{"id":77970,"date":"2017-04-09T23:57:58","date_gmt":"2017-04-09T21:57:58","guid":{"rendered":"https:\/\/coelectrix.com\/qual-a-amperagem-que-um-cabo-de-alimentacao-pode-suportar"},"modified":"2025-08-19T05:52:37","modified_gmt":"2025-08-19T03:52:37","slug":"qual-a-amperagem-que-um-cabo-de-alimentacao-pode-suportar","status":"publish","type":"post","link":"https:\/\/coelectrix.com\/pt-pt\/blog\/what-amperage-supports-an-electrical-cable","title":{"rendered":"Qual a amperagem que um cabo de alimenta\u00e7\u00e3o pode suportar"},"content":{"rendered":"\n<p><span style=\"font-family: helvetica, arial, sans-serif; font-size: 14pt; color: #000000;\">Bem, agora que ficou claro <strong>qual \u00e9 a sec\u00e7\u00e3o de um cabo el\u00e9trico,<\/strong> como medi-lo e saber o di\u00e2metro real (se n\u00e3o sabe, pode ler este post onde o explico).<\/span><\/p>\n\n<p><span style=\"color: #000000; font-family: helvetica, arial, sans-serif;\"><span style=\"font-size: 14pt;\">Clique nesta liga\u00e7\u00e3o para ver <\/span><span style=\"font-size: 14pt; color: #000080;\"><a style=\"color: #000080;\" href=\"http:\/\/www.coelectrix.com\/seccion-de-un-cable-electrico\">como saber a sec\u00e7\u00e3o transversal de um cabo el\u00e9trico<\/a><\/span><\/span><\/p>\n\n<h2 class=\"wp-block-heading\"><strong>Como saber a amperagem de um cabo de alimenta\u00e7\u00e3o<\/strong><\/h2>\n\n<p><span style=\"font-family: helvetica, arial, sans-serif; font-size: 14pt; color: #000000;\">Vamos ver <strong>como saber qual a amperagem que um cabo el\u00e9trico suporta<\/strong> de acordo com a sua sec\u00e7\u00e3o, para podermos calcular quais os cabos de que necessitamos quando montamos uma instala\u00e7\u00e3o el\u00e9ctrica.<\/span><\/p>\n\n<p><span style=\"font-family: helvetica, arial, sans-serif; font-size: 14pt; color: #000000;\">Tudo o que vou explicar est\u00e1 orientado para<strong> instala\u00e7\u00f5es de 12\/24v.<\/strong> e com cabos de cobre revestidos com PVC flex\u00edvel, conv\u00e9m esclarecer isto porque pode variar se estivermos a falar de 120\/240v. ou de cabos de alum\u00ednio, o que n\u00e3o \u00e9 o caso&#8230; mas vamos ao que interessa!<\/span><\/p>\n\n<p><span style=\"font-family: helvetica, arial, sans-serif; font-size: 14pt; color: #000000;\">Quando nos encontramos numa situa\u00e7\u00e3o em que temos de fazer uma instala\u00e7\u00e3o el\u00e9ctrica de raiz num carro, numa caravana, numa m\u00e1quina ou em qualquer outro aparelho, surge sempre a quest\u00e3o de saber se \u00e9 ou n\u00e3o necess\u00e1rio instal\u00e1-la:<\/span><\/p>\n\n<h3 class=\"wp-block-heading\"><strong>Que sec\u00e7\u00e3o de cabo devo utilizar? <\/strong><\/h3>\n\n<p><span style=\"font-family: helvetica, arial, sans-serif; font-size: 14pt; color: #000000;\">Bem, isso depende sempre da intensidade (amperes) que vai circular por ele.<\/span><\/p>\n\n<p><span style=\"font-family: helvetica, arial, sans-serif; font-size: 14pt; color: #000000;\">Aqui est\u00e1 a tabela onde se pode ver a corrente m\u00e1xima em fun\u00e7\u00e3o da sec\u00e7\u00e3o transversal do cabo de cobre.<\/span><\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><a href=\"https:\/\/coelectrix.com\/imagenes-del-post\"><img decoding=\"async\" width=\"150\" height=\"300\" src=\"https:\/\/coelectrix.com\/wp-content\/uploads\/2017\/04\/intensidad-de-un-cable-150x300.jpg\" alt=\"corrente de um cabo\" class=\"wp-image-2026\" srcset=\"https:\/\/coelectrix.com\/wp-content\/uploads\/2017\/04\/intensidad-de-un-cable.jpg 150w, https:\/\/coelectrix.com\/wp-content\/uploads\/2017\/04\/intensidad-de-un-cable-64x128.jpg 64w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/a><\/figure>\n<\/div>\n<figure class=\"wp-block-image aligncenter size-full\"><a href=\"https:\/\/coelectrix.com\/pt-pt\/cabo-eletrico\"><img decoding=\"async\" class=\"solo-pc\" src=\"https:\/\/coelectrix.com\/wp-content\/uploads\/2017\/01\/Banner-Coelectrix-Cables-electricos.jpg\" alt=\"Comprar cables el\u00e9ctricos\"\/><\/a><\/figure>\n\n<figure class=\"wp-block-image aligncenter size-full\"><a href=\"https:\/\/coelectrix.com\/pt-pt\/cabo-eletrico\"><img decoding=\"async\" class=\"solo-movil\" src=\"https:\/\/coelectrix.com\/wp-content\/uploads\/2017\/01\/Responsive-Banner-Cables-electricos-Coelectrix.jpg\" alt=\"\"\/><\/a><\/figure>\n\n<p><span style=\"font-family: helvetica, arial, sans-serif; font-size: 14pt; color: #000000;\">Como j\u00e1 referi, esta tabela indica os <strong>valores m\u00e1ximos suportados por cada sec\u00e7\u00e3o de cabo.<\/strong><\/span><\/p>\n\n<p><span style=\"font-family: helvetica, arial, sans-serif; font-size: 14pt; color: #000000;\">Isto significa que devemos ter sempre um pouco mais de sec\u00e7\u00e3o para evitar perdas de tens\u00e3o e sobreaquecimento nos cabos.<\/span><\/p>\n\n<p><span style=\"font-family: helvetica, arial, sans-serif; font-size: 14pt; color: #000000;\">\u00c9 tamb\u00e9m de salientar que, para al\u00e9m disso, os valores apresentados nesta tabela s\u00e3o calculados com um cabo de cobre flex\u00edvel com bainha de PVC ao ar.<\/span><\/p>\n\n<p><span style=\"font-family: helvetica, arial, sans-serif; font-size: 14pt; color: #000000;\">Isto significa que, se o(s) cabo(s) for(em) tubular(es), fixado(s) com fita adesiva, num bloco de terminais ou enterrado(s), o sobreaquecimento ser\u00e1 maior e a sec\u00e7\u00e3o transversal do cabo ter\u00e1 de ser aumentada para evitar o sobreaquecimento ou mesmo a combust\u00e3o.<\/span><\/p>\n\n<p><span style=\"font-family: helvetica, arial, sans-serif; font-size: 14pt; color: #000000;\">Outro aspeto a ter em conta \u00e9 o comprimento final da instala\u00e7\u00e3o, porque quanto mais longa for a instala\u00e7\u00e3o, maior ser\u00e1 a perda de tens\u00e3o.<\/span><\/p>\n\n<h3 class=\"wp-block-heading\"><strong>Conclus\u00e3o final sobre a amperagem do cabo de alimenta\u00e7\u00e3o<\/strong><\/h3>\n\n<p><span style=\"font-size: 14pt; color: #000000; font-family: helvetica, arial, sans-serif;\">Quando temos de escolher <strong>a sec\u00e7\u00e3o de cabo a instalar numa instala\u00e7\u00e3o el\u00e9ctrica<\/strong>, em primeiro lugar temos de saber a intensidade em Amperes que vai circular por eles e verificaremos na tabela <strong>qual \u00e9 a sec\u00e7\u00e3o de cabo<\/strong> que melhor se adapta \u00e0s nossas necessidades e teremos em conta o comprimento final que a instala\u00e7\u00e3o ter\u00e1 e se os cabos ser\u00e3o livres ou tubulares.<\/span><\/p>\n\n<p><span style=\"font-family: helvetica, arial, sans-serif; font-size: 14pt; color: #000000;\">O habitual, e o que aconselhamos, \u00e9 que, se virmos que estamos a correr demasiado baixo, por precau\u00e7\u00e3o e sempre que poss\u00edvel, subamos<strong> um n\u00edvel na tabela de sec\u00e7\u00f5es.<\/strong> N\u00e3o far\u00e1 mal nenhum \ud83d\ude09<\/span><\/p>\n\n<p class=\"has-text-align-center\"><span style=\"font-size: 14pt; color: #000000; font-family: helvetica, arial, sans-serif;\"><strong>Pode visitar a nossa <span style=\"color: #000080;\"><a style=\"color: #000080;\" href=\"https:\/\/www.coelectrix.com\/cable-electrico\">loja de cabos online<\/a><\/span> e ver todos os produtos que temos para lhe oferecer<\/strong><\/span><\/p>\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><span style=\"font-size: 14pt; color: #000000; font-family: helvetica, arial, sans-serif;\"><strong><em>Perguntas frequentes que recebemos, raz\u00e3o pela qual decidi escrever este post:<\/em><\/strong><\/span><\/p><\/blockquote>\n\n<h3 class=\"wp-block-heading\"><span style=\"font-family: helvetica, arial, sans-serif; color: #000000;\">Qual \u00e9 a amperagem de um cabo de 4 mm?<\/span><\/h3>\n\n<h3 class=\"wp-block-heading\"><span style=\"font-family: helvetica, arial, sans-serif; color: #000000;\">Quantos amperes suporta um cabo de 16 mm2?<\/span><\/h3>\n\n<h3 class=\"wp-block-heading\"><span style=\"font-family: helvetica, arial, sans-serif; color: #000000;\">Que amperagem \u00e9 suportada por um cabo de 2,5 mm?<\/span><\/h3>\n\n<h3 class=\"wp-block-heading\"><span style=\"font-family: helvetica, arial, sans-serif; color: #000000;\">Qual \u00e9 a amperagem nominal dos cabos?<\/span><\/h3>\n\n<h3 class=\"wp-block-heading\"><span style=\"font-family: helvetica, arial, sans-serif; color: #000000;\">Corrente m\u00e1xima do cabo de 2,5 mm2?<\/span><\/h3>\n\n<h3 class=\"wp-block-heading\"><span style=\"font-family: helvetica, arial, sans-serif; color: #000000;\">Tem uma tabela de sec\u00e7\u00e3o transversal-fio-ampere?<\/span><\/h3>\n\n<p><span style=\"color: #000000;\">Espero que todas as respostas estejam l\u00e1.<\/span><\/p>\n\n<p><span style=\"font-size: 14pt;\"><strong>Tamb\u00e9m pode estar interessado em&#8230;<\/strong><\/span><\/p>\n\n<p><img decoding=\"async\" class=\"alignnone wp-image-4348\" src=\"https:\/\/www.coelectrix.com\/wp-content\/uploads\/2017\/11\/portafusibles-aereo.png\" alt=\"\" width=\"104\" height=\"85\" srcset=\"https:\/\/coelectrix.com\/wp-content\/uploads\/2017\/11\/portafusibles-aereo.png 294w, https:\/\/coelectrix.com\/wp-content\/uploads\/2017\/11\/portafusibles-aereo-64x53.png 64w\" sizes=\"(max-width: 104px) 100vw, 104px\" \/><span style=\"font-size: 14pt;\">Esta publica\u00e7\u00e3o, na qual falamos de <a href=\"https:\/\/www.coelectrix.com\/portafusibles\">suportes de fus\u00edveis<\/a><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Bem, agora que ficou claro qual \u00e9 a sec\u00e7\u00e3o de um cabo el\u00e9trico, como medi-lo e saber o di\u00e2metro real (se n\u00e3o sabe, pode ler este post onde o explico). Clique nesta liga\u00e7\u00e3o para ver como saber a sec\u00e7\u00e3o transversal de um cabo el\u00e9trico Como saber a amperagem de um cabo de alimenta\u00e7\u00e3o Vamos ver [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":72795,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1451,1448],"tags":[],"class_list":["post-77970","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cabos-electricos","category-instalaciones-pt-pt"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Que amperagem pode suportar um cabo de alimenta\u00e7\u00e3o?<\/title>\n<meta name=\"description\" content=\"Qual a amperagem que um cabo de alimenta\u00e7\u00e3o pode suportar | A resposta e uma tabela de convers\u00e3o para escolher a sec\u00e7\u00e3o 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