{"id":51355,"date":"2015-09-25T13:22:38","date_gmt":"2015-09-25T10:22:38","guid":{"rendered":"https:\/\/yilkomer.com\/dokunma-gerilimi-hesabi\/"},"modified":"2026-08-24T06:12:34","modified_gmt":"2026-08-24T03:12:34","slug":"touch-voltage-calculation","status":"publish","type":"post","link":"https:\/\/yilkomer.com\/en\/touch-voltage-calculation\/","title":{"rendered":"Touch Voltage Calculation"},"content":{"rendered":"<div class=\"vgblk-rw-wrapper limit-wrapper\">\n<h2><span style=\"color: #ff6600;\">What is Touch Voltage?<\/span><\/h2>\n<p>Touch voltage is the portion of the grounding voltage that can be bridged by a human. In this case, the current path through the human body is from hand to foot (horizontal distance to touchable point approximately 1 m) or from hand to hand.<\/p>\n<figure id=\"attachment_4439\" aria-describedby=\"caption-attachment-4439\" style=\"width: 666px\" class=\"wp-caption alignnone\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-4439 size-full\" src=\"https:\/\/yilkomer.com\/wp-content\/uploads\/2015\/09\/dokunma-gerilimi-nedir.png\" alt=\"Touch voltage diagram\" width=\"666\" height=\"238\" srcset=\"https:\/\/yilkomer.com\/wp-content\/uploads\/2015\/09\/dokunma-gerilimi-nedir.png 666w, https:\/\/yilkomer.com\/wp-content\/uploads\/2015\/09\/dokunma-gerilimi-nedir-300x107.png 300w\" sizes=\"(max-width: 666px) 100vw, 666px\" \/><figcaption id=\"caption-attachment-4439\" class=\"wp-caption-text\"><br \/>Touch voltage<\/figcaption><\/figure>\n<ul>\n<li>E: Grounding electrode<\/li>\n<li>S1, S2, S3: Potential equalizing electrodes connected to the main grounding electrode<\/li>\n<li>UE: Grounding voltage<\/li>\n<li>USS: Possible step voltage<\/li>\n<li>UST: Maximum possible touch voltage<\/li>\n<li>UTST: Maximum transferred touch voltage, if the sheath is not grounded at the farthest point<\/li>\n<li>UTSTE: Maximum transferred touch voltage, if the sheath is grounded at the farthest point<\/li>\n<\/ul>\n<blockquote>\n<p style=\"text-align: center;\">You may be interested in: <strong><a href=\"https:\/\/yilkomer.com\/en\/step-voltage-calculation\/\" target=\"_blank\" rel=\"noopener\">Step Voltage Calculation<\/a><\/strong><\/p>\n<\/blockquote>\n<p>For low voltage, the permissible touch voltage UL should not exceed 50 V. In construction sites, agricultural areas, and similar locations, this value is set to 25 V. Since human body resistance and the position and condition of touch points vary from person to person, current-based calculations are not practical. Therefore, hazard limits are defined according to touch voltage and duration. Further information on touch voltage and body current is available in <span style=\"color: #ff6600;\"><strong><a style=\"color: #ff6600;\" href=\"https:\/\/yilkomer.com\/en\/regulation-on-grounding-in-electrical-installations\/\" target=\"_blank\" rel=\"noopener\">Grounding Regulations in Electrical Installations<\/a><\/strong><\/span>, Appendix C.<\/p>\n<h2><span style=\"color: #ff6600;\">Example Touch Voltage Calculation<\/span><\/h2>\n<figure id=\"attachment_4440\" aria-describedby=\"caption-attachment-4440\" style=\"width: 537px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-4440\" src=\"https:\/\/yilkomer.com\/wp-content\/uploads\/2015\/09\/%C3%B6rnek-dokunma-mesafesi-hesab%C4%B1.png\" alt=\"Example touch voltage calculation\" width=\"537\" height=\"381\" \/><figcaption id=\"caption-attachment-4440\" class=\"wp-caption-text\"><br \/>Example touch voltage calculation<\/figcaption><\/figure>\n<p>Transformer reactance Xtr = (6\/100) \u00d7 0.4 \u00d7 0.4 \/ 1 = 0.0096 \u03a9<\/p>\n<p>Rh = (56\/50) \u00d7 100 = 0.04 \u03a9, Xh = 8.478 \u03a9<\/p>\n<p>Resistance and reactance of the network up to the grounded consumer:<\/p>\n<p>Total resistance in the fault current path:<\/p>\n<p>Ztotal = RA + 2.04 \u03a9<\/p>\n<p>If RA is selected so that the touch voltage does not exceed the safety limit of 50 V under fault, then 230 &#8211; 50 = 180 V. Current: 180 \/ 2.04 = 88.23 A. Therefore, RA = 50 \/ 88.23 = 0.566 \u03a9.<\/p><\/div>\n<p><!-- .vgblk-rw-wrapper --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>What is Touch Voltage? Touch voltage is the portion of the grounding voltage that can be bridged by a human. In this case, the current path through the human body is from hand to foot (horizontal distance to touchable point approximately 1 m) or from hand to hand. E: Grounding electrode S1, S2, S3: Potential&#8230;<\/p>\n","protected":false},"author":1,"featured_media":992406,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-51355","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general"],"_links":{"self":[{"href":"https:\/\/yilkomer.com\/en\/wp-json\/wp\/v2\/posts\/51355","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yilkomer.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yilkomer.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yilkomer.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yilkomer.com\/en\/wp-json\/wp\/v2\/comments?post=51355"}],"version-history":[{"count":1,"href":"https:\/\/yilkomer.com\/en\/wp-json\/wp\/v2\/posts\/51355\/revisions"}],"predecessor-version":[{"id":994211,"href":"https:\/\/yilkomer.com\/en\/wp-json\/wp\/v2\/posts\/51355\/revisions\/994211"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yilkomer.com\/en\/wp-json\/wp\/v2\/media\/992406"}],"wp:attachment":[{"href":"https:\/\/yilkomer.com\/en\/wp-json\/wp\/v2\/media?parent=51355"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yilkomer.com\/en\/wp-json\/wp\/v2\/categories?post=51355"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yilkomer.com\/en\/wp-json\/wp\/v2\/tags?post=51355"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}