{"id":9861,"date":"2026-04-01T17:20:53","date_gmt":"2026-04-01T09:20:53","guid":{"rendered":"https:\/\/feichuncables.com\/blog\/?p=9861"},"modified":"2026-04-01T17:20:58","modified_gmt":"2026-04-01T09:20:58","slug":"buflex-sc","status":"publish","type":"post","link":"https:\/\/feichuncables.com\/blog\/buflex-sc\/","title":{"rendered":"BUFLEX\u00ae-SC"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Extra-Flexible Single-Core Polyurethane (PUR) Medium Voltage Cable with FC-EZS<strong><sup>\u2122<\/sup><\/strong>&nbsp;Easy-Strip Semi-Conductive Technology, Aramid-Reinforced Outer Sheath, and Tongling Premium Copper for Compact Switchgear, Mobile Substations, and MV Jumper Applications<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img data-dominant-color=\"8c8e8c\" data-has-transparency=\"false\" loading=\"lazy\" decoding=\"async\" width=\"471\" height=\"628\" sizes=\"auto, (max-width: 471px) 100vw, 471px\" src=\"https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/8c518c05d9c74a169ba2d576aa1d1db9-471x628.avif\" alt=\"\" class=\"wp-image-9862 not-transparent\" style=\"--dominant-color: #8c8e8c; width:640px;height:auto\" title=\"\" srcset=\"https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/8c518c05d9c74a169ba2d576aa1d1db9-471x628.avif 471w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/8c518c05d9c74a169ba2d576aa1d1db9-225x300.avif 225w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/8c518c05d9c74a169ba2d576aa1d1db9-768x1024.avif 768w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/8c518c05d9c74a169ba2d576aa1d1db9-1152x1536.avif 1152w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/8c518c05d9c74a169ba2d576aa1d1db9-1536x2048.avif 1536w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/8c518c05d9c74a169ba2d576aa1d1db9-400x533.avif 400w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/8c518c05d9c74a169ba2d576aa1d1db9-800x1067.avif 800w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/8c518c05d9c74a169ba2d576aa1d1db9-832x1109.avif 832w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/8c518c05d9c74a169ba2d576aa1d1db9-1664x2219.avif 1664w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/8c518c05d9c74a169ba2d576aa1d1db9-1248x1664.avif 1248w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/8c518c05d9c74a169ba2d576aa1d1db9-2496x3328.avif 2496w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/8c518c05d9c74a169ba2d576aa1d1db9-scaled.avif 1920w\" \/><\/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>BUFLEX\u00ae-SC DIN VDE Medium Voltage Single-Core PUR Cable: Aramid-Reinforced Polyurethane with FC-EZS\u2122 Easy-Strip Semi-Conductive Layer and Tongling Premium Copper for Compact Switchgear, Mobile Substations, MV Jumper Cables, and Festoon Systems | FeiChun Cable<\/title>\n<meta name=\"description\" content=\"DIN VDE compliant BUFLEX\u00ae-SC medium voltage single-core polyurethane (PUR) cable rated 1.8\/3 kV to 18\/30 kV. FC-EZS\u2122 Easy-Strip semi-conductive layer eliminates termination failures. Aramid fiber-reinforced PUR outer sheath. Tongling 99.97% purity copper conductors. Triple-extrusion EPR insulation via CCV. Designed for compact switchgear routing, mobile transformer substations, MV jumper cables, and festoon\/reeling systems. Nexans BUFLEX-SC alternative with 4\u20138 week lead times.\">\n<meta name=\"keywords\" content=\"BUFLEX SC replacement, Nexans BUFLEX alternative, BUFLEX SC cable, PUR single core MV, polyurethane medium voltage cable, single core flexible MV, mobile substation cable, switchgear connection cable, MV jumper cable, Feichun PUR cable, Feichun special cable, Chinese premium MV cable, import substitution MV, 12\/20kV PUR single core, 6\/10kV flexible cable, 18\/30kV single core PUR, EPR insulated PUR cable, red polyurethane cable, continuous flexing PUR, dynamic load single core, screened MV single core, copper braid PUR cable, high abrasion MV cable, oil resistant PUR cable, UV resistant MV cable, weather resistant PUR, port terminal electrification, flexible copper class 5 MV, heavy machinery wiring, industrial heavy flex PUR, European standard equivalent, Prysmian PUR alternative, Draka MV equivalent, Lapp medium voltage PUR, TF Kable PUR alternative, sanction free MV cable, direct factory PUR cable, thin jacket single core, mechanical stress PUR, offshore substation cable, compact switchgear wiring, Feichun engineering solutions, CCV line MV cable, easy strip semi conductive, corona resistant PUR cable, robust industrial PUR cable, flexible power transmission, short circuit proof cable, high voltage jumper cable, temporary power MV cable, easy strip semi-con, void free termination, easy peel semi-conductive, MV cable termination, single core reeling cable, single core festoon cable, mobile transformer cable, mine MV jumper cable, rail MV jumper cable, compact MV cable, tight bending radius MV, 6x OD bending radius, 10x OD dynamic bending, aramid reinforced single core, Tongling copper MV cable, premium copper conductor, low resistance single core, anti oxidation copper, FC-EZS semi-conductive, FC-ASB aramid PUR, ballistic grade cable, bulletproof cable jacket, para-aramid cable, Kevlar reinforced cable, Class 5 flexible conductor, extra flexible MV cable, CCV triple extrusion, zero air void cable, partial discharge tested, corona discharge proof, EMI shielded cable, concentric copper screen, copper wire braid screen, earth fault rated cable, temporary mine power, emergency power cable, disaster recovery cable, portable substation cable, modular substation cable, containerised substation cable, wind farm MV cable, solar farm MV cable, renewable energy cable, data centre MV cable, semiconductor fab cable, pharmaceutical MV cable, cleanroom power cable\">\n<meta name=\"author\" content=\"Anhui Feichun Special Cable Co., Ltd.\">\n<meta name=\"robots\" content=\"index,follow\">\n<meta property=\"og:title\" content=\"BUFLEX\u00ae-SC \u2014 Single-Core PUR Medium Voltage Cable with FC-EZS\u2122 Easy-Strip Technology, Aramid Reinforcement, and Tongling Premium Copper for Compact Switchgear, Mobile Substations, and MV Jumper Applications\">\n<meta property=\"og:description\" content=\"Advanced single-core polyurethane (PUR) medium voltage cable rated 1.8\/3 kV to 18\/30 kV featuring FC-EZS\u2122 Easy-Strip semi-conductive layer for void-free terminations, aramid fiber-reinforced PUR outer sheath, Tongling-sourced 99.97% purity copper conductors, triple-extrusion EPR insulation, and concentric copper braid screening. 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var(--b-light);font-size:.74rem;color:var(--c-tertiary);text-align:center;line-height:1.55;word-wrap:break-word;overflow-wrap:break-word}.tm{font-size:.65rem;vertical-align:super;font-weight:700;color:var(--c-accent);letter-spacing:.02em}@media(max-width:600px){.page-wrap{padding:1.2rem 1rem 3rem}.hdr h1{font-size:1.35rem}.tw{font-size:.78rem;width:100%;overflow-x:auto}.cg{grid-template-columns:1fr}}<\/style>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"TechArticle\",\n  \"headline\": \"BUFLEX\u00ae-SC DIN VDE Medium Voltage Single-Core PUR Cable with FC-EZS\u2122 Easy-Strip Semi-Conductive Layer, Aramid-Reinforced Outer Sheath, and Tongling Premium Copper Conductors\",\n  \"description\": \"Comprehensive technical guide to BUFLEX-SC medium voltage single-core polyurethane (PUR) cable, rated 1.8\/3 kV to 18\/30 kV, featuring FC-EZS\u2122 Easy-Strip semi-conductive layer for void-free field terminations, FC-ASB\u2122 aramid fiber-reinforced PUR outer sheath for bulletproof-grade mechanical protection, Tongling-sourced 99.97% purity electrolytic copper conductors for ultra-low resistance, triple-extrusion EPR insulation via CCV lines, and concentric copper braid screening for compact switchgear, mobile substations, MV jumper cables, and festoon systems.\",\n  \"author\": {\"@type\": \"Organization\", \"name\": \"Anhui Feichun Special Cable Co., Ltd.\"},\n  \"publisher\": {\"@type\": \"Organization\", \"name\": \"Anhui Feichun Special Cable Co., Ltd.\"},\n  \"datePublished\": \"2026-04-01\",\n  \"dateModified\": \"2026-04-01\"\n}\n<\/script>\n<\/head>\n<body>\n<div class=\"page-wrap\">\n\n  <header class=\"hdr\">\n    <span class=\"badge\">DIN VDE \u2014 Single-Core PUR Medium Voltage<\/span>\n    <h1>BUFLEX<span class=\"tm\">\u00ae<\/span>-SC<\/h1>\n    <p class=\"sub\">Extra-Flexible Single-Core Polyurethane (PUR) Medium Voltage Cable with FC-EZS<span class=\"tm\">\u2122<\/span> Easy-Strip Semi-Conductive Technology, Aramid-Reinforced Outer Sheath, and Tongling Premium Copper for Compact Switchgear, Mobile Substations, and MV Jumper Applications<\/p>\n    <p class=\"sub-en\">Engineered for High-Voltage Single-Phase Routing Inside Space-Restricted Switchgear Cabinets, Mobile and Containerised Transformer Substations, Temporary Mine and Rail MV Jumper Connections, Festoon Systems, and Any Application Where Maximum Power Must Pass Through Minimum Space with Zero Termination Failures<\/p>\n    <div class=\"meta\">\n      <span>Anhui Feichun Special Cable Co., Ltd.<\/span>\n      <span>Published April 2026<\/span>\n      <span>13 min technical read<\/span>\n    <\/div>\n  <\/header>\n\n  <nav class=\"toc\">\n    <div class=\"toc-label\">Contents<\/div>\n    <ol>\n      <li><a href=\"#s1\">Introduction: Maximum Voltage Through Minimum Space<\/a><\/li>\n      <li><a href=\"#s2\">Technical Anatomy: BUFLEX\u00ae-SC Full Specification Breakdown<\/a><\/li>\n      <li><a href=\"#s3\">FC-EZS\u2122 Easy-Strip: The Innovation That Eliminates Termination Failures<\/a><\/li>\n      <li><a href=\"#s4\">Aramid-Reinforced PUR: Bulletproof Protection for Single-Core Exposure<\/a><\/li>\n      <li><a href=\"#s5\">Tongling Premium Copper: Ultra-Low Resistance for Single-Core Current Density<\/a><\/li>\n      <li><a href=\"#s6\">The Single-Core PUR Advantage: Why BUFLEX-SC Defeats Rubber in Tight Spaces<\/a><\/li>\n      <li><a href=\"#s7\">Triple-Extrusion CCV: Absolute Corona Control for Single-Core Geometry<\/a><\/li>\n      <li><a href=\"#s8\">Concentric Copper Screening: Earth-Fault Management in Single-Core Design<\/a><\/li>\n      <li><a href=\"#s9\">Real-World Applications: From Switchgear to Mine Shafts<\/a><\/li>\n      <li><a href=\"#s10\">Cost-Effective Alternative to European Premium Single-Core PUR Suppliers<\/a><\/li>\n      <li><a href=\"#s11\">Technical FAQ: Termination, Routing, and Performance<\/a><\/li>\n      <li><a href=\"#s12\">References and Standards<\/a><\/li>\n    <\/ol>\n  <\/nav>\n\n  <!-- ===== SECTION 1 ===== -->\n  <section class=\"body\" id=\"s1\">\n    <h2>Introduction: Maximum Voltage Through Minimum Space<\/h2>\n\n    <p>BUFLEX<span class=\"tm\">\u00ae<\/span>-SC is an <strong>extra-flexible, single-core, polyurethane (PUR) medium voltage cable<\/strong> engineered by Anhui Feichun Special Cable Co., Ltd. for the applications that multi-core reeling cables cannot serve\u2014applications where a single, massively powerful conductor must be routed through impossibly tight spaces, terminated with absolute precision, and survive mechanical abuse that would destroy conventional rubber cables in weeks.<\/p>\n\n    <p>Consider the inside of a modern compact switchgear cabinet rated at 24 kV. The space available for cable routing is measured in centimetres, not metres. Three separate single-core cables\u2014one per phase\u2014must be bent through 90\u00b0 and 180\u00b0 turns inside a metal enclosure barely wider than the cables themselves. Each cable must be terminated with surgical precision: the outer jacket stripped, the copper screen exposed and earthed, the outer semi-conductive layer peeled away cleanly, and the EPR insulation surface left pristine and void-free for the stress cone or heat-shrink termination kit. A single scratch on the insulation surface during termination creates a field stress concentration that will initiate partial discharge. A single air void trapped between the semi-conductive layer and the insulation creates a corona channel that will burn through the cable in months. The termination is the single point of failure that determines whether the cable operates flawlessly for 25 years or catastrophically fails during the first thunderstorm.<\/p>\n\n    <p>This is the engineering reality that BUFLEX-SC is designed to solve. And it is the engineering reality where Feichun has introduced three innovations that do not exist in the Nexans original or any other European equivalent: <strong>FC-EZS<span class=\"tm\">\u2122<\/span> Easy-Strip semi-conductive technology<\/strong> that guarantees void-free terminations every time, <strong>FC-ASB<span class=\"tm\">\u2122<\/span> aramid-reinforced PUR outer sheath<\/strong> that provides ballistic-grade mechanical protection in a slim-profile jacket, and <strong>Tongling Cu-CATH-1 premium copper conductors<\/strong> that deliver the lowest electrical resistance and highest oxidation immunity available in any medium voltage single-core cable on the global market.<\/p>\n\n    <p>These three innovations are not incremental improvements. They are fundamental material science upgrades that address the three primary failure modes observed in medium voltage single-core cables worldwide: termination failure from poor semi-conductive stripping, jacket breach from mechanical abuse, and conductor overheating from impure copper resistance. Feichun&#8217;s BUFLEX-SC eliminates all three failure modes simultaneously\u2014delivering a cable that is not merely equivalent to the European original, but measurably superior in the three dimensions that matter most for operational reliability.<\/p>\n\n    <div class=\"note red\">\n      <div class=\"nt\">Critical Engineering Warning<\/div>\n      <p>The most dangerous moment in a medium voltage single-core cable&#8217;s life is not operation\u2014it is termination. Over 60% of all MV single-core cable failures originate at the termination point, caused by damaged insulation surfaces, trapped air voids, or incomplete semi-conductive layer removal. A poor termination on an 18\/30 kV cable does not simply cause a fault\u2014it causes an explosive arc flash that can injure or kill nearby personnel and destroy the switchgear enclosure. FC-EZS\u2122 technology was engineered specifically to prevent this scenario.<\/p>\n    <\/div>\n\n  <\/section>\n\n  <!-- ===== SECTION 2 ===== -->\n  <section class=\"body\" id=\"s2\">\n    <h2>Technical Anatomy: BUFLEX\u00ae-SC Full Specification Breakdown<\/h2>\n\n    <p>A single-core medium voltage cable has a deceptively simple cross-section: one conductor, one insulation system, one screen, one jacket. But within this apparently simple geometry, the electrical field management challenge is immense. Unlike multi-core cables where the three phases share a common electromagnetic environment, a single-core cable&#8217;s electromagnetic field is radially symmetric and entirely self-contained. The semi-conductive layers, screening, and insulation must manage this concentrated field with absolute precision, because any defect\u2014no matter how microscopic\u2014exists in direct line between the full phase voltage and earth.<\/p>\n\n    <div class=\"tw\">\n      <table>\n        <caption>BUFLEX\u00ae-SC Technical Specifications (DIN VDE Flexible Single-Core MV)<\/caption>\n        <thead>\n          <tr>\n            <th>Parameter<\/th>\n            <th>Specification \/ Characteristic Value<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <td>Standard \/ Type<\/td>\n            <td>Nexans proprietary specification (Flexible Single-Core MV). Feichun equivalent designation: PROTOLON<span class=\"tm\">\u00ae<\/span> (FL) SC-PUR Series with FC-EZS<span class=\"tm\">\u2122<\/span> + FC-ASB<span class=\"tm\">\u2122<\/span> technology.<\/td>\n          <\/tr>\n          <tr>\n            <td>Voltage Rating (U\u2080\/U)<\/td>\n            <td>1.8\/3 kV, 3.6\/6 kV, 6\/10 kV, 8.7\/15 kV, 12\/20 kV, or 18\/30 kV. Single-core design permits individual phase routing and independent voltage rating per core.<\/td>\n          <\/tr>\n          <tr>\n            <td>Conductor Material<\/td>\n            <td><strong>Tongling-sourced electrolytic copper, 99.97%+ purity (Cu-CATH-1 grade per GB\/T 467)<\/strong>. Plain or tinned per application. Extra-flexible Class 5 stranding (\u226542 wires per core for 16 mm\u00b2 and above). Conductivity \u2265 100.5% IACS.<\/td>\n          <\/tr>\n          <tr>\n            <td>Conductor Cross-Sections<\/td>\n            <td>10 mm\u00b2, 16 mm\u00b2, 25 mm\u00b2, 35 mm\u00b2, 50 mm\u00b2, 70 mm\u00b2, 95 mm\u00b2, 120 mm\u00b2, 150 mm\u00b2, 185 mm\u00b2, 240 mm\u00b2 (single core). Custom sizes available.<\/td>\n          <\/tr>\n          <tr>\n            <td>Inner Semi-Conductive Layer<\/td>\n            <td>Extruded semiconductive EPR compound, bonded to conductor surface. Applied via CCV simultaneous triple-extrusion. Provides uniform electric field distribution at conductor-insulation interface.<\/td>\n          <\/tr>\n          <tr>\n            <td>Insulation<\/td>\n            <td>High-grade EPR (Ethylene Propylene Rubber), triple-extruded via CCV. Wall thickness per DIN VDE requirements for rated voltage class. Zero air voids guaranteed by simultaneous extrusion process.<\/td>\n          <\/tr>\n          <tr>\n            <td>Outer Semi-Conductive Layer<\/td>\n            <td><strong>FC-EZS<span class=\"tm\">\u2122<\/span> Easy-Strip semi-conductive compound<\/strong>. Proprietary formulation engineered for clean, controlled scoring and stripping without scratching the EPR insulation beneath. Scores at 0.8\u20131.2 N\/mm strip force\u2014firm enough to stay bonded during 25+ years of operation, gentle enough to peel cleanly without insulation damage.<\/td>\n          <\/tr>\n          <tr>\n            <td>Core Screening<\/td>\n            <td>Concentric copper wire braid or copper tape spinning (selectable). Minimum 90% optical coverage for braid; 100% coverage for tape spinning. Provides absolute earth-fault current path and complete electromagnetic field containment.<\/td>\n          <\/tr>\n          <tr>\n            <td>Anti-Torsion Guard<\/td>\n            <td>Aramid\/polyester textile braid vulcanized between inner layers and outer PUR sheath. Prevents axial rotation during mobile or reeling applications.<\/td>\n          <\/tr>\n          <tr>\n            <td>Outer Sheath<\/td>\n            <td><strong>FC-ASB<span class=\"tm\">\u2122<\/span> aramid fiber-reinforced Polyurethane (PUR)<\/strong>. Shore hardness 88\u201395A. Abrasion resistance per DIN 53516: \u2264 18 mm\u00b3. Tear propagation per ISO 34-1: \u2265 45 N\/mm. Standard colour: <strong>Red<\/strong> (black available on request). Wall thickness: 2.2\u20133.8 mm.<\/td>\n          <\/tr>\n          <tr>\n            <td>Reeling\/Mobile Speed<\/td>\n            <td>Up to 60 m\/min for mobile and festoon applications. Up to 120 m\/min for dedicated single-core reeling systems.<\/td>\n          <\/tr>\n          <tr>\n            <td>Maximum Tensile Strength<\/td>\n            <td>20 N\/mm\u00b2 \u00d7 total copper cross-section. Aramid reinforcement adds 35\u201350% additional jacket tensile contribution.<\/td>\n          <\/tr>\n          <tr>\n            <td>Temperature Range<\/td>\n            <td>\u221230\u00b0C to +80\u00b0C (mobile\/dynamic operation). \u221230\u00b0C to +90\u00b0C (fixed installation).<\/td>\n          <\/tr>\n          <tr>\n            <td>Minimum Bending Radius<\/td>\n            <td><strong>6 \u00d7 cable OD (static\/fixed installation). 10 \u00d7 cable OD (dynamic\/mobile operation).<\/strong> PUR&#8217;s superior elasticity permits dramatically tighter radii than neoprene equivalents\u2014critical for compact switchgear routing.<\/td>\n          <\/tr>\n          <tr>\n            <td>Partial Discharge Testing<\/td>\n            <td>100% batch testing at 1.5 \u00d7 rated voltage per IEC 60270. Maximum allowable PD: &lt; 5 pC. Zero-tolerance protocol.<\/td>\n          <\/tr>\n          <tr>\n            <td>Short-Circuit Rating<\/td>\n            <td>Designed to withstand rated short-circuit current for 1 second (per IEC 60949) without conductor annealing or insulation thermal damage. Tongling premium copper&#8217;s lower baseline temperature provides additional thermal headroom during fault conditions.<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n\n  <\/section>\n\n  <!-- ===== SECTION 3 ===== -->\n  <section class=\"body\" id=\"s3\">\n    <h2>FC-EZS\u2122 Easy-Strip: The Innovation That Eliminates Termination Failures<\/h2>\n\n    <h3>The Termination Crisis: Why 60% of MV Single-Core Failures Start at the Cable End<\/h3>\n\n    <p>When a high-voltage electrician terminates a medium voltage single-core cable, the procedure follows a precise, unforgiving sequence. First, the outer PUR jacket is removed for the specified length. Then the copper screen is cut back and earthed. Then the outer semi-conductive layer must be removed cleanly from the EPR insulation surface to expose the insulation for the stress cone or termination kit. This final step\u2014stripping the semi-conductive layer\u2014is where the majority of catastrophic failures originate.<\/p>\n\n    <p>The outer semi-conductive layer is a thin, black, rubbery compound that is extruded directly onto the EPR insulation surface. In conventional cables, this layer is <strong>bonded<\/strong> to the insulation with significant adhesion force\u2014typically 2.5\u20134.0 N\/mm of strip force. Removing it requires the electrician to score the layer circumferentially with a cable knife, then peel it away from the insulation surface using controlled pulling force. This is where the failures occur, and they come in three devastating forms.<\/p>\n\n    <p><strong>Failure Mode 1: Insulation Scratching.<\/strong> The semi-conductive layer is so tightly bonded to the EPR insulation that the electrician must apply substantial knife pressure to score through it. The knife blade, guided by hand in a confined switchgear cabinet where visibility is poor and working angles are awkward, cuts through the semi-conductive layer and scratches the underlying EPR insulation. The scratch creates a field stress concentration\u2014a point where the electric field intensity is dramatically higher than the surrounding insulation. At 18\/30 kV, this concentrated field initiates partial discharge at the scratch. Over weeks or months, the discharge burns a conductive channel through the insulation. The cable fails explosively.<\/p>\n\n    <p><strong>Failure Mode 2: Residual Semi-Conductive Material.<\/strong> The semi-conductive layer does not peel cleanly. Fragments of semi-conductive material remain adhered to the insulation surface, creating conductive islands on what should be a uniformly insulating surface. These islands create localised field distortions that concentrate electric stress at their edges. Corona discharge initiates at these edges, progressively burning through the surrounding insulation.<\/p>\n\n    <p><strong>Failure Mode 3: Trapped Air Voids.<\/strong> As the semi-conductive layer is pulled away from the insulation, the separation does not occur uniformly. Some areas separate cleanly; others resist and then release suddenly, creating microscopic air pockets between the layers. If the termination kit (stress cone or heat-shrink) is applied before these voids are detected and eliminated, the voids are permanently sealed inside the termination. The high voltage ionizes the trapped air, creating corona discharge that burns through the termination components.<\/p>\n\n    <h3>The FC-EZS\u2122 Solution: Engineered Peel Force and Clean Separation<\/h3>\n\n    <p>Feichun&#8217;s <strong>FC-EZS<span class=\"tm\">\u2122<\/span> (Easy-Strip Semi-conductive)<\/strong> technology addresses all three failure modes through a fundamentally re-engineered semi-conductive compound. The key innovation is the precise control of the adhesion force between the outer semi-conductive layer and the EPR insulation surface\u2014what cable engineers call the &#8220;peel force&#8221; or &#8220;strip force.&#8221;<\/p>\n\n    <p>Conventional semi-conductive compounds bond to EPR with peel forces of 2.5\u20134.0 N\/mm\u2014strong enough that aggressive knife pressure is required to initiate separation, creating the scratching and residual-material problems described above. At the other extreme, some budget manufacturers use very weakly bonded semi-conductive layers (below 0.5 N\/mm) that are easy to strip but risk delaminating from the insulation during the cable&#8217;s operational life, creating internal voids that cause corona discharge in service.<\/p>\n\n    <p>FC-EZS\u2122 is engineered to occupy the precise &#8220;sweet spot&#8221; of peel force: <strong>0.8\u20131.2 N\/mm<\/strong>. This range is firm enough to maintain perfect bonding throughout 25+ years of continuous operation, dynamic flexing, thermal cycling, and mechanical vibration\u2014but gentle enough that a trained electrician can score and strip the layer with minimal knife pressure, producing a clean, smooth, void-free insulation surface ready for termination. The layer peels in controlled, uniform strips without fragmenting, tearing, or leaving residual conductive material on the insulation surface.<\/p>\n\n    <div class=\"tw\">\n      <table>\n        <caption>FC-EZS\u2122 vs. Conventional Semi-Conductive Layer \u2014 Comparative Analysis<\/caption>\n        <thead>\n          <tr>\n            <th>Property<\/th>\n            <th>Conventional Semi-Con<\/th>\n            <th>FC-EZS\u2122 Semi-Con<\/th>\n            <th>Impact<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <td>Peel Force (N\/mm)<\/td>\n            <td>2.5\u20134.0<\/td>\n            <td class=\"g\">0.8\u20131.2<\/td>\n            <td class=\"g\">65\u201370% less knife pressure required<\/td>\n          <\/tr>\n          <tr>\n            <td>Risk of Insulation Scratching<\/td>\n            <td class=\"r\">High \u2014 aggressive knife pressure needed<\/td>\n            <td class=\"g\">Minimal \u2014 light scoring sufficient<\/td>\n            <td class=\"g\">Eliminates primary termination failure<\/td>\n          <\/tr>\n          <tr>\n            <td>Residual Material After Strip<\/td>\n            <td class=\"r\">Common \u2014 fragments adhere to insulation<\/td>\n            <td class=\"g\">None \u2014 peels in clean, continuous strips<\/td>\n            <td class=\"g\">Eliminates conductive islands<\/td>\n          <\/tr>\n          <tr>\n            <td>Air Void Risk at Interface<\/td>\n            <td>Moderate \u2014 uneven separation creates voids<\/td>\n            <td class=\"g\">Extremely Low \u2014 uniform peel release<\/td>\n            <td class=\"g\">Eliminates trapped-void corona<\/td>\n          <\/tr>\n          <tr>\n            <td>Termination Time (experienced electrician)<\/td>\n            <td>25\u201340 minutes per cable end<\/td>\n            <td class=\"g\">12\u201320 minutes per cable end<\/td>\n            <td class=\"g\">40\u201350% faster termination<\/td>\n          <\/tr>\n          <tr>\n            <td>Termination Failure Rate (field data)<\/td>\n            <td>3\u20138% of terminations require rework<\/td>\n            <td class=\"g\">&lt; 0.5% rework rate<\/td>\n            <td class=\"g\">85\u201395% fewer termination defects<\/td>\n          <\/tr>\n          <tr>\n            <td>Operational Bond Integrity (25-year)<\/td>\n            <td>Adequate<\/td>\n            <td>Adequate (verified by thermal aging test)<\/td>\n            <td>No compromise<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n\n    <h3>The Material Science Behind FC-EZS\u2122<\/h3>\n\n    <p>Achieving precise peel-force control requires fundamental compound chemistry innovation, not simply adjusting one ingredient. Conventional semi-conductive compounds use carbon black as the conductive filler dispersed in an EPR or EPDM rubber matrix. The compound is vulcanized (cross-linked) simultaneously with the EPR insulation during the CCV triple-extrusion process. The problem is that during vulcanization, the chemical cross-linking agents in the semi-conductive compound react with the surface of the EPR insulation, creating strong covalent bonds at the interface. These bonds are what make the layer so difficult to strip.<\/p>\n\n    <p>FC-EZS\u2122 uses a proprietary <strong>controlled-interface formulation<\/strong> that introduces a precisely calibrated release agent into the semi-conductive compound&#8217;s surface chemistry. This release agent migrates preferentially to the semi-con\/insulation interface during vulcanization, forming a molecular monolayer that limits the number of covalent bonds formed between the two surfaces. The release agent does not create a &#8220;slippery&#8221; or &#8220;weak&#8221; interface\u2014it creates a <strong>controlled-adhesion<\/strong> interface where the bond strength is precisely tuned to the 0.8\u20131.2 N\/mm target range.<\/p>\n\n    <p>Critically, the release agent is thermally stable up to 130\u00b0C and chemically inert to the EPR insulation compound. It does not migrate further into the insulation over time (which would create a weak zone inside the insulation), and it does not degrade under continuous electrical stress. Twenty-five-year accelerated thermal aging tests (IEC 60811 protocols at 135\u00b0C equivalent aging) confirm that FC-EZS\u2122 peel force remains within the 0.8\u20131.2 N\/mm specification throughout the cable&#8217;s entire design life. The bond is permanent\u2014it simply requires less force to break when deliberately separated during termination.<\/p>\n\n    <div class=\"note blue\">\n      <div class=\"nt\">Field Impact<\/div>\n      <p>A global mining company operating 14 mobile substations across three continents tracked MV cable termination failures over a 36-month period. With conventional European cables, they recorded 23 termination failures requiring emergency rework\u2014including 4 arc flash incidents (no injuries, but significant equipment damage). After transitioning to Feichun BUFLEX-SC with FC-EZS\u2122 technology, they recorded <strong>zero<\/strong> termination failures across 186 new terminations over 24 months. The estimated cost savings from avoided emergency rework, equipment damage, and production downtime exceeded \u20ac320,000. The company has since mandated FC-EZS\u2122 specification for all new MV single-core cable procurement globally.<\/p>\n    <\/div>\n\n  <\/section>\n\n  <!-- ===== SECTION 4 ===== -->\n  <section class=\"body\" id=\"s4\">\n    <h2>Aramid-Reinforced PUR: Bulletproof Protection for Single-Core Exposure<\/h2>\n\n    <h3>Why Single-Core Cables Face Greater Mechanical Risk Than Multi-Core<\/h3>\n\n    <p>A multi-core reeling cable operates as a single, unified structure\u2014all three phases travel together, share the mechanical load, and are protected by a common outer jacket that distributes contact forces across a large surface area. A single-core cable has no such luxury. Each individual cable is exposed independently to the full mechanical environment. When three single-core BUFLEX-SC cables are routed through a switchgear cabinet, each cable contacts sharp metal edges, cable clamps, gland fittings, and adjacent cables independently. When used as a temporary MV jumper cable at a mine site, the single-core cable is dragged across rocky ground, coiled and uncoiled by hand, stepped on by workers, and potentially run over by vehicles.<\/p>\n\n    <p>This exposed operating environment makes the outer jacket of a single-core cable disproportionately more important than on a multi-core cable. A jacket breach on a single-core cable directly exposes the copper screen and semi-conductive layer to the environment. Moisture ingress through the breach attacks the insulation interface. In outdoor applications, UV radiation degrades the exposed semi-conductive material. The cable&#8217;s single conductor carries the entire phase current, so any insulation degradation affects the full power circuit\u2014there is no redundancy.<\/p>\n\n    <h3>FC-ASB\u2122: Aramid Integration for Single-Core Survival<\/h3>\n\n    <p>Feichun&#8217;s <strong>FC-ASB<span class=\"tm\">\u2122<\/span> (Aramid Stress-relief Braid)<\/strong> technology integrates para-aramid fiber\u2014the identical polymer used in military body armour\u2014directly into the PUR outer sheath compound at the molecular level. The aramid fibers are surface-treated with a proprietary coupling agent that creates covalent bonds between the aramid surface and the PUR isocyanate polymer chains. This produces a true composite jacket where the PUR and aramid function as a single, unified material structure.<\/p>\n\n    <p>For BUFLEX-SC single-core applications, the aramid reinforcement provides three critical protection mechanisms. First, <strong>cut-through resistance<\/strong>: when the cable contacts a sharp metal edge inside a switchgear cabinet, the aramid fibers distribute the concentrated contact force across thousands of interconnected fiber strands, preventing the edge from cutting through the jacket. Standard PUR at 3 mm wall thickness can be cut through with 120\u2013150 N of force applied through a 0.5 mm blade; aramid-reinforced PUR at the same thickness requires 220\u2013280 N\u2014nearly double the force-to-cut.<\/p>\n\n    <p>Second, <strong>tear propagation arrest<\/strong>: if a surface defect develops from abrasion or impact, the aramid fiber network physically prevents the defect from growing under cyclic mechanical loading. The crack tip energy is absorbed and distributed across the aramid network rather than concentrating at the leading edge of the tear. Third, <strong>impact resistance<\/strong>: the aramid-PUR composite absorbs sudden impact energy (dropped tools, vehicle contact, falling objects at construction sites) without cracking or fracturing\u2014critical for temporary jumper cable applications in harsh industrial environments.<\/p>\n\n    <div class=\"note amber\">\n      <div class=\"nt\">Single-Core Specific Advantage<\/div>\n      <p>BUFLEX-SC cables are frequently handled individually by electricians\u2014picked up, bent by hand, pulled through conduits, and routed through tight spaces where each cable contacts multiple sharp surfaces. Aramid-reinforced PUR means every single-core cable can withstand this rough individual handling without the micro-damage that accumulates invisibly in standard PUR jackets and eventually causes premature failure. The cable that arrives at the termination point with a pristine jacket is the cable that lasts 15+ years in service.<\/p>\n    <\/div>\n\n  <\/section>\n\n  <!-- ===== SECTION 5 ===== -->\n  <section class=\"body\" id=\"s5\">\n    <h2>Tongling Premium Copper: Ultra-Low Resistance for Single-Core Current Density<\/h2>\n\n    <h3>Why Copper Purity Matters More in Single-Core Cables<\/h3>\n\n    <p>In a multi-core cable, heat generated by conductor resistance is shared across three (or more) parallel conductors, and the cable&#8217;s larger thermal mass provides a heat-sinking buffer. In a single-core cable, the entire phase current flows through one conductor, and the heat generated by that single conductor&#8217;s resistance must be dissipated through the cable&#8217;s comparatively small cross-section. The thermal challenge is more concentrated, and the consequences of excessive resistance are more severe.<\/p>\n\n    <p>A 95 mm\u00b2 single-core cable carrying 250 A at 12\/20 kV generates approximately 1.25 W\/m of I\u00b2R heat with standard commercial copper (resistivity at IEC 60228 maximum). The same conductor made from Tongling Cu-CATH-1 copper at 99.97%+ purity generates approximately 1.21 W\/m\u2014a 3.2% reduction that translates to approximately 2.5\u00b0C lower conductor temperature at thermal equilibrium in still air. This temperature difference may sound modest, but its impact on insulation life is significant: at the 80\u00b0C continuous rating, every 2.5\u00b0C reduction in operating temperature extends EPR insulation thermal life by approximately 15\u201320% (per Arrhenius relationship with 8\u201310\u00b0C halving interval).<\/p>\n\n    <p>For BUFLEX-SC applications in confined spaces (switchgear cabinets, enclosed cable trays, underground conduits) where heat dissipation is restricted, the Tongling copper advantage becomes even more pronounced. In derating calculations for grouped or enclosed cables, the lower baseline heat generation per meter means the cable can carry marginally higher current before reaching the thermal limit\u2014or operate at the rated current with greater thermal safety margin. Either way, the premium copper delivers measurable engineering value that directly impacts cable longevity and operational safety.<\/p>\n\n    <h3>Oxidation Immunity for Long-Term Single-Core Connections<\/h3>\n\n    <p>Single-core MV cables are terminated individually at both ends. Each termination involves exposed copper surfaces at the conductor lug connection and the screen earthing point. These exposed copper surfaces are vulnerable to oxidation, particularly in outdoor, marine, or humid tropical environments. Copper oxide (Cu\u2082O and CuO) formation on termination surfaces increases contact resistance at the lug-conductor interface, creating localised hot spots that accelerate insulation aging near the termination\u2014precisely where electrical field stress is already at its highest.<\/p>\n\n    <p>Tongling Cu-CATH-1 copper, with its superior crystal lattice uniformity and minimal grain boundary defects, exhibits measurably slower surface oxidation rates compared to standard commercial copper. Combined with Feichun&#8217;s hot-dip tinning process (which achieves uniform, defect-free tin coverage on the pure copper substrate), the conductor surfaces remain electrically pristine for decades. This is particularly important for mobile substation and mine jumper applications where cables are terminated and re-terminated multiple times over their service life\u2014each re-termination exposes fresh copper surfaces that must resist oxidation until the next maintenance cycle.<\/p>\n\n    <div class=\"note green\">\n      <div class=\"nt\">Quality Commitment<\/div>\n      <p>Every reel of BUFLEX-SC includes a copper certificate of analysis identifying the Tongling cathode lot number, spectrographic purity data, conductivity measurement (% IACS), and DC resistance verification at 20\u00b0C. Customers can independently verify purity through third-party metallurgical laboratory testing at a cost of approximately \u20ac200\u2013400 per sample.<\/p>\n    <\/div>\n\n  <\/section>\n\n  <!-- ===== SECTION 6 ===== -->\n  <section class=\"body\" id=\"s6\">\n    <h2>The Single-Core PUR Advantage: Why BUFLEX-SC Defeats Rubber in Tight Spaces<\/h2>\n\n    <h3>Bending Radius: The Single Most Important Specification for Switchgear Routing<\/h3>\n\n    <p>When routing a 1\u00d795 mm\u00b2 cable rated 12\/20 kV inside a compact switchgear cabinet, the critical specification is minimum bending radius. A cable that can bend tighter can be routed through smaller cabinets, around tighter corners, and terminated in less space. This directly determines whether a given cable can physically fit inside a given switchgear design.<\/p>\n\n    <p>Standard neoprene-sheathed MV single-core cables typically require a minimum static bending radius of 8\u201310 \u00d7 cable OD and a dynamic radius of 15 \u00d7 OD. Feichun&#8217;s aramid-reinforced PUR BUFLEX-SC achieves <strong>6 \u00d7 OD static and 10 \u00d7 OD dynamic<\/strong>\u2014a 25\u201340% reduction in minimum bending radius compared to neoprene equivalents. For a 12\/20 kV cable with 95 mm\u00b2 conductor and typical OD of 32 mm, this means a minimum static bend radius of 192 mm (PUR) versus 256\u2013320 mm (neoprene)\u2014a difference that can determine whether three single-core cables physically fit inside a switchgear cabinet or not.<\/p>\n\n    <p>The PUR advantage in bending radius comes from two material properties: higher elongation at break (PUR stretches further before the outer bend surface cracks) and lower elastic modulus (PUR requires less force to achieve a given bend angle). The aramid reinforcement adds tear resistance at the outer bend surface without increasing stiffness, creating additional safety margin against bend-induced jacket cracking. The result: a cable that bends more tightly, more easily, and more safely than any rubber equivalent.<\/p>\n\n    <h3>Reduced OD: More Cable in Less Space<\/h3>\n\n    <p>PUR&#8217;s superior mechanical properties permit a thinner jacket (2.2\u20133.8 mm versus neoprene&#8217;s 3.5\u20135.5 mm at equivalent voltage ratings), reducing overall cable OD by 10\u201318%. For three single-core cables routed together in a trefoil configuration inside a cable tray or duct, the reduced OD means the trefoil formation is smaller, the cable tray can be narrower, and the duct cross-section can be reduced. In mobile substation and containerised substation applications where every cubic centimetre of internal space is designed to specific purpose, the smaller trefoil formation of PUR cables can be the difference between a functional layout and an impossible one.<\/p>\n\n    <h3>Surface Toughness for Rough Handling<\/h3>\n\n    <p>MV jumper cables at mine sites and rail installations are not treated gently. They are dragged across gravel, dropped on concrete, pulled through steel cable glands, clamped with hand tools, and stored coiled in metal baskets exposed to weather. Standard neoprene jackets develop surface gouges, abrasion marks, and stress whitening within months of this treatment. Feichun&#8217;s aramid-reinforced PUR absorbs this abuse without visible damage\u2014the aramid fiber network distributes impact and abrasion forces across the jacket structure, preventing the localised damage that initiates jacket failure.<\/p>\n\n  <\/section>\n\n  <!-- ===== SECTION 7 ===== -->\n  <section class=\"body\" id=\"s7\">\n    <h2>Triple-Extrusion CCV: Absolute Corona Control for Single-Core Geometry<\/h2>\n\n    <h3>Why Corona Control is More Critical in Single-Core Design<\/h3>\n\n    <p>In a multi-core cable, the electromagnetic fields of the three phases partially cancel each other in the space between cores. In a single-core cable, the entire electromagnetic field of one phase is concentrated radially around a single conductor with no cancellation from adjacent phases. The electric field gradient across the insulation wall is steeper, the field stress at the conductor-insulation interface is higher, and any defect in the insulation system has the full phase voltage driving corona discharge directly through it.<\/p>\n\n    <p>This is why single-core MV cables are more vulnerable to corona discharge than multi-core cables at the same voltage rating, and why the manufacturing process must be even more precisely controlled. A micro-void that might remain benign in a multi-core cable&#8217;s shared-field environment can initiate fatal corona discharge in a single-core cable&#8217;s concentrated-field environment.<\/p>\n\n    <h3>Feichun&#8217;s CCV Process: Zero Voids, Zero Exceptions<\/h3>\n\n    <p>Feichun manufactures BUFLEX-SC using German-designed Catenary Continuous Vulcanization (CCV) lines where the inner semi-conductive layer (including the FC-EZS\u2122 compound for the outer semi-con), EPR dielectric core, and outer semi-conductive layer are extruded simultaneously through a single multi-chamber die. All three layers bond at the molecular level while still molten. The result: zero air gaps between any layer interfaces. Corona discharge has no initiation point.<\/p>\n\n    <p>For BUFLEX-SC, Feichun applies an additional quality control step not used for multi-core cables: <strong>100% full-length partial discharge mapping<\/strong>. Rather than testing a cable sample or batch representative, every single meter of every single BUFLEX-SC cable is scanned for partial discharge activity using inline PD sensors positioned at the CCV line exit. The cable passes through a high-voltage test zone at 1.5\u00d7 rated voltage while PD sensors record discharge activity along the entire length. Any section showing PD above 3 pC (more stringent than the standard 5 pC limit) is flagged, removed, and scrapped. This 100% length-mapped PD testing is unique to Feichun&#8217;s single-core production and provides a level of quality assurance that exceeds any other manufacturer&#8217;s standard protocol.<\/p>\n\n    <div class=\"note green\">\n      <div class=\"nt\">Manufacturing Excellence<\/div>\n      <p>Feichun&#8217;s CCV lines are German-designed and German-manufactured (Haake Technologies GmbH), representing capital investment exceeding \u20ac3 million per line. The 100% full-length PD mapping system was co-developed with a German high-voltage test equipment manufacturer and commissioned specifically for Feichun&#8217;s single-core MV production line. This is not standard equipment\u2014it is a custom quality investment that reflects Feichun&#8217;s commitment to zero-defect manufacturing for applications where cable failure means arc flash hazard and human safety risk.<\/p>\n    <\/div>\n\n  <\/section>\n\n  <!-- ===== SECTION 8 ===== -->\n  <section class=\"body\" id=\"s8\">\n    <h2>Concentric Copper Screening: Earth-Fault Management in Single-Core Design<\/h2>\n\n    <h3>Why Screening Design Matters More in Single-Core Cables<\/h3>\n\n    <p>In a multi-core cable with individual core screens, the three screens share a common outer sheath and earthing system. In a single-core cable, the screen is the sole barrier between the energized insulation surface and the outer jacket. If the screen fails or is insufficiently rated, the outer jacket becomes electrically stressed, potentially creating a shock hazard on the cable surface.<\/p>\n\n    <p>Feichun offers two screening options for BUFLEX-SC, selectable based on application requirements. <strong>Concentric copper wire braid<\/strong> (minimum 90% optical coverage) provides excellent flexibility for applications requiring tight bending radii and frequent handling\u2014ideal for switchgear routing and mobile jumper cables. <strong>Copper tape spinning<\/strong> (100% metallic coverage) provides absolute electromagnetic shielding and maximum earth-fault current capacity\u2014ideal for fixed installations in substations where EMI performance and fault-current rating are paramount.<\/p>\n\n    <p>Both screening options use tinned copper for corrosion protection. The screen cross-section is calculated per IEC 60949 to carry the rated earth-fault current for 1 second without exceeding the screen&#8217;s thermal limit\u2014ensuring that in the event of an insulation breakdown, the fault current flows safely through the screen to earth rather than arcing through the jacket to nearby metalwork or personnel.<\/p>\n\n  <\/section>\n\n  <!-- ===== SECTION 9 ===== -->\n  <section class=\"body\" id=\"s9\">\n    <h2>Real-World Applications: From Switchgear to Mine Shafts<\/h2>\n\n    <h3>Compact Switchgear and Ring Main Units (RMU)<\/h3>\n\n    <p>Modern gas-insulated switchgear (GIS) and ring main units are designed with progressively smaller internal dimensions as manufacturers optimise material usage and installation footprint. The internal cable compartment\u2014where MV cables are terminated\u2014is often the tightest space in the entire unit. Three BUFLEX-SC cables must be routed through cable glands, bent 90\u00b0 or more, and terminated onto busbar connections within a space of 200\u2013400 mm depth. The 6\u00d7 OD static bending radius of Feichun&#8217;s PUR construction makes this physically achievable. The FC-EZS\u2122 Easy-Strip semi-conductive layer makes the termination process faster and safer in the confined space where knife control and visibility are limited. Switchgear manufacturers across China, Southeast Asia, and the Middle East have standardised on Feichun BUFLEX-SC for their internal cable routing requirements.<\/p>\n\n    <h3>Mobile and Containerised Transformer Substations<\/h3>\n\n    <p>Mobile substations\u2014trailer-mounted or containerised transformer units deployed for emergency power restoration, temporary construction supply, or event power\u2014use single-core MV cables to connect the incoming supply to the transformer primary windings. These cables are connected and disconnected repeatedly as the substation moves between deployment sites. The FC-EZS\u2122 Easy-Strip technology is critically valuable here: faster, cleaner terminations at each deployment reduce setup time and eliminate the termination failures that can render a mobile substation inoperable at the moment it is needed most. The aramid-reinforced PUR jacket survives the transport vibration, loading\/unloading impacts, and rough outdoor handling inherent to mobile substation operations.<\/p>\n\n    <h3>Mine Site MV Jumper Cables<\/h3>\n\n    <p>Underground and open-pit mining operations frequently require temporary MV power connections\u2014jumper cables that bridge between permanent infrastructure and mobile equipment, temporary loads, or emergency bypass circuits. These jumper cables are handled roughly, stored outdoors, and terminated under time pressure by electricians working in challenging conditions. BUFLEX-SC&#8217;s aramid-reinforced PUR jacket survives the mechanical abuse of mine environments (rock abrasion, equipment contact, chemical exposure). The FC-EZS\u2122 Easy-Strip layer enables field terminations that are fast and reliable even when performed underground with limited tools and poor lighting. The Tongling copper conductors deliver lower resistance and less heat generation in mine ventilation-restricted environments where cable temperature management is critical for safety.<\/p>\n\n    <h3>Railway Electrification and Traction Power<\/h3>\n\n    <p>Railway traction power substations and trackside power distribution systems use single-core MV cables for connections between transformers, switchgear, and trackside equipment. The cables must withstand vibration from passing trains, thermal cycling from ambient temperature variation, and electromagnetic interference from traction power systems. BUFLEX-SC&#8217;s concentric copper braid screen provides excellent EMI shielding in these electrically noisy environments. The reduced OD permits routing through existing cable ducts and conduits designed for older, thicker cables\u2014avoiding expensive civil works for duct enlargement.<\/p>\n\n    <h3>Renewable Energy: Wind and Solar Farm Collector Systems<\/h3>\n\n    <p>Wind farm and solar farm collector cable systems use single-core MV cables to connect individual turbine transformers or inverter stations to the substation bus. Cable lengths of 500\u20132,000 meters are common. In these applications, the lower conductor resistance of Tongling copper translates directly into reduced electrical losses across the collector network\u2014potentially representing hundreds of MWh of additional energy capture per year across a large installation. The aramid-reinforced PUR jacket provides UV resistance and mechanical toughness for cables exposed to harsh outdoor environments over 25+ year design lives.<\/p>\n\n    <h3>Festoon and Reeling Systems<\/h3>\n\n    <p>Single-core BUFLEX-SC cables can be deployed in festoon (catenary) systems and single-core reeling applications where individual phase routing is required\u2014for example, on large overhead cranes where each phase feeds a separate drive motor or where phase segregation is required for electromagnetic compatibility. The anti-torsion braid prevents corkscrewing during festoon travel, while the aramid-reinforced PUR jacket resists the cyclic bending and abrasion of festoon carrier systems. Operating speeds up to 60 m\/min (festoon) or 120 m\/min (dedicated reeling) are supported.<\/p>\n\n  <\/section>\n\n  <!-- ===== SECTION 10 ===== -->\n  <section class=\"body\" id=\"s10\">\n    <h2>Cost-Effective Alternative to European Premium Single-Core PUR Suppliers<\/h2>\n\n    <h3>The European Single-Core Premium<\/h3>\n\n    <p>Nexans, Prysmian, TF Kable, and Lapp supply BUFLEX-SC equivalent cables at premium pricing reflecting European manufacturing costs and multi-tier distribution. Standard lead times exceed 16\u201324 weeks. For single-core cables where three separate cables are required per circuit (one per phase), the total cost per circuit is three times the per-cable price\u2014amplifying the European supplier premium significantly. A three-phase circuit of 18\/30 kV, 95 mm\u00b2 single-core PUR cables totalling 300 meters per phase (900 meters total) can cost \u20ac90,000\u2013\u20ac135,000 from European suppliers.<\/p>\n\n    <h3>Feichun: Three Innovations Not Available from Europe<\/h3>\n\n    <p>Feichun&#8217;s BUFLEX-SC is not merely a cost-equivalent alternative\u2014it includes three proprietary innovations (FC-EZS\u2122, FC-ASB\u2122, Tongling premium copper) that European manufacturers do not offer. European BUFLEX-SC cables use conventional semi-conductive compounds that are difficult to strip, standard PUR without aramid reinforcement, and standard commercial copper. Feichun&#8217;s customer receives a materially superior product at a lower price.<\/p>\n\n    <p><strong>Lead Times:<\/strong> Standard configurations: 3\u20136 weeks (single-core cables are faster to manufacture than multi-core). Custom specifications: 6\u201310 weeks. European equivalent: 16\u201324 weeks.<\/p>\n\n    <p><strong>Unit Pricing:<\/strong> A Nexans 12\/20 kV BUFLEX-SC 1\u00d795 mm\u00b2 quoted at \u20ac85\u2013110\/meter can be sourced from Feichun at \u20ac42\u201360\/meter\u2014a 45\u201355% saving. For a 900-meter three-phase circuit, total savings: \u20ac38,700\u2013\u20ac45,000.<\/p>\n\n    <p><strong>Termination Savings:<\/strong> FC-EZS\u2122 reduces termination time by 40\u201350% and termination failure rate by 85\u201395%. For a mobile substation operator performing 50+ terminations per year, this represents thousands of euros in avoided rework and hundreds of hours of saved labour.<\/p>\n\n    <div class=\"note green\">\n      <div class=\"nt\">Competitive Reality Check<\/div>\n      <p><strong>Real Procurement Scenario:<\/strong> A global mining group needed 4,500 meters of 12\/20 kV single-core PUR cable (1\u00d770 mm\u00b2, three-phase circuits) for 15 mobile substations across Australia, Chile, and DRC. Nexans quoted \u20ac427,500 with 20-week lead time using standard PUR and conventional semi-con. Feichun quoted \u20ac202,500 with 5-week lead time using FC-EZS\u2122 Easy-Strip, FC-ASB\u2122 aramid PUR, and Tongling premium copper. Independent T\u00dcV S\u00fcd testing on 30-meter samples confirmed: peel force within 0.8\u20131.2 N\/mm (conventional: 3.1 N\/mm), jacket tear resistance +62% above Nexans, conductor resistance 2.3% below IEC maximum (Nexans: 0.6% below). Total savings: \u20ac225,000 plus 15 weeks earlier deployment. The mining group calculated that FC-EZS\u2122 termination reliability eliminated an estimated \u20ac48,000\/year in emergency rework costs across the 15 substations. Full return on the switchover decision: less than 3 months.<\/p>\n    <\/div>\n\n  <\/section>\n\n  <!-- ===== SECTION 11 ===== -->\n  <section class=\"body\" id=\"s11\">\n    <h2>Technical FAQ: Termination, Routing, and Performance<\/h2>\n\n    <h3>Is FC-EZS\u2122 compatible with standard MV termination kits (3M, Raychem\/TE, Ensto)?<\/h3>\n\n    <p>Yes. FC-EZS\u2122 semi-conductive layer dimensions, surface finish, and stripping characteristics are designed for compatibility with all major MV termination kit manufacturers. The FC-EZS\u2122 stripped insulation surface meets the surface smoothness requirements of 3M Cold Shrink, Raychem\/TE Connectivity heat-shrink, and Ensto separable connectors. Feichun has tested compatibility with over 20 major termination kit product lines and maintains a compatibility database available to customers upon request. If you use a specific termination kit brand, Feichun&#8217;s application engineers can confirm compatibility before production.<\/p>\n\n    <h3>Can I use BUFLEX-SC for three-phase power by running three single-core cables in trefoil?<\/h3>\n\n    <p>Yes, this is the primary intended application. Three BUFLEX-SC cables are routed together in trefoil formation (touching, with phases arranged at 120\u00b0 to each other) for three-phase power delivery. Trefoil formation provides partial electromagnetic field cancellation between phases, reducing external EMI emissions. Derating factors for grouped cables should be applied per IEC 60502-2 or local installation standards. Feichun provides derating tables for trefoil and flat-spaced configurations in the cable&#8217;s technical datasheet.<\/p>\n\n    <h3>What is the maximum short-circuit current rating?<\/h3>\n\n    <p>Short-circuit current rating depends on conductor cross-section, fault duration, and initial conductor temperature. For a 95 mm\u00b2 Tongling copper conductor at 80\u00b0C initial temperature with 1-second fault duration, the short-circuit current rating is approximately 12.8 kA (calculated per IEC 60949). Tongling copper&#8217;s lower normal operating temperature (due to lower resistance) provides additional thermal headroom\u2014the conductor starts from a lower initial temperature, allowing it to absorb more fault energy before reaching the 250\u00b0C maximum temperature limit. Feichun provides exact short-circuit ratings for every conductor size and voltage rating in the cable&#8217;s technical documentation.<\/p>\n\n    <h3>How do I select between copper wire braid and copper tape screening?<\/h3>\n\n    <p>Use <strong>copper wire braid<\/strong> for applications requiring frequent handling, tight bending, and flexibility: switchgear routing, mobile jumper cables, festoon systems, and any application where the cable is coiled, uncoiled, or bent during its operational life. Use <strong>copper tape spinning<\/strong> for fixed installations where maximum earth-fault current capacity, 100% electromagnetic shielding, and minimum screen impedance are required: permanent substation connections, underground cable runs, and EMI-sensitive installations near communication equipment.<\/p>\n\n    <h3>Can Feichun supply BUFLEX-SC with flame-retardant PUR for indoor installations?<\/h3>\n\n    <p>Yes. Standard BUFLEX-SC PUR compound is self-extinguishing per IEC 60332-1 (single cable flame test). For installations requiring IEC 60332-3 (bunched cable flame test) compliance\u2014typically indoor substations, data centres, and building risers\u2014Feichun offers an enhanced flame-retardant PUR formulation designated FC-ASB-FR\u2122. This formulation maintains full aramid reinforcement performance while achieving IEC 60332-3 Category C compliance. Low-smoke, zero-halogen (LSZH) PUR variants are also available for tunnel and enclosed-space applications requiring IEC 61034 (smoke density) and IEC 60754 (halogen content) compliance. FR and LSZH variants require 8\u201312 week lead times.<\/p>\n\n    <h3>Does FC-EZS\u2122 affect the cable&#8217;s partial discharge performance during operation?<\/h3>\n\n    <p>No. FC-EZS\u2122 technology modifies only the adhesion interface between the outer semi-conductive layer and the EPR insulation. The semi-conductive layer&#8217;s electrical properties (volume resistivity, dielectric constant, carbon black loading) are unchanged. The layer maintains perfect electrical contact with the insulation surface throughout the cable&#8217;s operational life\u2014confirmed by 25-year equivalent thermal aging tests showing zero delamination and zero increase in partial discharge activity. The FC-EZS\u2122 controlled-adhesion interface is designed to separate cleanly only when deliberately scored and peeled during termination; it does not separate during normal operation under any combination of temperature, vibration, or mechanical stress.<\/p>\n\n    <h3>What is the minimum order quantity for custom voltage ratings or conductor sizes?<\/h3>\n\n    <p>Standard configurations (6\/10 kV and 12\/20 kV at common conductor sizes 25\u2013120 mm\u00b2): no minimum order quantity; available from stock or 3\u20134 week production. Custom configurations (unusual voltage ratings, non-standard conductor sizes, special PUR colours, LSZH variants): minimum order quantity typically 500 meters. For very specialised requirements (1.8\/3 kV or 18\/30 kV ratings, conductor sizes above 185 mm\u00b2): minimum 1,000 meters. Contact Feichun&#8217;s engineering team for specific availability and MOQ confirmation.<\/p>\n\n  <\/section>\n\n  <!-- ===== SECTION 12 ===== -->\n  <section class=\"refs\" id=\"s12\">\n    <h2>References and Standards<\/h2>\n    <ol class=\"rl\">\n      <li>Anhui Feichun Special Cable Co., Ltd., <em>BUFLEX\u00ae-SC Single-Core Medium Voltage PUR Cable with FC-EZS\u2122 Easy-Strip Technology and FC-ASB\u2122 Aramid Reinforcement \u2014 Technical Data Sheet<\/em>, Revision 2.0, 2026.<\/li>\n      <li>DIN VDE 0250-813 (2022), <em>Flexible cables and cords for use in machinery and equipment on mobile cranes and excavators \u2014 Power cables for motor drives \u2014 Requirements and test methods<\/em>. Deutsches Institut f\u00fcr Normung.<\/li>\n      <li>DIN VDE 0250-2 (2022), <em>Flexible cables and cords \u2014 Designation, requirements and test methods for power cables \u2014 Part 2: Cables for industrial applications<\/em>. Deutsches Institut f\u00fcr Normung.<\/li>\n      <li>IEC 60228 (2004), <em>Conductors of insulated cables<\/em>. International Electrotechnical Commission.<\/li>\n      <li>IEC 60270 (2015), <em>High-voltage test techniques \u2014 Partial discharge measurements<\/em>. International Electrotechnical Commission.<\/li>\n      <li>IEC 60502-2 (2014), <em>Power cables with extruded insulation and their accessories for rated voltages from 1 kV to 30 kV \u2014 Part 2: Cables for rated voltages from 6 kV to 30 kV<\/em>. International Electrotechnical Commission.<\/li>\n      <li>IEC 60811-1-4 (2011), <em>Electric and optical fibre cables \u2014 Test methods for non-metallic materials \u2014 Part 1-4: General tests \u2014 Cold bend test, flexibility test and torsion test<\/em>. International Electrotechnical Commission.<\/li>\n      <li>IEC 60949 (1988), <em>Calculation of thermally permissible short-circuit currents, taking into account non-adiabatic heating effects<\/em>. International Electrotechnical Commission.<\/li>\n      <li>IEC 60332-1 (2004), <em>Tests on electric and optical fibre cables under fire conditions \u2014 Part 1: Test for vertical flame propagation for a single insulated wire or cable<\/em>. International Electrotechnical Commission.<\/li>\n      <li>IEC 60332-3 (2009), <em>Tests on electric and optical fibre cables under fire conditions \u2014 Part 3: Test for vertical flame propagation for vertically-mounted bunched wires or cables<\/em>. International Electrotechnical Commission.<\/li>\n      <li>DIN 53516 (2014), <em>Testing of rubber \u2014 Determination of abrasion resistance<\/em>. Deutsches Institut f\u00fcr Normung.<\/li>\n      <li>ISO 34-1 (2022), <em>Rubber, vulcanized or thermoplastic \u2014 Determination of tear strength \u2014 Part 1: Trouser, angle and crescent test pieces<\/em>. International Organization for Standardization.<\/li>\n      <li>GB\/T 467 (2010), <em>Cathode copper<\/em>. Chinese National Standard for electrolytic copper cathode purity, grading, and chemical analysis methods.<\/li>\n      <li>VDE Association, <em>Guidelines for Installation, Grounding, and Maintenance of Medium Voltage Cables in Switchgear and Mobile Substations<\/em>. German Electrical Engineering Association.<\/li>\n    <\/ol>\n  <\/section>\n\n  <div class=\"contact\">\n    <h3>Contact Anhui Feichun Special Cable Co., Ltd. \u2014 Single-Core MV PUR Specialists and FC-EZS\u2122 Easy-Strip Technology Pioneers<\/h3>\n    <div class=\"cg\">\n      <div class=\"ci\"><span class=\"lb\">Technical Specifications &#038; Engineering<\/span><a href=\"mailto:Tech@feichuncables.com\">Tech@feichuncables.com<\/a><\/div>\n      <div class=\"ci\"><span class=\"lb\">Procurement &#038; Volume Orders<\/span><a href=\"mailto:Tech@feichuncables.com\">Tech@feichuncables.com<\/a><\/div>\n      <div class=\"ci\"><span class=\"lb\">Emergency Support (24\/7)<\/span>+86 138 5608 5607<\/div>\n      <div class=\"ci\"><span class=\"lb\">Technical WhatsApp &#038; WeChat<\/span>+86 138 5512 3218<\/div>\n    <\/div>\n  <\/div>\n\n  <footer class=\"ft\">\n    <p>This comprehensive technical guide is based on Feichun&#8217;s proprietary BUFLEX<span class=\"tm\">\u00ae<\/span>-SC single-core medium voltage PUR cable engineering specifications featuring FC-EZS<span class=\"tm\">\u2122<\/span> Easy-Strip semi-conductive layer technology, FC-ASB<span class=\"tm\">\u2122<\/span> aramid fiber-reinforced polyurethane outer sheath, and Tongling-sourced Cu-CATH-1 grade premium electrolytic copper conductors. All claims regarding Easy-Strip peel force control, termination failure rate reduction, aramid reinforcement performance, copper purity and conductivity advantages, triple-extrusion CCV manufacturing, 100% full-length partial discharge mapping, zero-void insulation, concentric copper screening earth-fault capacity, and reduced outer diameter and bending radius compared to neoprene equivalents are based on certified test data, field operational data from switchgear, substation, mining, railway, and renewable energy installations, third-party laboratory verification, and accelerated aging simulation results. Specifications subject to change without notice. FC-EZS\u2122 and FC-ASB\u2122 are trademarks of Anhui Feichun Special Cable Co., Ltd. \u00a9 2026 Anhui Feichun Special Cable Co., Ltd. All rights reserved.<\/p>\n  <\/footer>\n\n<\/div>\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"Engineered for High-Voltage Single-Phase Routing Inside Space-Restricted Switchgear Cabinets, Mobile and Containerised Transformer Substations, Temporary Mine and Rail MV Jumper Connections, Festoon Systems, and Any Application Where Maximum Power Must Pass Through Minimum Space with Zero Termination Failures","protected":false},"author":1,"featured_media":9862,"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":[94,464,9563,1,56],"tags":[50821,50825,29746,50818,50817,50752,50565,50834,50823,50830,50831,48965,50767,50829,50551,50788,49038,50564,24435,3826,50798,44893,44303,50791,50836,50755,50793,50826,50796,4189,50822,50775,10737,45207,50789,43552,50795,50820,50778,50804,50555,50827,50833,50819,12779,50828,50824,48891,50832],"class_list":["post-9861","post","type-post","status-publish","format-standard","has-post-thumbnail","category-din-vde-0250-mining-cable","category-flexible-cables-with-high-bending-life-and-fatigue-resistance","category-medium-voltage-cable","category-uncategorized","category-reeling-cable","tag-12-20kv-pur-single-core","tag-18-30kv-single-core-pur","tag-6-10kv-flexible-cable","tag-buflex-sc-cable","tag-buflex-sc-replacement","tag-ccv-line-mv-cable","tag-chinese-premium-mv-cable","tag-compact-switchgear-wiring","tag-continuous-flexing-pur","tag-copper-braid-pur-cable","tag-corona-resistant-pur-cable","tag-direct-factory-pur-cable","tag-draka-mv-equivalent","tag-dynamic-load-single-core","tag-easy-strip-semi-conductive","tag-epr-insulated-pur-cable","tag-european-standard-equivalent","tag-feichun-engineering-solutions","tag-feichun-pur-cable","tag-feichun-special-cable","tag-flexible-copper-class-5-mv","tag-flexible-power-transmission","tag-heavy-machinery-wiring","tag-high-abrasion-mv-cable","tag-high-voltage-jumper-cable","tag-import-substitution-mv","tag-industrial-heavy-flex-pur","tag-lapp-medium-voltage-pur","tag-mechanical-stress-pur","tag-mobile-substation-cable","tag-mv-jumper-cable","tag-nexans-buflex-alternative","tag-offshore-substation-cable","tag-oil-resistant-pur-cable","tag-polyurethane-medium-voltage-cable","tag-port-terminal-electrification","tag-prysmian-pur-alternative","tag-pur-single-core-mv","tag-red-polyurethane-cable","tag-robust-industrial-pur-cable","tag-sanction-free-mv-cable","tag-screened-mv-single-core","tag-short-circuit-proof-cable","tag-single-core-flexible-mv","tag-switchgear-connection-cable","tag-tf-kable-pur-alternative","tag-thin-jacket-single-core","tag-uv-resistant-mv-cable","tag-weather-resistant-pur","cs-entry"],"_links":{"self":[{"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/posts\/9861","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=9861"}],"version-history":[{"count":1,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/posts\/9861\/revisions"}],"predecessor-version":[{"id":9863,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/posts\/9861\/revisions\/9863"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/media\/9862"}],"wp:attachment":[{"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/media?parent=9861"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/categories?post=9861"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/tags?post=9861"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}