{"id":5251,"date":"2026-10-06T14:25:26","date_gmt":"2026-10-06T06:25:26","guid":{"rendered":"https:\/\/tebaoflex-cable.com\/cases\/bucket-wheel-excavator-reeling-cable-12-20kv-poland\/"},"modified":"2026-10-10T09:16:50","modified_gmt":"2026-10-10T01:16:50","slug":"bucket-wheel-excavator-reeling-cable-12-20kv-poland","status":"publish","type":"page","link":"https:\/\/tebaoflex-cable.com\/tr\/cases\/bucket-wheel-excavator-reeling-cable-12-20kv-poland\/","title":{"rendered":"Polonya&#039;daki Bir Maden i\u00e7in Kep\u00e7e Tekerlekli Ekskavat\u00f6r Tambur Kablosu"},"content":{"rendered":"\n<style>\n.tbf-case-pg{max-width:960px;margin-left:auto;margin-right:auto;--ink:#16202b;--muted:#5b6b7c;--line:#e2e8ee;--accent:#b4381f;--soft:#f6f8fa;color:var(--ink);line-height:1.7;font-size:17px}\n.tbf-case-pg h1{font-size:2rem;line-height:1.2;margin:0 0 .6rem}\n.tbf-case-pg h2{font-size:1.5rem;margin:2.4rem 0 .5rem;border-top:3px solid var(--ink);padding-top:.5rem}\n.tbf-case-pg h3{font-size:1.08rem;margin:1.4rem 0 .3rem}\n.tbf-case-pg p{margin:0 0 1rem}\n.tbf-case-pg a{color:var(--accent);text-underline-offset:2px}\n.tbf-kicker{font-size:.75rem;letter-spacing:.1em;text-transform:uppercase;font-weight:700;color:#1f7a5c;margin-bottom:.4rem}\n.tbf-lede{font-size:1.1rem;color:var(--muted)}\n.tbf-case-pg table{width:100%;border-collapse:collapse;margin:1.1rem 0;font-size:.96rem}\n.tbf-case-pg th,.tbf-case-pg td{border:1px solid var(--line);padding:.55rem .75rem;text-align:left;vertical-align:top}\n.tbf-case-pg th{background:var(--soft);width:34%;font-weight:700}\n.tbf-wide{min-width:620px}\n.tbf-wide th{width:auto}\n.tbf-tw{overflow-x:auto}\n.tbf-hero{margin:1.3rem 0 .3rem}\n.tbf-hero img{width:100%;height:auto;display:block;border-radius:10px;border:1px solid var(--line);background:#fff}\n.tbf-hero figcaption,.tbf-fig figcaption{font-size:.85rem;color:var(--muted);margin-top:.4rem}\n.tbf-fig{margin:1.4rem 0}\n.tbf-fig img{width:100%;max-width:520px;height:auto;display:block;margin:0 auto;border-radius:10px;border:1px solid var(--line);background:#fff}\n.tbf-shots{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin:1.4rem 0}\n.tbf-shots figure{margin:0}\n.tbf-shots img{width:100%;height:360px;object-fit:contain;background:#fff;border-radius:10px;border:1px solid var(--line);display:block}\n.tbf-shots figcaption{font-size:.85rem;color:var(--muted);margin-top:.4rem}\n.tbf-scope{border:1px dashed var(--line);border-radius:8px;padding:.85rem 1.1rem;margin:1.2rem 0;font-size:.92rem;color:var(--muted);background:var(--soft)}\n.tbf-eng{background:var(--soft);border-left:3px solid var(--ink);padding:.2rem 1.1rem .6rem;margin:1.2rem 0;border-radius:0 8px 8px 0}\n.tbf-eng .tag{display:inline-block;font-size:.7rem;letter-spacing:.09em;text-transform:uppercase;font-weight:700;color:var(--muted);margin:.9rem 0 .2rem}\n.tbf-need{background:#fdf6f4;border-left:3px solid var(--accent);padding:.9rem 1.1rem;margin:1.2rem 0;border-radius:0 8px 8px 0}\n.tbf-need ul{margin:.4rem 0 0;padding-left:1.1rem;columns:2;column-gap:2rem}\n.tbf-need li{margin:.2rem 0;break-inside:avoid}\n.tbf-rel ul{padding-left:1.1rem;columns:2;column-gap:2rem}\n.tbf-rel li{margin:.22rem 0;break-inside:avoid}\n.tbf-faq details{border-bottom:1px solid var(--line);padding:.8rem 0}\n.tbf-faq summary{cursor:pointer;font-weight:600}\n.tbf-faq p{margin:.55rem 0 0;color:var(--muted)}\n.tbf-cta{display:inline-block;background:var(--accent);color:#fff!important;text-decoration:none!important;border-radius:8px;padding:.6rem 1.15rem;font-weight:600;margin-top:.5rem}\n.tbf-byline{font-size:.92rem;color:var(--muted);background:var(--soft);border-radius:8px;padding:.85rem 1.1rem;margin:1.6rem 0}\n.tbf-back{font-size:.9rem;margin-top:2rem;padding-top:1rem;border-top:1px solid var(--line)}\n@media(max-width:640px){.tbf-shots{grid-template-columns:1fr}.tbf-need ul,.tbf-rel ul{columns:1}.tbf-case-pg th{width:auto}}\n.tbf-case-pg ul.tbf-list,.tbf-case-pg ol.tbf-list{padding-left:1.2rem;margin:0 0 1rem}.tbf-case-pg .tbf-list li{margin:.3rem 0}.tbf-case-pg .tbf-answer{font-size:1.04rem;border-left:3px solid #1f7a5c;padding:.1rem 0 .1rem .9rem}.tbf-case-pg .tbf-note{font-size:.88rem;color:var(--muted)}.tbf-xwrap{display:grid;grid-template-columns:1.1fr 1fr;gap:1.2rem;align-items:center;margin:1.2rem 0}.tbf-xsec,.tbf-bwe{width:100%;height:auto;display:block}.tbf-xwrap ol{margin:0;padding-left:1.4rem;font-size:.95rem}.tbf-xwrap li{margin:.25rem 0}.tbf-diag{margin:1.4rem 0}.tbf-diag ol{padding-left:1.4rem;font-size:.95rem;columns:2;column-gap:2rem}.tbf-diag li{margin:.2rem 0;break-inside:avoid}.tbf-diag figcaption{font-size:.85rem;color:var(--muted);margin-top:.4rem}.tbf-vid{margin:1.4rem auto;max-width:760px}.tbf-vid video{width:100%;height:auto;display:block;border-radius:8px;background:#000}.tbf-vid figcaption{font-size:.85rem;color:var(--muted);margin-top:.4rem}@media(max-width:640px){.tbf-xwrap{grid-template-columns:1fr}.tbf-shots{grid-template-columns:1fr}.tbf-shots img{height:auto}.tbf-diag ol{columns:1}}\n<\/style>\n<div class=\"tbf-case-pg\">\n<p class=\"tbf-kicker\">Project record \u00b7 Poland \u00b7 Open-pit mine \u00b7 Bucket-wheel excavator<\/p>\n<h1>Bucket-Wheel Excavator Reeling Cable for a Polish Mine: 12\/20 kV (N)TSCGECEW\u00d6U with a Witnessed Factory Test<\/h1>\n<p class=\"tbf-lede\">A Polish mining company needed bucket wheel excavator reeling cable: a 12\/20 kV supply that is wound on the excavator&#039;s motorised cable reel and connects the machine to the mine transformer. TEBAOFLEX made two drums, 500 m and 480 m, of (N)TSCGECEW\u00d6U 12\/20 kV 3\u00d735+3\u00d725\/3 with tinned copper conductors, EPR insulation, an individual tinned copper wire screen on each core and a red rubber outer sheath. On 27 September 2026 the buyer&#039;s QC inspector witnessed the factory acceptance test at our factory: 29 kV AC for 5 minutes without breakdown, partial discharge of 2.0 pC against a 10 pC limit, and a conductor resistance of 0.529 \u03a9\/km. Both drums then shipped.<\/p>\n<figure class=\"tbf-hero\"><img fetchpriority=\"high\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/ntscgecewoeu-12-20kv-3x35-3x25-3-reeling-cable-cross-section-red.webp\" alt=\"(N)TSCGECEW\u00d6U 12\/20 kV 3\u00d735+3\u00d725\/3 reeling cable cut end: three screened EPR cores in a red rubber sheath\" width=\"1600\" height=\"900\" fetchpriority=\"high\" decoding=\"async\"><figcaption>Cut end of the (N)TSCGECEW\u00d6U 12\/20 kV 3\u00d735+3\u00d725\/3 cable from this order: three screened EPR cores in a red rubber sheath.<\/figcaption><\/figure>\n<h2>Project at a glance<\/h2>\n<div class=\"tbf-tw\"><table><tbody>\n<tr><th>Location<\/th><td>Poland, open-pit mine<\/td><\/tr>\n<tr><th>End user<\/th><td>A Polish mining company (name not published). The same buyer ordered the low-voltage reeling cable described in <a href=\"https:\/\/tebaoflex-cable.com\/cases\/stacker-reclaimer-reeling-cable-nshtoeu-j-poland\/\">the stacker-reclaimer reeling cable case<\/a>.<\/td><\/tr>\n<tr><th>Machine<\/th><td>Bucket-wheel excavator with a motorised cable reel<\/td><\/tr>\n<tr><th>Cable duty<\/th><td>12\/20 kV power supply wound on the excavator&#039;s cable reel and connected to the mine transformer<\/td><\/tr>\n<tr><th>Cable<\/th><td>(N)TSCGECEW\u00d6U 12\/20 kV 3\u00d735+3\u00d725\/3 (written (N)TSCGECEWOEU in the factory acceptance test report), red outer sheath; construction with reference to DIN VDE 0250-813, the standard the buyer specified<\/td><\/tr>\n<tr><th>Quantity<\/th><td>Two drums: 500 m and 480 m<\/td><\/tr>\n<tr><th>Overall diameter<\/th><td>60.57 mm measured (nominal 60 mm, maximum 63 mm in the test report)<\/td><\/tr>\n<tr><th>Factory acceptance test<\/th><td>27 September 2026 at the TEBAOFLEX factory, witnessed by the buyer&#039;s QC inspector<\/td><\/tr>\n<tr><th>Key results<\/th><td>29 kV AC for 5 minutes without breakdown; partial discharge 2.0 pC (limit 10 pC); conductor resistance 0.529 \u03a9\/km (limit 0.565 \u03a9\/km)<\/td><\/tr>\n<tr><th>Documents<\/th><td>Factory acceptance test report with measured values; the buyer also asked for a Declaration of Conformity with the delivery documents<\/td><\/tr>\n<tr><th>Status<\/th><td>Both drums shipped<\/td><\/tr>\n<\/tbody><\/table><\/div>\n<div class=\"tbf-scope\"><strong>Scope note.<\/strong> The customer, the mine, the excavator and the order value are not published. Cable reel design, terminations and installation on the machine are the responsibility of the machine owner and its installer.<\/div>\n<h2>What reeling cable does a bucket-wheel excavator need?<\/h2>\n<p class=\"tbf-answer\">A bucket-wheel excavator reeling cable is a flexible, screened medium-voltage rubber cable that is wound on and off the excavator&#039;s motorised cable reel. The machine travels along the mine bench on crawlers, so the cable that feeds it from the mine transformer is paid out and reeled in whenever the machine travels, under tension, bending and torsion, in mud, frost and sun. For this Polish mine the buyer specified (N)TSCGECEW\u00d6U 12\/20 kV 3\u00d735+3\u00d725\/3, a construction with reference to DIN VDE 0250-813.<\/p>\n<figure class=\"tbf-diag\"><svg class=\"tbf-bwe\" viewBox=\"0 0 760 340\" role=\"img\" aria-labelledby=\"bwe-t\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><title id=\"bwe-t\">Schematic of a bucket-wheel excavator fed through a medium-voltage reeling cable from a mine transformer<\/title><line x1=\"20\" y1=\"300\" x2=\"740\" y2=\"300\" stroke=\"#8b7d6b\" stroke-width=\"3\"\/><rect x=\"250\" y=\"266\" width=\"170\" height=\"34\" rx=\"15\" fill=\"#4b4b4b\"\/><circle cx=\"268\" cy=\"283\" r=\"9\" fill=\"#8a8a8a\"\/><circle cx=\"294\" cy=\"283\" r=\"9\" fill=\"#8a8a8a\"\/><circle cx=\"320\" cy=\"283\" r=\"9\" fill=\"#8a8a8a\"\/><circle cx=\"346\" cy=\"283\" r=\"9\" fill=\"#8a8a8a\"\/><circle cx=\"372\" cy=\"283\" r=\"9\" fill=\"#8a8a8a\"\/><circle cx=\"398\" cy=\"283\" r=\"9\" fill=\"#8a8a8a\"\/><line x1=\"292\" y1=\"216\" x2=\"122\" y2=\"150\" stroke=\"#e0a800\" stroke-width=\"11\" stroke-linecap=\"round\"\/><line x1=\"388\" y1=\"216\" x2=\"522\" y2=\"172\" stroke=\"#e0a800\" stroke-width=\"9\" stroke-linecap=\"round\"\/><rect x=\"506\" y=\"156\" width=\"44\" height=\"32\" fill=\"#7a7a7a\"\/><polyline points=\"322,200 345,104 368,200\" fill=\"none\" stroke=\"#b58800\" stroke-width=\"5\"\/><line x1=\"345\" y1=\"104\" x2=\"130\" y2=\"148\" stroke=\"#555\" stroke-width=\"1.6\"\/><line x1=\"345\" y1=\"104\" x2=\"520\" y2=\"168\" stroke=\"#555\" stroke-width=\"1.6\"\/><rect x=\"280\" y=\"198\" width=\"120\" height=\"68\" rx=\"4\" fill=\"#f2b705\" stroke=\"#8a6d00\" stroke-width=\"2\"\/><rect x=\"296\" y=\"210\" width=\"34\" height=\"22\" fill=\"#cfe3f3\" stroke=\"#8a6d00\"\/><circle cx=\"110\" cy=\"150\" r=\"44\" fill=\"none\" stroke=\"#8a6d00\" stroke-width=\"7\"\/><circle cx=\"110\" cy=\"150\" r=\"10\" fill=\"#8a6d00\"\/><circle cx=\"158.0\" cy=\"150.0\" r=\"7\" fill=\"#e0a800\" stroke=\"#8a6d00\" stroke-width=\"1.5\"\/><circle cx=\"148.8\" cy=\"178.2\" r=\"7\" fill=\"#e0a800\" stroke=\"#8a6d00\" stroke-width=\"1.5\"\/><circle cx=\"124.8\" cy=\"195.7\" r=\"7\" fill=\"#e0a800\" stroke=\"#8a6d00\" stroke-width=\"1.5\"\/><circle cx=\"95.2\" cy=\"195.7\" r=\"7\" fill=\"#e0a800\" stroke=\"#8a6d00\" stroke-width=\"1.5\"\/><circle cx=\"71.2\" cy=\"178.2\" r=\"7\" fill=\"#e0a800\" stroke=\"#8a6d00\" stroke-width=\"1.5\"\/><circle cx=\"62.0\" cy=\"150.0\" r=\"7\" fill=\"#e0a800\" stroke=\"#8a6d00\" stroke-width=\"1.5\"\/><circle cx=\"71.2\" cy=\"121.8\" r=\"7\" fill=\"#e0a800\" stroke=\"#8a6d00\" stroke-width=\"1.5\"\/><circle cx=\"95.2\" cy=\"104.3\" r=\"7\" fill=\"#e0a800\" stroke=\"#8a6d00\" stroke-width=\"1.5\"\/><circle cx=\"124.8\" cy=\"104.3\" r=\"7\" fill=\"#e0a800\" stroke=\"#8a6d00\" stroke-width=\"1.5\"\/><circle cx=\"148.8\" cy=\"121.8\" r=\"7\" fill=\"#e0a800\" stroke=\"#8a6d00\" stroke-width=\"1.5\"\/><line x1=\"400\" y1=\"244\" x2=\"430\" y2=\"244\" stroke=\"#555\" stroke-width=\"5\"\/><circle cx=\"456\" cy=\"244\" r=\"27\" fill=\"#d0d0d0\" stroke=\"#555\" stroke-width=\"2.5\"\/><circle cx=\"456\" cy=\"244\" r=\"18\" fill=\"none\" stroke=\"#c62f3a\" stroke-width=\"7\"\/><path d=\"M456 271 C 460 286, 470 296, 486 299 L 690 299\" fill=\"none\" stroke=\"#c62f3a\" stroke-width=\"4.5\"\/><rect x=\"690\" y=\"252\" width=\"52\" height=\"47\" rx=\"3\" fill=\"#9e9e9e\" stroke=\"#555\" stroke-width=\"2\"\/><polyline points=\"719,260 709,277 720,277 711,293\" fill=\"none\" stroke=\"#f2b705\" stroke-width=\"3\"\/><circle cx=\"110\" cy=\"86\" r=\"14\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"110\" y=\"91\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"700\" fill=\"#16202b\">1<\/text><circle cx=\"340\" cy=\"182\" r=\"14\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"340\" y=\"187\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"700\" fill=\"#16202b\">2<\/text><circle cx=\"335\" cy=\"326\" r=\"14\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"335\" y=\"331\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"700\" fill=\"#16202b\">3<\/text><circle cx=\"456\" cy=\"204\" r=\"14\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"456\" y=\"209\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"700\" fill=\"#16202b\">4<\/text><circle cx=\"590\" cy=\"284\" r=\"14\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"590\" y=\"289\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"700\" fill=\"#16202b\">5<\/text><circle cx=\"716\" cy=\"236\" r=\"14\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"716\" y=\"241\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"700\" fill=\"#16202b\">6<\/text><\/svg><ol><li>Bucket wheel and boom: the wheel digs material onto the boom conveyor<\/li><li>Superstructure with the drives, switchgear and operator cab<\/li><li>Crawler travel gear: the machine moves along the mine bench<\/li><li>Motorised cable reel on the excavator<\/li><li>The (N)TSCGECEW\u00d6U 12\/20 kV reeling cable, paid out and wound back as the excavator travels<\/li><li>Mine transformer or switching point that feeds the cable<\/li><\/ol><figcaption>How the cable runs, schematic and not to scale: from the mine transformer along the ground to the cable reel on the excavator.<\/figcaption><\/figure>\n<p>At 12\/20 kV the cable has to control the electric field as well as survive the reel. Each power core therefore has a semi-conductive layer on both sides of its EPR insulation and an earthed tinned copper wire screen around it, inside rubber sheaths that keep the core assembly round and flexible. The letters of a designation like this one are explained, as far as the VDE legend defines them, in our <a href=\"https:\/\/tebaoflex-cable.com\/how-to-read-cable-designation-vde-code\/\">guide to reading VDE cable designations<\/a>. The same designation is also built as a submersible pump cable with separate earth cores and a black 5GM3 sheath, described on the <a href=\"https:\/\/tebaoflex-cable.com\/product\/ntscgecewou-submersible-cable\/\">(N)TSCGECEW\u00d6U submersible cable page<\/a>.<\/p>\n<h2>(N)TSCGECEWOEU 12\/20 kV 3\u00d735+3\u00d725\/3: construction and measured dimensions<\/h2>\n<p class=\"tbf-answer\">The (N)TSCGECEW\u00d6U 12\/20 kV cable of this order has three 35 mm\u00b2 Class 5 tinned copper power cores, each with semi-conductive conductor and insulation screens, 3GI3-type EPR insulation and its own tinned copper wire screen; the three screens form the 25 mm\u00b2 protective conductor. A GM1b inner sheath and a red 5GM5 outer sheath complete it. The factory acceptance test measured 5.5 mm of insulation on each core and an overall diameter of 60.57 mm.<\/p>\n<div class=\"tbf-tw\"><table class=\"tbf-wide\"><thead><tr><th>Layer<\/th><th>Specification (test report)<\/th><th>Measured at the factory acceptance test<\/th><\/tr><\/thead><tbody>\n<tr><th>Power conductors<\/th><td>3 \u00d7 35 mm\u00b2, Class 5 flexible tinned copper, DIN VDE 0295 \/ IEC 60228<\/td><td>Conforms (visual check and material certificate)<\/td><\/tr>\n<tr><th>Conductor screen<\/th><td>Semi-conductive rubber screening compound<\/td><td>0.5 mm<\/td><\/tr>\n<tr><th>Insulation<\/th><td>3GI3-type EPR, natural colour; nominal 5.5 mm, minimum 4.95 mm<\/td><td>5.5 mm on cores 1, 2 and 3<\/td><\/tr>\n<tr><th>Insulation screen<\/th><td>Semi-conductive rubber screening compound<\/td><td>0.5 mm<\/td><\/tr>\n<tr><th>Tape over insulation screen<\/th><td>Semi-conductive nylon tape<\/td><td>Conforms (visual check)<\/td><\/tr>\n<tr><th>Individual screens \/ protective conductor<\/th><td>Tinned copper wire screen on each core, 3 \u00d7 25\/3 mm\u00b2<\/td><td>Conforms<\/td><\/tr>\n<tr><th>Tape over the metallic screens<\/th><td>Semi-conductive tape<\/td><td>Conforms (visual check)<\/td><\/tr>\n<tr><th>Inner sheath<\/th><td>GM1b-type EPR compound, natural colour<\/td><td>\u2014<\/td><\/tr>\n<tr><th>Outer sheath<\/th><td>5GM5-type rubber compound, red; nominal 4.0 mm, minimum 3.4 mm<\/td><td>4.31 mm<\/td><\/tr>\n<tr><th>Overall diameter<\/th><td>Nominal 60 mm, maximum 63 mm<\/td><td>60.57 mm<\/td><\/tr>\n<tr><th>Core identification<\/th><td>Cores numbered 1, 2, 3<\/td><td>Not a test report item<\/td><\/tr>\n<tr><th>Sheath print<\/th><td>Inkjet, clear and complete<\/td><td>Pass (part of the legend: \u201c\u2026 3*35+3*25\/3mm\u00b2 DIN VDE Standard Sep 2026\u201d)<\/td><\/tr>\n<\/tbody><\/table><\/div>\n<p class=\"tbf-note\">Specification values are those in the factory acceptance test report for this order, except the conductor class and the 3GI3 insulation grade, which come from the order&#039;s construction sheet. Why flexible reeling cables use EPR rather than XLPE insulation is explained in our <a href=\"https:\/\/tebaoflex-cable.com\/epr-insulation\/#why-flexible\">EPR insulation guide<\/a>.<\/p>\n<figure class=\"tbf-fig\"><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/ntscgecewoeu-12-20kv-cross-section-individual-wire-screens.webp\" alt=\"Cross-section of the 12\/20 kV cable: three 35 mm\u00b2 cores, each with semi-conductive screens and a tinned copper wire screen, in the natural-colour inner sheath\" width=\"1500\" height=\"1406\" loading=\"lazy\" decoding=\"async\"><figcaption>Cross-section of the 12\/20 kV cable: three 35 mm\u00b2 cores, each with its semi-conductive screens and tinned copper wire screen, in the natural-colour inner sheath under the red outer sheath.<\/figcaption><\/figure>\n<div class=\"tbf-xwrap\"><svg class=\"tbf-xsec\" viewBox=\"0 0 560 400\" role=\"img\" aria-labelledby=\"xs8-t\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><title id=\"xs8-t\">Numbered cross-section drawing of the (N)TSCGECEW\u00d6U 12\/20 kV 3\u00d735+3\u00d725\/3 cable in this order<\/title><circle cx=\"200\" cy=\"200\" r=\"175\" fill=\"#c62f3a\" stroke=\"#7e1a22\" stroke-width=\"1.5\"\/><circle cx=\"200\" cy=\"200\" r=\"146\" fill=\"#e9e3d3\"\/><circle cx=\"200\" cy=\"200\" r=\"10\" fill=\"#6d6d6d\"\/><circle cx=\"200.0\" cy=\"132.0\" r=\"57\" fill=\"none\" stroke=\"#9aa1a8\" stroke-width=\"5\" stroke-dasharray=\"2 2.6\"\/><circle cx=\"200.0\" cy=\"132.0\" r=\"53\" fill=\"#202020\"\/><circle cx=\"200.0\" cy=\"132.0\" r=\"50\" fill=\"#f3efe4\"\/><circle cx=\"200.0\" cy=\"132.0\" r=\"25\" fill=\"#202020\"\/><circle cx=\"200.0\" cy=\"132.0\" r=\"22\" fill=\"#d8d2ca\" stroke=\"#b9b0a4\"\/><circle cx=\"141.1\" cy=\"234.0\" r=\"57\" fill=\"none\" stroke=\"#9aa1a8\" stroke-width=\"5\" stroke-dasharray=\"2 2.6\"\/><circle cx=\"141.1\" cy=\"234.0\" r=\"53\" fill=\"#202020\"\/><circle cx=\"141.1\" cy=\"234.0\" r=\"50\" fill=\"#f3efe4\"\/><circle cx=\"141.1\" cy=\"234.0\" r=\"25\" fill=\"#202020\"\/><circle cx=\"141.1\" cy=\"234.0\" r=\"22\" fill=\"#d8d2ca\" stroke=\"#b9b0a4\"\/><circle cx=\"258.9\" cy=\"234.0\" r=\"57\" fill=\"none\" stroke=\"#9aa1a8\" stroke-width=\"5\" stroke-dasharray=\"2 2.6\"\/><circle cx=\"258.9\" cy=\"234.0\" r=\"53\" fill=\"#202020\"\/><circle cx=\"258.9\" cy=\"234.0\" r=\"50\" fill=\"#f3efe4\"\/><circle cx=\"258.9\" cy=\"234.0\" r=\"25\" fill=\"#202020\"\/><circle cx=\"258.9\" cy=\"234.0\" r=\"22\" fill=\"#d8d2ca\" stroke=\"#b9b0a4\"\/><line x1=\"258.9\" y1=\"234.0\" x2=\"452\" y2=\"62\" stroke=\"#16202b\" stroke-width=\"1.2\"\/><circle cx=\"258.9\" cy=\"234.0\" r=\"3\" fill=\"#16202b\"\/><circle cx=\"472\" cy=\"62\" r=\"15\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"472\" y=\"67\" text-anchor=\"middle\" font-size=\"15\" font-weight=\"700\" fill=\"#16202b\">1<\/text><line x1=\"204.1\" y1=\"108.9\" x2=\"452\" y2=\"102\" stroke=\"#16202b\" stroke-width=\"1.2\"\/><circle cx=\"204.1\" cy=\"108.9\" r=\"3\" fill=\"#16202b\"\/><circle cx=\"472\" cy=\"102\" r=\"15\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"472\" y=\"107\" text-anchor=\"middle\" font-size=\"15\" font-weight=\"700\" fill=\"#16202b\">2<\/text><line x1=\"226.2\" y1=\"105.8\" x2=\"452\" y2=\"142\" stroke=\"#16202b\" stroke-width=\"1.2\"\/><circle cx=\"226.2\" cy=\"105.8\" r=\"3\" fill=\"#16202b\"\/><circle cx=\"472\" cy=\"142\" r=\"15\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"472\" y=\"147\" text-anchor=\"middle\" font-size=\"15\" font-weight=\"700\" fill=\"#16202b\">3<\/text><line x1=\"249.7\" y1=\"118.7\" x2=\"452\" y2=\"182\" stroke=\"#16202b\" stroke-width=\"1.2\"\/><circle cx=\"249.7\" cy=\"118.7\" r=\"3\" fill=\"#16202b\"\/><circle cx=\"472\" cy=\"182\" r=\"15\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"472\" y=\"187\" text-anchor=\"middle\" font-size=\"15\" font-weight=\"700\" fill=\"#16202b\">4<\/text><line x1=\"255.1\" y1=\"146.8\" x2=\"452\" y2=\"222\" stroke=\"#16202b\" stroke-width=\"1.2\"\/><circle cx=\"255.1\" cy=\"146.8\" r=\"3\" fill=\"#16202b\"\/><circle cx=\"472\" cy=\"222\" r=\"15\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"472\" y=\"227\" text-anchor=\"middle\" font-size=\"15\" font-weight=\"700\" fill=\"#16202b\">5<\/text><line x1=\"200.0\" y1=\"200.0\" x2=\"452\" y2=\"262\" stroke=\"#16202b\" stroke-width=\"1.2\"\/><circle cx=\"200.0\" cy=\"200.0\" r=\"3\" fill=\"#16202b\"\/><circle cx=\"472\" cy=\"262\" r=\"15\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"472\" y=\"267\" text-anchor=\"middle\" font-size=\"15\" font-weight=\"700\" fill=\"#16202b\">6<\/text><line x1=\"325.5\" y1=\"240.8\" x2=\"452\" y2=\"302\" stroke=\"#16202b\" stroke-width=\"1.2\"\/><circle cx=\"325.5\" cy=\"240.8\" r=\"3\" fill=\"#16202b\"\/><circle cx=\"472\" cy=\"302\" r=\"15\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"472\" y=\"307\" text-anchor=\"middle\" font-size=\"15\" font-weight=\"700\" fill=\"#16202b\">7<\/text><line x1=\"324.1\" y1=\"304.1\" x2=\"452\" y2=\"342\" stroke=\"#16202b\" stroke-width=\"1.2\"\/><circle cx=\"324.1\" cy=\"304.1\" r=\"3\" fill=\"#16202b\"\/><circle cx=\"472\" cy=\"342\" r=\"15\" fill=\"#fff\" stroke=\"#16202b\" stroke-width=\"1.5\"\/><text x=\"472\" y=\"347\" text-anchor=\"middle\" font-size=\"15\" font-weight=\"700\" fill=\"#16202b\">8<\/text><\/svg><ol><li>Power conductor: Class 5 flexible tinned copper, DIN VDE 0295 \/ IEC 60228, 35 mm\u00b2<\/li><li>Conductor screen: semi-conductive rubber, 0.5 mm<\/li><li>Insulation: 3GI3-type EPR, nominal 5.5 mm<\/li><li>Insulation screen: semi-conductive rubber, 0.5 mm, with semi-conductive nylon tape over it<\/li><li>Individual tinned copper wire screen on each core; the three screens together are the 25 mm\u00b2 protective conductor (3\u00d725\/3)<\/li><li>Central rubber filler<\/li><li>Inner sheath: GM1b-type EPR compound<\/li><li>Outer sheath: 5GM5-type rubber compound, red, nominal 4.0 mm<\/li><\/ol><\/div>\n<div class=\"tbf-shots\">\n<figure><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/ntscgecewoeu-sheath-print-3x35-3x25-3-din-vde-sep-2026.webp\" alt=\"Red sheath of the reeling cable with the inkjet print 3*35+3*25\/3mm\u00b2 DIN VDE Standard Sep 2026\" width=\"1600\" height=\"1067\" loading=\"lazy\" decoding=\"async\"><figcaption>Part of the sheath print on the red outer sheath: \u2026 3*35+3*25\/3mm\u00b2 DIN VDE Standard Sep 2026.<\/figcaption><\/figure>\n<figure><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/mv-reeling-cable-sheath-removed-screened-cores.webp\" alt=\"Sheath removed at the drum end: the screened cores under the red outer sheath\" width=\"1600\" height=\"1200\" loading=\"lazy\" decoding=\"async\"><figcaption>Outer sheath removed at a drum end, showing the screened cores.<\/figcaption><\/figure>\n<\/div>\n<h2>What does 3\u00d735+3\u00d725\/3 mean on this medium-voltage reeling cable?<\/h2>\n<p class=\"tbf-answer\">The marking 3\u00d735+3\u00d725\/3 means three 35 mm\u00b2 power cores plus a 25 mm\u00b2 protective conductor divided into three equal parts. In this (N)TSCGECEW\u00d6U cable each part is the tinned copper wire screen around one power core, so the cable has no separate earth cores: every core carries its own earthed screen, and the three screens together are the protective conductor.<\/p>\n<p>That arrangement matters at 12\/20 kV. Each power core is enclosed by its own earthed wire screen, so the electric field stays inside that core&#039;s insulation and an insulation fault goes straight to earth through the screen around it. The protective conductor is shared equally by the three cores, and the inner sheath fills the gaps between them to give the round, solid core assembly a reel needs. For comparison, the low-voltage reeling cable the same buyer ordered carries its protective conductor as three separate green-yellow cores in the outer gaps, as described in the <a href=\"https:\/\/tebaoflex-cable.com\/cases\/stacker-reclaimer-reeling-cable-nshtoeu-j-poland\/\">(N)SHT\u00d6U-J stacker-reclaimer case record<\/a>.<\/p>\n<div class=\"tbf-shots\">\n<figure><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/tinned-copper-wire-screen-mv-reeling-cable.webp\" alt=\"Tinned copper wires of the screen around one core: the three screens together form the 25 mm\u00b2 protective conductor\" width=\"1600\" height=\"1200\" loading=\"lazy\" decoding=\"async\"><figcaption>Tinned copper wires of the screen around one core. The three screens together form the 25 mm\u00b2 protective conductor.<\/figcaption><\/figure>\n<figure><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/semi-conductive-tape-over-mv-cable-insulation.webp\" alt=\"Semi-conductive tape over the tinned copper wire screen of a 12\/20 kV core, peeled back\" width=\"1600\" height=\"1200\" loading=\"lazy\" decoding=\"async\"><figcaption>Semi-conductive tape over the tinned copper wire screen of a core, peeled back.<\/figcaption><\/figure>\n<\/div>\n<h2>How are the three medium-voltage power cores identified at the excavator and the transformer?<\/h2>\n<p class=\"tbf-answer\">Each 35 mm\u00b2 power core of the (N)TSCGECEW\u00d6U 12\/20 kV cable in this Polish bucket-wheel excavator order is numbered 1, 2 or 3 on its insulation. The buyer asked how the installer would tell the cores apart when connecting the excavator and the transformer; the numbers let each core be matched to the same phase at both ends without tracing it through the cable.<\/p>\n<div class=\"tbf-shots\">\n<figure><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/mv-reeling-cable-cores-printed-1-2-3-identification.webp\" alt=\"The three 35 mm\u00b2 power cores cut from a drum end, numbered 1, 2 and 3 for phase identification\" width=\"1600\" height=\"1200\" loading=\"lazy\" decoding=\"async\"><figcaption>Power cores cut from a drum end, numbered 1, 2 and 3.<\/figcaption><\/figure>\n<figure><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/cutting-sample-from-12-20kv-reeling-cable-drum.webp\" alt=\"Cutting a sample from the end of a finished drum for the section and thickness checks\" width=\"1600\" height=\"1200\" loading=\"lazy\" decoding=\"async\"><figcaption>Cutting a sample at the drum end for the section and thickness checks.<\/figcaption><\/figure>\n<\/div>\n<h2>12\/20 kV cable factory acceptance test: 29 kV voltage test, partial discharge, resistance and dimensions<\/h2>\n<p class=\"tbf-answer\">The factory acceptance test report for this (N)TSCGECEW\u00d6U 12\/20 kV order covers both drums, 500 m and 480 m, with one set of results: an AC voltage test at 29 kV for 5 minutes without breakdown, a partial discharge measurement of 2.0 pC against a 10 pC limit, conductor resistance of 0.529 \u03a9\/km against the 0.565 \u03a9\/km limit, insulation resistance, continuity, layer thicknesses, overall diameter, printing and drum length. The buyer&#039;s QC inspector witnessed the tests on 27 September 2026.<\/p>\n<div class=\"tbf-tw\"><table class=\"tbf-wide\"><thead><tr><th>Test<\/th><th>Requirement (test report)<\/th><th>Result<\/th><\/tr><\/thead><tbody>\n<tr><th>AC voltage test, resonant test set<\/th><td>29 kV AC for 5 minutes, no breakdown<\/td><td>No breakdown<\/td><\/tr>\n<tr><th>Partial discharge, series resonance PD system in a shielded test room<\/th><td>\u2264 10 pC<\/td><td>2.0 pC<\/td><\/tr>\n<tr><th>Conductor DC resistance, 35 mm\u00b2<\/th><td>\u2264 0.565 \u03a9\/km at 20 \u00b0C (IEC 60228, Class 5, tinned copper)<\/td><td>0.529 \u03a9\/km<\/td><\/tr>\n<tr><th>Insulation resistance<\/th><td>\u2265 20 M\u03a9\u00b7km<\/td><td>Needle at about 5,000 M\u03a9 at 2.5 kV DC<\/td><\/tr>\n<tr><th>Continuity<\/th><td>Each power core continuous<\/td><td>Pass<\/td><\/tr>\n<tr><th>Insulation thickness<\/th><td>Nominal 5.5 mm, minimum 4.95 mm<\/td><td>5.5 mm on each core<\/td><\/tr>\n<tr><th>Conductor and insulation screens<\/th><td>Semi-conductive<\/td><td>0.5 mm each<\/td><\/tr>\n<tr><th>Outer sheath thickness<\/th><td>Nominal 4.0 mm, minimum 3.4 mm<\/td><td>4.31 mm<\/td><\/tr>\n<tr><th>Overall diameter<\/th><td>Nominal 60 mm, maximum 63 mm<\/td><td>60.57 mm<\/td><\/tr>\n<tr><th>Printing<\/th><td>Inkjet, clear and complete<\/td><td>Pass<\/td><\/tr>\n<tr><th>Drum length<\/th><td>500 m per drum, checked by the meter marking on the sheath<\/td><td>500 m and 480 m (one drum shortened by 20 m, see below)<\/td><\/tr>\n<\/tbody><\/table><\/div>\n<h3>AC voltage test: 29 kV for 5 minutes<\/h3>\n<p>The cable was connected to a resonant test set and held at 29 kV AC for 5 minutes, the test voltage set in the report for this 12\/20 kV order. There was no breakdown. A breakdown would show a weak point anywhere in the insulation of the full drum length.<\/p>\n<div class=\"tbf-shots\">\n<figure><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/mv-reeling-cable-termination-voltage-test-connection.webp\" alt=\"Cable end prepared and connected to the series resonance test set for the AC voltage and partial discharge tests\" width=\"1600\" height=\"1200\" loading=\"lazy\" decoding=\"async\"><figcaption>Cable end prepared and connected to the resonant test set.<\/figcaption><\/figure>\n<figure><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/finished-drum-shielded-partial-discharge-test-room.webp\" alt=\"Finished drum of 12\/20 kV reeling cable on the stand inside the shielded partial discharge test room\" width=\"1600\" height=\"1200\" loading=\"lazy\" decoding=\"async\"><figcaption>A finished drum inside the shielded partial discharge test room.<\/figcaption><\/figure>\n<\/div>\n<h3>Insulation resistance and continuity<\/h3>\n<p>The insulation tester applies a DC test voltage, shown on its digital display (2.54 kV here); the resistance is read on the analogue scale, where the needle stood at about 5,000 M\u03a9. Insulation resistance per kilometre is the reading multiplied by the length in kilometres, so a 5,000 M\u03a9 reading meets the report&#039;s 20 M\u03a9\u00b7km minimum on any length above 4 m. Continuity was checked on each power core at the drum ends.<\/p>\n<figure class=\"tbf-fig\"><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/insulation-resistance-test-12-20kv-reeling-cable-2500v.webp\" alt=\"Insulation resistance test on the finished drum: 2.54 kV DC test voltage on the display, needle near 5,000 M\u03a9\" width=\"1600\" height=\"1200\" loading=\"lazy\" decoding=\"async\"><figcaption>Insulation tester on the finished drum: 2.54 kV DC on the display, the needle near 5,000 M\u03a9.<\/figcaption><\/figure>\n<h3>Dimensions: insulation, screens and overall diameter<\/h3>\n<p>Slices cut from the drum end were measured for insulation, screen and sheath thickness; the photographs show an insulation slice on the measuring projector and a dial thickness gauge on the insulation screen, and the report lists micrometer and caliper readings. The insulation measured 5.5 mm on each core, both semi-conductive screens 0.5 mm, the outer sheath 4.31 mm and the overall diameter 60.57 mm.<\/p>\n<div class=\"tbf-shots\">\n<figure><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/insulation-thickness-check-measuring-projector-12-20kv.webp\" alt=\"Insulation slice of a 12\/20 kV core on the measuring projector for the thickness check\" width=\"1600\" height=\"1200\" loading=\"lazy\" decoding=\"async\"><figcaption>Insulation slice on the measuring projector.<\/figcaption><\/figure>\n<figure><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/insulation-screen-thickness-dial-gauge-0-5-mm.webp\" alt=\"Dial thickness gauge on the insulation screen of a core, reading 0.50 mm\" width=\"1600\" height=\"1200\" loading=\"lazy\" decoding=\"async\"><figcaption>Dial thickness gauge on the insulation screen, reading 0.50 mm.<\/figcaption><\/figure>\n<\/div>\n<h2>Partial discharge test on a medium-voltage reeling cable: what 2.0 pC means<\/h2>\n<p class=\"tbf-answer\">Partial discharge is a localised electrical discharge that only partly bridges the insulation, typically in a gas-filled void, at a contaminant or protrusion, or at a gap between the insulation and a semi-conductive screen. Measured as apparent charge in picocoulombs (pC), it reveals defects that can pass a voltage withstand test but erode the insulation over years. The 12\/20 kV cable of this order measured 2.0 pC against the 10 pC limit in its factory acceptance test report.<\/p>\n<p>The measurement was made in a shielded test room, which keeps outside electrical noise out of a reading of a few picocoulombs. The photograph is a snapshot of the panel taken during the test, with 1.2 pC on the discharge meter and 19.6 kV on the voltage meter; the result entered in the report is 2.0 pC.<\/p>\n<figure class=\"tbf-fig\"><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/partial-discharge-meter-1-2-pc-at-19-6-kv.webp\" alt=\"Partial discharge test panel: discharge magnitude 1.2 pC with the test voltage at 19.6 kV\" width=\"1600\" height=\"1200\" loading=\"lazy\" decoding=\"async\"><figcaption>Partial discharge panel during the test: 1.2 pC on the discharge meter, 19.6 kV on the voltage meter.<\/figcaption><\/figure>\n<h2>What should a factory test report for a medium-voltage reeling cable include?<\/h2>\n<p class=\"tbf-answer\">A factory test report for a medium-voltage reeling cable should give measured values beside each requirement, not only pass\/fail. The Polish buyer of this 12\/20 kV cable asked for the tests on each drum, conductor and protective-conductor resistance corrected to 20 \u00b0C, the voltage test result, insulation resistance, the verified dimensions, and partial discharge and screen inspection results, sent for acceptance before shipment, with a Declaration of Conformity in the delivery documents.<\/p>\n<ol class=\"tbf-list\">\n<li><strong>Every drum or production length covered<\/strong>, with the lengths stated, so the buyer can see which drums the readings apply to.<\/li>\n<li><strong>Measured values beside each requirement<\/strong>: conductor and protective-conductor resistance corrected to 20 \u00b0C, the test voltage and duration, insulation resistance, partial discharge level, layer thicknesses and overall diameter.<\/li>\n<li><strong>Screen inspection<\/strong> for medium-voltage cables: semi-conductive screens and the metallic screen or braid checked for continuity and construction.<\/li>\n<li><strong>Test methods and equipment<\/strong>, so the buyer can see how each value was obtained.<\/li>\n<li><strong>The report before shipment<\/strong>, for verification and acceptance, and a Declaration of Conformity with the delivery documents.<\/li>\n<\/ol>\n<p>This order&#039;s report covers both drums, 500 m and 480 m, in one table: it gives measured values for the semi-conductive screens, insulation, outer sheath, overall diameter, insulation resistance, conductor resistance and partial discharge, and pass results for the other items, including the AC voltage test, continuity, printing and length.<\/p>\n<p>The buyer had first received a template showing the planned tests. It did not list every item their requirements covered, and the buyer asked for the full range. TEBAOFLEX marked the key tests on that template in yellow so the buyer could check that their requirements were covered, and sent the final report with the measured values after the witnessed test. Which standard, edition and acceptance records to name in a medium-voltage mining cable enquiry is covered in step 7 of our <a href=\"https:\/\/tebaoflex-cable.com\/medium-voltage-mining-cable-selection-guide\/\">medium-voltage mining cable selection guide<\/a>.<\/p>\n<h2>Witnessed FAT: what the buyer&#039;s QC inspector saw at the factory<\/h2>\n<p class=\"tbf-answer\">On 27 September 2026 the buyer&#039;s QC inspector visited the TEBAOFLEX factory and witnessed the factory acceptance test of the (N)TSCGECEW\u00d6U 12\/20 kV drums: the AC voltage and partial discharge tests in the shielded test room, the insulation resistance and continuity checks, sample cutting, thickness measurements, and the strip checks of the conductor and screens.<\/p>\n<div class=\"tbf-shots\">\n<figure><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/mv-reeling-cable-stripped-cores-tinned-conductor.webp\" alt=\"Core ends cut at a drum end: conductor, EPR insulation and the black semi-conductive screens\" width=\"1600\" height=\"1200\" loading=\"lazy\" decoding=\"async\"><figcaption>Core ends cut at a drum end: conductor, EPR insulation and the black semi-conductive screens.<\/figcaption><\/figure>\n<figure><img loading=\"lazy\" src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/tinned-copper-conductor-strands-12-20kv-cable-scaled.webp\" alt=\"Conductor strands splayed at the cable end: tinned copper, silver along every strand\" width=\"2560\" height=\"1121\" loading=\"lazy\" decoding=\"async\"><figcaption>Conductor strands splayed at the cable end: tinned copper, silver along every strand.<\/figcaption><\/figure>\n<\/div>\n<h2>How do you check that the conductor and the screen wires are tinned copper?<\/h2>\n<p class=\"tbf-answer\">Strip the core and look along the conductor strands and the screen wires: tinned copper is silver-grey over its whole length, bare copper is copper-red. The resistance test then shows the conductor meets the limit for its size: the 35 mm\u00b2 conductor of this order measured 0.529 \u03a9\/km in the factory acceptance test report, within the 0.565 \u03a9\/km maximum at 20 \u00b0C that IEC 60228 sets for a 35 mm\u00b2 Class 5 tinned conductor.<\/p>\n<p>Look at the strand surfaces after stripping, not at a saw-cut face, which shows the copper core of every strand even on tinned wire. Resistance alone cannot tell tinned from plain copper either: for 35 mm\u00b2 Class 5 conductors the IEC 60228 limits are 0.554 \u03a9\/km for plain copper and 0.565 \u03a9\/km for tinned copper, only about 2% apart, and a conductor of either kind usually measures below both, as this one did.<\/p>\n<h2>How do you confirm a medium-voltage reeling cable has no broken conductors?<\/h2>\n<p class=\"tbf-answer\">Continuity and voltage tests on the complete drum confirm that a medium-voltage reeling cable has no broken conductors. Each power core of this 12\/20 kV cable was checked for continuity end to end, and the full drum length held 29 kV AC for 5 minutes and passed the partial discharge measurement. A conductor broken right through fails the continuity check, and insulation damaged badly enough to break down or discharge fails the voltage or partial discharge test. Broken single strands or a well-made repair can still pass, so the tests show the drum has no open conductors or insulation faults rather than proving it was never repaired.<\/p>\n<p>The drums of this order were supplied as continuous lengths without joints.<\/p>\n<h2>Why one drum shipped at 480 m: the first 20 m were cut off<\/h2>\n<p class=\"tbf-answer\">The Polish bucket-wheel excavator order was for two 500 m drums of (N)TSCGECEW\u00d6U 12\/20 kV cable. On one production length, the first 20 m or so of red sheath came out of the vulcanisation line with uneven colour, because pigment from the previous batch was still in the extrusion head; after that stretch the colour was even. TEBAOFLEX judged the difference cosmetic but cut the 20 m off rather than ship it, and the drum went out at 480 m after passing the same factory acceptance test.<\/p>\n<p>The buyer asked for an explanation of the short drum, and this was it. TEBAOFLEX explained the cause, the cut and the remaining length to the buyer in writing, and the test report covers both drums, 500 m and 480 m.<\/p>\n<figure class=\"tbf-vid\"><video controls muted playsinline preload=\"none\" poster=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/ntscgecewoeu-12-20kv-video-poster.webp\" width=\"1280\" height=\"578\" aria-label=\"Close-up video of the (N)TSCGECEW\u00d6U 12\/20 kV reeling cable: cut end, sheath print and sample label\"><source src=\"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/ntscgecewoeu-12-20kv-reeling-cable-cross-section-and-sheath-print.mp4\" type=\"video\/mp4\"><\/video><figcaption>The cable of this order: cut end, sheath print and sample label (20 s, no sound).<\/figcaption><\/figure>\n<h2>What to send us for a bucket-wheel excavator reeling cable quote<\/h2>\n<div class=\"tbf-need\"><strong>Send us these and we can check the construction and the test plan before quoting.<\/strong> Other medium-voltage reeling constructions are on our <a href=\"https:\/\/tebaoflex-cable.com\/product\/r-ntscgewou-reeling-cable\/\">medium-voltage reeling cable product page<\/a>. An 8.7\/15 kV reeling cable with 24 optical fibres for a ship unloader is documented on the <a href=\"https:\/\/tebaoflex-cable.com\/cases\/vietnam-duyen-hai-2-ship-unloader-reeling-cable\/\">ship unloader reeling cable case page<\/a>.\n<ul>\n<li>Machine and reel (bucket-wheel excavator, spreader, shovel; reel drive, for example motorised, and winding, for example monospiral or multi-layer)<\/li>\n<li>Rated voltage U\u2080\/U and the system it feeds<\/li>\n<li>Conductor arrangement: power cores, protective conductor, control cores or fibres<\/li>\n<li>The standard the order must be built and tested to<\/li>\n<li>Length per drum and number of drums<\/li>\n<li>Reel core diameter and maximum cable diameter<\/li>\n<li>Travel speed and number of layers on the reel<\/li>\n<li>Lowest and highest site temperature<\/li>\n<li>Tests you want to witness, and the partial discharge limit and test voltage<\/li>\n<li>Documents required: test report per drum, Declaration of Conformity<\/li>\n<\/ul><\/div>\n<h2>Questions on bucket-wheel excavator reeling cable<\/h2>\n<div class=\"tbf-faq\">\n<details><summary>What does 3\u00d735+3\u00d725\/3 mean on a medium-voltage reeling cable?<\/summary><p>Three 35 mm\u00b2 power cores plus a 25 mm\u00b2 protective conductor that is divided into three equal parts. In the (N)TSCGECEW\u00d6U cable of this order each part is the tinned copper wire screen around one power core, so every core carries its own screen and the three screens together form the protective conductor.<\/p><\/details>\n<details><summary>Is (N)TSCGECEW\u00d6U a VDE-certified cable?<\/summary><p>No. TEBAOFLEX writes (N) in front of the designation to mark a construction built with reference to the DIN VDE 0250 series, here DIN VDE 0250-813 as the buyer specified, rather than an approved VDE standard type; it is not a VDE certification mark. The test values for this order are those in its factory acceptance test report.<\/p><\/details>\n<details><summary>What partial discharge level is acceptable for a 12\/20 kV reeling cable?<\/summary><p>The factory acceptance test report for this order set a limit of 10 pC, and the cable measured 2.0 pC. Agree the limit and the test voltage in the order specification, because they depend on the standard the project works to.<\/p><\/details>\n<details><summary>How are the three power cores of a medium-voltage cable identified?<\/summary><p>On this cable each 35 mm\u00b2 power core is numbered 1, 2 or 3 on its insulation, so the installer can connect each core to the same phase at the excavator and at the transformer.<\/p><\/details>\n<details><summary>Can the buyer witness the factory acceptance test?<\/summary><p>On this order the buyer&#039;s QC inspector witnessed the factory acceptance test at the TEBAOFLEX factory on 27 September 2026. State in the enquiry which tests you want to witness and which documents you need with the delivery.<\/p><\/details>\n<details><summary>Why did one drum ship at 480 m instead of 500 m?<\/summary><p>The first 20 m or so of that production length came out of the vulcanisation line with uneven sheath colour, caused by pigment left in the extrusion head from the previous batch. TEBAOFLEX judged the colour difference cosmetic but cut the section off rather than ship it, and the remaining 480 m went through the same factory acceptance test.<\/p><\/details>\n<\/div>\n<div class=\"tbf-byline\">Project record prepared by <a href=\"https:\/\/tebaoflex-cable.com\/author\/zheng-lipeng\/\">Zheng LiPeng<\/a>, Manager, with the TEBAOFLEX cable engineering team. TEBAOFLEX is a special-cable factory in Taicang, Jiangsu, founded in 2014, with 12 production lines from rubber mixing to cabling and 8 sets of test equipment (as of September 2026). More about the factory on our <a href=\"https:\/\/tebaoflex-cable.com\/about-us\/\">about us page<\/a>.<\/div>\n<p><a class=\"tbf-cta\" href=\"https:\/\/tebaoflex-cable.com\/contact-us\/#request-quote\">Send your reel data and test plan for a quote &rarr;<\/a><\/p>\n<div class=\"tbf-back\"><a href=\"https:\/\/tebaoflex-cable.com\/cases\/\">&larr; Back to all industrial cable application cases<\/a><\/div>\n<\/div>\n\n<script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"Article\", \"headline\": \"Bucket-Wheel Excavator Reeling Cable for a Polish Mine: 12\/20 kV (N)TSCGECEW\u00d6U with a Witnessed Factory Test\", \"description\": \"Bucket wheel excavator reeling cable for a Polish mine: (N)TSCGECEW\u00d6U 12\/20 kV 3\u00d735+3\u00d725\/3, witnessed FAT with 29 kV, 2.0 pC partial discharge and photos.\", \"mainEntityOfPage\": {\"@type\": \"WebPage\", \"@id\": \"https:\/\/tebaoflex-cable.com\/cases\/bucket-wheel-excavator-reeling-cable-12-20kv-poland\/\"}, \"url\": \"https:\/\/tebaoflex-cable.com\/cases\/bucket-wheel-excavator-reeling-cable-12-20kv-poland\/\", \"inLanguage\": \"en\", \"image\": [{\"@type\": \"ImageObject\", \"url\": \"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/bucket-wheel-excavator-reeling-cable-case-og-1200x630-1.webp\", \"width\": 1200, \"height\": 630}, {\"@type\": \"ImageObject\", \"url\": \"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/10\/ntscgecewoeu-12-20kv-3x35-3x25-3-reeling-cable-cross-section-red.webp\", \"width\": 1600, \"height\": 900}], \"author\": {\"@type\": \"Person\", \"@id\": \"https:\/\/tebaoflex-cable.com\/author\/zheng-lipeng\/\", \"name\": \"Zheng LiPeng\", \"url\": \"https:\/\/tebaoflex-cable.com\/author\/zheng-lipeng\/\", \"jobTitle\": \"Manager\", \"image\": \"https:\/\/tebaoflex-cable.com\/wp-content\/uploads\/2026\/09\/tebaoflex-author-headshot-100x100.jpg\", \"sameAs\": [\"https:\/\/www.linkedin.com\/in\/tebaoflexcable\/\"], \"worksFor\": {\"@id\": \"https:\/\/tebaoflex-cable.com\/#organization\"}}, \"publisher\": {\"@type\": \"Organization\", \"@id\": \"https:\/\/tebaoflex-cable.com\/#organization\", \"name\": \"TEBAOFLEX\", \"url\": \"https:\/\/tebaoflex-cable.com\/\"}, \"about\": [\"Bucket-wheel excavator reeling cable\", \"(N)TSCGECEW\u00d6U 12\/20 kV medium-voltage reeling cable\", \"Partial discharge test\", \"Factory acceptance test\"], \"mentions\": [{\"@id\": \"https:\/\/tebaoflex-cable.com\/product\/ntscgecewou-submersible-cable\/#product\"}], \"datePublished\": \"2026-10-06\", \"dateModified\": \"2026-10-06\"}<\/script>\n<script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does 3\u00d735+3\u00d725\/3 mean on a medium-voltage reeling cable?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Three 35 mm\u00b2 power cores plus a 25 mm\u00b2 protective conductor that is divided into three equal parts. In the (N)TSCGECEW\u00d6U cable of this order each part is the tinned copper wire screen around one power core, so every core carries its own screen and the three screens together form the protective conductor.\"}}, {\"@type\": \"Question\", \"name\": \"Is (N)TSCGECEW\u00d6U a VDE-certified cable?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No. TEBAOFLEX writes (N) in front of the designation to mark a construction built with reference to the DIN VDE 0250 series, here DIN VDE 0250-813 as the buyer specified, rather than an approved VDE standard type; it is not a VDE certification mark. The test values for this order are those in its factory acceptance test report.\"}}, {\"@type\": \"Question\", \"name\": \"What partial discharge level is acceptable for a 12\/20 kV reeling cable?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The factory acceptance test report for this order set a limit of 10 pC, and the cable measured 2.0 pC. Agree the limit and the test voltage in the order specification, because they depend on the standard the project works to.\"}}, {\"@type\": \"Question\", \"name\": \"How are the three power cores of a medium-voltage cable identified?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"On this cable each 35 mm\u00b2 power core is numbered 1, 2 or 3 on its insulation, so the installer can connect each core to the same phase at the excavator and at the transformer.\"}}, {\"@type\": \"Question\", \"name\": \"Can the buyer witness the factory acceptance test?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"On this order the buyer's QC inspector witnessed the factory acceptance test at the TEBAOFLEX factory on 27 September 2026. State in the enquiry which tests you want to witness and which documents you need with the delivery.\"}}, {\"@type\": \"Question\", \"name\": \"Why did one drum ship at 480 m instead of 500 m?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The first 20 m or so of that production length came out of the vulcanisation line with uneven sheath colour, caused by pigment left in the extrusion head from the previous batch. TEBAOFLEX judged the colour difference cosmetic but cut the section off rather than ship it, and the remaining 480 m went through the same factory acceptance test.\"}}]}<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Kep\u00e7e tekerlekli ekskavat\u00f6r tambur kablosu, Polonya&#039;daki bir maden i\u00e7in: (N)TSCGECEW\u00d6U 12\/20 kV 3\u00d735+3\u00d725\/3, 29 kV ve 2.0 pC k\u0131smi de\u015farj de\u011ferleriyle yerinde izlenen FAT ve foto\u011fraflar.<\/p>","protected":false},"author":1,"featured_media":5233,"parent":3117,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-5251","page","type-page","status-publish","has-post-thumbnail","hentry"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/tebaoflex-cable.com\/tr\/wp-json\/wp\/v2\/pages\/5251","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tebaoflex-cable.com\/tr\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/tebaoflex-cable.com\/tr\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/tebaoflex-cable.com\/tr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tebaoflex-cable.com\/tr\/wp-json\/wp\/v2\/comments?post=5251"}],"version-history":[{"count":2,"href":"https:\/\/tebaoflex-cable.com\/tr\/wp-json\/wp\/v2\/pages\/5251\/revisions"}],"predecessor-version":[{"id":5354,"href":"https:\/\/tebaoflex-cable.com\/tr\/wp-json\/wp\/v2\/pages\/5251\/revisions\/5354"}],"up":[{"embeddable":true,"href":"https:\/\/tebaoflex-cable.com\/tr\/wp-json\/wp\/v2\/pages\/3117"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tebaoflex-cable.com\/tr\/wp-json\/wp\/v2\/media\/5233"}],"wp:attachment":[{"href":"https:\/\/tebaoflex-cable.com\/tr\/wp-json\/wp\/v2\/media?parent=5251"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}