{"id":7416,"date":"2026-08-21T18:14:59","date_gmt":"2026-08-21T18:14:59","guid":{"rendered":"https:\/\/gog-elec.com\/?p=7416"},"modified":"2026-08-21T18:15:01","modified_gmt":"2026-08-21T18:15:01","slug":"how-to-replace-a-light-switch-2","status":"publish","type":"post","link":"https:\/\/gog-elec.com\/pt\/blog\/how-to-replace-a-light-switch-2\/","title":{"rendered":"Como Substituir um Interruptor de Luz: Guia Passo a Passo para Cada Tipo"},"content":{"rendered":"<p>Se o seu interruptor antigo est\u00e1 quebrado, n\u00e3o funciona corretamente, ou se voc\u00ea simplesmente deseja atualizar para um modelo mais estiloso para sua cozinha, a substitui\u00e7\u00e3o do interruptor el\u00e9trico \u00e9 uma das tarefas de fa\u00e7a-voc\u00ea-mesmo mais gratificantes e f\u00e1ceis que voc\u00ea pode realizar. O processo em si \u00e9 r\u00e1pido e n\u00e3o custa mais do que alguns d\u00f3lares pelas pe\u00e7as envolvidas, mas voc\u00ea deve seguir os passos indicados se desejar ter sucesso. O guia a seguir explica todas as etapas necess\u00e1rias: prepara\u00e7\u00e3o, precau\u00e7\u00f5es de seguran\u00e7a, remo\u00e7\u00e3o e instala\u00e7\u00e3o adequadas, diferen\u00e7as entre os diferentes modelos de interruptores, danos comuns durante o processo e quando contratar um eletricista.<\/p>\n<blockquote><p>A resposta \u00e9 sim, voc\u00ea pode fazer a substitui\u00e7\u00e3o do interruptor de luz com suas pr\u00f3prias m\u00e3os \u2014 este n\u00e3o \u00e9 um trabalho dif\u00edcil para quem sabe trabalhar com cuidado: simplesmente desligue o disjuntor, teste se a voltagem est\u00e1 desligada, remova o interruptor antigo, tire uma foto da fia\u00e7\u00e3o, retire os fios, insira-os no novo interruptor na mesma ordem em que estavam no interruptor antigo. Caso voc\u00ea tenha um interruptor unipolar, n\u00e3o importa qual fio vai para onde; caso tenha um interruptor de tr\u00eas vias, o comum e os viajantes devem estar na mesma posi\u00e7\u00e3o que estavam antes.<\/p><\/blockquote>\n<h2>O que Preparar Antes de Come\u00e7ar<\/h2>\n<p>Certifique-se de confirmar tr\u00eas fatores antes de iniciar o trabalho:<\/p>\n<ul>\n<li>Garanta que o novo interruptor seja do mesmo tipo que o antigo; um interruptor unipolar deve ser substitu\u00eddo por outro unipolar ou um interruptor de tr\u00eas vias por outro de tr\u00eas vias (ou voc\u00ea precisar\u00e1 conhecer mais sobre a configura\u00e7\u00e3o do circuito).<\/li>\n<li>Certifique-se de que o novo interruptor caber\u00e1 na caixa el\u00e9trica de parede existente (observe que interruptores inteligentes e dimmers s\u00e3o maiores que interruptores convencionais e os interruptores t\u00eam aproximadamente 2,5 cm de profundidade).<\/li>\n<li>Confirme a localiza\u00e7\u00e3o do disjuntor (descubra qual circuito opera o interruptor com o qual voc\u00ea vai trabalhar e certifique-se de que est\u00e1 desligado).<\/li>\n<\/ul>\n<p>Al\u00e9m disso, considere se voc\u00ea est\u00e1 substituindo um interruptor por outro do mesmo tipo (substitui\u00e7\u00e3o id\u00eantica) ou se est\u00e1 atualizando um interruptor ou mudando de um interruptor simples para um dimmer ou interruptor inteligente (o que ter\u00e1 implica\u00e7\u00f5es na fia\u00e7\u00e3o, compatibilidade do dimmer\/carga e se voc\u00ea possui ou n\u00e3o um fio neutro).<\/p>\n<h2>A Lista Completa de Ferramentas<\/h2>\n<table>\n<thead>\n<tr>\n<th>Ferramenta<\/th>\n<th>Por que Voc\u00ea Precisa<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Testador de voltagem<\/strong> (sem contato ou mult\u00edmetro)<\/td>\n<td>A ferramenta mais importante \u2014 verificar se a energia est\u00e1 desligada<\/td>\n<\/tr>\n<tr>\n<td><strong>Chave de fenda de cabe\u00e7a chata<\/strong><\/td>\n<td>Remover os parafusos da placa de cobertura<\/td>\n<\/tr>\n<tr>\n<td><strong>Chave de fenda Phillips<\/strong><\/td>\n<td>A maioria dos parafusos dos terminais do interruptor<\/td>\n<\/tr>\n<tr>\n<td><strong>Decapador\/cortador de fios<\/strong><\/td>\n<td>Decapar e cortar fios, se necess\u00e1rio<\/td>\n<\/tr>\n<tr>\n<td><strong>Alicate de bico fino<\/strong><\/td>\n<td>Dobrar ganchos nos fios e puxar os fios<\/td>\n<\/tr>\n<tr>\n<td><strong>Telefone\/c\u00e2mera<\/strong><\/td>\n<td>Fotografar a fia\u00e7\u00e3o antes de desconectar<\/td>\n<\/tr>\n<tr>\n<td><strong>Lanterna<\/strong><\/td>\n<td>As caixas s\u00e3o escuras e rasas<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Esse \u00e9 o kit completo \u2014 n\u00e3o s\u00e3o necess\u00e1rias habilidades especiais ou ferramentas ex\u00f3ticas para uma substitui\u00e7\u00e3o b\u00e1sica.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7418\" src=\"https:\/\/gog-elec.com\/wp-content\/uploads\/2026\/08\/The-Rules-That-Never-Change.webp\" alt=\"The Rules That Never Change\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>Seguran\u00e7a em Primeiro Lugar: As Regras Que Nunca Mudam<\/h2>\n<ul>\n<li>Certifique-se de que o disjuntor est\u00e1 desligado \u2014 n\u00e3o apenas o interruptor. Identifique o interruptor no painel e desligue-o.<\/li>\n<li>Verifique se o circuito est\u00e1 inativo \u2014 use o testador de voltagem nos fios antes de toc\u00e1-los.<\/li>\n<li>Teste o dispositivo que pretende usar \u2014 certifique-se de que o testador funciona em uma tomada energizada antes de prosseguir.<\/li>\n<li>Use uma m\u00e3o sempre que poss\u00edvel dentro da caixa \u2014 isso mant\u00e9m a outra m\u00e3o afastada de superf\u00edcies aterradas.<\/li>\n<li>Se algo parecer incomum \u2014 por exemplo, se a isola\u00e7\u00e3o estiver queimada ou a caixa estiver presa, pare o trabalho e chame um eletricista.<\/li>\n<li>V\u00e1 com calma \u2014 a principal causa de erros na fia\u00e7\u00e3o \u00e9 n\u00e3o examinar adequadamente as representa\u00e7\u00f5es visuais.<\/li>\n<\/ul>\n<h2>Identifique Primeiro o Tipo do Seu Interruptor<\/h2>\n<p>Abra a placa frontal e observe a fia\u00e7\u00e3o antes de comprar qualquer coisa:<\/p>\n<table>\n<thead>\n<tr>\n<th>Tipo de Interruptor<\/th>\n<th>Como Reconhec\u00ea-lo<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>P\u00f3lo \u00fanico (SPST)<\/strong><\/td>\n<td>2 terminais de parafuso + terra; controla a luz de um \u00fanico local<\/td>\n<\/tr>\n<tr>\n<td><strong>3 vias<\/strong><\/td>\n<td>3 terminais de parafuso (comum + 2 viajantes) + terra; dois interruptores controlam uma luz<\/td>\n<\/tr>\n<tr>\n<td><strong>4 vias<\/strong><\/td>\n<td>4 terminais; tr\u00eas ou mais interruptores controlam uma luz<\/td>\n<\/tr>\n<tr>\n<td><strong>P\u00f3lo duplo (DPST)<\/strong><\/td>\n<td>4 terminais; comuta os dois condutores ativos de um circuito 240V<\/td>\n<\/tr>\n<tr>\n<td><strong>Dimmer<\/strong><\/td>\n<td>Normalmente 2 terminais + terra (ou 3 para dimmers 3 vias); bot\u00e3o\/deslizante\/pedal<\/td>\n<\/tr>\n<tr>\n<td><strong>Interruptor inteligente<\/strong><\/td>\n<td>Mesmos padr\u00f5es de terminais + conex\u00e3o neutra + antena\/fios<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Se estiver inseguro, conte os terminais e fotografe-os \u2014 essa foto guiar\u00e1 todo o trabalho. Em caso de d\u00favida sobre o que voc\u00ea tem, nosso guia para <a href=\"https:\/\/gog-elec.com\/pt\/blog\/what-are-the-four-types-of-light-switches\/\" rel=\"nofollow\">os quatro tipos de interruptores de luz<\/a> ajuda voc\u00ea a identific\u00e1-lo.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7419\" src=\"https:\/\/gog-elec.com\/wp-content\/uploads\/2026\/08\/Removing-the-Old-Switch.webp\" alt=\"Removendo o Interruptor Antigo\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>Removendo o Interruptor Antigo<\/h2>\n<p>When confirmed that there is no power:<\/p>\n<ul>\n<li>Remove the covering: there are usually one or two screws; remember where they are put.<\/li>\n<li>Take a photo of the wiring: this is the step that is skipped and which people regret later on; show which wire goes to which terminal.<\/li>\n<li>Take the switch out, loosening the screws on the top and the bottom of the switch (the screws are used to attach the switch); pull the switch body by the tabs.<\/li>\n<li>Identify the wires that the switch has: in the case of a single-pole switch, there are two wires attached to the brass terminals (line and load) and a ground (bare copper or green). There might be other wires in the box; the wires that are attached to the switch are the ones that are important.<\/li>\n<li>Disconnect the wires: loosen the screws and take off each wire. Make hooks straight, using pliers to help you.<\/li>\n<\/ul>\n<h2>Connecting the New Switch<\/h2>\n<p>For a regular single-pole switch (which is what most of us would be familiar with):<\/p>\n<ul>\n<li>Strip the wires if there is a need for it \u2014 approximately \u00bd to \u00be of an inch of bare copper wire (as was the case with the old switch).<\/li>\n<li>Make hooks \u2014 using pliers, bend every wire in the clockwise direction so that screws grab the wires when in the position of tightening.<\/li>\n<li>Join the two hot wires by connecting one of them to every brass terminal. The fact is that there is no right or wrong way to do this with a single-pole switch as with it you only have to open or close the circuit.<\/li>\n<li>Connect the ground wire \u2014 either bare copper wire or green wire should be connected with the green screw and if there is a pigtail ground, make sure to connect it there.<\/li>\n<li>Tighten screws well \u2014 they should not be loose; loose terminals are the main cause of overheating of switches.<\/li>\n<\/ul>\n<h2>Mounting &amp; Testing<\/h2>\n<ul>\n<li>Put the wires in the box in such a manner that they are folded neatly, not crammed in. Keep the switches flat in position.<\/li>\n<li>Fasten the switches onto the box using a top and bottom screw in a straight and tight way.<\/li>\n<li>Attach the faceplate to the switches.<\/li>\n<li>Switch on the power at the breaker.<\/li>\n<li>Test the switch; if it has worked properly, then 3-way testing should be performed at both locations. If it does not work, or the breaker trips, switch off the power and double check the wiring to ensure it has been done correctly.<\/li>\n<\/ul>\n<h2>How Each Switch Type Differs<\/h2>\n<ul>\n<li>Dimmer: same two terminals as a single-pole, but check load compatibility \u2014 LED dimmers must be LED-rated, and the total wattage must be within the dimmer&#8217;s rating. Our <a href=\"https:\/\/gog-elec.com\/pt\/blog\/led-dimmer-switch-compatibility\/\" rel=\"nofollow\">Guia de compatibilidade de dimmers LED<\/a> covers the matching logic.<\/li>\n<li>In the case of three-way switches, the common wire needs to be connected in the same manner as the wire used in the previous switch. Make sure you conduct tests in both locations after the installation.<\/li>\n<li>Smart switch: usually needs a neutral wire at the box (many modern boxes have one tucked behind) and a deeper box; some models need a hub. The <a href=\"https:\/\/gog-elec.com\/pt\/blog\/neutral-vs-non-neutral-smart-switches\/\" rel=\"nofollow\">neutral vs non-neutral smart switch guide<\/a> explains what to look for before buying.<\/li>\n<li>For four-way switches, the same steps would apply except there is a higher number of wires involved. It is best to first capture the images of the wires so that there are fewer chances for errors in reconnection.<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7420\" src=\"https:\/\/gog-elec.com\/wp-content\/uploads\/2026\/08\/Common-Mistakes-When-Changing-Switches.webp\" alt=\"Common Mistakes When Changing Switches\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>Common Mistakes When Changing Switches<\/h2>\n<table>\n<thead>\n<tr>\n<th>Erro<\/th>\n<th>Result<\/th>\n<th>Preven\u00e7\u00e3o<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Skipping the voltage test<\/td>\n<td>Shock risk<\/td>\n<td>Always verify dead with a tester<\/td>\n<\/tr>\n<tr>\n<td>No photo before disconnecting<\/td>\n<td>Wrong rewiring, confusion<\/td>\n<td>Photograph the wiring first<\/td>\n<\/tr>\n<tr>\n<td>Loose terminal screws<\/td>\n<td>Hot switch, arcing, fire risk<\/td>\n<td>Snug every screw<\/td>\n<\/tr>\n<tr>\n<td>Wire hooks backwards (counterclockwise)<\/td>\n<td>Wires pop off under the screw<\/td>\n<td>Bend hooks clockwise<\/td>\n<\/tr>\n<tr>\n<td>Buying the wrong type (single-pole vs 3-way)<\/td>\n<td>Won&#8217;t work or dangerous<\/td>\n<td>Count terminals before buying<\/td>\n<\/tr>\n<tr>\n<td>Smart switch without a neutral<\/td>\n<td>Won&#8217;t power up<\/td>\n<td>Check the box for neutral first<\/td>\n<\/tr>\n<tr>\n<td>Forgetting the 3-way common terminal<\/td>\n<td>Switch doesn&#8217;t work right<\/td>\n<td>Match the photo exactly<\/td>\n<\/tr>\n<tr>\n<td>Overcrowding the box<\/td>\n<td>Won&#8217;t fit, pinched wires<\/td>\n<td>Fold wires neatly; bigger box if needed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>When to Call an Electrician<\/h2>\n<p>If you notice any of the following cases, take a break and consult with someone who knows about it.<\/p>\n<ul>\n<li>Aluminum cables (silver wires marked AL) \u2013 require specific devices and installations.<\/li>\n<li>No earth wire in the metal box \u2013 with older systems, it is possible that grounding is non-existent.<\/li>\n<li>Burnt up insulation, black marks \u2013 indicative of a more serious issue.<\/li>\n<li>More wires than you anticipated or something that confuses you.<\/li>\n<li>Changing a 4-way switch or double-pole switch if you are in a state of doubt.<\/li>\n<li>If the breaker keeps tripping even after it has been changed, the issue is likely deeper than the switch.<\/li>\n<\/ul>\n<h2>Cost: DIY vs Electrician<\/h2>\n<table>\n<thead>\n<tr>\n<th>Item<\/th>\n<th>Custo<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Standard single-pole switch<\/td>\n<td>$2-$8<\/td>\n<\/tr>\n<tr>\n<td>Interruptor dimmer<\/td>\n<td>$10-$40<\/td>\n<\/tr>\n<tr>\n<td>Interruptor inteligente<\/td>\n<td>$15-$50<\/td>\n<\/tr>\n<tr>\n<td>Voltage tester (one-time)<\/td>\n<td>$10-$30<\/td>\n<\/tr>\n<tr>\n<td><strong>DIY total (typical)<\/strong><\/td>\n<td><strong>$2-$50 + 30 minutes<\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>Electrician call-out<\/strong><\/td>\n<td><strong>$75-$150<\/strong> (typically $50-75 labor + parts for a simple swap)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>It is evidently less costly to use the do-it-yourself (DIY) method for a basic repair; and with the safety measures noted, it is well worth the effort. However, for jobs which are slightly more complicated, hiring a certified electrician for anywhere between $75-150 can be worth the money.<\/p>\n<h2>Perguntas Frequentes<\/h2>\n<h3>Can I replace my light switch myself?<\/h3>\n<p>Indeed, changing a standard single-pole switch is something that anyone could do without prior experience. Just shut off the circuit and make sure the power is off, take a photo of the existing connections, remove the switch, connect the new switch (the color of the wire does not matter), and reinstall the switch plate. The entire process takes no more than 30 minutes and will cost $2 to $8. When it comes to 3-way switch or any other special devices or materials (such as aluminum wires or no ground), it is better to consult with a professional or read more about the working procedures.<\/p>\n<h3>What are the common mistakes when changing switches?<\/h3>\n<p>The important mistakes include: not taking a voltage reading, failing to take photos of the wiring before disconnecting, not tightening the terminal screws, making hooks twist counterclockwise, getting the wrong kind of switch and putting a smart switch where there is no neutral wire. On three-way switches, the error is reversing the common wire. However, taking a picture and bringing a manual with you is enough to guarantee that the mistakes won\u2019t happen.<\/p>\n<h3>How much would an electrician charge to change a light switch?<\/h3>\n<p>Generally, a simple replacement may cost between 75 and 150 USD. This amounts to the service call and\/or minimum charge (50-100 USD), in addition to some labor cost and the part defect (2-25 USD). More complicated situations require a lot more financing, e.g., 3-way and smart switch wiring where neutral is missing, old wiring. The cost of a do-it-yourself activity for the replacement may be 2-50 USD and it takes approximately 30 minutes, given that the wiring is done according to standard.<\/p>\n<h3>When replacing a light switch, which wire goes where?<\/h3>\n<p>In the case of a single-pole switch, the connections can be made using either hot wire; it makes no difference because the purpose of the switch is to either allow or prevent flow of electricity. The ground wire will always go to the green screw. However, in the case of a 3-way switch, the common wire should be connected to the COM terminal (often marked with a darker screw) and the two traveler wires should be connected to the other terminals. The position of switching terminal wires must match their previous positions exactly. In case you are not sure about any details, make sure to take a picture before removing the wires and use the wire stickers.<\/p>\n<h2>Refer\u00eancias<\/h2>\n<ol>\n<li><a href=\"https:\/\/www.nfpa.org\/codes-and-standards\/nfpa-70-standard-development\" rel=\"nofollow noopener\" target=\"_blank\">NFPA 70 (NEC) \u2014 Article 404 Switches, Installation Requirements<\/a><\/li>\n<li><a href=\"https:\/\/www.osha.gov\/electrical\" rel=\"nofollow noopener\" target=\"_blank\">OSHA \u2014 Electrical Safety for DIY and Workplace Tasks<\/a><\/li>\n<li><a href=\"https:\/\/www.ul.com\/\" rel=\"nofollow noopener\" target=\"_blank\">UL \u2014 UL 20 General-Use Snap Switches Standard<\/a><\/li>\n<li><a href=\"https:\/\/webstore.iec.ch\/\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60669 \u2014 Switches for Household and Similar Fixed Installations<\/a><\/li>\n<li><a href=\"https:\/\/www.leviton.com\/\" rel=\"nofollow noopener\" target=\"_blank\">Leviton \u2014 Switch Installation and Wiring Resources<\/a><\/li>\n<li><a href=\"https:\/\/www.angi.com\/\" rel=\"nofollow noopener\" target=\"_blank\">Angi \u2014 Electrician Pricing Guide for Switch Replacement<\/a><\/li>\n<\/ol>\n<h2>Conclus\u00e3o<\/h2>\n<p>One of the easiest occupations you may do around the house is to replace a light switch. This is done by gathering necessary tools, turning off the power, taking a picture of the wiring, removing the old switch and putting in the new one, making sure the positions of the 3-way switches and the grounding are the same. It costs $2-50 if you do it yourself or $75-150 if you hire an electrician, and the entire process will take about thirty minutes of your time. Despite that, the safety regulations must be complied with strictly, and the common mistakes you may encounter can be avoided.<\/p>","protected":false},"excerpt":{"rendered":"<p>If your old switch is broken, doesn&#8217;t function properly, or if you simply want to upgrade to a more stylish model for your kitchen, an electrical switch replacement is one of the most fulfilling and easiest DIY tasks you can do. The process itself is quick and doesn&#8217;t cost more than a few dollars for [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7417,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-7416","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/gog-elec.com\/pt\/wp-json\/wp\/v2\/posts\/7416","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gog-elec.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gog-elec.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gog-elec.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gog-elec.com\/pt\/wp-json\/wp\/v2\/comments?post=7416"}],"version-history":[{"count":2,"href":"https:\/\/gog-elec.com\/pt\/wp-json\/wp\/v2\/posts\/7416\/revisions"}],"predecessor-version":[{"id":7422,"href":"https:\/\/gog-elec.com\/pt\/wp-json\/wp\/v2\/posts\/7416\/revisions\/7422"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gog-elec.com\/pt\/wp-json\/wp\/v2\/media\/7417"}],"wp:attachment":[{"href":"https:\/\/gog-elec.com\/pt\/wp-json\/wp\/v2\/media?parent=7416"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gog-elec.com\/pt\/wp-json\/wp\/v2\/categories?post=7416"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gog-elec.com\/pt\/wp-json\/wp\/v2\/tags?post=7416"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}