{"id":4652,"date":"2026-05-30T20:19:08","date_gmt":"2026-05-30T17:19:08","guid":{"rendered":"https:\/\/aesinn.com\/?p=4652"},"modified":"2026-07-18T19:01:43","modified_gmt":"2026-07-18T16:01:43","slug":"topraklama-direnci-kac-ohm-olmali","status":"publish","type":"post","link":"https:\/\/aesinn.com\/en\/topraklama-direnci-kac-ohm-olmali\/","title":{"rendered":"What should the grounding resistance be in Ohms? Limit Values."},"content":{"rendered":"<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>Short answer:<\/strong> What should the grounding resistance be in ohms? <strong>It is not a single constant value<\/strong>; This varies depending on the system type (TT, TN), the protective device, and the purpose of the installation. Generally accepted references: for lightning protection (lightning rod) grounding. <strong>\u2264 10 ohm<\/strong>, In systems protected by residual current devices (RCDs), this value ensures that the touch voltage remains below 50 V.<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">\u201c&quot;What should my grounding resistance be in ohms?&quot; is one of the most frequently asked, yet most misunderstood, questions. There&#039;s no single magic number; the value depends on the type of installation and the type of protection it provides.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Reference Values According to System and Purpose<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>APPLICATION<\/th><th>Common target value<\/th><\/tr><\/thead><tbody><tr><td>Lightning protection (lightning rod)<\/td><td>\u2264 10 ohm<\/td><\/tr><tr><td>RCD system (TT)<\/td><td>R<sub>A<\/sub> According to the rule \u00d7 I\u0394n \u2264 50 V<\/td><\/tr><tr><td>Plant\/system grounding<\/td><td>According to regulations and design<\/td><\/tr><tr><td>Sensitive electronics \/ data center<\/td><td>Usually much lower (\u2264 1-2 ohms)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">RCD Rule: 50V Limit<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In grounding systems protected by residual current devices (RCDs), the basic rule is: grounding resistance (R<sub>A<\/sub>The product of the voltage (V) and the relay&#039;s rated leakage current (I\u0394n) must remain below the allowable touch voltage (usually 50 V). That is to say... <strong>R<sub>A<\/sub> \u00d7 I\u0394n \u2264 50 V<\/strong>. While this theoretically allows for high resistance with a low leakage current (e.g., 30 mA) relay, in practice much lower values are targeted for safety and continuity.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Isn&#039;t There a Single Value?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Because the function of grounding varies depending on the system: discharging lightning, carrying fault current to the relay, or filtering noise are different requirements. The exact target value is...; <strong>Regulations on Grounding in Electrical Installations<\/strong> And within the framework of relevant standards, it is determined according to the design of the installation. Therefore, correctly interpreting the measurement result is as important as taking the measurement itself.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For accurate measurement and for the results to be interpreted and reported in accordance with regulations. <a href=\"https:\/\/aesinn.com\/en\/topraklama-sistemleri\/topraklama-tesisati-periyodik-muayeneleri\/\">periodic inspection of grounding system<\/a> You can benefit from our service.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently Asked Questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">My reading came back high, what should I do?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The number\/depth of grounding electrodes can be increased, connections and corrosion can be checked, or soil improvement solutions can be applied; measurement and evaluation determine the correct action.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For accredited grounding measurements. <a href=\"https:\/\/aesinn.com\/en\/topraklama-sistemleri\/\">Our Grounding Systems Services<\/a> Examine it.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\"><div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/aesinn.com\/en\/iletisim\/\">Get a free quote \u00bb<\/a><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Short answer: The required grounding resistance in ohms is not a single fixed value; it depends on the system type (TT, TN), the protective device, and\u2026<\/p>","protected":false},"author":1,"featured_media":2568,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","slim_seo":{"title":"What should the grounding resistance be in Ohms? Limit Values.","description":"What should the grounding resistance be in ohms? Regulations specify limit values, measurement methods, and applicable reporting requirements. Contact us for accredited grounding measurements."},"footnotes":""},"categories":[11],"tags":[],"class_list":["post-4652","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-makaleler"],"acf":[],"taxonomy_info":{"category":[{"value":11,"label":"Makaleler"}]},"featured_image_src_large":["https:\/\/aesinn.com\/wp-content\/uploads\/aes-thumbnail.png",768,768,false],"author_info":{"display_name":"Emre Metin","author_link":"https:\/\/aesinn.com\/en\/author\/yonetim\/"},"comment_info":"","category_info":[{"term_id":11,"name":"Makaleler","slug":"makaleler","term_group":0,"term_taxonomy_id":11,"taxonomy":"category","description":"","parent":0,"count":29,"filter":"raw","cat_ID":11,"category_count":29,"category_description":"","cat_name":"Makaleler","category_nicename":"makaleler","category_parent":0}],"tag_info":false,"_links":{"self":[{"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/posts\/4652","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/comments?post=4652"}],"version-history":[{"count":2,"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/posts\/4652\/revisions"}],"predecessor-version":[{"id":5106,"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/posts\/4652\/revisions\/5106"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/media\/2568"}],"wp:attachment":[{"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/media?parent=4652"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/categories?post=4652"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aesinn.com\/en\/wp-json\/wp\/v2\/tags?post=4652"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}