What UL 1561 & UL 1562 Certification Means for Dry-Type Transformers<\/title>\n<meta name=\"description\" content=\"A grounded breakdown of the two UL standards that govern dry-type transformers \u2014 what each one actually covers, why the split is about voltage class rather than cooling medium, and what the mark does and does not promise.\">\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Sora:wght@300;400;500;600;700&family=DM+Serif+Display:ital@0;1&display=swap\" rel=\"stylesheet\">\n\n<style>\n:root {\n --hc-primary: #0A2540;\n --hc-accent: #E8A020;\n --hc-accent-light: #FFF4DE;\n --hc-teal: #1A7A6E;\n --hc-teal-light: #EAF6F4;\n --hc-text: #1C2B3A;\n --hc-text-muted: #5A7080;\n --hc-border: #D9E4EC;\n --hc-bg: #F7FAFC;\n --hc-white: #FFFFFF;\n --hc-rule: #C8D8E4;\n --hc-font-display: 'DM Serif Display', Georgia, serif;\n --hc-font-body: 'Sora', sans-serif;\n --hc-radius: 10px;\n --hc-shadow: 0 4px 24px rgba(10,37,64,0.09);\n --hc-shadow-hover: 0 8px 36px rgba(10,37,64,0.14);\n --hc-max-width: 860px;\n --hc-transition: 0.22s cubic-bezier(.4,0,.2,1);\n}\n\n.hc-article-wrap * { box-sizing: border-box; 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}\n\n\/* REFERENCES *\/\n.hc-references { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--hc-border); }\n.hc-references h5 { font-size: 11px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--hc-text-muted); margin-bottom: 12px; }\n.hc-references ul { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; }\n.hc-references ul li { font-size: 12px; color: var(--hc-text-muted); background: var(--hc-bg); border: 1px solid var(--hc-border); padding: 4px 12px; border-radius: 100px; }\n\n\/* NOTE BOX *\/\n.hc-note { font-size: 12.5px !important; color: var(--hc-text-muted) !important; background: var(--hc-bg); border: 1px solid var(--hc-border); border-radius: var(--hc-radius); padding: 14px 18px; margin-top: 18px; line-height: 1.7 !important; }\n\n\/* RESPONSIVE *\/\n@media (max-width: 640px) {\n .hc-hero { padding: 48px 20px 44px; }\n .hc-featured-image-wrap { padding: 0 16px; }\n .hc-article-body { padding: 16px 20px 48px; }\n .hc-obs-grid { grid-template-columns: 1fr; }\n .hc-stat-grid { grid-template-columns: repeat(2, 1fr); }\n .hc-table td:first-child { white-space: normal; }\n .hc-step-header { gap: 12px; }\n}\n<\/style>\n<\/head>\n\n<body>\n<div class=\"hc-article-wrap\">\n\n \n <header class=\"hc-hero\">\n <div class=\"hc-hero-inner\">\n <span class=\"hc-hero-eyebrow\">Resumo de Conformidade<\/span>\n <h1>O que significa a certifica\u00e7\u00e3o UL 1561 e UL 1562 para <em>Transformadores a seco<\/em><\/h1>\n <p class=\"hc-hero-lead\">Para um transformador a seco destinado ao mercado norte-americano, a certifica\u00e7\u00e3o UL raramente \u00e9 opcional. No entanto, as duas normas que regem as unidades a seco s\u00e3o frequentemente confundidas \u2014 e, ocasionalmente, rotuladas incorretamente. A diferen\u00e7a reside na classe de tens\u00e3o, e n\u00e3o no fluido de refrigera\u00e7\u00e3o.<\/p>\n <div class=\"hc-hero-meta\">\n <span class=\"hc-meta-tag\">\n <svg width=\"13\" height=\"13\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><circle cx=\"12\" cy=\"12\" r=\"10\"\/><polyline points=\"12 6 12 12 16 14\"\/><\/svg>\n 8 minutos de leitura\n <\/span>\n <span class=\"hc-meta-tag\">\n <svg width=\"13\" height=\"13\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M12 20h9\"\/><path d=\"M16.5 3.5a2.121 2.121 0 0 1 3 3L7 19l-4 1 1-4L16.5 3.5z\"\/><\/svg>\n Transformadores a seco\n <\/span>\n <span class=\"hc-meta-tag\">\n <svg width=\"13\" height=\"13\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M4 19.5A2.5 2.5 0 0 1 6.5 17H20\"\/><path d=\"M6.5 2H20v20H6.5A2.5 2.5 0 0 1 4 19.5v-15A2.5 2.5 0 0 1 6.5 2z\"\/><\/svg>\n Atualizado em setembro de 2026\n <\/span>\n <\/div>\n <\/div>\n <\/header>\n\n \n <div class=\"hc-featured-image-wrap\">\n <div class=\"hc-featured-image\" role=\"img\" aria-label=\"O que significam as certifica\u00e7\u00f5es UL 1561 e UL 1562 para transformadores a seco?\"><\/div>\n <p class=\"hc-image-caption\">Dois padr\u00f5es, uma fam\u00edlia de unidades a seco \u2014 divididos n\u00e3o pela forma como a unidade \u00e9 refrigerada, mas pela tens\u00e3o em que opera.<\/p>\n <\/div>\n\n \n <main class=\"hc-article-body\">\n\n \n <div class=\"hc-intro\">\n <p>A marca UL \u00e9 a abrevia\u00e7\u00e3o que um inspetor, um especificador e uma seguradora leem antes de qualquer outra coisa. No entanto, as duas normas que regem os transformadores a seco \u2014 UL 1561 e UL 1562 \u2014 s\u00e3o frequentemente confundidas e, ocasionalmente, rotuladas incorretamente. Compreender o que cada uma delas realmente abrange e o que a certifica\u00e7\u00e3o garante ou n\u00e3o \u00e9 o que diferencia uma especifica\u00e7\u00e3o aprovada na inspe\u00e7\u00e3o de uma que trava na obra.<\/p>\n <\/div>\n\n \n <section class=\"hc-section\">\n <div class=\"hc-section-label\"><span class=\"hc-section-num\">Resposta curta<\/span><div class=\"hc-section-rule\"><\/div><\/div>\n <h2>Uma fam\u00edlia de l\u00e2mpadas de tipo seco, dividida por voltagem.<\/h2>\n <p>Um erro persistente circula at\u00e9 mesmo na literatura dos fornecedores: a cren\u00e7a de que a norma UL 1561 abrange transformadores a seco, enquanto a UL 1562 abrange transformadores imersos em l\u00edquido. Isso est\u00e1 errado. <strong>Ambas as normas se aplicam a transformadores a seco.<\/strong> Nenhuma delas aborda unidades imersas em \u00f3leo ou preenchidas com l\u00edquido. O que as diferencia n\u00e3o \u00e9 o meio de refrigera\u00e7\u00e3o, mas sim o <strong>classe de tens\u00e3o<\/strong> \u2014 UL 1561 para a faixa de baixa tens\u00e3o, UL 1562 para a faixa de m\u00e9dia tens\u00e3o de 601 a 35.000 volts.<\/p>\n <div class=\"hc-stat-grid\">\n <div class=\"hc-stat-card\">\n <div class=\"hc-stat-num\"><span>UL 1561<\/span><\/div>\n <div class=\"hc-stat-label\">Unidades de baixa tens\u00e3o do tipo seco \u2014 unidades de uso geral e de pot\u00eancia para uso interno em edif\u00edcios<\/div>\n <\/div>\n <div class=\"hc-stat-card\">\n <div class=\"hc-stat-num\"><span>UL 1562<\/span><\/div>\n <div class=\"hc-stat-label\">Transformadores de distribui\u00e7\u00e3o a seco de m\u00e9dia tens\u00e3o<\/div>\n <\/div>\n <div class=\"hc-stat-card\">\n <div class=\"hc-stat-num\">601\u201335.000 <span>Em<\/span><\/div>\n <div class=\"hc-stat-label\">A faixa de tens\u00e3o que define o escopo da norma UL 1562.<\/div>\n <\/div>\n <div class=\"hc-stat-card\">\n <div class=\"hc-stat-num\"><span>Seco<\/span><\/div>\n <div class=\"hc-stat-label\">Ambas as normas \u2014 nenhuma unidade preenchida com l\u00edquido em nenhum dos escopos<\/div>\n <\/div>\n <\/div>\n <div class=\"hc-callout\">\n <p>Os dois padr\u00f5es n\u00e3o s\u00e3o alternativas entre as quais se deva escolher. <em>S\u00e3o dois segmentos de um mesmo cont\u00ednuo, divididos na fronteira onde termina a baixa tens\u00e3o e come\u00e7a a m\u00e9dia tens\u00e3o.<\/em><\/p>\n <\/div>\n <\/section>\n\n \n <section class=\"hc-section\">\n <div class=\"hc-section-label\"><span class=\"hc-section-num\">01\u201304<\/span><div class=\"hc-section-rule\"><\/div><\/div>\n <h2>O que cada norma realmente abrange<\/h2>\n <p>Analisamos os pontos na ordem em que costumam surgir em uma especifica\u00e7\u00e3o real \u2014 come\u00e7ando pela ideia equivocada que confunde as pessoas, depois o escopo de cada norma e, por fim, o que a certifica\u00e7\u00e3o realmente afirma.<\/p>\n\n <div class=\"hc-step-list\">\n\n <div class=\"hc-step-card\">\n <div class=\"hc-step-header\">\n <span class=\"hc-step-num\">1<\/span>\n <div class=\"hc-step-title\">O ponto mais mal compreendido<span>\u00c9 a voltagem, n\u00e3o o fluido de refrigera\u00e7\u00e3o.<\/span><\/div>\n <\/div>\n <div class=\"hc-step-body\">\n <p>Criar uma especifica\u00e7\u00e3o com base na cren\u00e7a de que a norma UL 1562 abrange transformadores imersos em l\u00edquido \u00e9 um convite a problemas. <strong>Tanto a UL 1561 quanto a UL 1562 pertencem inteiramente \u00e0 fam\u00edlia de normas para materiais secos.<\/strong> Nenhuma das duas aborda unidades imersas em \u00f3leo.<\/p>\n <p>O fator que os separa de forma confi\u00e1vel \u00e9 a tens\u00e3o de opera\u00e7\u00e3o: <strong>UL 1561<\/strong> controla unidades de baixa tens\u00e3o do tipo seco, <strong>UL 1562<\/strong> regula as unidades a seco de m\u00e9dia tens\u00e3o. Um transformador n\u00e3o escolhe entre os padr\u00f5es com base em como \u00e9 constru\u00eddo \u2014 ele se enquadra em um ou outro de acordo com sua posi\u00e7\u00e3o na escala de tens\u00e3o.<\/p>\n <div class=\"hc-winner-row\"><span class=\"hc-winner-tag depends\">Confirme a alega\u00e7\u00e3o em rela\u00e7\u00e3o ao escopo real.<\/span><\/div>\n <\/div>\n <\/div>\n\n <div class=\"hc-step-card\">\n <div class=\"hc-step-header\">\n <span class=\"hc-step-num\">2<\/span>\n <div class=\"hc-step-title\">UL 1561 \u2014 N\u00edvel de baixa tens\u00e3o<span>Unidades de uso geral e de pot\u00eancia<\/span><\/div>\n <\/div>\n <div class=\"hc-step-body\">\n <p>A norma UL 1561 abrange transformadores de uso geral e de pot\u00eancia dos tipos refrigerados a ar, secos, ventilados e n\u00e3o ventilados \u2014 os equipamentos essenciais para a distribui\u00e7\u00e3o di\u00e1ria em edif\u00edcios, reduzindo as tens\u00f5es para os n\u00edveis que alimentam pain\u00e9is, m\u00e1quinas e cargas em geral.<\/p>\n <p>Sua preocupa\u00e7\u00e3o \u00e9 a seguran\u00e7a da unidade f\u00edsica enquanto objeto instalado: <strong>Constru\u00e7\u00e3o da caixa, sistema de isolamento e classe t\u00e9rmica, rigidez diel\u00e9trica, aumento de temperatura sob carga e resist\u00eancia a tens\u00f5es el\u00e9tricas e mec\u00e2nicas.<\/strong> ao longo da vida \u00fatil. A certifica\u00e7\u00e3o UL 1561 informa ao mercado que uma unidade seca de baixa tens\u00e3o foi avaliada como um produto seguro e corretamente constru\u00eddo para instala\u00e7\u00e3o de acordo com o C\u00f3digo El\u00e9trico Nacional.<\/p>\n <div class=\"hc-winner-row\"><span class=\"hc-winner-tag dry\">Baixa tens\u00e3o<\/span><span class=\"hc-winner-tag depends\">NEC \/ ANSI-NFPA 70<\/span><\/div>\n <\/div>\n <\/div>\n\n <div class=\"hc-step-card\">\n <div class=\"hc-step-header\">\n <span class=\"hc-step-num\">3<\/span>\n <div class=\"hc-step-title\">UL 1562 \u2014 N\u00edvel de M\u00e9dia Tens\u00e3o<span>Distribui\u00e7\u00e3o, incluindo resina fundida<\/span><\/div>\n <\/div>\n <div class=\"hc-step-body\">\n <p>A norma UL 1562 d\u00e1 continuidade \u00e0 UL 1561. Seu escopo abrange transformadores de distribui\u00e7\u00e3o a seco monof\u00e1sicos e trif\u00e1sicos, com tens\u00e3o nominal prim\u00e1ria ou secund\u00e1ria. <strong>de 601 a 35.000 volts<\/strong>, com recintos ventilados ou n\u00e3o ventilados, e incluindo expressamente <strong>fundido em pe\u00e7a \u00fanica e encapsulado em resina<\/strong> constru\u00e7\u00f5es.<\/p>\n <p>A classe de alta tens\u00e3o \u00e9 o motivo da exist\u00eancia de uma norma separada \u2014 ela aumenta a import\u00e2ncia da coordena\u00e7\u00e3o do isolamento, do espa\u00e7amento diel\u00e9trico e da conten\u00e7\u00e3o de tens\u00f5es. A norma tamb\u00e9m estabelece limites expl\u00edcitos: transformadores de instrumentos, reguladores de tens\u00e3o, unidades de fornos a arco e retificadores, transformadores de minera\u00e7\u00e3o e equipamentos controlados por concession\u00e1rias de energia el\u00e9trica est\u00e3o todos fora dela. Essas exclus\u00f5es confirmam que se trata de uma norma para transformadores de distribui\u00e7\u00e3o, e n\u00e3o uma norma gen\u00e9rica para qualquer equipamento de m\u00e9dia tens\u00e3o.<\/p>\n <div class=\"hc-winner-row\"><span class=\"hc-winner-tag oil\">M\u00e9dia tens\u00e3o 601\u201335 kV<\/span><span class=\"hc-winner-tag dry\">Resina fundida inclu\u00edda<\/span><\/div>\n <\/div>\n <\/div>\n\n <div class=\"hc-step-card\">\n <div class=\"hc-step-header\">\n <span class=\"hc-step-num\">4<\/span>\n <div class=\"hc-step-title\">O que a marca promete<span>Seguran\u00e7a \u2014 n\u00e3o efici\u00eancia ou condicionamento f\u00edsico<\/span><\/div>\n <\/div>\n <div class=\"hc-step-body\">\n <p>A certifica\u00e7\u00e3o UL atesta que uma amostra representativa foi avaliada em rela\u00e7\u00e3o a um padr\u00e3o de seguran\u00e7a publicado e considerada em conformidade com o mesmo \u2014 constru\u00e7\u00e3o, isolamento e classe t\u00e9rmica, desempenho diel\u00e9trico e comportamento sob tens\u00e3o \u2014 e que, por meio de servi\u00e7os de acompanhamento, a produ\u00e7\u00e3o continua sendo verificada em rela\u00e7\u00e3o aos mesmos requisitos.<\/p>\n <p>O que faz <strong>n\u00e3o<\/strong> A afirma\u00e7\u00e3o \u00e9 igualmente importante. A marca \u00e9 uma avalia\u00e7\u00e3o de seguran\u00e7a, n\u00e3o uma declara\u00e7\u00e3o de efici\u00eancia, classifica\u00e7\u00e3o de desempenho ou adequa\u00e7\u00e3o a uma aplica\u00e7\u00e3o espec\u00edfica. Ela n\u00e3o classifica um transformador listado como melhor do que outro e n\u00e3o substitui o julgamento do especificador sobre carga, ambiente e regime de opera\u00e7\u00e3o.<\/p>\n <div class=\"hc-winner-row\"><span class=\"hc-winner-tag depends\">Seguro para instalar \u2260 adequado para o trabalho<\/span><\/div>\n <\/div>\n <\/div>\n\n <\/div>\n <\/section>\n\n \n <section class=\"hc-section\">\n <div class=\"hc-section-label\"><span class=\"hc-section-num\">05<\/span><div class=\"hc-section-rule\"><\/div><\/div>\n <h2>Refer\u00eancia r\u00e1pida lado a lado<\/h2>\n <p>As tecnologias de constru\u00e7\u00e3o se sobrep\u00f5em e o c\u00f3digo de instala\u00e7\u00e3o \u00e9 o mesmo. O limite de tens\u00e3o \u00e9 o \u00fanico fator que distingue com seguran\u00e7a os dois padr\u00f5es.<\/p>\n\n <div class=\"hc-table-wrap\">\n <table class=\"hc-table\">\n <thead>\n <tr>\n <th scope=\"col\">Aspecto<\/th>\n <th scope=\"col\">UL 1561<\/th>\n <th scope=\"col\">UL 1562<\/th>\n <\/tr>\n <\/thead>\n <tbody>\n <tr>\n <td>Tipo de transformador<\/td>\n <td>Tipo seco<\/td>\n <td>Tipo seco<\/td>\n <\/tr>\n <tr>\n <td>Classe de tens\u00e3o<\/td>\n <td>Baixa tens\u00e3o<\/td>\n <td>M\u00e9dia tens\u00e3o (601\u201335.000 V)<\/td>\n <\/tr>\n <tr>\n <td>Constru\u00e7\u00e3o t\u00edpica<\/td>\n <td>Refrigerado a ar, ventilado \/ n\u00e3o ventilado<\/td>\n <td>Ventiladas\/n\u00e3o ventiladas, incluindo moldadas in loco e encapsuladas em resina.<\/td>\n <\/tr>\n <tr>\n <td>Fun\u00e7\u00e3o t\u00edpica<\/td>\n <td>Distribui\u00e7\u00e3o geral de energia e para fins internos de edif\u00edcios<\/td>\n <td>Distribui\u00e7\u00e3o de m\u00e9dia tens\u00e3o<\/td>\n <\/tr>\n <tr>\n <td>Foco da avalia\u00e7\u00e3o<\/td>\n <td>Inv\u00f3lucro, classe de isolamento\/t\u00e9rmico, diel\u00e9trico, eleva\u00e7\u00e3o de temperatura<\/td>\n <td>Igualmente, calibrado para tens\u00e3o m\u00e9dia e coordena\u00e7\u00e3o de isolamento.<\/td>\n <\/tr>\n <tr>\n <td>Exclus\u00f5es not\u00e1veis<\/td>\n <td>Unidades especiais\/controladas por concession\u00e1rias de servi\u00e7os p\u00fablicos<\/td>\n <td>Instrumento, regulador, forno a arco, retificador, minera\u00e7\u00e3o, unidades de utilidade<\/td>\n <\/tr>\n <tr>\n <td>Refer\u00eancia de instala\u00e7\u00e3o<\/td>\n <td>C\u00f3digo El\u00e9trico Nacional (ANSI\/NFPA 70)<\/td>\n <td>C\u00f3digo El\u00e9trico Nacional (ANSI\/NFPA 70)<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n <p class=\"hc-note\">O fator decisivo \u00e9 sempre a tens\u00e3o nominal da unidade em quest\u00e3o \u2014 n\u00e3o o fluido refrigerante nem o m\u00e9todo de encapsulamento. Considere qualquer fonte que associe a norma UL 1562 a transformadores imersos em l\u00edquido como n\u00e3o confi\u00e1vel e confirme a certifica\u00e7\u00e3o comparando-a com a constru\u00e7\u00e3o e a classe de tens\u00e3o reais.<\/p>\n <\/section>\n\n \n <section class=\"hc-section\">\n <div class=\"hc-section-label\"><span class=\"hc-section-num\">06<\/span><div class=\"hc-section-rule\"><\/div><\/div>\n <h2>Perguntas frequentes<\/h2>\n <div class=\"hc-obs-grid\">\n <div class=\"hc-obs-card\">\n <div class=\"hc-obs-icon\">\ud83d\udee2\ufe0f<\/div>\n <h4>A norma UL 1562 abrange unidades preenchidas com l\u00edquido?<\/h4>\n <p>N\u00e3o \u2014 um erro comum e consequente. A norma UL 1562 abrange transformadores de distribui\u00e7\u00e3o a seco de m\u00e9dia tens\u00e3o, incluindo modelos com encapsulamento em resina, de 601 a 35.000 V. Ambas as normas se enquadram inteiramente na fam\u00edlia de transformadores a seco.<\/p>\n <\/div>\n <div class=\"hc-obs-card\">\n <div class=\"hc-obs-icon\">\u26a1<\/div>\n <h4>Qual \u00e9 a verdadeira diferen\u00e7a?<\/h4>\n <p>Classe de tens\u00e3o. A norma UL 1561 aplica-se a unidades de baixa tens\u00e3o do tipo seco; a norma UL 1562, a unidades de m\u00e9dia tens\u00e3o. As tecnologias de constru\u00e7\u00e3o e os c\u00f3digos de instala\u00e7\u00e3o se sobrep\u00f5em \u2014 a tens\u00e3o de opera\u00e7\u00e3o \u00e9 o que define a linha divis\u00f3ria.<\/p>\n <\/div>\n <div class=\"hc-obs-card\">\n <div class=\"hc-obs-icon\">\ud83e\uddf1<\/div>\n <h4>Que abrange unidades de resina fundida?<\/h4>\n <p>As constru\u00e7\u00f5es em resina fundida e encapsuladas em resina s\u00e3o mencionadas explicitamente na norma UL 1562, pois s\u00e3o caracter\u00edsticas de unidades de distribui\u00e7\u00e3o de m\u00e9dia tens\u00e3o. O que determina a tens\u00e3o nominal \u00e9 o fator determinante, e n\u00e3o o m\u00e9todo de encapsulamento.<\/p>\n <\/div>\n <div class=\"hc-obs-card\">\n <div class=\"hc-obs-icon\">\ud83d\udccb<\/div>\n <h4>Estar na lista significa maior efici\u00eancia?<\/h4>\n <p>N\u00e3o. A certifica\u00e7\u00e3o \u00e9 uma avalia\u00e7\u00e3o de seguran\u00e7a que abrange constru\u00e7\u00e3o, isolamento e desempenho diel\u00e9trico. Ela n\u00e3o classifica a efici\u00eancia nem ordena os produtos listados. A adequa\u00e7\u00e3o continua sendo uma quest\u00e3o \u00e0 parte do especificador.<\/p>\n <\/div>\n <\/div>\n <\/section>\n\n \n <div class=\"hc-cta-single\">\n <div class=\"hc-cta-card full\">\n <div class=\"hc-cta-copy\">\n <span class=\"hc-cta-eyebrow\">Conclus\u00e3o<\/span>\n <h3>Primeiro estabele\u00e7a a classe de tens\u00e3o \u2014 o padr\u00e3o vem a seguir.<\/h3>\n <p>Unidades a seco de baixa tens\u00e3o s\u00e3o regidas pela norma UL 1561; unidades a seco de m\u00e9dia tens\u00e3o, pela norma UL 1562. Considere qualquer fonte que associe a norma UL 1562 a transformadores imersos em l\u00edquido como n\u00e3o confi\u00e1vel, interprete a marca como uma avalia\u00e7\u00e3o de seguran\u00e7a e n\u00e3o como uma classifica\u00e7\u00e3o de desempenho, e mantenha a efici\u00eancia e a adequa\u00e7\u00e3o onde elas devem estar \u2014 nas especifica\u00e7\u00f5es que a certifica\u00e7\u00e3o nunca teve a inten\u00e7\u00e3o de substituir.<\/p>\n <\/div>\n <\/div>\n <\/div>\n\n \n <aside class=\"hc-references\">\n <h5>Normas e estruturas referenciadas<\/h5>\n <ul>\n <li>UL 1561 \u2014 Transformadores de pot\u00eancia e de uso geral do tipo seco<\/li>\n <li>UL 1562 \u2014 Transformadores de distribui\u00e7\u00e3o a seco de m\u00e9dia tens\u00e3o<\/li>\n <li>ANSI\/NFPA 70 \u2014 C\u00f3digo El\u00e9trico Nacional<\/li>\n <\/ul>\n <\/aside>\n\n <\/main>\n<\/div>\n<\/body>\n<\/html>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>What UL 1561 & UL 1562 Certification Means for Dry-Type Transformers Compliance Brief What UL 1561 & UL 1562 Certification Means for Dry-Type Transformers For a dry-type transformer entering the North American market, a UL mark is rarely optional. Yet the two standards that govern dry-type units are routinely confused \u2014 and occasionally mislabelled altogether. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1897","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/posts\/1897","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/comments?post=1897"}],"version-history":[{"count":4,"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/posts\/1897\/revisions"}],"predecessor-version":[{"id":1901,"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/posts\/1897\/revisions\/1901"}],"wp:attachment":[{"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/media?parent=1897"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/categories?post=1897"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/tags?post=1897"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

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\n\t\t\t\t\t\n\n\n\n\nWhat UL 1561 & UL 1562 Certification Means for Dry-Type Transformers<\/title>\n<meta name=\"description\" content=\"A grounded breakdown of the two UL standards that govern dry-type transformers \u2014 what each one actually covers, why the split is about voltage class rather than cooling medium, and what the mark does and does not promise.\">\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Sora:wght@300;400;500;600;700&family=DM+Serif+Display:ital@0;1&display=swap\" rel=\"stylesheet\">\n\n<style>\n:root {\n --hc-primary: #0A2540;\n --hc-accent: #E8A020;\n --hc-accent-light: #FFF4DE;\n --hc-teal: #1A7A6E;\n --hc-teal-light: #EAF6F4;\n --hc-text: #1C2B3A;\n --hc-text-muted: #5A7080;\n --hc-border: #D9E4EC;\n --hc-bg: #F7FAFC;\n --hc-white: #FFFFFF;\n --hc-rule: #C8D8E4;\n --hc-font-display: 'DM Serif Display', Georgia, serif;\n --hc-font-body: 'Sora', sans-serif;\n --hc-radius: 10px;\n --hc-shadow: 0 4px 24px rgba(10,37,64,0.09);\n --hc-shadow-hover: 0 8px 36px rgba(10,37,64,0.14);\n --hc-max-width: 860px;\n --hc-transition: 0.22s cubic-bezier(.4,0,.2,1);\n}\n\n.hc-article-wrap * { box-sizing: border-box; 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margin: 0 auto; padding: 0 32px; position: relative; top: -28px; margin-bottom: -8px; }\n.hc-featured-image {\n width: 100%; border-radius: var(--hc-radius); box-shadow: var(--hc-shadow-hover);\n display: block; aspect-ratio: 16\/6.4; border: 1px solid rgba(0,0,0,0.06);\n background: linear-gradient(120deg, #0A2540 0%, #123A5C 55%, #0E4A44 100%);\n background-image: url('https:\/\/haochengcompany.com\/wp-content\/uploads\/2026\/09\/What-UL-1561-UL-1562-Certification-Means-for-Dry-Type-Transformers.webp');\n background-size: cover;\n background-position: center;\n background-repeat: no-repeat;\n position: relative; overflow: hidden;\n}\n.hc-image-caption { font-size: 12px; color: var(--hc-text-muted); text-align: center; margin-top: 10px; font-style: italic; }\n\n\/* ARTICLE BODY *\/\n.hc-article-body { max-width: var(--hc-max-width); margin: 0 auto; padding: 20px 32px 64px; }\n\n\/* INTRO BLOCK *\/\n.hc-intro { border-left: 3px solid var(--hc-accent); padding: 18px 24px; margin-bottom: 40px; background: var(--hc-accent-light); border-radius: 0 var(--hc-radius) var(--hc-radius) 0; }\n.hc-intro p { font-size: 15.5px !important; color: #3A2800 !important; line-height: 1.78 !important; margin: 0 !important; }\n\n\/* SECTIONS *\/\n.hc-section { margin-bottom: 52px; }\n.hc-section-label { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }\n.hc-section-num { font-family: var(--hc-font-display); font-size: 13px; color: var(--hc-teal); font-style: italic; opacity: 0.7; }\n.hc-section-rule { flex: 1; height: 1px; background: var(--hc-rule); }\n.hc-section h2 { font-family: var(--hc-font-display); font-size: clamp(22px, 3vw, 30px); font-weight: 400; color: var(--hc-primary); line-height: 1.25; margin-bottom: 18px; letter-spacing: -0.01em; }\n.hc-section p { font-size: 15.5px; color: #374B5C; margin-bottom: 16px; line-height: 1.82; }\n.hc-section p strong { color: var(--hc-primary); }\n\n\/* CALLOUT *\/\n.hc-callout { background: var(--hc-primary); color: var(--hc-white); border-radius: var(--hc-radius); padding: 28px 30px; margin: 28px 0; position: relative; overflow: hidden; }\n.hc-callout::before { content: '\u275d'; position: absolute; top: -8px; right: 18px; font-size: 80px; font-family: Georgia, serif; color: rgba(232,160,32,0.18); line-height: 1; pointer-events: none; }\n.hc-callout p { font-family: var(--hc-font-display); font-size: 18px !important; font-style: italic; color: rgba(255,255,255,0.9) !important; line-height: 1.6 !important; margin: 0 !important; position: relative; z-index: 1; }\n.hc-callout p em { color: var(--hc-accent); font-style: normal; }\n\n\/* STEP CARDS *\/\n.hc-step-list { display: flex; flex-direction: column; gap: 20px; margin: 24px 0; }\n.hc-step-card { border: 1px solid var(--hc-border); border-radius: var(--hc-radius); overflow: hidden; box-shadow: 0 2px 8px rgba(10,37,64,0.05); transition: box-shadow var(--hc-transition); }\n.hc-step-card:hover { box-shadow: var(--hc-shadow); }\n.hc-step-header { display: flex; align-items: center; gap: 16px; padding: 16px 20px; background: var(--hc-primary); }\n.hc-step-num { font-family: var(--hc-font-display); font-size: 28px; font-weight: 400; color: var(--hc-accent); line-height: 1; flex-shrink: 0; }\n.hc-step-title { font-size: 14px; font-weight: 600; color: var(--hc-white); line-height: 1.3; }\n.hc-step-title span { display: block; font-size: 11px; font-weight: 400; color: rgba(255,255,255,0.5); margin-top: 2px; letter-spacing: 0.05em; text-transform: uppercase; }\n.hc-step-body { padding: 20px 22px; background: var(--hc-white); }\n.hc-step-body p { font-size: 14.5px !important; color: #374B5C !important; margin-bottom: 12px !important; line-height: 1.78 !important; }\n.hc-step-body p:last-child { margin-bottom: 0 !important; }\n.hc-step-body strong { color: var(--hc-primary); }\n\n\/* TAG ROW *\/\n.hc-winner-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 12px; }\n.hc-winner-tag { font-size: 11px; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; padding: 5px 12px; border-radius: 100px; display: inline-flex; align-items: center; gap: 6px; }\n.hc-winner-tag.dry { background: var(--hc-teal-light); color: var(--hc-teal); border: 1px solid rgba(26,122,110,0.35); }\n.hc-winner-tag.oil { background: var(--hc-accent-light); color: #8A5A00; border: 1px solid rgba(232,160,32,0.4); }\n.hc-winner-tag.depends { background: #EEF3F8; color: #4A7099; border: 1px solid rgba(10,37,64,0.15); }\n\n\/* TABLE *\/\n.hc-table-wrap { overflow-x: auto; margin: 28px 0; border-radius: var(--hc-radius); box-shadow: var(--hc-shadow); border: 1px solid var(--hc-border); }\n.hc-table { width: 100%; border-collapse: collapse; font-size: 14px; background: var(--hc-white); }\n.hc-table thead tr { background: var(--hc-primary); }\n.hc-table thead th { padding: 14px 18px; text-align: left; font-size: 12px; font-weight: 600; letter-spacing: 0.07em; text-transform: uppercase; color: rgba(255,255,255,0.85); white-space: nowrap; }\n.hc-table thead th:first-child { color: rgba(255,255,255,0.55); }\n.hc-table tbody tr { border-bottom: 1px solid var(--hc-border); transition: background var(--hc-transition); }\n.hc-table tbody tr:last-child { border-bottom: none; }\n.hc-table tbody tr:hover { background: #F0F7FA; }\n.hc-table td { padding: 13px 18px; vertical-align: top; line-height: 1.6; color: var(--hc-text); }\n.hc-table td:first-child { font-weight: 600; font-size: 13px; color: var(--hc-primary); white-space: nowrap; background: var(--hc-bg); border-right: 1px solid var(--hc-border); }\n\n\/* METRIC STAT ROW *\/\n.hc-stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin: 24px 0; }\n.hc-stat-card { text-align: center; border: 1px solid var(--hc-border); border-radius: var(--hc-radius); padding: 22px 16px; background: var(--hc-bg); }\n.hc-stat-num { font-family: var(--hc-font-display); font-size: 30px; color: var(--hc-primary); line-height: 1.1; margin-bottom: 6px; }\n.hc-stat-num span { color: var(--hc-teal); }\n.hc-stat-label { font-size: 12px; color: var(--hc-text-muted); letter-spacing: 0.02em; line-height: 1.5; }\n\n\/* OBSERVATIONS \/ FAQ GRID *\/\n.hc-obs-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin: 24px 0; }\n.hc-obs-card { border: 1px solid var(--hc-border); border-radius: var(--hc-radius); padding: 22px 20px; background: var(--hc-white); box-shadow: 0 2px 8px rgba(10,37,64,0.05); transition: box-shadow var(--hc-transition), border-color var(--hc-transition); }\n.hc-obs-card:hover { border-color: var(--hc-teal); box-shadow: var(--hc-shadow); }\n.hc-obs-icon { width: 40px; height: 40px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 18px; margin-bottom: 14px; background: var(--hc-teal-light); }\n.hc-obs-card h4 { font-size: 14px; font-weight: 700; color: var(--hc-primary); margin-bottom: 8px; }\n.hc-obs-card p { font-size: 13.5px !important; color: var(--hc-text-muted) !important; line-height: 1.68 !important; margin: 0 !important; }\n\n\/* TAKEAWAY CARD *\/\n.hc-cta-single { margin-top: 52px; }\n.hc-cta-card { border-radius: 12px; padding: 34px 32px; position: relative; overflow: hidden; }\n.hc-cta-card.full { background: linear-gradient(135deg, var(--hc-primary) 0%, #0E4A44 100%); }\n.hc-cta-card::before { content: ''; position: absolute; top: -50px; right: -50px; width: 220px; height: 220px; border-radius: 50%; background: radial-gradient(circle, rgba(232,160,32,0.18) 0%, transparent 70%); pointer-events: none; }\n.hc-cta-copy { position: relative; z-index: 1; max-width: 620px; }\n.hc-cta-eyebrow { font-size: 11px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--hc-accent); margin-bottom: 10px; display: block; }\n.hc-cta-card h3 { font-family: var(--hc-font-display); font-size: 23px; font-weight: 400; color: var(--hc-white); line-height: 1.3; margin-bottom: 10px; }\n.hc-cta-card p { font-size: 14px !important; color: rgba(255,255,255,0.68) !important; margin: 0 !important; line-height: 1.65 !important; }\n\n\/* REFERENCES *\/\n.hc-references { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--hc-border); }\n.hc-references h5 { font-size: 11px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--hc-text-muted); margin-bottom: 12px; }\n.hc-references ul { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; }\n.hc-references ul li { font-size: 12px; color: var(--hc-text-muted); background: var(--hc-bg); border: 1px solid var(--hc-border); padding: 4px 12px; border-radius: 100px; }\n\n\/* NOTE BOX *\/\n.hc-note { font-size: 12.5px !important; color: var(--hc-text-muted) !important; background: var(--hc-bg); border: 1px solid var(--hc-border); border-radius: var(--hc-radius); padding: 14px 18px; margin-top: 18px; line-height: 1.7 !important; }\n\n\/* RESPONSIVE *\/\n@media (max-width: 640px) {\n .hc-hero { padding: 48px 20px 44px; }\n .hc-featured-image-wrap { padding: 0 16px; }\n .hc-article-body { padding: 16px 20px 48px; }\n .hc-obs-grid { grid-template-columns: 1fr; }\n .hc-stat-grid { grid-template-columns: repeat(2, 1fr); }\n .hc-table td:first-child { white-space: normal; }\n .hc-step-header { gap: 12px; }\n}\n<\/style>\n<\/head>\n\n<body>\n<div class=\"hc-article-wrap\">\n\n \n <header class=\"hc-hero\">\n <div class=\"hc-hero-inner\">\n <span class=\"hc-hero-eyebrow\">Resumo de Conformidade<\/span>\n <h1>O que significa a certifica\u00e7\u00e3o UL 1561 e UL 1562 para <em>Transformadores a seco<\/em><\/h1>\n <p class=\"hc-hero-lead\">Para um transformador a seco destinado ao mercado norte-americano, a certifica\u00e7\u00e3o UL raramente \u00e9 opcional. No entanto, as duas normas que regem as unidades a seco s\u00e3o frequentemente confundidas \u2014 e, ocasionalmente, rotuladas incorretamente. A diferen\u00e7a reside na classe de tens\u00e3o, e n\u00e3o no fluido de refrigera\u00e7\u00e3o.<\/p>\n <div class=\"hc-hero-meta\">\n <span class=\"hc-meta-tag\">\n <svg width=\"13\" height=\"13\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><circle cx=\"12\" cy=\"12\" r=\"10\"\/><polyline points=\"12 6 12 12 16 14\"\/><\/svg>\n 8 minutos de leitura\n <\/span>\n <span class=\"hc-meta-tag\">\n <svg width=\"13\" height=\"13\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M12 20h9\"\/><path d=\"M16.5 3.5a2.121 2.121 0 0 1 3 3L7 19l-4 1 1-4L16.5 3.5z\"\/><\/svg>\n Transformadores a seco\n <\/span>\n <span class=\"hc-meta-tag\">\n <svg width=\"13\" height=\"13\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M4 19.5A2.5 2.5 0 0 1 6.5 17H20\"\/><path d=\"M6.5 2H20v20H6.5A2.5 2.5 0 0 1 4 19.5v-15A2.5 2.5 0 0 1 6.5 2z\"\/><\/svg>\n Atualizado em setembro de 2026\n <\/span>\n <\/div>\n <\/div>\n <\/header>\n\n \n <div class=\"hc-featured-image-wrap\">\n <div class=\"hc-featured-image\" role=\"img\" aria-label=\"O que significam as certifica\u00e7\u00f5es UL 1561 e UL 1562 para transformadores a seco?\"><\/div>\n <p class=\"hc-image-caption\">Dois padr\u00f5es, uma fam\u00edlia de unidades a seco \u2014 divididos n\u00e3o pela forma como a unidade \u00e9 refrigerada, mas pela tens\u00e3o em que opera.<\/p>\n <\/div>\n\n \n <main class=\"hc-article-body\">\n\n \n <div class=\"hc-intro\">\n <p>A marca UL \u00e9 a abrevia\u00e7\u00e3o que um inspetor, um especificador e uma seguradora leem antes de qualquer outra coisa. No entanto, as duas normas que regem os transformadores a seco \u2014 UL 1561 e UL 1562 \u2014 s\u00e3o frequentemente confundidas e, ocasionalmente, rotuladas incorretamente. Compreender o que cada uma delas realmente abrange e o que a certifica\u00e7\u00e3o garante ou n\u00e3o \u00e9 o que diferencia uma especifica\u00e7\u00e3o aprovada na inspe\u00e7\u00e3o de uma que trava na obra.<\/p>\n <\/div>\n\n \n <section class=\"hc-section\">\n <div class=\"hc-section-label\"><span class=\"hc-section-num\">Resposta curta<\/span><div class=\"hc-section-rule\"><\/div><\/div>\n <h2>Uma fam\u00edlia de l\u00e2mpadas de tipo seco, dividida por voltagem.<\/h2>\n <p>Um erro persistente circula at\u00e9 mesmo na literatura dos fornecedores: a cren\u00e7a de que a norma UL 1561 abrange transformadores a seco, enquanto a UL 1562 abrange transformadores imersos em l\u00edquido. Isso est\u00e1 errado. <strong>Ambas as normas se aplicam a transformadores a seco.<\/strong> Nenhuma delas aborda unidades imersas em \u00f3leo ou preenchidas com l\u00edquido. O que as diferencia n\u00e3o \u00e9 o meio de refrigera\u00e7\u00e3o, mas sim o <strong>classe de tens\u00e3o<\/strong> \u2014 UL 1561 para a faixa de baixa tens\u00e3o, UL 1562 para a faixa de m\u00e9dia tens\u00e3o de 601 a 35.000 volts.<\/p>\n <div class=\"hc-stat-grid\">\n <div class=\"hc-stat-card\">\n <div class=\"hc-stat-num\"><span>UL 1561<\/span><\/div>\n <div class=\"hc-stat-label\">Unidades de baixa tens\u00e3o do tipo seco \u2014 unidades de uso geral e de pot\u00eancia para uso interno em edif\u00edcios<\/div>\n <\/div>\n <div class=\"hc-stat-card\">\n <div class=\"hc-stat-num\"><span>UL 1562<\/span><\/div>\n <div class=\"hc-stat-label\">Transformadores de distribui\u00e7\u00e3o a seco de m\u00e9dia tens\u00e3o<\/div>\n <\/div>\n <div class=\"hc-stat-card\">\n <div class=\"hc-stat-num\">601\u201335.000 <span>Em<\/span><\/div>\n <div class=\"hc-stat-label\">A faixa de tens\u00e3o que define o escopo da norma UL 1562.<\/div>\n <\/div>\n <div class=\"hc-stat-card\">\n <div class=\"hc-stat-num\"><span>Seco<\/span><\/div>\n <div class=\"hc-stat-label\">Ambas as normas \u2014 nenhuma unidade preenchida com l\u00edquido em nenhum dos escopos<\/div>\n <\/div>\n <\/div>\n <div class=\"hc-callout\">\n <p>Os dois padr\u00f5es n\u00e3o s\u00e3o alternativas entre as quais se deva escolher. <em>S\u00e3o dois segmentos de um mesmo cont\u00ednuo, divididos na fronteira onde termina a baixa tens\u00e3o e come\u00e7a a m\u00e9dia tens\u00e3o.<\/em><\/p>\n <\/div>\n <\/section>\n\n \n <section class=\"hc-section\">\n <div class=\"hc-section-label\"><span class=\"hc-section-num\">01\u201304<\/span><div class=\"hc-section-rule\"><\/div><\/div>\n <h2>O que cada norma realmente abrange<\/h2>\n <p>Analisamos os pontos na ordem em que costumam surgir em uma especifica\u00e7\u00e3o real \u2014 come\u00e7ando pela ideia equivocada que confunde as pessoas, depois o escopo de cada norma e, por fim, o que a certifica\u00e7\u00e3o realmente afirma.<\/p>\n\n <div class=\"hc-step-list\">\n\n <div class=\"hc-step-card\">\n <div class=\"hc-step-header\">\n <span class=\"hc-step-num\">1<\/span>\n <div class=\"hc-step-title\">O ponto mais mal compreendido<span>\u00c9 a voltagem, n\u00e3o o fluido de refrigera\u00e7\u00e3o.<\/span><\/div>\n <\/div>\n <div class=\"hc-step-body\">\n <p>Criar uma especifica\u00e7\u00e3o com base na cren\u00e7a de que a norma UL 1562 abrange transformadores imersos em l\u00edquido \u00e9 um convite a problemas. <strong>Tanto a UL 1561 quanto a UL 1562 pertencem inteiramente \u00e0 fam\u00edlia de normas para materiais secos.<\/strong> Nenhuma das duas aborda unidades imersas em \u00f3leo.<\/p>\n <p>O fator que os separa de forma confi\u00e1vel \u00e9 a tens\u00e3o de opera\u00e7\u00e3o: <strong>UL 1561<\/strong> controla unidades de baixa tens\u00e3o do tipo seco, <strong>UL 1562<\/strong> regula as unidades a seco de m\u00e9dia tens\u00e3o. Um transformador n\u00e3o escolhe entre os padr\u00f5es com base em como \u00e9 constru\u00eddo \u2014 ele se enquadra em um ou outro de acordo com sua posi\u00e7\u00e3o na escala de tens\u00e3o.<\/p>\n <div class=\"hc-winner-row\"><span class=\"hc-winner-tag depends\">Confirme a alega\u00e7\u00e3o em rela\u00e7\u00e3o ao escopo real.<\/span><\/div>\n <\/div>\n <\/div>\n\n <div class=\"hc-step-card\">\n <div class=\"hc-step-header\">\n <span class=\"hc-step-num\">2<\/span>\n <div class=\"hc-step-title\">UL 1561 \u2014 N\u00edvel de baixa tens\u00e3o<span>Unidades de uso geral e de pot\u00eancia<\/span><\/div>\n <\/div>\n <div class=\"hc-step-body\">\n <p>A norma UL 1561 abrange transformadores de uso geral e de pot\u00eancia dos tipos refrigerados a ar, secos, ventilados e n\u00e3o ventilados \u2014 os equipamentos essenciais para a distribui\u00e7\u00e3o di\u00e1ria em edif\u00edcios, reduzindo as tens\u00f5es para os n\u00edveis que alimentam pain\u00e9is, m\u00e1quinas e cargas em geral.<\/p>\n <p>Sua preocupa\u00e7\u00e3o \u00e9 a seguran\u00e7a da unidade f\u00edsica enquanto objeto instalado: <strong>Constru\u00e7\u00e3o da caixa, sistema de isolamento e classe t\u00e9rmica, rigidez diel\u00e9trica, aumento de temperatura sob carga e resist\u00eancia a tens\u00f5es el\u00e9tricas e mec\u00e2nicas.<\/strong> ao longo da vida \u00fatil. A certifica\u00e7\u00e3o UL 1561 informa ao mercado que uma unidade seca de baixa tens\u00e3o foi avaliada como um produto seguro e corretamente constru\u00eddo para instala\u00e7\u00e3o de acordo com o C\u00f3digo El\u00e9trico Nacional.<\/p>\n <div class=\"hc-winner-row\"><span class=\"hc-winner-tag dry\">Baixa tens\u00e3o<\/span><span class=\"hc-winner-tag depends\">NEC \/ ANSI-NFPA 70<\/span><\/div>\n <\/div>\n <\/div>\n\n <div class=\"hc-step-card\">\n <div class=\"hc-step-header\">\n <span class=\"hc-step-num\">3<\/span>\n <div class=\"hc-step-title\">UL 1562 \u2014 N\u00edvel de M\u00e9dia Tens\u00e3o<span>Distribui\u00e7\u00e3o, incluindo resina fundida<\/span><\/div>\n <\/div>\n <div class=\"hc-step-body\">\n <p>A norma UL 1562 d\u00e1 continuidade \u00e0 UL 1561. Seu escopo abrange transformadores de distribui\u00e7\u00e3o a seco monof\u00e1sicos e trif\u00e1sicos, com tens\u00e3o nominal prim\u00e1ria ou secund\u00e1ria. <strong>de 601 a 35.000 volts<\/strong>, com recintos ventilados ou n\u00e3o ventilados, e incluindo expressamente <strong>fundido em pe\u00e7a \u00fanica e encapsulado em resina<\/strong> constru\u00e7\u00f5es.<\/p>\n <p>A classe de alta tens\u00e3o \u00e9 o motivo da exist\u00eancia de uma norma separada \u2014 ela aumenta a import\u00e2ncia da coordena\u00e7\u00e3o do isolamento, do espa\u00e7amento diel\u00e9trico e da conten\u00e7\u00e3o de tens\u00f5es. A norma tamb\u00e9m estabelece limites expl\u00edcitos: transformadores de instrumentos, reguladores de tens\u00e3o, unidades de fornos a arco e retificadores, transformadores de minera\u00e7\u00e3o e equipamentos controlados por concession\u00e1rias de energia el\u00e9trica est\u00e3o todos fora dela. Essas exclus\u00f5es confirmam que se trata de uma norma para transformadores de distribui\u00e7\u00e3o, e n\u00e3o uma norma gen\u00e9rica para qualquer equipamento de m\u00e9dia tens\u00e3o.<\/p>\n <div class=\"hc-winner-row\"><span class=\"hc-winner-tag oil\">M\u00e9dia tens\u00e3o 601\u201335 kV<\/span><span class=\"hc-winner-tag dry\">Resina fundida inclu\u00edda<\/span><\/div>\n <\/div>\n <\/div>\n\n <div class=\"hc-step-card\">\n <div class=\"hc-step-header\">\n <span class=\"hc-step-num\">4<\/span>\n <div class=\"hc-step-title\">O que a marca promete<span>Seguran\u00e7a \u2014 n\u00e3o efici\u00eancia ou condicionamento f\u00edsico<\/span><\/div>\n <\/div>\n <div class=\"hc-step-body\">\n <p>A certifica\u00e7\u00e3o UL atesta que uma amostra representativa foi avaliada em rela\u00e7\u00e3o a um padr\u00e3o de seguran\u00e7a publicado e considerada em conformidade com o mesmo \u2014 constru\u00e7\u00e3o, isolamento e classe t\u00e9rmica, desempenho diel\u00e9trico e comportamento sob tens\u00e3o \u2014 e que, por meio de servi\u00e7os de acompanhamento, a produ\u00e7\u00e3o continua sendo verificada em rela\u00e7\u00e3o aos mesmos requisitos.<\/p>\n <p>O que faz <strong>n\u00e3o<\/strong> A afirma\u00e7\u00e3o \u00e9 igualmente importante. A marca \u00e9 uma avalia\u00e7\u00e3o de seguran\u00e7a, n\u00e3o uma declara\u00e7\u00e3o de efici\u00eancia, classifica\u00e7\u00e3o de desempenho ou adequa\u00e7\u00e3o a uma aplica\u00e7\u00e3o espec\u00edfica. Ela n\u00e3o classifica um transformador listado como melhor do que outro e n\u00e3o substitui o julgamento do especificador sobre carga, ambiente e regime de opera\u00e7\u00e3o.<\/p>\n <div class=\"hc-winner-row\"><span class=\"hc-winner-tag depends\">Seguro para instalar \u2260 adequado para o trabalho<\/span><\/div>\n <\/div>\n <\/div>\n\n <\/div>\n <\/section>\n\n \n <section class=\"hc-section\">\n <div class=\"hc-section-label\"><span class=\"hc-section-num\">05<\/span><div class=\"hc-section-rule\"><\/div><\/div>\n <h2>Refer\u00eancia r\u00e1pida lado a lado<\/h2>\n <p>As tecnologias de constru\u00e7\u00e3o se sobrep\u00f5em e o c\u00f3digo de instala\u00e7\u00e3o \u00e9 o mesmo. O limite de tens\u00e3o \u00e9 o \u00fanico fator que distingue com seguran\u00e7a os dois padr\u00f5es.<\/p>\n\n <div class=\"hc-table-wrap\">\n <table class=\"hc-table\">\n <thead>\n <tr>\n <th scope=\"col\">Aspecto<\/th>\n <th scope=\"col\">UL 1561<\/th>\n <th scope=\"col\">UL 1562<\/th>\n <\/tr>\n <\/thead>\n <tbody>\n <tr>\n <td>Tipo de transformador<\/td>\n <td>Tipo seco<\/td>\n <td>Tipo seco<\/td>\n <\/tr>\n <tr>\n <td>Classe de tens\u00e3o<\/td>\n <td>Baixa tens\u00e3o<\/td>\n <td>M\u00e9dia tens\u00e3o (601\u201335.000 V)<\/td>\n <\/tr>\n <tr>\n <td>Constru\u00e7\u00e3o t\u00edpica<\/td>\n <td>Refrigerado a ar, ventilado \/ n\u00e3o ventilado<\/td>\n <td>Ventiladas\/n\u00e3o ventiladas, incluindo moldadas in loco e encapsuladas em resina.<\/td>\n <\/tr>\n <tr>\n <td>Fun\u00e7\u00e3o t\u00edpica<\/td>\n <td>Distribui\u00e7\u00e3o geral de energia e para fins internos de edif\u00edcios<\/td>\n <td>Distribui\u00e7\u00e3o de m\u00e9dia tens\u00e3o<\/td>\n <\/tr>\n <tr>\n <td>Foco da avalia\u00e7\u00e3o<\/td>\n <td>Inv\u00f3lucro, classe de isolamento\/t\u00e9rmico, diel\u00e9trico, eleva\u00e7\u00e3o de temperatura<\/td>\n <td>Igualmente, calibrado para tens\u00e3o m\u00e9dia e coordena\u00e7\u00e3o de isolamento.<\/td>\n <\/tr>\n <tr>\n <td>Exclus\u00f5es not\u00e1veis<\/td>\n <td>Unidades especiais\/controladas por concession\u00e1rias de servi\u00e7os p\u00fablicos<\/td>\n <td>Instrumento, regulador, forno a arco, retificador, minera\u00e7\u00e3o, unidades de utilidade<\/td>\n <\/tr>\n <tr>\n <td>Refer\u00eancia de instala\u00e7\u00e3o<\/td>\n <td>C\u00f3digo El\u00e9trico Nacional (ANSI\/NFPA 70)<\/td>\n <td>C\u00f3digo El\u00e9trico Nacional (ANSI\/NFPA 70)<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n <p class=\"hc-note\">O fator decisivo \u00e9 sempre a tens\u00e3o nominal da unidade em quest\u00e3o \u2014 n\u00e3o o fluido refrigerante nem o m\u00e9todo de encapsulamento. Considere qualquer fonte que associe a norma UL 1562 a transformadores imersos em l\u00edquido como n\u00e3o confi\u00e1vel e confirme a certifica\u00e7\u00e3o comparando-a com a constru\u00e7\u00e3o e a classe de tens\u00e3o reais.<\/p>\n <\/section>\n\n \n <section class=\"hc-section\">\n <div class=\"hc-section-label\"><span class=\"hc-section-num\">06<\/span><div class=\"hc-section-rule\"><\/div><\/div>\n <h2>Perguntas frequentes<\/h2>\n <div class=\"hc-obs-grid\">\n <div class=\"hc-obs-card\">\n <div class=\"hc-obs-icon\">\ud83d\udee2\ufe0f<\/div>\n <h4>A norma UL 1562 abrange unidades preenchidas com l\u00edquido?<\/h4>\n <p>N\u00e3o \u2014 um erro comum e consequente. A norma UL 1562 abrange transformadores de distribui\u00e7\u00e3o a seco de m\u00e9dia tens\u00e3o, incluindo modelos com encapsulamento em resina, de 601 a 35.000 V. Ambas as normas se enquadram inteiramente na fam\u00edlia de transformadores a seco.<\/p>\n <\/div>\n <div class=\"hc-obs-card\">\n <div class=\"hc-obs-icon\">\u26a1<\/div>\n <h4>Qual \u00e9 a verdadeira diferen\u00e7a?<\/h4>\n <p>Classe de tens\u00e3o. A norma UL 1561 aplica-se a unidades de baixa tens\u00e3o do tipo seco; a norma UL 1562, a unidades de m\u00e9dia tens\u00e3o. As tecnologias de constru\u00e7\u00e3o e os c\u00f3digos de instala\u00e7\u00e3o se sobrep\u00f5em \u2014 a tens\u00e3o de opera\u00e7\u00e3o \u00e9 o que define a linha divis\u00f3ria.<\/p>\n <\/div>\n <div class=\"hc-obs-card\">\n <div class=\"hc-obs-icon\">\ud83e\uddf1<\/div>\n <h4>Que abrange unidades de resina fundida?<\/h4>\n <p>As constru\u00e7\u00f5es em resina fundida e encapsuladas em resina s\u00e3o mencionadas explicitamente na norma UL 1562, pois s\u00e3o caracter\u00edsticas de unidades de distribui\u00e7\u00e3o de m\u00e9dia tens\u00e3o. O que determina a tens\u00e3o nominal \u00e9 o fator determinante, e n\u00e3o o m\u00e9todo de encapsulamento.<\/p>\n <\/div>\n <div class=\"hc-obs-card\">\n <div class=\"hc-obs-icon\">\ud83d\udccb<\/div>\n <h4>Estar na lista significa maior efici\u00eancia?<\/h4>\n <p>N\u00e3o. A certifica\u00e7\u00e3o \u00e9 uma avalia\u00e7\u00e3o de seguran\u00e7a que abrange constru\u00e7\u00e3o, isolamento e desempenho diel\u00e9trico. Ela n\u00e3o classifica a efici\u00eancia nem ordena os produtos listados. A adequa\u00e7\u00e3o continua sendo uma quest\u00e3o \u00e0 parte do especificador.<\/p>\n <\/div>\n <\/div>\n <\/section>\n\n \n <div class=\"hc-cta-single\">\n <div class=\"hc-cta-card full\">\n <div class=\"hc-cta-copy\">\n <span class=\"hc-cta-eyebrow\">Conclus\u00e3o<\/span>\n <h3>Primeiro estabele\u00e7a a classe de tens\u00e3o \u2014 o padr\u00e3o vem a seguir.<\/h3>\n <p>Unidades a seco de baixa tens\u00e3o s\u00e3o regidas pela norma UL 1561; unidades a seco de m\u00e9dia tens\u00e3o, pela norma UL 1562. Considere qualquer fonte que associe a norma UL 1562 a transformadores imersos em l\u00edquido como n\u00e3o confi\u00e1vel, interprete a marca como uma avalia\u00e7\u00e3o de seguran\u00e7a e n\u00e3o como uma classifica\u00e7\u00e3o de desempenho, e mantenha a efici\u00eancia e a adequa\u00e7\u00e3o onde elas devem estar \u2014 nas especifica\u00e7\u00f5es que a certifica\u00e7\u00e3o nunca teve a inten\u00e7\u00e3o de substituir.<\/p>\n <\/div>\n <\/div>\n <\/div>\n\n \n <aside class=\"hc-references\">\n <h5>Normas e estruturas referenciadas<\/h5>\n <ul>\n <li>UL 1561 \u2014 Transformadores de pot\u00eancia e de uso geral do tipo seco<\/li>\n <li>UL 1562 \u2014 Transformadores de distribui\u00e7\u00e3o a seco de m\u00e9dia tens\u00e3o<\/li>\n <li>ANSI\/NFPA 70 \u2014 C\u00f3digo El\u00e9trico Nacional<\/li>\n <\/ul>\n <\/aside>\n\n <\/main>\n<\/div>\n<\/body>\n<\/html>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>What UL 1561 & UL 1562 Certification Means for Dry-Type Transformers Compliance Brief What UL 1561 & UL 1562 Certification Means for Dry-Type Transformers For a dry-type transformer entering the North American market, a UL mark is rarely optional. Yet the two standards that govern dry-type units are routinely confused \u2014 and occasionally mislabelled altogether. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1897","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/posts\/1897","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/comments?post=1897"}],"version-history":[{"count":4,"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/posts\/1897\/revisions"}],"predecessor-version":[{"id":1901,"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/posts\/1897\/revisions\/1901"}],"wp:attachment":[{"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/media?parent=1897"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/categories?post=1897"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/haochengcompany.com\/pt\/wp-json\/wp\/v2\/tags?post=1897"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}