{"id":4834,"date":"2026-01-22T13:49:47","date_gmt":"2026-01-22T05:49:47","guid":{"rendered":"https:\/\/feichuncables.com\/blog\/?p=4834"},"modified":"2026-01-22T13:49:49","modified_gmt":"2026-01-22T05:49:49","slug":"what-is-the-significance-of-the-voltage-rating-notation-uo-u-um-e-g-6-10-12-kv-in-vde-0250-specifications","status":"publish","type":"post","link":"https:\/\/feichuncables.com\/blog\/what-is-the-significance-of-the-voltage-rating-notation-uo-u-um-e-g-6-10-12-kv-in-vde-0250-specifications\/","title":{"rendered":"What is the significance of the voltage rating notation Uo\/U (Um) (e.g., 6\/10 (12) kV) in VDE 0250 specifications?"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img data-dominant-color=\"6e8aa2\" data-has-transparency=\"false\" style=\"--dominant-color: #6e8aa2;\" loading=\"lazy\" decoding=\"async\" width=\"968\" height=\"400\" sizes=\"auto, (max-width: 968px) 100vw, 968px\" src=\"https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-556.avif\" alt=\"\" class=\"wp-image-4835 not-transparent\" title=\"\" srcset=\"https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-556.avif 968w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-556-300x124.avif 300w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-556-768x317.avif 768w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-556-400x165.avif 400w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-556-800x331.avif 800w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-556-832x344.avif 832w\" \/><\/figure>\n\n\n\n<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n    <meta charset=\"UTF-8\">\n    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n    <title>Voltage Rating Uo\/U (Um) Significance &#8211; Anhui Feichun Special Cable Co., Ltd<\/title>\n<\/head>\n<body>\n\n<main style=\"width: 100%; max-width: 1200px; margin: 0 auto; padding: 20px; line-height: 1.6; font-family: sans-serif;\">\n\n    <header>\n        <h1>Technical Insight: Significance of Voltage Rating $U_0\/U (U_m)$ in VDE 0250 Specifications<\/h1>\n        <p><strong>\u5b89\u5fbd\u98de\u7eaf\u7279\u79cd\u7535\u7f06\u6709\u9650\u516c\u53f8 (Anhui Feichun Special Cable Co., Ltd)<\/strong> \u2014 Professional Cable Solutions for Mining and Heavy Industry.<\/p>\n    <\/header>\n\n    <hr>\n\n    <section>\n        <h2>1. Overview of the $U_0\/U (U_m)$ Notation \/ \u989d\u5b9a\u7535\u538b $U_0\/U (U_m)$ \u7b26\u53f7\u6982\u8ff0<\/h2>\n        <p>\n            In international and German VDE standards (specifically VDE 0250), the voltage rating of a cable is not a single value but a set of three parameters. For example, a <strong>6\/10 (12) kV<\/strong> rating defines the electrical limits under different operating conditions.\n        <\/p>\n        <p>\n            \u5728\u56fd\u9645\u548c\u5fb7\u56fd VDE \u6807\u51c6\uff08\u7279\u522b\u662f VDE 0250\uff09\u4e2d\uff0c\u7535\u7f06\u7684\u989d\u5b9a\u7535\u538b\u4e0d\u662f\u5355\u4e00\u6570\u503c\uff0c\u800c\u662f\u4e00\u7ec4\u4e09\u4e2a\u53c2\u6570\u3002\u4f8b\u5982\uff0c<strong>6\/10 (12) kV<\/strong> \u989d\u5b9a\u503c\u5b9a\u4e49\u4e86\u4e0d\u540c\u8fd0\u884c\u6761\u4ef6\u4e0b\u7684\u7535\u6c14\u6781\u9650\u3002\n        <\/p>\n    <\/section>\n\n    <section>\n        <table border=\"1\" cellpadding=\"10\" cellspacing=\"0\" style=\"width: 100%; border-collapse: collapse; margin: 20px 0; text-align: left;\">\n            <thead>\n                <tr style=\"background-color: rgba(128, 128, 128, 0.1);\">\n                    <th>Parameter (\u53c2\u6570)<\/th>\n                    <th>Definition (\u5b9a\u4e49)<\/th>\n                    <th>Technical Meaning (\u6280\u672f\u542b\u4e49)<\/th>\n                <\/tr>\n            <\/thead>\n            <tbody>\n                <tr>\n                    <td><strong>$U_0$<\/strong><\/td>\n                    <td>Phase-to-Earth Voltage (\u5bfc\u4f53\u5bf9\u5730\u7535\u538b)<\/td>\n                    <td>The RMS voltage between the main conductor and the earth or metallic screen.<\/td>\n                <\/tr>\n                <tr>\n                    <td><strong>$U$<\/strong><\/td>\n                    <td>Phase-to-Phase Voltage (\u76f8\u95f4\u7535\u538b)<\/td>\n                    <td>The RMS voltage between any two phase conductors in a multi-core cable.<\/td>\n                <\/tr>\n                <tr>\n                    <td><strong>$U_m$<\/strong><\/td>\n                    <td>Maximum System Voltage (\u7cfb\u7edf\u6700\u9ad8\u7535\u538b)<\/td>\n                    <td>The highest permissible continuous operating voltage for which the cable is designed.<\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n    <\/section>\n\n    <section>\n        <h2>2. Detailed Breakdown of 6\/10 (12) kV \/ 6\/10 (12) kV \u8be6\u7ec6\u89e3\u6790<\/h2>\n        <p>\n            When a cable like the <strong>(N)3GHSSHCH<\/strong> or <strong>NSHT\u00d6U<\/strong> (common in VDE 0250-813) is rated as 6\/10 (12) kV, it implies:\n        <\/p>\n        <ul>\n            <li><strong>$U_0 = 6$ kV:<\/strong> Designed for systems where the voltage to ground does not exceed 6 kV. \/ \u8bbe\u8ba1\u7528\u4e8e\u5bf9\u5730\u7535\u538b\u4e0d\u8d85\u8fc7 6 kV \u7684\u7cfb\u7edf\u3002<\/li>\n            <li><strong>$U = 10$ kV:<\/strong> The nominal operating voltage between phases. \/ \u76f8\u95f4\u7684\u989d\u5b9a\u5de5\u4f5c\u7535\u538b\u3002<\/li>\n            <li><strong>$U_m = 12$ kV:<\/strong> The cable can withstand sustained peaks or fluctuations up to 12 kV, which is 20% higher than the nominal $U$. \/ \u7535\u7f06\u53ef\u627f\u53d7\u9ad8\u8fbe 12 kV \u7684\u6301\u7eed\u5cf0\u503c\u6216\u6ce2\u52a8\uff0c\u6bd4\u989d\u5b9a\u7535\u538b $U$ \u9ad8\u51fa 20%\u3002<\/li>\n        <\/ul>\n    <\/section>\n\n    <section>\n        <h2>3. Industrial Significance and Safety \/ \u5de5\u4e1a\u610f\u4e49\u4e0e\u5b89\u5168\u6027<\/h2>\n        <p>\n            Properly identifying these values is crucial for heavy machinery such as cranes, stacker-reclaimers, and mining equipment. Using a cable with an insufficient $U_m$ can lead to dielectric breakdown during transient surges.\n        <\/p>\n        <p>\n            \u6b63\u786e\u8bc6\u522b\u8fd9\u4e9b\u6570\u503c\u5bf9\u4e8e\u8d77\u91cd\u673a\u3001\u5806\u53d6\u6599\u673a\u548c\u77ff\u5c71\u8bbe\u5907\u7b49\u91cd\u578b\u673a\u68b0\u81f3\u5173\u91cd\u8981\u3002\u4f7f\u7528 $U_m$ \u4e0d\u8db3\u7684\u7535\u7f06\u53ef\u80fd\u4f1a\u5728\u77ac\u6001\u6d6a\u6d8c\u671f\u95f4\u5bfc\u81f4\u4ecb\u7535\u51fb\u7a7f\u3002\n        <\/p>\n        <blockquote>\n            <strong>Note:<\/strong> According to <a href=\"https:\/\/www.vde-verlag.de\/standards\/vde-standards.html\" rel=\"nofollow noopener\" target=\"_blank\">VDE Standards<\/a>, $U_m$ is the &#8220;highest system voltage&#8221; and is used to determine test voltages during manufacturing.\n        <\/blockquote>\n    <\/section>\n\n    <section>\n        <h2>4. Comparison of Common Voltage Classes \/ \u5e38\u89c1\u7535\u538b\u7b49\u7ea7\u5bf9\u6bd4<\/h2>\n        <table border=\"1\" cellpadding=\"10\" cellspacing=\"0\" style=\"width: 100%; border-collapse: collapse; margin: 20px 0; text-align: center;\">\n            <thead>\n                <tr style=\"background-color: rgba(128, 128, 128, 0.1);\">\n                    <th>Cable Type (\u7535\u7f06\u578b\u53f7)<\/th>\n                    <th>$U_0\/U$ (kV)<\/th>\n                    <th>$U_m$ (kV)<\/th>\n                    <th>Application (\u5e94\u7528\u573a\u666f)<\/th>\n                <\/tr>\n            <\/thead>\n            <tbody>\n                <tr>\n                    <td>Low Voltage (LV)<\/td>\n                    <td>0.6\/1<\/td>\n                    <td>1.2<\/td>\n                    <td>Conveyor belts, light cranes<\/td>\n                <\/tr>\n                <tr>\n                    <td>Medium Voltage (MV)<\/td>\n                    <td>3.6\/6<\/td>\n                    <td>7.2<\/td>\n                    <td>Standard industrial power<\/td>\n                <\/tr>\n                <tr>\n                    <td>High-Stress MV<\/td>\n                    <td>6\/10<\/td>\n                    <td>12<\/td>\n                    <td>Heavy-duty mining, reeling<\/td>\n                <\/tr>\n                <tr>\n                    <td>Extreme MV<\/td>\n                    <td>12\/20<\/td>\n                    <td>24<\/td>\n                    <td>Deep shaft mining, tunneling<\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n    <\/section>\n\n    <hr>\n\n    <footer>\n        <h3>Contact for Specialized Engineering Support \/ \u4e13\u9879\u5de5\u7a0b\u652f\u6301\u8054\u7cfb\u65b9\u5f0f<\/h3>\n        <p>For technical inquiries regarding VDE 0250 reeling cables or custom mining solutions:<\/p>\n        <p>\n            <strong>WhatsApp:<\/strong> <a href=\"https:\/\/wa.me\/8613855123218\" rel=\"nofollow noopener\" target=\"_blank\">+86 13855123218<\/a><br>\n            <strong>Technical Dept:<\/strong> <a href=\"mailto:tech@feichuncables.com\" rel=\"nofollow\">tech@feichuncables.com<\/a><br>\n            <strong>Sales Support:<\/strong> <a href=\"mailto:zihao.yang@feichuncables.com\" rel=\"nofollow\">zihao.yang@feichuncables.com<\/a> | <a href=\"mailto:ziyu.huang@feichuncables.com\" rel=\"nofollow\">ziyu.huang@feichuncables.com<\/a>\n        <\/p>\n        <p>\n            <em>Evidence-based data sourced from <a href=\"https:\/\/www.iec.ch\/\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60502-2<\/a> and <a href=\"https:\/\/www.elandcables.com\/\" rel=\"nofollow noopener\" target=\"_blank\">Eland Cables Technical Library<\/a>.<\/em>\n        <\/p>\n    <\/footer>\n\n<\/main>\n\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"In international and German VDE standards (specifically VDE 0250), the voltage rating of a cable is not a single value but a set of three parameters. For example, a 6\/10 (12) kV rating defines the electrical limits under different operating conditions.\n\u5728\u56fd\u9645\u548c\u5fb7\u56fd VDE \u6807\u51c6\uff08\u7279\u522b\u662f VDE 0250\uff09\u4e2d\uff0c\u7535\u7f06\u7684\u989d\u5b9a\u7535\u538b\u4e0d\u662f\u5355\u4e00\u6570\u503c\uff0c\u800c\u662f\u4e00\u7ec4\u4e09\u4e2a\u53c2\u6570\u3002\u4f8b\u5982\uff0c6\/10 (12) kV \u989d\u5b9a\u503c\u5b9a\u4e49\u4e86\u4e0d\u540c\u8fd0\u884c\u6761\u4ef6\u4e0b\u7684\u7535\u6c14\u6781\u9650\u3002","protected":false},"author":1,"featured_media":4835,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_singular_sidebar":"left","csco_page_header_type":"title","csco_page_load_nextpost":"","footnotes":""},"categories":[66,94,56],"tags":[25784,32120,32117,2484,2368,32119,171,28087,6220,152,107,176,32123,32121,828,139,214,204,9287,32122,11874,32118,140],"class_list":["post-4834","post","type-post","status-publish","format-standard","has-post-thumbnail","category-common-problems-encountered-in-cable-applications","category-din-vde-0250-mining-cable","category-reeling-cable","tag-n3ghsshch-cable-2","tag-12kv-maximum-system-voltage","tag-6-10kv-cable-specification","tag-anhui-feichun-special-cable","tag-crane-power-cable","tag-drum-reeling-cable-voltage","tag-explosion-proof-mining-cable","tag-flexible-high-voltage-cable","tag-german-standard-cable","tag-heavy-duty-mining-cable","tag-heavy-duty-e-loader-mining-cable","tag-icea-s-75-381-2","tag-iec-60502-2-equivalent","tag-industrial-cable-electrical-parameters","tag-medium-voltage-mining-cable","tag-mining-cables","tag-mining-power-cable","tag-mining-trailing-cable","tag-nshtou-reeling-cable","tag-tbm-tunneling-cable","tag-trailing-cable-for-mining","tag-uo-u-um-voltage-rating","tag-vde-0250-813","cs-entry"],"_links":{"self":[{"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/posts\/4834","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/comments?post=4834"}],"version-history":[{"count":1,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/posts\/4834\/revisions"}],"predecessor-version":[{"id":4836,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/posts\/4834\/revisions\/4836"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/media\/4835"}],"wp:attachment":[{"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/media?parent=4834"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/categories?post=4834"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/tags?post=4834"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}