\/jacklin\/"},"uagb_comment_info":0,"uagb_excerpt":"It is well known that the protective performance of the equipment enclosure protected by the dust-proof ignition-proof enclosure “t” is a key point that product design focuses on. Therefore, the structural rationality of the gaskets and seals that play a protective role is particularly important. I. Structural Requirements In the mating surfaces, compressed gaskets can…","_links":{"self":[{"href":"https:\/\/led.amasly.com\/pt\/wp-json\/wp\/v2\/posts\/1602","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/led.amasly.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/led.amasly.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/led.amasly.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/led.amasly.com\/pt\/wp-json\/wp\/v2\/comments?post=1602"}],"version-history":[{"count":1,"href":"https:\/\/led.amasly.com\/pt\/wp-json\/wp\/v2\/posts\/1602\/revisions"}],"predecessor-version":[{"id":1604,"href":"https:\/\/led.amasly.com\/pt\/wp-json\/wp\/v2\/posts\/1602\/revisions\/1604"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/led.amasly.com\/pt\/wp-json\/wp\/v2\/media\/1603"}],"wp:attachment":[{"href":"https:\/\/led.amasly.com\/pt\/wp-json\/wp\/v2\/media?parent=1602"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/led.amasly.com\/pt\/wp-json\/wp\/v2\/categories?post=1602"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/led.amasly.com\/pt\/wp-json\/wp\/v2\/tags?post=1602"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}