{"id":8705,"date":"2026-03-09T13:58:02","date_gmt":"2026-03-09T05:58:02","guid":{"rendered":"https:\/\/feichuncables.com\/blog\/?p=8705"},"modified":"2026-03-09T13:58:06","modified_gmt":"2026-03-09T05:58:06","slug":"as-nzs-1972-mine-feeder-cable-6-35-11kv-3x185mm%c2%b2-swa-ampacity-derating-at-40c-for-kalimantan-coal-and-nickel-mines","status":"publish","type":"post","link":"https:\/\/feichuncables.com\/blog\/as-nzs-1972-mine-feeder-cable-6-35-11kv-3x185mm%c2%b2-swa-ampacity-derating-at-40c-for-kalimantan-coal-and-nickel-mines\/","title":{"rendered":"AS\/NZS 1972 Mine Feeder Cable 6.35\/11kV 3\u00d7185mm\u00b2 SWA: Ampacity Derating at 40\u00b0C for Kalimantan Coal and Nickel Mines"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Complete BOM Specification, Standard Clarification (Type 2S vs. Mine Feeder), Thermal Derating Calculations for Tropical Ambient, Direct Burial vs. Cable Tray Installation, Short-Circuit Withstand, and Procurement Strategy for Indonesian Mining Projects in East, South, West, North, and Central Kalimantan.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b8c\u6574 BOM \u53c2\u6570\u3001\u6807\u51c6\u7ea0\u504f\uff08Type 2S \u4e0e\u77ff\u7528\u9988\u7ebf\u7535\u7f06\u7684\u533a\u522b\uff09\u3001\u70ed\u5e26\u73af\u5883 40\u00b0C \u8f7d\u6d41\u91cf\u964d\u5bb9\u8ba1\u7b97\u3001\u76f4\u57cb\u4e0e\u6865\u67b6\u6577\u8bbe\u5bf9\u6bd4\u3001\u77ed\u8def\u8010\u53d7\u80fd\u529b\uff0c\u4ee5\u53ca\u4e1c\u3001\u5357\u3001\u897f\u3001\u5317\u3001\u4e2d\u52a0\u91cc\u66fc\u4e39\u5370\u5c3c\u77ff\u533a\u9879\u76ee\u7684\u91c7\u8d2d\u7b56\u7565\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-dominant-color=\"6f6e6d\" data-has-transparency=\"false\" style=\"--dominant-color: #6f6e6d;\" loading=\"lazy\" decoding=\"async\" width=\"885\" height=\"285\" sizes=\"auto, (max-width: 885px) 100vw, 885px\" src=\"https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-997.avif\" alt=\"\" class=\"wp-image-8709 not-transparent\" title=\"\" srcset=\"https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-997.avif 885w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-997-300x97.avif 300w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-997-768x247.avif 768w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-997-400x129.avif 400w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-997-800x258.avif 800w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-997-832x268.avif 832w\" \/><\/figure>\n\n\n\n<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n<meta charset=\"UTF-8\">\n<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n<title>AS\/NZS 1972 Type 2S 6.6kV 3x185mm\u00b2 Armoured Cable Ampacity at 40\u00b0C in Kalimantan Mines | Feichun Cable<\/title>\n<meta name=\"description\" content=\"Complete engineering guide: AS\/NZS 1972 Mine Feeder Cable 6.35\/11kV 3x185mm\u00b2 SWA ampacity derating at 40\u00b0C ambient for Kalimantan coal and nickel mines. BOM specifications, thermal derating calculations, tropical installation, direct burial vs tray, procurement strategy for Indonesian mining projects.\">\n<meta name=\"keywords\" content=\"AS\/NZS 1972 cable, AS\/NZS 1972 Mine Feeder cable, 6.6kV armoured cable, 3x185mm2 SWA cable, 6.35\/11kV XLPE cable, steel wire armoured mining cable, Kalimantan mining cable, tropical environment cable ampacity, 40C ambient cable derating, underground coal mine cable, AS 3008 ampacity, medium voltage feeder cable, EPR insulated armoured cable, SWA PVC cable, Cu-weight kg\/km, cable ampacity chart, AWG 350 MCM cable, outer diameter cable, dynamic tensile load, tinned copper conductor, copper tape screen cable, heavy duty mining cable, Indonesian mining electrification, open pit mine power supply, main feeder cable, high humidity mine cable, flame retardant mining cable, UV resistant cable sheath, cable bending radius, short circuit current 185mm2, MV cable specifications, electrical engineer BOM, industrial cable procurement, mining equipment BOM, cable RFQ, international cable standard, water blocking cable, tropicalization cable, bore hole cable, mechanical stress cable, IEC 60502-2 equivalent, VDE 0250 equivalent, cable voltage drop calculation, soil thermal resistivity, cable trench installation, direct burial MV cable, heavy lifting equipment cable, material handling cable, bulk terminal cable, OEM cable manufacturing\">\n<meta name=\"author\" content=\"Anhui Feichun Special Cable Co., Ltd.\">\n<meta name=\"geo.region\" content=\"ID-KB\">\n<meta name=\"geo.placename\" content=\"Kalimantan, Indonesia\">\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Source+Serif+4:ital,wght@0,400;0,600;0,700;0,800;1,400&#038;family=Instrument+Sans:wght@400;500;600;700&#038;family=IBM+Plex+Mono:wght@400;500&#038;display=swap\" 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p{margin-bottom:.35rem;color:var(--c-secondary)}.contact{background:var(--bg-recessed);border:1px solid var(--b-rule);border-radius:4px;padding:1.5rem;margin-top:2.5rem}.contact h3{font-size:.98rem;margin-bottom:.7rem;color:var(--c-body)}.cg{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:.75rem}.ci{font-size:.83rem;color:var(--c-secondary);line-height:1.45}.ci .lb{font-weight:600;font-size:.7rem;letter-spacing:.06em;text-transform:uppercase;color:var(--c-tertiary);display:block;margin-bottom:.1rem}.ci a{color:var(--c-link);text-decoration:none}.ft{margin-top:2rem;padding-top:1.5rem;border-top:1px solid var(--b-light);font-size:.75rem;color:var(--c-tertiary);text-align:center;line-height:1.55}@media(max-width:600px){.page-wrap{padding:1.2rem 1rem 3rem}.hdr h1{font-size:1.35rem}}<\/style>\n<\/head>\n\n<body>\n<article class=\"page-wrap\" itemscope itemtype=\"https:\/\/schema.org\/TechArticle\">\n\n  <header class=\"hdr\">\n    <span class=\"badge\">Feichun Special Cable \u2014 Mining Cable Engineering &#038; Ampacity Analysis<\/span>\n    <h1>AS\/NZS 1972 Mine Feeder Cable 6.35\/11kV 3\u00d7185mm\u00b2 SWA: Ampacity Derating at 40\u00b0C for Kalimantan Coal and Nickel Mines<\/h1>\n    <p class=\"sub\">Complete BOM Specification, Standard Clarification (Type 2S vs. Mine Feeder), Thermal Derating Calculations for Tropical Ambient, Direct Burial vs. Cable Tray Installation, Short-Circuit Withstand, and Procurement Strategy for Indonesian Mining Projects in East, South, West, North, and Central Kalimantan.<\/p>\n    <p class=\"sub-cn\">\u5b8c\u6574 BOM \u53c2\u6570\u3001\u6807\u51c6\u7ea0\u504f\uff08Type 2S \u4e0e\u77ff\u7528\u9988\u7ebf\u7535\u7f06\u7684\u533a\u522b\uff09\u3001\u70ed\u5e26\u73af\u5883 40\u00b0C \u8f7d\u6d41\u91cf\u964d\u5bb9\u8ba1\u7b97\u3001\u76f4\u57cb\u4e0e\u6865\u67b6\u6577\u8bbe\u5bf9\u6bd4\u3001\u77ed\u8def\u8010\u53d7\u80fd\u529b\uff0c\u4ee5\u53ca\u4e1c\u3001\u5357\u3001\u897f\u3001\u5317\u3001\u4e2d\u52a0\u91cc\u66fc\u4e39\u5370\u5c3c\u77ff\u533a\u9879\u76ee\u7684\u91c7\u8d2d\u7b56\u7565\u3002<\/p>\n    <div class=\"meta\">\n      <span>Anhui Feichun Special Cable Co., Ltd.<\/span> | <time datetime=\"2026-03-09\">Mar 09, 2026<\/time> | <span>Reading time: ~32 min<\/span>\n    <\/div>\n  <\/header>\n\n  <nav class=\"toc\">\n    <div class=\"toc-label\">Contents<\/div>\n    <ol>\n      <li><a href=\"#s1\">The Direct Answer: What Is This Cable and What Ampacity Should You Expect?<\/a><\/li>\n      <li><a href=\"#s2\">Standard Clarification: Why &#8220;Type 2S 6.6kV&#8221; Needs Correction on Your BOM<\/a><\/li>\n      <li><a href=\"#s3\">Why 6.35\/11kV Rating Instead of 6.6\/6.6kV for Kalimantan<\/a><\/li>\n      <li><a href=\"#s4\">Complete BOM Specifications: Dimensions, Weights, and Construction<\/a><\/li>\n      <li><a href=\"#s5\">Electrical Performance and Short-Circuit Data<\/a><\/li>\n      <li><a href=\"#s6\">Ampacity Derating at 40\u00b0C: The Core Calculation for Kalimantan<\/a><\/li>\n      <li><a href=\"#s7\">Direct Burial vs. Cable Tray: Installation-Specific Ampacity in Tropical Soil<\/a><\/li>\n      <li><a href=\"#s8\">Kalimantan Environmental Challenges: Humidity, Termites, UV, and Flooding<\/a><\/li>\n      <li><a href=\"#s9\">Equipment Compatibility: What This Cable Feeds in Indonesian Mines<\/a><\/li>\n      <li><a href=\"#s10\">Total Cost of Ownership in Tropical Mining Environments<\/a><\/li>\n      <li><a href=\"#s11\">Why Feichun Cable for Your Kalimantan Mining Project<\/a><\/li>\n      <li><a href=\"#s12\">Procurement Checklist and RFQ Guide<\/a><\/li>\n    <\/ol>\n  <\/nav>\n\n  <div class=\"body\">\n\n    <!-- ===== SECTION 1 ===== -->\n    <h2 id=\"s1\">1. The Direct Answer: What Is This Cable and What Ampacity Should You Expect?<\/h2>\n\n    <p>If you are an electrical engineer reviewing a Bill of Materials for a Kalimantan mining project and the BOM line reads &#8220;AS\/NZS 1972 Type 2S 6.6kV 3\u00d7185mm\u00b2 Armoured Cable,&#8221; the cable you actually need is an <strong>AS\/NZS 1972 Mine Feeder Cable rated 6.35\/11kV, with 3\u00d7185mm\u00b2 copper conductors, XLPE or EPR insulation, copper tape screen, and galvanised steel wire armour (SWA)<\/strong>. The &#8220;Type 2S&#8221; designation on your BOM is technically incorrect for this voltage class\u2014a point we will clarify in detail below\u2014but the intent behind the specification is clear: a heavy-duty, armoured, medium-voltage power cable for primary distribution in an underground or open-pit mine.<\/p>\n\n    <p class=\"cn\">\u5982\u679c\u60a8\u662f\u4e00\u540d\u5ba1\u67e5\u52a0\u91cc\u66fc\u4e39\u77ff\u533a\u7269\u6599\u6e05\u5355\uff08BOM\uff09\u7684\u7535\u6c14\u5de5\u7a0b\u5e08\uff0cBOM \u4e0a\u5199\u7740&#8221;AS\/NZS 1972 Type 2S 6.6kV 3\u00d7185mm\u00b2 \u94e0\u88c5\u7535\u7f06&#8221;\uff0c\u60a8\u5b9e\u9645\u9700\u8981\u7684\u662f <strong>AS\/NZS 1972 \u77ff\u7528\u9988\u7ebf\u7535\u7f06\uff0c\u989d\u5b9a 6.35\/11kV\uff0c3\u00d7185mm\u00b2 \u94dc\u5bfc\u4f53\uff0cXLPE \u6216 EPR \u7edd\u7f18\uff0c\u94dc\u5e26\u5c4f\u853d\uff0c\u9540\u950c\u94a2\u4e1d\u94e0\u88c5\uff08SWA\uff09<\/strong>\u3002BOM \u4e0a\u7684&#8221;Type 2S&#8221;\u6807\u8bc6\u5728\u6b64\u7535\u538b\u7b49\u7ea7\u4e0b\u6280\u672f\u4e0a\u4e0d\u6b63\u786e\u2014\u2014\u6211\u4eec\u5c06\u5728\u4e0b\u6587\u8be6\u7ec6\u8bf4\u660e\u2014\u2014\u4f46\u89c4\u683c\u7684\u610f\u56fe\u662f\u660e\u786e\u7684\uff1a\u7528\u4e8e\u77ff\u4e95\u4e3b\u5e72\u914d\u7535\u7684\u91cd\u578b\u94e0\u88c5\u4e2d\u538b\u7535\u529b\u7535\u7f06\u3002<\/p>\n\n    <p>The ampacity you should design around at 40\u00b0C ambient air temperature in Kalimantan is approximately <strong>420 amperes<\/strong> for cable tray or free-air installation, and approximately <strong>370 amperes<\/strong> for direct burial in tropical soil at 30\u00b0C ground temperature. These figures are derated from the standard 30\u00b0C base-case ampacity of approximately 460 A (air) and the 20\u00b0C base-case of approximately 400 A (ground), using the thermal derating methodology prescribed in AS\/NZS 3008.1.1 and IEC 60502-2. The full derivation, including the governing equations and correction factors for Kalimantan&#8217;s specific environmental conditions, follows in Sections 6 and 7.<\/p>\n\n    <div class=\"note amber\">\n      <div class=\"nt\">Critical BOM Correction for Procurement Teams<\/div>\n      <p>Do not issue an RFQ specifying &#8220;Type 2S 6.6kV.&#8221; Cable manufacturers compliant with AS\/NZS 1972 will not recognise this designation at the 6.6kV voltage class. Your RFQ should specify: <strong>&#8220;AS\/NZS 1972 Mine Feeder Cable, 6.35\/11kV, 3\u00d7185mm\u00b2, XLPE insulated, SWA, for tropical installation at 40\u00b0C ambient.&#8221;<\/strong> This corrected specification ensures that suppliers quote the correct product and that your cable will pass site inspection without documentation discrepancy.<\/p>\n      <p>\u4e0d\u8981\u53d1\u51fa\u6807\u6ce8&#8221;Type 2S 6.6kV&#8221;\u7684\u8be2\u4ef7\u5355\u3002\u7b26\u5408 AS\/NZS 1972 \u7684\u5236\u9020\u5546\u4e0d\u4f1a\u5728 6.6kV \u7535\u538b\u7b49\u7ea7\u4e0b\u8bc6\u522b\u6b64\u6807\u8bc6\u3002\u60a8\u7684 RFQ \u5e94\u6ce8\u660e\uff1a<strong>&#8220;AS\/NZS 1972 \u77ff\u7528\u9988\u7ebf\u7535\u7f06\uff0c6.35\/11kV\uff0c3\u00d7185mm\u00b2\uff0cXLPE \u7edd\u7f18\uff0cSWA\uff0c\u70ed\u5e26\u73af\u5883 40\u00b0C \u5b89\u88c5\u3002&#8221;<\/strong><\/p>\n    <\/div>\n\n\n    <!-- ===== SECTION 2 ===== -->\n    <h2 id=\"s2\">2. Standard Clarification: Why &#8220;Type 2S 6.6kV&#8221; Needs Correction on Your BOM<\/h2>\n\n    <p><strong>What AS\/NZS 1972 Actually Classifies:<\/strong> AS\/NZS 1972 is the Australian and New Zealand standard governing cables for underground mining, specifically for fixed and semi-fixed installations (as opposed to AS\/NZS 1802 which governs trailing cables for mobile equipment). Within AS\/NZS 1972, cable types are classified by their voltage rating, insulation system, screening arrangement, and intended service. &#8220;Type 2S&#8221; is a specific designation within this classification system. It refers to an elastomer-insulated (EPR), individually screened cable rated for a maximum voltage of <strong>3.3\/3.3kV<\/strong>. The &#8220;2&#8221; indicates the voltage tier (Tier 2, medium voltage up to 3.3kV), and the &#8220;S&#8221; indicates individual core screening. Type 2S cables are typically used for machine supply circuits, lighting distribution, and auxiliary power within underground coal mines\u2014applications where 3.3kV is the maximum operating voltage.<\/p>\n\n    <p class=\"cn\">AS\/NZS 1972 \u662f\u6fb3\u5927\u5229\u4e9a\u548c\u65b0\u897f\u5170\u7684\u4e95\u4e0b\u77ff\u7528\u7535\u7f06\u6807\u51c6\uff0c\u4e13\u7528\u4e8e\u56fa\u5b9a\u548c\u534a\u56fa\u5b9a\u5b89\u88c5\u3002\u5728\u8be5\u6807\u51c6\u7684\u5206\u7c7b\u4f53\u7cfb\u4e2d\uff0c&#8221;Type 2S&#8221; \u7279\u6307\u989d\u5b9a\u7535\u538b\u6700\u9ad8\u4e3a 3.3\/3.3kV \u7684\u5f39\u6027\u4f53\u7edd\u7f18\uff08EPR\uff09\u3001\u5e26\u72ec\u7acb\u5c4f\u853d\u5c42\u7684\u7535\u7f06\u3002&#8221;2&#8243;\u8868\u793a\u7535\u538b\u7b49\u7ea7\uff08\u4e2d\u538b\uff0c\u6700\u9ad8 3.3kV\uff09\uff0c&#8221;S&#8221;\u8868\u793a\u72ec\u7acb\u7ebf\u82af\u5c4f\u853d\u3002<\/p>\n\n    <p><strong>What 6.6kV Actually Requires:<\/strong> For cables operating at 6.6kV (or, more precisely, 6.35\/11kV in the AS\/NZS system), the correct classification within AS\/NZS 1972 is <strong>Mine Feeder Cable<\/strong>\u2014a designation that encompasses heavy-duty, armoured, screened power cables designed for primary distribution circuits in underground mines. Mine Feeder Cables are structurally distinct from Type 2S cables: they feature thicker insulation walls to withstand higher electrical stress, more robust screening (typically copper tape rather than copper wire braid), and mandatory steel wire armour (SWA) for mechanical protection during installation and in-service life. The insulation material is typically XLPE (cross-linked polyethylene) rather than EPR, because XLPE provides superior dielectric performance at higher voltage gradients and allows thinner insulation walls for equivalent voltage withstand.<\/p>\n\n    <p><strong>How This Mismatch Occurs in Practice:<\/strong> BOM descriptions like &#8220;Type 2S 6.6kV&#8221; typically arise when a procurement team references a previous low-voltage cable order (which was correctly specified as Type 2S at 3.3kV) and applies the same type designation to a higher-voltage cable, or when non-specialist personnel translate a general cable requirement into a BOM line without consulting the AS\/NZS 1972 classification system. This is a common and understandable error, particularly on international mining projects where multiple engineering teams contribute to the BOM across different disciplines and geographies. The practical consequence, however, is that a cable manufacturer receiving an RFQ for &#8220;Type 2S 6.6kV&#8221; faces a contradiction: the type designation specifies one product (3.3kV screened cable) while the voltage specifies another (6.35\/11kV feeder cable). Experienced manufacturers will request clarification; less experienced ones may quote the wrong product.<\/p>\n\n    <p><strong>The Correct Specification for Your Application:<\/strong> For a 6.6kV armoured power cable with 3\u00d7185mm\u00b2 conductors intended for primary mine distribution in Kalimantan, the correct AS\/NZS 1972 designation is: <strong>Mine Feeder Cable, 6.35\/11kV, 3\u00d7185mm\u00b2 Cu\/XLPE\/CTS\/SWA\/PVC<\/strong> (where CTS = copper tape screen, SWA = steel wire armour, PVC = polyvinyl chloride outer sheath). The voltage rating 6.35\/11kV provides insulation redundancy appropriate for tropical environments where humidity and contamination increase the risk of partial discharge. This rating ensures that the cable&#8217;s insulation is designed for a phase-to-earth voltage of 6.35kV and a phase-to-phase voltage of 11kV\u2014fully compatible with 6.6kV distribution systems and providing substantial margin for voltage transients.<\/p>\n\n\n    <!-- ===== SECTION 3 ===== -->\n    <h2 id=\"s3\">3. Why 6.35\/11kV Rating Instead of 6.6\/6.6kV for Kalimantan<\/h2>\n\n    <p><strong>The IT Earthing System and Voltage Notation:<\/strong> Australian mining electrical systems typically employ IT (isolated terra) earthing, where the transformer neutral is either ungrounded or grounded through a high-impedance device. In an IT system, a single phase-to-earth fault does not cause an immediate trip; instead, the voltage on the unfaulted phases rises to the full line-to-line voltage relative to earth. This is why AS\/NZS standards specify cables where the phase-to-earth rating (Uo) equals the phase-to-phase rating (U)\u2014hence designations like &#8220;3.3\/3.3kV&#8221; and &#8220;6.6\/6.6kV.&#8221; The cable insulation must withstand the full line voltage to earth under single-fault conditions.<\/p>\n\n    <p><strong>Why 6.35\/11kV Is the Practical Choice for Kalimantan:<\/strong> For mine feeder cables\u2014which are fixed installations carrying primary power over long distances through hostile environments\u2014engineers routinely specify cables one voltage tier above the system operating voltage. A 6.6kV mining distribution system is best served by cables rated 6.35\/11kV for three compelling reasons. First, insulation redundancy: in Kalimantan&#8217;s tropical environment, where humidity exceeds ninety percent for months and cable terminations are exposed to condensation, insect ingress, and mineral dust, the additional insulation thickness of an 11kV cable provides a critical safety margin against partial discharge initiation. Second, thermal endurance: thicker insulation at the 11kV rating means the cable can tolerate higher conductor temperatures during overload conditions without insulation degradation\u2014an important consideration when ambient temperatures reach forty degrees. Third, future-proofing: many Indonesian mining operations plan voltage upgrades from 6.6kV to 11kV distribution as mine depth increases and power demand grows; a cable already rated for 11kV avoids premature replacement during voltage migration.<\/p>\n\n    <p class=\"cn\">\u5bf9\u4e8e\u77ff\u7528\u9988\u7ebf\u7535\u7f06\u2014\u2014\u5373\u627f\u8f7d\u4e3b\u5e72\u7535\u6e90\u3001\u7a7f\u8d8a\u6076\u52a3\u73af\u5883\u7684\u56fa\u5b9a\u5b89\u88c5\u7535\u7f06\u2014\u2014\u5de5\u7a0b\u5e08\u901a\u5e38\u9009\u62e9\u6bd4\u7cfb\u7edf\u8fd0\u884c\u7535\u538b\u9ad8\u4e00\u4e2a\u7b49\u7ea7\u7684\u7535\u7f06\u30026.6kV \u77ff\u7528\u914d\u7535\u7cfb\u7edf\u6700\u9002\u5408\u4f7f\u7528 6.35\/11kV \u989d\u5b9a\u7684\u7535\u7f06\uff0c\u539f\u56e0\u6709\u4e09\uff1a\u7edd\u7f18\u5197\u4f59\uff08\u70ed\u5e26\u9ad8\u6e7f\u73af\u5883\u7684\u5b89\u5168\u88d5\u5ea6\uff09\u3001\u70ed\u8010\u4e45\u6027\uff0840\u00b0C \u73af\u5883\u4e0b\u8fc7\u8f7d\u4fdd\u62a4\uff09\u548c\u672a\u6765\u5347\u7ea7\u80fd\u529b\uff08\u4ece 6.6kV \u5347\u7ea7\u5230 11kV \u65e0\u9700\u66f4\u6362\u7535\u7f06\uff09\u3002<\/p>\n\n\n    <!-- ===== SECTION 4 ===== -->\n    <h2 id=\"s4\">4. Complete BOM Specifications: Dimensions, Weights, and Construction<\/h2>\n\n    <p>The following specifications describe a mine feeder cable manufactured to AS\/NZS 1972 for 6.35\/11kV service with 3\u00d7185mm\u00b2 copper conductors, XLPE insulation, copper tape screen, galvanised steel wire armour, and PVC outer sheath. These values are representative of production cables manufactured by Feichun Cable and equivalent AS\/NZS-compliant manufacturers. Exact dimensions vary by \u00b13% depending on manufacturing tolerances and specific compound formulations.<\/p>\n\n    <div class=\"tw\">\n      <caption>Table 1 \u2014 Structural and Dimensional Specifications: 6.35\/11kV 3\u00d7185mm\u00b2 Mine Feeder Cable (SWA)<\/caption>\n      <table>\n        <thead>\n          <tr>\n            <th>Parameter<\/th>\n            <th>Specification<\/th>\n            <th>Engineering Notes<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <td>Standard Reference<\/td>\n            <td class=\"g\">AS\/NZS 1972 (Mine Feeder Cable)<\/td>\n            <td>Also cross-references IEC 60502-2, AS\/NZS 3008.1.1<\/td>\n          <\/tr>\n          <tr>\n            <td>Voltage Rating (Uo\/U)<\/td>\n            <td class=\"g\">6.35 \/ 11 kV<\/td>\n            <td>Backward-compatible with 6.6kV systems; provides insulation redundancy for tropical service<\/td>\n          <\/tr>\n          <tr>\n            <td>Number of Cores \u00d7 Cross-Section<\/td>\n            <td class=\"g\">3 \u00d7 185 mm\u00b2 (Power)<\/td>\n            <td>Approximate AWG equivalent: 350 MCM (kcmil)<\/td>\n          <\/tr>\n          <tr>\n            <td>Conductor Material<\/td>\n            <td class=\"g\">Annealed copper, Class 2 stranded (compacted circular)<\/td>\n            <td>Tinned copper available on request for enhanced corrosion resistance in coastal Kalimantan<\/td>\n          <\/tr>\n          <tr>\n            <td>Conductor Diameter (per core)<\/td>\n            <td>~16.2 mm<\/td>\n            <td>Class 2 stranded, compacted for reduced overall diameter<\/td>\n          <\/tr>\n          <tr>\n            <td>Insulation Material<\/td>\n            <td class=\"g\">XLPE (Cross-linked Polyethylene)<\/td>\n            <td>EPR (Ethylene Propylene Rubber) available as alternative for enhanced flexibility<\/td>\n          <\/tr>\n          <tr>\n            <td>Insulation Thickness (nominal)<\/td>\n            <td>3.4 mm<\/td>\n            <td>Per IEC 60502-2 for 6.35\/11kV rating; provides 170% insulation margin over 6.6kV requirement<\/td>\n          <\/tr>\n          <tr>\n            <td>Conductor Screen<\/td>\n            <td>Extruded semiconductive compound<\/td>\n            <td>Bonded to insulation; prevents corona discharge at conductor surface<\/td>\n          <\/tr>\n          <tr>\n            <td>Insulation Screen<\/td>\n            <td>Strippable semiconductive compound + copper tape<\/td>\n            <td>Copper tape (0.1 mm minimum thickness) provides equipotential surface and fault current return<\/td>\n          <\/tr>\n          <tr>\n            <td>Core Lay-Up<\/td>\n            <td>Three cores laid up with non-hygroscopic fillers<\/td>\n            <td>Fillers prevent water migration between cores; critical for Kalimantan humidity<\/td>\n          <\/tr>\n          <tr>\n            <td>Inner Sheath (Bedding)<\/td>\n            <td>Extruded PVC compound<\/td>\n            <td>Provides cushion between cores and armour wires; prevents armour from indenting insulation<\/td>\n          <\/tr>\n          <tr>\n            <td>Armour Type<\/td>\n            <td class=\"g\">Galvanised Steel Wire Armour (SWA)<\/td>\n            <td>Round wire for three-core cables; provides crush resistance (>3 kN\/50mm) and tensile strength for vertical installation<\/td>\n          <\/tr>\n          <tr>\n            <td>Armour Wire Diameter<\/td>\n            <td>~2.5 mm<\/td>\n            <td>Galvanised to AS 1442 for corrosion resistance in tropical humidity<\/td>\n          <\/tr>\n          <tr>\n            <td>Outer Sheath Material<\/td>\n            <td class=\"g\">Black PVC (flame retardant, UV stabilised) or CPE for enhanced chemical resistance<\/td>\n            <td>Anti-termite additive available for Kalimantan direct burial applications<\/td>\n          <\/tr>\n          <tr>\n            <td>Outer Sheath Thickness<\/td>\n            <td>~2.8 mm<\/td>\n            <td>Enhanced from standard 2.4 mm for tropical abrasion and UV resistance<\/td>\n          <\/tr>\n          <tr>\n            <td>Overall Outer Diameter (min\u2013max)<\/td>\n            <td class=\"g\">67.0 \u2013 74.0 mm<\/td>\n            <td>Verify against cable gland sizing; M75 or M80 glands typically required<\/td>\n          <\/tr>\n          <tr>\n            <td>Minimum Bending Radius (installed)<\/td>\n            <td>12 \u00d7 OD \u2248 890 mm<\/td>\n            <td>During installation: 15 \u00d7 OD \u2248 1,110 mm; critical for cable tray routing in confined mine areas<\/td>\n          <\/tr>\n          <tr>\n            <td>Copper Weight<\/td>\n            <td class=\"g\">~5,200 kg\/km<\/td>\n            <td>Includes phase conductors + copper tape screens; significant cost driver<\/td>\n          <\/tr>\n          <tr>\n            <td>Total Cable Weight<\/td>\n            <td class=\"g\">11,500 \u2013 12,500 kg\/km<\/td>\n            <td>SWA contributes approximately 35% of total weight; requires heavy-duty drum handling<\/td>\n          <\/tr>\n          <tr>\n            <td>Maximum Drum Weight (500m length)<\/td>\n            <td>~6,250 kg + drum<\/td>\n            <td>Requires crane or forklift with \u22658-tonne capacity for handling on Kalimantan mine sites<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n\n\n    <!-- ===== SECTION 5 ===== -->\n    <h2 id=\"s5\">5. Electrical Performance and Short-Circuit Data<\/h2>\n\n    <div class=\"tw\">\n      <caption>Table 2 \u2014 Electrical Performance Data: 6.35\/11kV 3\u00d7185mm\u00b2 Mine Feeder Cable<\/caption>\n      <table>\n        <thead>\n          <tr>\n            <th>Electrical Parameter<\/th>\n            <th>Value<\/th>\n            <th>Reference Standard \/ Notes<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <td>Maximum Conductor Temperature (continuous)<\/td>\n            <td class=\"g\">90\u00b0C<\/td>\n            <td>XLPE insulation per IEC 60502-2; EPR variant also rated 90\u00b0C<\/td>\n          <\/tr>\n          <tr>\n            <td>Maximum Conductor Temperature (emergency overload)<\/td>\n            <td>130\u00b0C<\/td>\n            <td>Limited to 100 hours cumulative over cable lifetime<\/td>\n          <\/tr>\n          <tr>\n            <td>Maximum Short-Circuit Temperature<\/td>\n            <td>250\u00b0C<\/td>\n            <td>For duration \u22645 seconds; XLPE insulation limit<\/td>\n          <\/tr>\n          <tr>\n            <td>DC Resistance @ 20\u00b0C<\/td>\n            <td class=\"g\">0.0991 \u03a9\/km<\/td>\n            <td>Per IEC 60228 Class 2; basis for voltage drop calculation<\/td>\n          <\/tr>\n          <tr>\n            <td>AC Resistance @ 90\u00b0C<\/td>\n            <td>~0.128 \u03a9\/km<\/td>\n            <td>Includes skin and proximity effects; temperature-corrected<\/td>\n          <\/tr>\n          <tr>\n            <td>Positive Sequence Inductance<\/td>\n            <td>~0.28 mH\/km<\/td>\n            <td>Trefoil configuration; affects voltage drop at lagging power factor<\/td>\n          <\/tr>\n          <tr>\n            <td>Capacitance (per phase)<\/td>\n            <td>~0.31 \u03bcF\/km<\/td>\n            <td>Relevant for charging current and resonance analysis on long runs<\/td>\n          <\/tr>\n          <tr>\n            <td>1-Second Short-Circuit Current (phase conductor)<\/td>\n            <td class=\"g\">26.4 kA<\/td>\n            <td>Calculated per IEC 60949 for 185mm\u00b2 Cu from 90\u00b0C to 250\u00b0C in 1 second<\/td>\n          <\/tr>\n          <tr>\n            <td>1-Second Short-Circuit Current (copper tape screen)<\/td>\n            <td>~4.2 kA<\/td>\n            <td>Screen must withstand earth fault current for protection coordination<\/td>\n          <\/tr>\n          <tr>\n            <td>Insulation Resistance @ 20\u00b0C<\/td>\n            <td>\u2265 500 M\u03a9\u00b7km<\/td>\n            <td>After water immersion test; verifies insulation integrity<\/td>\n          <\/tr>\n          <tr>\n            <td>Partial Discharge Level<\/td>\n            <td>\u2264 5 pC @ 1.73 \u00d7 Uo<\/td>\n            <td>Critical quality indicator; lower values indicate superior insulation quality<\/td>\n          <\/tr>\n          <tr>\n            <td>Voltage Drop per km @ 420A, PF 0.85<\/td>\n            <td>~67 V\/km (per phase)<\/td>\n            <td>At derated ampacity; verify total drop meets \u00b15% requirement for feeder circuit length<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n\n    <p><strong>Short-Circuit Withstand Significance for Kalimantan Mines:<\/strong> The 26.4 kA one-second short-circuit rating of the 185mm\u00b2 phase conductor is a critical design parameter. In Kalimantan mining operations, the main feeder cable connects the surface high-voltage switchgear (typically a ring main unit or outdoor switchboard) to underground or pit-bottom distribution substations. The prospective fault level at the cable origin depends on the supply transformer rating and source impedance. For a typical 10\/15 MVA, 33\/6.6kV mine supply transformer, the prospective fault current at the 6.6kV bus may reach 10\u201315 kA. The 185mm\u00b2 conductor&#8217;s 26.4 kA one-second rating provides comfortable margin, but the copper tape screen&#8217;s 4.2 kA rating must be verified against the actual earth fault current magnitude and protection clearing time. If earth fault current exceeds 4.2 kA or clearing time exceeds one second, the screen cross-section must be increased\u2014a common modification for mines with high fault levels.<\/p>\n\n\n    <!-- ===== SECTION 6 ===== -->\n    <h2 id=\"s6\">6. Ampacity Derating at 40\u00b0C: The Core Calculation for Kalimantan<\/h2>\n\n    <p><strong>Why 40\u00b0C Is the Correct Design Ambient for Kalimantan:<\/strong> Kalimantan\u2014comprising the Indonesian provinces of East Kalimantan (Kaltim), South Kalimantan (Kalsel), West Kalimantan (Kalbar), North Kalimantan (Kaltara), and Central Kalimantan (Kalteng)\u2014experiences tropical equatorial climate with typical daytime air temperatures of 32\u201336\u00b0C. However, cables installed on exposed cable trays in direct sunlight, or inside unventilated cable trenches with metal covers, experience effective ambient temperatures of 40\u201345\u00b0C due to solar radiation gain and restricted airflow. Australian and international cable standards (AS\/NZS 3008.1.1, IEC 60287) specify 30\u00b0C as the base ambient air temperature for published ampacity tables. Kalimantan conditions therefore require mandatory thermal derating. Using 40\u00b0C as the design ambient is conservative but appropriate for reliable continuous operation; cables exposed to direct afternoon sun on steel trays may warrant 45\u00b0C design ambient.<\/p>\n\n    <h3>Derating Formula and Derivation<\/h3>\n\n    <p>The thermal derating factor for elevated ambient temperature is derived from the fundamental heat balance equation governing cable ampacity. The maximum continuous current a cable can carry is limited by the maximum permissible conductor temperature (90\u00b0C for XLPE). As ambient temperature increases, the available temperature rise (T<sub>max<\/sub> \u2212 T<sub>ambient<\/sub>) decreases, reducing the permissible heat generation and therefore the permissible current. The derating factor is:<\/p>\n\n    <div class=\"eq\">\n      k = \u221a[ (T<sub>max<\/sub> \u2212 T<sub>ambient,actual<\/sub>) \/ (T<sub>max<\/sub> \u2212 T<sub>ambient,base<\/sub>) ]\n    <\/div>\n\n    <p>For XLPE insulation at 90\u00b0C maximum, with actual ambient of 40\u00b0C and base ambient of 30\u00b0C:<\/p>\n\n    <div class=\"eq\">\n      k = \u221a[ (90 \u2212 40) \/ (90 \u2212 30) ] = \u221a[ 50 \/ 60 ] = \u221a0.8333 = 0.913\n    <\/div>\n\n    <p>Applying this factor to the base ampacity of 460 A (3\u00d7185mm\u00b2 in free air at 30\u00b0C, trefoil touching, per AS\/NZS 3008.1.1 Table 22):<\/p>\n\n    <div class=\"eq\">\n      I<sub>40\u00b0C<\/sub> = 460 \u00d7 0.913 \u2248 <strong>420 A<\/strong>\n    <\/div>\n\n    <p class=\"cn\">\u5728\u52a0\u91cc\u66fc\u4e39 40\u00b0C \u73af\u5883\u6e29\u5ea6\u4e0b\uff0c3\u00d7185mm\u00b2 XLPE \u94e0\u88c5\u7535\u7f06\u5728\u7535\u7f06\u6865\u67b6\u4e0a\u81ea\u7531\u7a7a\u6c14\u4e2d\u7684\u6700\u5927\u5b89\u5168\u6301\u7eed\u8f7d\u6d41\u91cf\u4e3a <strong>420 \u5b89\u57f9<\/strong>\u3002\u8fd9\u662f\u57fa\u4e8e AS\/NZS 3008.1.1 \u548c IEC 60287 \u7684\u6807\u51c6\u964d\u5bb9\u8ba1\u7b97\u3002<\/p>\n\n    <div class=\"note blue\">\n      <div class=\"nt\">Additional Derating Factors to Consider<\/div>\n      <p><strong>Multiple cable grouping:<\/strong> If more than one circuit is installed on the same cable tray, additional grouping derating factors apply. Two circuits touching on a tray: factor 0.87. Three circuits: factor 0.82. For example, two circuits at 40\u00b0C ambient: I = 460 \u00d7 0.913 \u00d7 0.87 \u2248 365 A per circuit.<\/p>\n      <p><strong>Solar radiation correction:<\/strong> AS\/NZS 3008.1.1 Clause 3.4.3.1 specifies that cables exposed to direct solar radiation should add 15\u00b0C to the ambient temperature for derating purposes. If designing for exposed tray installation in Kalimantan, the effective design ambient becomes 40 + 15 = 55\u00b0C, yielding: k = \u221a[(90\u221255)\/(90\u221230)] = \u221a0.583 = 0.764, and I = 460 \u00d7 0.764 \u2248 351 A. Providing shade covers on cable trays eliminates this severe additional derating.<\/p>\n    <\/div>\n\n    <div class=\"tw\">\n      <caption>Table 3 \u2014 Ampacity at Various Ambient Temperatures: 6.35\/11kV 3\u00d7185mm\u00b2 XLPE\/SWA (Free Air, Single Circuit, Trefoil)<\/caption>\n      <table>\n        <thead>\n          <tr>\n            <th>Ambient Temperature (\u00b0C)<\/th>\n            <th>Derating Factor (k)<\/th>\n            <th>Ampacity (A)<\/th>\n            <th>Typical Location Context<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <td>25\u00b0C<\/td>\n            <td>1.040<\/td>\n            <td class=\"g\">~478 A<\/td>\n            <td>Underground mine (stable rock temperature)<\/td>\n          <\/tr>\n          <tr>\n            <td>30\u00b0C (base)<\/td>\n            <td>1.000<\/td>\n            <td class=\"g\">460 A<\/td>\n            <td>Standard reference condition (AS\/NZS 3008)<\/td>\n          <\/tr>\n          <tr>\n            <td>35\u00b0C<\/td>\n            <td>0.957<\/td>\n            <td>~440 A<\/td>\n            <td>Shaded cable tray, Kalimantan morning\/evening<\/td>\n          <\/tr>\n          <tr>\n            <td>40\u00b0C<\/td>\n            <td>0.913<\/td>\n            <td class=\"g\"><strong>~420 A<\/strong><\/td>\n            <td>Kalimantan standard design ambient (enclosed tray, afternoon heat)<\/td>\n          <\/tr>\n          <tr>\n            <td>45\u00b0C<\/td>\n            <td>0.866<\/td>\n            <td class=\"r\">~398 A<\/td>\n            <td>Kalimantan extreme: unshaded steel tray, midday direct sun<\/td>\n          <\/tr>\n          <tr>\n            <td>50\u00b0C<\/td>\n            <td>0.816<\/td>\n            <td class=\"r\">~375 A<\/td>\n            <td>Engine room, near heat-generating equipment<\/td>\n          <\/tr>\n          <tr>\n            <td>55\u00b0C (solar correction)<\/td>\n            <td>0.764<\/td>\n            <td class=\"r\">~351 A<\/td>\n            <td>Per AS\/NZS 3008 solar radiation adjustment (+15\u00b0C to ambient)<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n\n\n    <!-- ===== SECTION 7 ===== -->\n    <h2 id=\"s7\">7. Direct Burial vs. Cable Tray: Installation-Specific Ampacity in Tropical Soil<\/h2>\n\n    <p><strong>Direct Burial in Kalimantan Soil:<\/strong> Many Kalimantan mining operations bury main feeder cables directly in the ground to protect them from vehicle traffic, falling rock, and tropical storms. The ampacity of a directly buried cable depends on soil thermal resistivity (measured in K\u00b7m\/W) and soil temperature. Kalimantan soils vary significantly: coastal alluvial soils (common in river delta mining areas) are moist and have low thermal resistivity (~0.7\u20130.9 K\u00b7m\/W), which is favourable for cable cooling. Inland laterite soils (common in nickel mining areas of Central and Southeast Kalimantan) can be dry and have high thermal resistivity (~1.2\u20132.0 K\u00b7m\/W), which severely restricts cable ampacity. The standard reference condition for buried cable ampacity is 20\u00b0C soil temperature with 1.0 K\u00b7m\/W soil thermal resistivity (IEC 60287 \/ AS\/NZS 3008.1.1). Under these conditions, 3\u00d7185mm\u00b2 XLPE\/SWA cable carries approximately 400 A.<\/p>\n\n    <h3>Buried Cable Derating for Kalimantan Conditions<\/h3>\n\n    <p>Kalimantan shallow soil temperature (burial depth 800\u20131000mm) is typically 28\u201332\u00b0C year-round due to the tropical climate. Using 30\u00b0C as the design soil temperature:<\/p>\n\n    <div class=\"eq\">\n      k<sub>ground<\/sub> = \u221a[ (90 \u2212 30) \/ (90 \u2212 20) ] = \u221a[ 60 \/ 70 ] = \u221a0.857 = 0.926\n    <\/div>\n\n    <div class=\"eq\">\n      I<sub>ground, 30\u00b0C<\/sub> = 400 \u00d7 0.926 \u2248 <strong>370 A<\/strong>\n    <\/div>\n\n    <p>This 370 A figure assumes standard soil thermal resistivity of 1.0 K\u00b7m\/W. In dry laterite soils at 1.5 K\u00b7m\/W, the ampacity drops further to approximately 310\u2013320 A. In moist alluvial soils at 0.7 K\u00b7m\/W, the ampacity improves to approximately 400\u2013410 A. Soil thermal resistivity testing\u2014using a thermal needle probe at the actual cable route\u2014is strongly recommended before finalising the cable size for buried installation in Kalimantan. If thermal resistivity testing reveals unfavourable soil conditions, corrective measures include backfilling the cable trench with thermally favourable material (sand-cement mix at ~0.6 K\u00b7m\/W), increasing burial depth to reach cooler soil layers, or upsizing the cable to the next conductor size (240mm\u00b2).<\/p>\n\n    <div class=\"tw\">\n      <caption>Table 4 \u2014 Direct Burial Ampacity at Various Soil Conditions: 6.35\/11kV 3\u00d7185mm\u00b2 (Depth 900mm, Single Circuit)<\/caption>\n      <table>\n        <thead>\n          <tr>\n            <th>Soil Temperature<\/th>\n            <th>Soil Thermal Resistivity (K\u00b7m\/W)<\/th>\n            <th>Ampacity (A)<\/th>\n            <th>Kalimantan Context<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <td>20\u00b0C (base)<\/td>\n            <td>1.0 (standard)<\/td>\n            <td class=\"g\">~400 A<\/td>\n            <td>Reference condition (not typical in Kalimantan)<\/td>\n          <\/tr>\n          <tr>\n            <td>25\u00b0C<\/td>\n            <td>1.0<\/td>\n            <td class=\"g\">~388 A<\/td>\n            <td>Deep mine access road, shaded terrain<\/td>\n          <\/tr>\n          <tr>\n            <td>30\u00b0C<\/td>\n            <td>1.0<\/td>\n            <td class=\"g\"><strong>~370 A<\/strong><\/td>\n            <td>Kalimantan standard design soil temperature<\/td>\n          <\/tr>\n          <tr>\n            <td>30\u00b0C<\/td>\n            <td>0.7 (moist alluvial)<\/td>\n            <td class=\"g\">~410 A<\/td>\n            <td>Coastal \/ river delta mining areas (Kalsel, Kalbar)<\/td>\n          <\/tr>\n          <tr>\n            <td>30\u00b0C<\/td>\n            <td>1.5 (dry laterite)<\/td>\n            <td class=\"r\">~315 A<\/td>\n            <td>Inland nickel mining areas (Kalteng, Kaltim) during dry season<\/td>\n          <\/tr>\n          <tr>\n            <td>30\u00b0C<\/td>\n            <td>2.0 (very dry)<\/td>\n            <td class=\"r\">~275 A<\/td>\n            <td>Post-deforestation exposed laterite; consider thermal backfill mandatory<\/td>\n          <\/tr>\n          <tr>\n            <td>35\u00b0C<\/td>\n            <td>1.0<\/td>\n            <td class=\"r\">~355 A<\/td>\n            <td>Shallow burial near sun-exposed haul roads<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n\n    <div class=\"note amber\">\n      <div class=\"nt\">Engineering Recommendation: Thermal Backfill for Kalimantan Buried Cables<\/div>\n      <p>In Kalimantan&#8217;s laterite soils, we strongly recommend specifying thermal backfill (controlled low-strength material or sand-cement slurry at 0.5\u20130.7 K\u00b7m\/W) in the cable trench for a minimum of 150mm surrounding the cable on all sides. This single measure can increase buried cable ampacity by 15\u201325% compared to native soil installation, often making the difference between 185mm\u00b2 being adequate or requiring upsizing to 240mm\u00b2. The cost of thermal backfill material (~USD 8\u201312 per linear metre of trench) is trivial compared to the cost of cable upsizing (~USD 30\u201340 per linear metre additional).<\/p>\n    <\/div>\n\n\n    <!-- ===== SECTION 8 ===== -->\n    <h2 id=\"s8\">8. Kalimantan Environmental Challenges: Humidity, Termites, UV, and Flooding<\/h2>\n\n    <p><strong>Humidity and Condensation:<\/strong> Kalimantan&#8217;s relative humidity routinely exceeds ninety percent during the wet season (October\u2013March) and rarely drops below seventy-five percent even during the drier months. This persistent humidity creates condensation risk at cable terminations, junction boxes, and switchgear cable entries\u2014precisely the locations where insulation is most vulnerable. For a 6.35\/11kV mine feeder cable, moisture ingress into terminations can initiate water treeing within XLPE insulation, leading to progressive insulation degradation and eventual failure. Cable terminations in Kalimantan should be specified with heat-shrink or cold-shrink technology incorporating moisture-blocking mastic, and termination enclosures should include silica gel breathers or pressurised gas sealing where the mining operation&#8217;s maintenance capacity permits. Feichun Cable supplies mine feeder cables with optional water-blocking tape between cores to retard longitudinal water migration if a termination seal is compromised.<\/p>\n\n    <p><strong>Termite Attack on Cable Sheaths:<\/strong> Subterranean termites are endemic throughout Kalimantan and actively attack cable outer sheaths, particularly PVC and polyethylene compounds. Termite damage to directly buried cables is a well-documented failure mode in Southeast Asian mining and infrastructure projects. Standard PVC outer sheaths provide minimal termite resistance. For Kalimantan direct burial applications, Feichun Cable offers two protective measures: first, a nylon over-sheath (polyamide 12) applied over the PVC outer sheath, which provides a physical barrier that termites cannot penetrate; second, PVC compounds incorporating termite-deterrent additives (typically naphthalene-based or pyrethroid-based compounds) that discourage termite feeding. The cost premium for anti-termite protection is approximately five to eight percent above standard cable price\u2014a negligible investment relative to the cost of excavating and replacing a failed buried cable in an operating mine.<\/p>\n\n    <p><strong>Ultraviolet Radiation:<\/strong> Kalimantan sits on the equator, receiving intense UV radiation year-round. Cable trays exposed to direct sunlight subject the cable outer sheath to UV degradation that can embrittle PVC within three to five years, causing surface cracking, chalking, and loss of mechanical integrity. Standard black PVC sheaths incorporate carbon black UV stabilisers that provide reasonable UV resistance (five to eight years at tropical UV intensity). For enhanced UV life, Feichun Cable specifies high-density polyethylene (HDPE) or chlorinated polyethylene (CPE) outer sheaths that resist UV degradation for ten to fifteen years. Where cable trays cannot be shaded, the additional cost of a UV-resistant sheath material is justified by extended cable life.<\/p>\n\n    <p><strong>Flooding and Submersion:<\/strong> Kalimantan&#8217;s intense seasonal rainfall (2,500\u20134,000mm annually) causes frequent flooding of mine access roads, cable trenches, and low-lying cable routes. A directly buried mine feeder cable may be intermittently submerged in standing water for days or weeks during flood events. The cable must withstand this submersion without insulation degradation. XLPE insulation is inherently moisture-resistant and does not absorb water to a degree that affects dielectric performance over the cable&#8217;s design life. However, the SWA steel wires will corrode if the galvanised coating is damaged during installation\u2014a common occurrence when cables are pulled through rocky trenches. Feichun Cable applies a bituminous anti-corrosion compound between the inner sheath and armour wires, and between the armour wires and outer sheath, to provide additional corrosion protection in Kalimantan&#8217;s wet environment.<\/p>\n\n    <p class=\"cn\">\u52a0\u91cc\u66fc\u4e39\u73af\u5883\u5bf9\u7535\u7f06\u63d0\u51fa\u56db\u5927\u6311\u6218\uff1a\u6301\u7eed\u9ad8\u6e7f\uff08\u5168\u5e74 75\u201390%+ \u76f8\u5bf9\u6e7f\u5ea6\u5bfc\u81f4\u7ec8\u7aef\u51dd\u9732\u548c\u6c34\u6811\u679d\uff09\u3001\u767d\u8681\uff08\u4fb5\u8680\u76f4\u57cb\u7535\u7f06\u5916\u62a4\u5957\uff09\u3001\u7d2b\u5916\u7ebf\uff08\u8d64\u9053\u5f3a\u7d2b\u5916\u52a0\u901f PVC \u8001\u5316\uff09\u548c\u6d2a\u6c34\uff08\u5b63\u8282\u6027\u6df9\u6ca1\u7535\u7f06\u6c9f\u69fd\uff09\u3002\u98de\u6625\u7535\u7f06\u9488\u5bf9\u6bcf\u9879\u6311\u6218\u63d0\u4f9b\u4e13\u9879\u4fdd\u62a4\u63aa\u65bd\uff1a\u9632\u6c34\u5c01\u5835\u5e26\u3001\u9632\u767d\u8681\u62a4\u5957\u3001\u6297 UV \u6750\u6599\u548c\u6ca5\u9752\u9632\u8150\u5c42\u3002<\/p>\n\n\n    <!-- ===== SECTION 9 ===== -->\n    <h2 id=\"s9\">9. Equipment Compatibility: What This Cable Feeds in Indonesian Mines<\/h2>\n\n    <p>A 6.35\/11kV 3\u00d7185mm\u00b2 mine feeder cable at 420 A derated capacity in Kalimantan serves as the primary power backbone for a range of mining equipment and infrastructure. Understanding what this cable feeds helps verify that the 185mm\u00b2 conductor size and 420 A ampacity are appropriate for the specific mine&#8217;s electrical load profile.<\/p>\n\n    <div class=\"tw\">\n      <caption>Table 5 \u2014 Typical Loads Served by 6.35\/11kV 3\u00d7185mm\u00b2 Mine Feeder Cable in Kalimantan<\/caption>\n      <table>\n        <thead>\n          <tr>\n            <th>Load \/ Equipment<\/th>\n            <th>Typical Power Rating<\/th>\n            <th>Typical Current at 6.6kV<\/th>\n            <th>Cable Utilisation at 420 A<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <td>Underground distribution substation (6.6kV \u2192 1kV)<\/td>\n            <td>2.0 \u2013 4.0 MVA<\/td>\n            <td>175 \u2013 350 A<\/td>\n            <td class=\"g\">42% \u2013 83%<\/td>\n          <\/tr>\n          <tr>\n            <td>Large dewatering pump station (3\u20134 pumps)<\/td>\n            <td>1.5 \u2013 3.0 MVA<\/td>\n            <td>130 \u2013 260 A<\/td>\n            <td class=\"g\">31% \u2013 62%<\/td>\n          <\/tr>\n          <tr>\n            <td>Main ventilation fan (surface or underground)<\/td>\n            <td>0.5 \u2013 2.0 MW<\/td>\n            <td>44 \u2013 175 A<\/td>\n            <td class=\"g\">10% \u2013 42%<\/td>\n          <\/tr>\n          <tr>\n            <td>Conveyor drive station (primary belt conveyor)<\/td>\n            <td>1.0 \u2013 3.0 MW<\/td>\n            <td>88 \u2013 260 A<\/td>\n            <td class=\"g\">21% \u2013 62%<\/td>\n          <\/tr>\n          <tr>\n            <td>Crusher and screening plant<\/td>\n            <td>2.0 \u2013 5.0 MW<\/td>\n            <td>175 \u2013 440 A<\/td>\n            <td class=\"r\">42% \u2013 105%<\/td>\n          <\/tr>\n          <tr>\n            <td>Coal handling and preparation plant (CHPP) feed<\/td>\n            <td>3.0 \u2013 8.0 MVA<\/td>\n            <td>260 \u2013 700 A<\/td>\n            <td class=\"r\">62% \u2013 167%<\/td>\n          <\/tr>\n          <tr>\n            <td>Workshop and maintenance facility<\/td>\n            <td>0.3 \u2013 0.8 MVA<\/td>\n            <td>26 \u2013 70 A<\/td>\n            <td class=\"g\">6% \u2013 17%<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n\n    <p>The equipment compatibility table reveals that a single 3\u00d7185mm\u00b2 mine feeder cable at 420 A (40\u00b0C derated) comfortably feeds underground distribution substations, pump stations, ventilation fans, conveyor drives, and workshop facilities. For larger loads such as crusher plants or CHPPs, the 185mm\u00b2 conductor may be insufficient\u2014two parallel cables or upsizing to 240mm\u00b2 or 300mm\u00b2 should be evaluated. This analysis should be performed during detailed mine electrical design, using actual equipment nameplate data and diversity factors rather than the indicative ranges provided here.<\/p>\n\n\n    <!-- ===== SECTION 10 ===== -->\n    <h2 id=\"s10\">10. Total Cost of Ownership in Tropical Mining Environments<\/h2>\n\n    <p><strong>Initial Cable Cost:<\/strong> A 6.35\/11kV 3\u00d7185mm\u00b2 XLPE\/SWA\/PVC mine feeder cable manufactured to AS\/NZS 1972 specifications costs approximately USD 85\u2013110 per metre, depending on copper price fluctuations, order volume, and specific tropical protection options (anti-termite, enhanced UV, water blocking). A typical mine feeder run of 500\u20132,000 metres represents a cable cost of USD 42,500\u2013220,000. This is a significant but not dominant component of the total mine electrical infrastructure cost.<\/p>\n\n    <p><strong>Installation Cost in Kalimantan:<\/strong> Cable installation in Kalimantan involves challenges that increase cost relative to temperate-climate installations. Direct burial requires excavation through laterite soils (which can be extremely hard during dry season and unstable during wet season), thermal backfill supply and placement, and reinstatement of the cable route to withstand heavy mining vehicle traffic. Cable tray installation requires fabrication and erection of galvanised cable tray structures rated for tropical wind loads and the cable weight (approximately 12 kg per metre of cable on the tray). Installation labour costs in Kalimantan are moderate by international mining standards (approximately USD 15\u201325 per metre of installed cable for direct burial, USD 20\u201335 per metre for tray installation including tray structure), but mobilisation of specialised cable jointing technicians may require importing expertise from Java or Singapore, adding cost and schedule risk.<\/p>\n\n    <p><strong>Failure Cost and Replacement Implications:<\/strong> A feeder cable failure in an operating Kalimantan mine typically causes the following costs: loss of production during the outage (which for a primary feeder cable affects the entire mine or a major production area), emergency fault location and diagnosis (requiring specialised testing equipment that may not be available on site), emergency cable procurement (if spares are not held, lead time for replacement cable delivery to a Kalimantan mine site is typically four to eight weeks including manufacturing and logistics), splicing or complete replacement installation, and re-commissioning and testing. The total cost of a single unplanned feeder cable failure\u2014including production losses\u2014can easily reach USD 200,000\u2013500,000 for a medium-sized coal or nickel mine operating at full production. This reality underscores the importance of specifying the correct cable for Kalimantan conditions (including tropical protection measures) rather than selecting the lowest initial-cost option.<\/p>\n\n    <p class=\"cn\">\u5728\u52a0\u91cc\u66fc\u4e39\u77ff\u533a\uff0c\u4e00\u6b21\u8ba1\u5212\u5916\u9988\u7ebf\u7535\u7f06\u6545\u969c\u7684\u603b\u6210\u672c\uff08\u5305\u62ec\u4ea7\u91cf\u635f\u5931\uff09\u53ef\u8f7b\u677e\u8fbe\u5230 20 \u4e07\u81f3 50 \u4e07\u7f8e\u5143\u3002\u56e0\u6b64\uff0c\u5728\u521d\u59cb\u91c7\u8d2d\u65f6\u6295\u8d44\u6b63\u786e\u7684\u70ed\u5e26\u9632\u62a4\u63aa\u65bd\uff08\u9632\u767d\u8681\u3001\u6297\u7d2b\u5916\u3001\u9632\u6c34\u5c01\u5835\uff09\u8fdc\u6bd4\u9009\u62e9\u6700\u4f4e\u4ef7\u4ea7\u54c1\u66f4\u5177\u7ecf\u6d4e\u6027\u3002<\/p>\n\n\n    <!-- ===== SECTION 11 ===== -->\n    <h2 id=\"s11\">11. Why Feichun Cable for Your Kalimantan Mining Project<\/h2>\n\n    <p><strong>Custom Manufactured for Tropical Mining Markets:<\/strong> Many cable manufacturers produce mine feeder cables designed for temperate climates (Australia, South Africa, Northern Europe) and do not offer tropical-specific modifications as standard options. Feichun Cable specialises in manufacturing AS\/NZS-compliant mine feeder cables with built-in tropical protection features\u2014anti-termite sheath compounds, enhanced UV stabilisation, water-blocking tapes, and bituminous armour protection\u2014without treating these as expensive custom additions. Because a significant portion of our production serves Southeast Asian mining markets (Indonesia, Philippines, Papua New Guinea), our manufacturing processes are configured for tropical specifications as a production-line standard rather than a one-off customisation.<\/p>\n\n    <p><strong>Standard Compliance with Custom Printing:<\/strong> One frequently overlooked procurement challenge in Indonesian mining is cable jacket printing. Indonesian mining inspectors (from the Ministry of Energy and Mineral Resources, or ESDM) require specific markings on cable sheaths, including manufacturer identification, standard reference, voltage rating, conductor size, and manufacturing date. AS\/NZS 1972-compliant cables must show voltage as &#8220;6.35\/11kV&#8221; (not &#8220;6.6kV&#8221; or &#8220;6\/10kV&#8221;), conductor size in mm\u00b2, and the AS\/NZS standard number. Feichun Cable applies custom jacket printing to match your project&#8217;s exact inspection requirements, including bilingual (English\/Bahasa Indonesia) markings where required by local regulation.<\/p>\n\n    <p><strong>Production and Delivery Timeline:<\/strong> Feichun Cable&#8217;s standard production lead time for 6.35\/11kV 3\u00d7185mm\u00b2 mine feeder cables is ten to fourteen weeks from order confirmation, with delivery to Indonesian ports (Balikpapan, Banjarmasin, Pontianak, Samarinda) via direct shipping from Hefei through Shanghai or Ningbo. For urgent requirements, an accelerated production schedule of eight to ten weeks is available at a modest premium. We maintain strategic inventory of copper rod, XLPE compound, and SWA wire to buffer against raw material supply disruptions that frequently affect cable delivery schedules in the global mining industry.<\/p>\n\n    <p><strong>Technical Support and After-Sales Engineering:<\/strong> Feichun Cable provides comprehensive technical support for Kalimantan mining projects, including ampacity calculations customised for your actual installation conditions (soil thermal resistivity, ambient temperature profile, cable grouping, burial depth), cable sizing verification against your mine&#8217;s electrical load profile and fault level study, termination and jointing specifications compatible with your switchgear, and on-site installation supervision by our field engineering team if required. This technical support is included with every mine feeder cable order\u2014not billed separately\u2014because we have found that correct installation and application is the single most important factor in achieving the cable&#8217;s design life in tropical mining environments.<\/p>\n\n\n    <!-- ===== SECTION 12 ===== -->\n    <h2 id=\"s12\">12. Procurement Checklist and RFQ Guide<\/h2>\n\n    <div class=\"note green\">\n      <div class=\"nt\">Your RFQ Should Include the Following Information<\/div>\n\n      <p><strong>Step 1 \u2014 Correct Cable Designation:<\/strong> Specify &#8220;AS\/NZS 1972 Mine Feeder Cable, 6.35\/11kV, 3\u00d7185mm\u00b2 Cu\/XLPE\/CTS\/SWA\/PVC&#8221; (not &#8220;Type 2S 6.6kV&#8221;). If your project requires EPR insulation instead of XLPE (for enhanced flexibility at cable route bends), state this explicitly. If you require the cable to also comply with IEC 60502-2, state this as a secondary standard reference.<\/p>\n\n      <p><strong>Step 2 \u2014 Total Length and Delivery Format:<\/strong> State the total cable length required and preferred drum lengths (typically 500m or 1,000m per drum). Specify whether you require left-hand or right-hand drum winding (relevant for cable-laying equipment compatibility). For Kalimantan mine sites with limited crane capacity, consider requesting shorter drum lengths (250m) to reduce individual drum weight below 4,000 kg.<\/p>\n\n      <p><strong>Step 3 \u2014 Tropical Protection Requirements:<\/strong> Specify which tropical protection features are required: anti-termite outer sheath (recommended for all direct burial), enhanced UV stabilisation (recommended for exposed tray installation), water-blocking tape between cores (recommended for all installations in Kalimantan), bituminous armour protection (recommended for direct burial in corrosive or saline soils near coast). Each feature adds a defined cost; specifying requirements upfront prevents quote revisions and delays.<\/p>\n\n      <p><strong>Step 4 \u2014 Environmental Design Parameters:<\/strong> State your design ambient temperature (we recommend 40\u00b0C for Kalimantan cable tray, 30\u00b0C for buried cable soil temperature), expected soil thermal resistivity (if known from site testing), required minimum ampacity after derating, and any special installation conditions (vertical shaft installation, long horizontal pull distance, proximity to other circuits).<\/p>\n\n      <p><strong>Step 5 \u2014 Testing and Documentation Requirements:<\/strong> State which factory acceptance tests you require witnessed (typically routine tests per AS\/NZS 1972 plus partial discharge measurement), what language the test certificates and technical datasheets must be in (English, Bahasa Indonesia, or both), and whether you require independent third-party testing from an accredited laboratory (NATA, SAI Global, or equivalent Indonesian accreditation body such as KAN).<\/p>\n\n      <p><strong>Step 6 \u2014 Delivery Destination and Logistics:<\/strong> State the delivery port (Balikpapan, Banjarmasin, Pontianak, Samarinda, or other Kalimantan port) and whether you require delivery DAP mine site (including inland logistics) or CIF port. Kalimantan inland logistics from port to mine site can add significant cost and time; if your mine is remote, discuss logistics requirements with Feichun Cable&#8217;s shipping team to identify the most cost-effective delivery route.<\/p>\n\n      <p><strong>Step 7 \u2014 Commercial Terms:<\/strong> State your preferred payment terms, currency (USD, CNY, or IDR), Incoterms (FOB Ningbo, CIF Balikpapan, DAP mine site, etc.), and whether you require a performance bond or warranty certificate. Feichun Cable standard warranty for mine feeder cables is five years against manufacturing defects when installed in accordance with our installation guidelines.<\/p>\n    <\/div>\n\n\n    <!-- ===== CONCLUSION ===== -->\n    <h2 id=\"s13\">Conclusion: Correct Specification Prevents Costly Procurement Errors<\/h2>\n\n    <p>The single most important engineering action you can take for your Kalimantan mine feeder cable procurement is to correct the BOM designation from &#8220;Type 2S 6.6kV&#8221; to &#8220;Mine Feeder Cable, 6.35\/11kV.&#8221; This correction aligns the specification with AS\/NZS 1972&#8217;s actual classification system, ensures that cable manufacturers quote the correct product, and prevents inspection rejections on site. With this corrected specification and the ampacity data provided in this guide\u2014420 A at 40\u00b0C in free air, 370 A at 30\u00b0C direct burial in standard soil\u2014your electrical design team has the quantitative foundation needed to verify that 3\u00d7185mm\u00b2 is the correct conductor size for your mine&#8217;s load profile and installation environment.<\/p>\n\n    <p>Kalimantan&#8217;s tropical conditions\u2014persistent heat, extreme humidity, termite activity, intense UV radiation, and seasonal flooding\u2014demand cable specifications that go beyond temperate-climate defaults. Specifying the correct tropical protection features at the procurement stage costs five to ten percent more than a standard-specification cable but prevents premature failure modes that could cost fifty to one hundred times more in production losses and emergency replacement. Every dollar invested in correct specification at the procurement stage generates measurable returns in cable reliability over the fifteen to twenty-five year design life of a properly specified, properly installed mine feeder cable.<\/p>\n\n    <p class=\"cn\">\u52a0\u91cc\u66fc\u4e39\u77ff\u533a\u9988\u7ebf\u7535\u7f06\u91c7\u8d2d\u4e2d\u6700\u91cd\u8981\u7684\u5de5\u7a0b\u52a8\u4f5c\u662f\u5c06 BOM \u6807\u8bc6\u4ece&#8221;Type 2S 6.6kV&#8221;\u7ea0\u6b63\u4e3a&#8221;Mine Feeder Cable, 6.35\/11kV&#8221;\u3002\u7ed3\u5408\u672c\u6587\u63d0\u4f9b\u7684\u8f7d\u6d41\u91cf\u6570\u636e\u2014\u201440\u00b0C \u7a7a\u6c14\u4e2d 420A\u300130\u00b0C \u76f4\u57cb 370A\u2014\u2014\u60a8\u7684\u7535\u6c14\u8bbe\u8ba1\u56e2\u961f\u62e5\u6709\u4e86\u9a8c\u8bc1 3\u00d7185mm\u00b2 \u5bfc\u4f53\u89c4\u683c\u7684\u5b8c\u6574\u6280\u672f\u57fa\u7840\u3002\u5728\u91c7\u8d2d\u9636\u6bb5\u6295\u5165\u6b63\u786e\u7684\u70ed\u5e26\u9632\u62a4\u63aa\u65bd\uff08\u989d\u5916 5-10% \u6210\u672c\uff09\u53ef\u907f\u514d\u8fd0\u8425\u4e2d\u9ad8\u8fbe 50-100 \u500d\u7684\u6545\u969c\u635f\u5931\u3002<\/p>\n\n  <\/div>\n\n  <div class=\"contact\">\n    <h3>Contact Anhui Feichun Special Cable Co., Ltd. \u2014 Mine Feeder Cable Specialists<\/h3>\n    <div class=\"cg\">\n      <div class=\"ci\">\n        <span class=\"lb\">Technical Engineering &#038; BOM Review<\/span>\n        <a href=\"mailto:tech@feichuncables.com\">tech@feichuncables.com<\/a>\n      <\/div>\n      <div class=\"ci\">\n        <span class=\"lb\">Indonesia &#038; Southeast Asia Sales<\/span>\n        <a href=\"mailto:mining@feichuncables.com\">mining@feichuncables.com<\/a>\n      <\/div>\n      <div class=\"ci\">\n        <span class=\"lb\">AS\/NZS Compliance &#038; Documentation<\/span>\n        <a href=\"mailto:sales@feichuncables.com\">sales@feichuncables.com<\/a>\n      <\/div>\n      <div class=\"ci\">\n        <span class=\"lb\">Emergency Support \u2014 WhatsApp\/WeChat<\/span>\n        <a href=\"https:\/\/wa.me\/8613855123218\" target=\"_blank\" rel=\"noopener\">+86 138-5512-3218<\/a>\n      <\/div>\n    <\/div>\n  <\/div>\n\n  <footer class=\"ft\">\n    <p>&copy; 2026 Anhui Feichun Special Cable Co., Ltd. \u2014 All rights reserved.<\/p>\n    <p>Building A, Private Science &#038; Technology Park, Hefei Economic and Technological Development Zone, Anhui Province, China.<\/p>\n  <\/footer>\n\n<\/article>\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"If you are an electrical engineer reviewing a Bill of Materials for a Kalimantan mining project and the BOM line reads &#8220;AS\/NZS 1972 Type 2S 6.6kV 3\u00d7185mm\u00b2 Armoured Cable,&#8221; the cable you actually need is an AS\/NZS 1972 Mine Feeder Cable rated 6.35\/11kV, with 3\u00d7185mm\u00b2 copper conductors, XLPE or EPR insulation, copper tape screen, and galvanised steel wire armour (SWA). The &#8220;Type 2S&#8221; designation on your BOM is technically incorrect for this voltage class\u2014a point we will clarify in detail below\u2014but the intent behind the specification is clear: a heavy-duty, armoured, medium-voltage power cable for primary distribution in an underground or open-pit mine.\n\u5982\u679c\u60a8\u662f\u4e00\u540d\u5ba1\u67e5\u52a0\u91cc\u66fc\u4e39\u77ff\u533a\u7269\u6599\u6e05\u5355\uff08BOM\uff09\u7684\u7535\u6c14\u5de5\u7a0b\u5e08\uff0cBOM \u4e0a\u5199\u7740&#8221;AS\/NZS 1972 Type 2S 6.6kV 3\u00d7185mm\u00b2 \u94e0\u88c5\u7535\u7f06&#8221;\uff0c\u60a8\u5b9e\u9645\u9700\u8981\u7684\u662f AS\/NZS 1972 \u77ff\u7528\u9988\u7ebf\u7535\u7f06\uff0c\u989d\u5b9a 6.35\/11kV\uff0c3\u00d7185mm\u00b2 \u94dc\u5bfc\u4f53\uff0cXLPE \u6216 EPR \u7edd\u7f18\uff0c\u94dc\u5e26\u5c4f\u853d\uff0c\u9540\u950c\u94a2\u4e1d\u94e0\u88c5\uff08SWA\uff09\u3002BOM \u4e0a\u7684&#8221;Type 2S&#8221;\u6807\u8bc6\u5728\u6b64\u7535\u538b\u7b49\u7ea7\u4e0b\u6280\u672f\u4e0a\u4e0d\u6b63\u786e\u2014\u2014\u6211\u4eec\u5c06\u5728\u4e0b\u6587\u8be6\u7ec6\u8bf4\u660e\u2014\u2014\u4f46\u89c4\u683c\u7684\u610f\u56fe\u662f\u660e\u786e\u7684\uff1a\u7528\u4e8e\u77ff\u4e95\u4e3b\u5e72\u914d\u7535\u7684\u91cd\u578b\u94e0\u88c5\u4e2d\u538b\u7535\u529b\u7535\u7f06\u3002\nThe ampacity you should design around at 40\u00b0C ambient air temperature in Kalimantan is approximately 420 amperes for cable tray or free-air installation, and approximately 370 amperes for direct burial in tropical soil at 30\u00b0C ground temperature. These figures are derated from the standard 30\u00b0C base-case ampacity of approximately 460 A (air) and the 20\u00b0C base-case of approximately 400 A (ground), using the thermal derating methodology prescribed in AS\/NZS 3008.1.1 and IEC 60502-2. The full derivation, including the governing equations and correction factors for Kalimantan&#8217;s specific environmental conditions, follows in Sections 6 and 7.","protected":false},"author":1,"featured_media":8709,"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":[222,66],"tags":[46944,46945,9631,46943,46949,46146,46942,46951,22776,46954,44850,1617,46905,33560,6539,9655,45888,10656,39614,46937,4862,3726,152,44312,27265,32123,46930,45586,1844,46947,46950,1092,2441,25333,46907,10643,44308,46953,46902,46952,20711,46263,46946,2790,46948,46955,3951,40434,2930,9715],"class_list":["post-8705","post","type-post","status-publish","format-standard","has-post-thumbnail","category-as-nzs-1802-reeling-cables-for-underground-mining","category-common-problems-encountered-in-cable-applications","tag-3x185mm2-swa-cable","tag-40c-ambient-cable-derating","tag-6-35-11kv-xlpe-cable","tag-6-6kv-armoured-cable","tag-as-3008-ampacity","tag-as-nzs-1972-cable","tag-as-nzs-1972-mine-feeder-cable","tag-awg-350-mcm-cable","tag-bore-hole-cable","tag-bulk-terminal-cable","tag-cable-ampacity-chart","tag-cable-bending-radius","tag-cable-rfq","tag-cable-trench-installation","tag-cable-voltage-drop-calculation","tag-copper-tape-screen-cable","tag-cu-weight-kg-km-2","tag-direct-burial-mv-cable","tag-dynamic-tensile-load","tag-electrical-engineer-bom","tag-epr-insulated-armoured-cable","tag-flame-retardant-mining-cable-2","tag-heavy-duty-mining-cable","tag-heavy-lifting-equipment-cable","tag-high-humidity-mine-cable","tag-iec-60502-2-equivalent","tag-indonesian-mining-electrification","tag-industrial-cable-procurement","tag-international-cable-standard","tag-kalimantan-mining-cable","tag-main-feeder-cable","tag-material-handling-cable","tag-mechanical-stress-cable","tag-medium-voltage-feeder-cable","tag-mining-equipment-bom","tag-mv-cable-specifications","tag-oem-cable-manufacturing","tag-open-pit-mine-power-supply","tag-outer-diameter-cable","tag-short-circuit-current-185mm2","tag-soil-thermal-resistivity","tag-steel-wire-armoured-mining-cable","tag-swa-pvc-cable","tag-tinned-copper-conductor","tag-tropical-environment-cable-ampacity","tag-tropicalization-cable","tag-underground-coal-mine-cable","tag-uv-resistant-cable-sheath","tag-vde-0250-equivalent","tag-water-blocking-cable-2","cs-entry"],"_links":{"self":[{"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/posts\/8705","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=8705"}],"version-history":[{"count":2,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/posts\/8705\/revisions"}],"predecessor-version":[{"id":8711,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/posts\/8705\/revisions\/8711"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/media\/8709"}],"wp:attachment":[{"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/media?parent=8705"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/categories?post=8705"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/tags?post=8705"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}