{"id":33938,"date":"2026-08-02T04:06:48","date_gmt":"2026-08-01T20:06:48","guid":{"rendered":"https:\/\/electricalcabinet.net\/?p=33938"},"modified":"2026-08-02T04:06:48","modified_gmt":"2026-08-01T20:06:48","slug":"nema-3r-vs-nema-4-enclosure","status":"publish","type":"post","link":"https:\/\/electricalcabinet.net\/pt\/nema-3r-vs-nema-4-enclosure\/","title":{"rendered":"NEMA 3R vs NEMA 4 Enclosure: Weather, Water, and Site Selection Inputs"},"content":{"rendered":"<h2><span class=\"ez-toc-section\" id=\"Define_the_water_exposure_first\"><\/span>Define the water exposure first<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The choice between NEMA 3R and NEMA 4 depends on the actual exposure, including rain, hose-directed water, washdown, drainage, dust, corrosion, mounting, and maintenance. Use the product construction and project specification to confirm the applicable designation.<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_80 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<div class=\"ez-toc-title ez-toc-toggle\" style=\"cursor:pointer\">\u00cdndice<\/div>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Alternar o \u00edndice\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Alternar<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/electricalcabinet.net\/pt\/nema-3r-vs-nema-4-enclosure\/#Define_the_water_exposure_first\" >Define the water exposure first<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/electricalcabinet.net\/pt\/nema-3r-vs-nema-4-enclosure\/#Selection_inputs\" >Selection inputs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/electricalcabinet.net\/pt\/nema-3r-vs-nema-4-enclosure\/#Scope_boundary\" >Scope boundary<\/a><\/li><\/ul><\/nav><\/div>\n\n<h2><span class=\"ez-toc-section\" id=\"Selection_inputs\"><\/span>Selection inputs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table>\n<thead>\n<tr>\n<th>Input<\/th>\n<th>Why it matters<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Rain and outdoor weather<\/td>\n<td>Supports 3R-type weather planning<\/td>\n<\/tr>\n<tr>\n<td>Hose or washdown exposure<\/td>\n<td>May require a different enclosure objective<\/td>\n<\/tr>\n<tr>\n<td>Dust and contaminants<\/td>\n<td>Affects seals, doors, and maintenance<\/td>\n<\/tr>\n<tr>\n<td>Material and corrosion<\/td>\n<td>Determines lifecycle suitability<\/td>\n<\/tr>\n<tr>\n<td>Cable entry and cooling<\/td>\n<td>Prevents weak points and overheating<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"Scope_boundary\"><\/span>Scope boundary<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>This comparison does not transfer a NEMA rating or certify an installation without configuration-specific evidence.<\/p>","protected":false},"excerpt":{"rendered":"<p>Compare NEMA 3R and NEMA 4 enclosure selection by rain, washdown, dust, corrosion, cable entry, cooling, and evidence.<\/p>","protected":false},"author":1,"featured_media":28328,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[435],"tags":[],"class_list":["post-33938","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electrical-enclosures"],"jetpack_featured_media_url":"https:\/\/electricalcabinet.net\/wp-content\/uploads\/2024\/05\/electrical-control-Cabinet-with-an-open-door.jpg","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/electricalcabinet.net\/pt\/wp-json\/wp\/v2\/posts\/33938","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/electricalcabinet.net\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/electricalcabinet.net\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/electricalcabinet.net\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/electricalcabinet.net\/pt\/wp-json\/wp\/v2\/comments?post=33938"}],"version-history":[{"count":1,"href":"https:\/\/electricalcabinet.net\/pt\/wp-json\/wp\/v2\/posts\/33938\/revisions"}],"predecessor-version":[{"id":33948,"href":"https:\/\/electricalcabinet.net\/pt\/wp-json\/wp\/v2\/posts\/33938\/revisions\/33948"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/electricalcabinet.net\/pt\/wp-json\/wp\/v2\/media\/28328"}],"wp:attachment":[{"href":"https:\/\/electricalcabinet.net\/pt\/wp-json\/wp\/v2\/media?parent=33938"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/electricalcabinet.net\/pt\/wp-json\/wp\/v2\/categories?post=33938"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/electricalcabinet.net\/pt\/wp-json\/wp\/v2\/tags?post=33938"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}