{"id":2606,"date":"2022-07-20T10:34:13","date_gmt":"2022-07-20T10:34:13","guid":{"rendered":"http:\/\/www.topcable.com\/blog-electric-cable\/?p=2606"},"modified":"2025-05-09T08:45:12","modified_gmt":"2025-05-09T08:45:12","slug":"when-is-it-necessary-to-perform-the-alternate-flexion-test","status":"publish","type":"post","link":"https:\/\/www.topcable.com\/blog-electric-cable\/when-is-it-necessary-to-perform-the-alternate-flexion-test\/","title":{"rendered":"When is it necessary to perform the alternate flexion test?"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 ez-toc-wrap-left-text counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<label for=\"ez-toc-cssicon-toggle-item-6a42eb8b62722\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"ez-toc-title\" style=\"cursor:inherit\">INDEX<\/span>\n<span class=\"ez-toc-cssicon\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #444444;color:#444444\" 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: #444444;color:#444444\" 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><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6a42eb8b62722\" checked \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.topcable.com\/blog-electric-cable\/when-is-it-necessary-to-perform-the-alternate-flexion-test\/#-the-alternate-flexion-test\" >&nbsp;THE ALTERNATE FLEXION TEST<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.topcable.com\/blog-electric-cable\/when-is-it-necessary-to-perform-the-alternate-flexion-test\/#30000-complete-cycles-without-failure\" >30.000 COMPLETE CYCLES WITHOUT FAILURE<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.topcable.com\/blog-electric-cable\/when-is-it-necessary-to-perform-the-alternate-flexion-test\/#top-cable-range-that-successfully-passes-the-flexion-test\" >TOP CABLE RANGE THAT SUCCESSFULLY PASSES THE FLEXION TEST<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"-the-alternate-flexion-test\"><\/span>&nbsp;THE ALTERNATE FLEXION TEST<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>This test is performed on cables subjected to frequent flexions, such as service lift cables. <\/strong>The goal of this flexion test is to demonstrate that both the construction of the cable and the materials utilized in its manufacture is the most suitable to guarantee its durability.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-cover\"><img decoding=\"async\" class=\"wp-block-cover__image-background wp-image-12852 lazyload\" alt=\"\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/elevator-746x419-1.jpg\" style=\"object-position:46% 68%\" data-object-fit=\"cover\" data-object-position=\"46% 68%\"\/><noscript><img decoding=\"async\" class=\"wp-block-cover__image-background wp-image-12852 lazyload\" alt=\"\" src=\"https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/elevator-746x419-1.jpg\" style=\"object-position:46% 68%\" data-object-fit=\"cover\" data-object-position=\"46% 68%\"\/><\/noscript><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim\"><\/span><div class=\"wp-block-cover__inner-container is-layout-flow wp-block-cover-is-layout-flow\">\n<p class=\"has-text-align-center has-large-font-size wp-block-paragraph\"><\/p>\n<\/div><\/div>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">In certain applications, cables are subjected to frequent flexion while they are in service. Examples of these installations are bridge cranes, lifts and service lifts, robots, and home appliance cables. In these cases, cables that are suitable for mobile service must be used. <strong>The difference between fixed and mobile service cable is the alternate flexion test.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Manufacturers demonstrate that both the construction and well as materials are suitable for this demanding application. Only if the cable resists this test satisfactorily can a suitable duration be guaranteed once in service.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"30000-complete-cycles-without-failure\"><\/span>30.000 COMPLETE CYCLES WITHOUT FAILURE<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The test consists in subjecting a sample of cable to 30,000 complete cycles of alternate flexion.<\/strong> During the test, an electrical current circulates through the conductors of the cable and tension is applied between conductors.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-cover\"><img decoding=\"async\" class=\"wp-block-cover__image-background wp-image-2610 lazyload\" alt=\"When-is-it-necessary-to-perform-the-alternate-flexions-test-3\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/When-is-it-necessary-to-perform-the-alternate-flexions-test-3.jpg\" style=\"object-position:54% 100%\" data-object-fit=\"cover\" data-object-position=\"54% 100%\"\/><noscript><img decoding=\"async\" width=\"800\" height=\"600\" class=\"wp-block-cover__image-background wp-image-2610 lazyload\" alt=\"When-is-it-necessary-to-perform-the-alternate-flexions-test-3\" src=\"https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/When-is-it-necessary-to-perform-the-alternate-flexions-test-3.jpg\" style=\"object-position:54% 100%\" data-object-fit=\"cover\" data-object-position=\"54% 100%\" srcset=\"https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/When-is-it-necessary-to-perform-the-alternate-flexions-test-3.jpg 800w, https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/When-is-it-necessary-to-perform-the-alternate-flexions-test-3-768x576.jpg 768w, https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/When-is-it-necessary-to-perform-the-alternate-flexions-test-3-300x225.jpg 300w, https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/When-is-it-necessary-to-perform-the-alternate-flexions-test-3-624x468.jpg 624w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim\"><\/span><div class=\"wp-block-cover__inner-container is-layout-flow wp-block-cover-is-layout-flow\">\n<p class=\"has-text-align-center has-large-font-size wp-block-paragraph\"><\/p>\n<\/div><\/div>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">During the test, <strong>the cable is subjected to mechanical, thermal and electrical efforts.<\/strong> For this, a <a href=\"https:\/\/en.wikipedia.org\/wiki\/Testbed\" target=\"_blank\" rel=\"noreferrer noopener\">test bed<\/a> is utilized as in the figure. On this bed, the central carriage is mobile and moves in a back-and-forth movement of 1 meter of width at a speed of 0.33 m\/s. This means that it makes a complete cycle every 6 seconds<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>cable is placed in an S<\/strong> between the pulleys of the carriage in such a way <strong>that the first pulley flexes in one direction and<\/strong> on passing the second, <strong>flexion is produced in the opposite direction.<\/strong> In each cycle, the cable passes twice through each pulley. The ends of the cable are connected to the corresponding terminals and weights. Then hung to maintain the correct mechanical tension.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-cover\"><img decoding=\"async\" class=\"wp-block-cover__image-background wp-image-2609 lazyload\" alt=\"When-is-it-necessary-to-perform-the-alternate-flexions-test-2\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/When-is-it-necessary-to-perform-the-alternate-flexions-test-2.jpg\" style=\"object-position:58% 18%\" data-object-fit=\"cover\" data-object-position=\"58% 18%\"\/><noscript><img decoding=\"async\" width=\"800\" height=\"368\" class=\"wp-block-cover__image-background wp-image-2609 lazyload\" alt=\"When-is-it-necessary-to-perform-the-alternate-flexions-test-2\" src=\"https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/When-is-it-necessary-to-perform-the-alternate-flexions-test-2.jpg\" style=\"object-position:58% 18%\" data-object-fit=\"cover\" data-object-position=\"58% 18%\" srcset=\"https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/When-is-it-necessary-to-perform-the-alternate-flexions-test-2.jpg 800w, https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/When-is-it-necessary-to-perform-the-alternate-flexions-test-2-768x353.jpg 768w, https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/When-is-it-necessary-to-perform-the-alternate-flexions-test-2-300x138.jpg 300w, https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/When-is-it-necessary-to-perform-the-alternate-flexions-test-2-624x287.jpg 624w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim\"><\/span><div class=\"wp-block-cover__inner-container is-layout-flow wp-block-cover-is-layout-flow\">\n<p class=\"has-text-align-center has-large-font-size wp-block-paragraph\"><\/p>\n<\/div><\/div>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The diameter of the pulleys, the weights, the intensity, and the voltage applied depend on the section and the number of conductors. The flexion test parameters are defined in norms UNE21027 and UNE 21031. For example, a type H07RN-F 3&#215;1.5 cable is tested with 120 mm \u00d8 pulleys, 1.5 kg weights and 16 Amperes per conductor. The voltage applied of 400 V between conductors and 230 V to the ground.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The test is equipped with <strong>a control console that detects any short-circuit between conductors.<\/strong> Leaks to the ground or lack of continuity of the conductor from breakage of the copper. In any of these cases, the test stops automatically.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"top-cable-range-that-successfully-passes-the-flexion-test\"><\/span>TOP CABLE RANGE THAT SUCCESSFULLY PASSES THE FLEXION TEST<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">All cables suitable for mobile service must exceed 30,000 cycles of alternate flexion without failure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To know the type of service foreseen for a certain cable. One only has to look at the mark that appears on the&nbsp;cable cover. All those cables are suitable for mobile service such as, for example: the <strong><a href=\"https:\/\/www.topcable.com\/cable\/topflex-vv-f-h05vv-f\/\" target=\"_blank\" rel=\"noreferrer noopener\">Topflex VV-F H05VV-F<\/a> <\/strong>cable, the <strong><a href=\"https:\/\/www.topcable.com\/cable\/flextel-110-es05vv-f\/\" target=\"_blank\" rel=\"noreferrer noopener\">Flextel 110 ES05VV-F<\/a><\/strong> cable and the <strong><a href=\"https:\/\/www.topcable.com\/cable\/xtrem-h07rn-f\/\" target=\"_blank\" rel=\"noreferrer noopener\">Xtrem H07RN-F<\/a><\/strong> cable.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-cover\"><img decoding=\"async\" class=\"wp-block-cover__image-background wp-image-2608 lazyload\" alt=\"When-is-it-necessary-to-perform-the-alternate-flexions-test--1\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/When-is-it-necessary-to-perform-the-alternate-flexions-test-1.jpg\" data-object-fit=\"cover\"\/><noscript><img decoding=\"async\" width=\"800\" height=\"460\" class=\"wp-block-cover__image-background wp-image-2608 lazyload\" alt=\"When-is-it-necessary-to-perform-the-alternate-flexions-test--1\" src=\"https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/When-is-it-necessary-to-perform-the-alternate-flexions-test-1.jpg\" data-object-fit=\"cover\" srcset=\"https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/When-is-it-necessary-to-perform-the-alternate-flexions-test-1.jpg 800w, https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/When-is-it-necessary-to-perform-the-alternate-flexions-test-1-300x173.jpg 300w, https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/When-is-it-necessary-to-perform-the-alternate-flexions-test-1-768x442.jpg 768w, https:\/\/www.topcable.com\/blog-electric-cable\/wp-content\/uploads\/2016\/07\/When-is-it-necessary-to-perform-the-alternate-flexions-test-1-624x359.jpg 624w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim\"><\/span><div class=\"wp-block-cover__inner-container is-layout-flow wp-block-cover-is-layout-flow\">\n<p class=\"has-text-align-center has-large-font-size wp-block-paragraph\"><\/p>\n<\/div><\/div>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong><a href=\"https:\/\/www.topcable.com\/cable\/topflat-h05vvh6-f-and-h07vvh6-f\/\">Topflat H07VVH6-F<\/a><\/strong> cable, recommended for use in lifts and service lifts, successfully passes the alternate flexion test.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp;THE ALTERNATE FLEXION TEST This test is performed on cables subjected to frequent flexions, such as service lift cables. The goal of this flexion test is to demonstrate that both the construction of the cable and the materials utilized in its manufacture is the most suitable to guarantee its durability. In certain applications, cables are [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":12895,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[588],"tags":[774,776,775,777,779,778],"class_list":["post-2606","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-top-cable-en","tag-alternate-flexion-test","tag-cables-test","tag-flexion-test","tag-mobile-service","tag-topflat","tag-topflex"],"_links":{"self":[{"href":"https:\/\/www.topcable.com\/blog-electric-cable\/wp-json\/wp\/v2\/posts\/2606","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.topcable.com\/blog-electric-cable\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.topcable.com\/blog-electric-cable\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.topcable.com\/blog-electric-cable\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.topcable.com\/blog-electric-cable\/wp-json\/wp\/v2\/comments?post=2606"}],"version-history":[{"count":10,"href":"https:\/\/www.topcable.com\/blog-electric-cable\/wp-json\/wp\/v2\/posts\/2606\/revisions"}],"predecessor-version":[{"id":30944,"href":"https:\/\/www.topcable.com\/blog-electric-cable\/wp-json\/wp\/v2\/posts\/2606\/revisions\/30944"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.topcable.com\/blog-electric-cable\/wp-json\/wp\/v2\/media\/12895"}],"wp:attachment":[{"href":"https:\/\/www.topcable.com\/blog-electric-cable\/wp-json\/wp\/v2\/media?parent=2606"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.topcable.com\/blog-electric-cable\/wp-json\/wp\/v2\/categories?post=2606"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.topcable.com\/blog-electric-cable\/wp-json\/wp\/v2\/tags?post=2606"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}