{"id":260,"date":"2026-09-07T00:39:15","date_gmt":"2026-09-07T00:39:15","guid":{"rendered":"https:\/\/luliancable.com\/?p=260"},"modified":"2026-10-19T02:34:54","modified_gmt":"2026-10-19T02:34:54","slug":"bttz-btly-bbtrz-fire-resistant-cable","status":"publish","type":"page","link":"https:\/\/luliancable.com\/ar\/products\/mineral-insulated-fire-resistant-cable\/bttz-btly-bbtrz-fire-resistant-cable\/","title":{"rendered":"BTTZ\/BTLY\/BBTRZ Fire-Resistant Cable"},"content":{"rendered":"\n\n<style>\n.lllv{--red:#E30613;--ink:#101720;--mut:#5b6673;--line:#e2e6ea;--soft:#f4f6f8;color:var(--ink);line-height:1.6}\n.lllv *{box-sizing:border-box}\n.lllv h2{font-size:26px;line-height:1.2;margin:0 0 10px;color:var(--ink)}\n.lllv h3{font-size:17px;margin:0 0 8px;color:var(--ink)}\n.lllv p{margin:0 0 12px}\n.lllv .k{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--red);font-weight:700;margin-bottom:8px}\n.lllv .wrap{max-width:1180px;margin:0 auto;padding:0 24px}\n.lllv .hero{background:linear-gradient(135deg,#101720 0%,#1d2836 100%);color:#fff;padding:52px 0}\n.lllv .hero h1{color:#fff;font-size:36px;line-height:1.15;margin:0 0 14px}\n.lllv .hero .hgrid{display:grid;grid-template-columns:1.35fr .85fr;gap:32px;align-items:start}\n.lllv .hero .hshot{background: var(--lu-card);padding:12px;border-radius:10px;margin:0;box-shadow:0 10px 28px rgba(0,0,0,.35)}\n.lllv .hero .hshot img{display:block;width:100%;height:auto;border-radius:6px}\n.lllv .hero .hshot figcaption{font-size:12px;color: #8E98A4;padding:8px 4px 2px;letter-spacing:.02em}\n@media(max-width:860px){.lllv .hero .hgrid{grid-template-columns:1fr}.lllv .hero .hshot{max-width:420px}}\n.lllv .hero p{color:#c9d2dc;max-width:64ch}\n.lllv .chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}\n.lllv .chip{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.25);color:#fff;padding:5px 12px;border-radius:999px;font-size:13px}\n.lllv .sec{padding:42px 0;border-bottom:1px solid var(--line)}\n.lllv table{width:100%;border-collapse:collapse;font-size:14px;background: var(--lu-card)}\n.lllv th,.lllv td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}\n.lllv th{background:var(--soft);font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--mut)}\n.lllv .badges{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}\n.lllv .badge{border:1px solid var(--line);background: var(--lu-card);padding:6px 12px;border-radius:999px;font-size:13px}\n.lllv .badge.red{background:var(--red);color:#fff;border-color:var(--red)}\n.lllv .grid2{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:start}\n.lllv .grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}\n.lllv .card{border:1px solid var(--line);background: var(--lu-card);padding:18px}\n.lllv .num{color:var(--red);font-weight:700;font-size:13px}\n.lllv figure{margin:0;border:1px solid var(--line);background: var(--lu-card)}\n.lllv figure img{width:100%;height:auto;display:block}\n.lllv figcaption{font-size:12px;color:var(--mut);padding:8px 12px;border-top:1px solid var(--line)}\n.lllv .note{font-size:13px;color:var(--mut);margin-top:10px}\n.lllv details{border:1px solid var(--line);background: var(--lu-card);margin-bottom:10px;padding:0}\n.lllv summary{cursor:pointer;padding:14px 18px;font-weight:700;list-style:none}\n.lllv summary::-webkit-details-marker{display:none}\n.lllv summary:after{content:\"+\";float:right;color:var(--red);font-size:20px}\n.lllv details[open] summary:after{content:\"\u2212\"}\n.lllv details .a{padding:0 18px 16px}\n.lllv .rfq{background:#101720;color:#fff;padding:34px;border-radius:8px;margin:40px 0;display:grid;grid-template-columns:1.4fr 1fr;gap:24px}\n.lllv .rfq h2{color:#fff}\n.lllv .rfq .btn{display:inline-block;background:var(--red);color:#fff;padding:12px 20px;text-decoration:none;font-weight:700;border-radius:6px;margin-right:10px}\n.lllv .rfq .btn.g{background:transparent;border:1px solid #46536a}\n.lllv .rel{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:14px}\n.lllv .rel a{display:block;border:1px solid var(--line);background: var(--lu-card);padding:14px;text-decoration:none;color:var(--ink)}\n.lllv .rel a:hover{border-color:var(--red)}\n.lllv .rel .t{font-size:11px;letter-spacing:.1em;color:var(--red);text-transform:uppercase}\n@media(max-width:900px){.lllv .grid2,.lllv .grid3,.lllv .rfq{grid-template-columns:1fr}.lllv .rel{grid-template-columns:repeat(2,1fr)}}\n@media(max-width:560px){.lllv .hero h1{font-size:27px}.lllv .rel{grid-template-columns:1fr}}\n<\/style>\n<div class=\"lllv\">\n  <div class=\"hero\"><div class=\"wrap\"><div class=\"hgrid\"><div class=\"htxt\">\n    <p class=\"k\" style=\"color:#e8b0a5\">FIRE-RESISTANT &amp; MINERAL INSULATED \u00b7 BTTZ \/ BTLY \/ BBTRZ \u00b7 IEC 60331<\/p>\n    <h1>Mineral Insulated &amp; Fire-Resistant Cable \u2014 power that survives the fire.<\/h1>\n    <p>Mineral-insulated and flexible fire-resistant cable for life-safety circuits: fire pumps, smoke extraction, emergency lighting and fire-alarm power. Circuit integrity verified against IEC 60331 and BS 6387.<\/p>\n    <div class=\"chips\"><span class=\"chip\">BTTZ rigid MI<\/span><span class=\"chip\">BTLY flexible MI<\/span><span class=\"chip\">BBTRZ LSZH fire-resistant<\/span><span class=\"chip\">750 V class<\/span><span class=\"chip\">950 \u00b0C \/ 3 h rated<\/span><\/div>\n    <\/div>\n    <figure class=\"hshot\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/luliancable.com\/wp-content\/uploads\/2026\/09\/lulian-bttz-mineral-insulated-clean.jpg\" alt=\"BTTZ rigid mineral-insulated fire-resistant cable with copper sheath - Lulian Cable product view\" loading=\"eager\" width=\"1600\" height=\"1600\"><figcaption>BTTZ rigid mineral-insulated cable &#8211; product view<\/figcaption><\/figure>\n    <\/div>\n  <\/div><\/div>\n\n  <div class=\"sec\"><div class=\"wrap\">\n    <p class=\"k\">\u00a701 \u2014 Three constructions<\/p>\n    <h2>Rigid, flexible, and LSZH \u2014 three ways to keep the circuit alive.<\/h2>\n    <table>\n      <tr><th>Type<\/th><th>Construction<\/th><th>Character<\/th><th>Typical use<\/th><\/tr>\n      <tr><td><strong>BTTZ<\/strong><\/td><td>Copper conductors, compressed MgO insulation, seamless copper sheath<\/td><td>Rigid MI cable; fully inorganic \u2014 nothing to burn<\/td><td>Fire pumps, smoke extraction fans, highest-integrity circuits<\/td><\/tr>\n      <tr><td><strong>BTLY (NG-A)<\/strong><\/td><td>Copper conductors, mineral composite insulation, corrugated copper sheath<\/td><td>Flexible MI; much easier to install than rigid BTTZ<\/td><td>Emergency power risers in high-rise buildings<\/td><\/tr>\n      <tr><td><strong>BBTRZ<\/strong><\/td><td>Mineral-insulated core with LSZH outer covering<\/td><td>Flexible, low-smoke halogen-free fire-resistant<\/td><td>Tunnels, metros, hospitals \u2014 fire + smoke requirements together<\/td><\/tr>\n    <\/table>\n    <div class=\"grid2\" style=\"margin-top:18px\">\n      <figure><img decoding=\"async\" src=\"https:\/\/luliancable.com\/wp-content\/uploads\/2026\/09\/lulian-mineral-insulated-cable.jpg\" alt=\"Mineral insulated fire-resistant cable: smooth copper sheath BTTZ type and corrugated sheath BTLY type\" width=\"2048\" height=\"2048\"><figcaption>BTTZ &amp; BTLY mineral insulated cable \u00b7 factory photo<\/figcaption><\/figure>\n      <div class=\"card\"><div class=\"num\">PATENTED<\/div><h3>Own mineral-insulated patent<\/h3><p>Our mineral-insulated cable design is covered by a Chinese utility-model patent held by Shandong Lulian Cable \u2014 one of seven patents across fire-resistant, irradiated and mineral-insulated constructions.<\/p><p class=\"note\">Patent certificate shared with the formal offer.<\/p><\/div>\n    <\/div>\n  <\/div><\/div>\n\n  <div class=\"sec\"><div class=\"wrap\">\n    <p class=\"k\">\u00a702 \u2014 Fire performance<\/p>\n    <h2>What &#8220;fire-resistant&#8221; actually means on the test bench.<\/h2>\n    <table>\n      <tr><th>Rating<\/th><th>Standard<\/th><th>What it proves<\/th><\/tr>\n      <tr><td>Circuit integrity in fire<\/td><td>IEC 60331-21<\/td><td>Cable keeps working at 750 \u00b0C flame for 90 minutes minimum<\/td><\/tr>\n      <tr><td>Fire + water + mechanical shock<\/td><td>BS 6387 C \/ W \/ Z<\/td><td>650 \u00b0C fire, then water spray, then impact \u2014 circuit stays alive<\/td><\/tr>\n      <tr><td>Flame retardance<\/td><td>IEC 60332-1 \/ -3<\/td><td>No flame propagation along the cable run<\/td><\/tr>\n      <tr><td>Smoke &amp; halogen (BBTRZ)<\/td><td>IEC 61034 \/ IEC 60754<\/td><td>Low smoke, no corrosive halogen gas in escape routes<\/td><\/tr>\n      <tr><td>BTTZ construction<\/td><td>GB\/T 13033 \u00b7 BS EN 60702-1<\/td><td>Mineral insulated cable dimensional and electrical conformity<\/td><\/tr>\n    <\/table>\n    <p class=\"note\">MI cable rating: 950 \u00b0C \/ 180 min survival is the reference class for BTTZ construction; exact rating confirmed per construction with the formal offer.<\/p>\n  <\/div><\/div>\n\n  <div class=\"sec\"><div class=\"wrap\"><p class=\"k\">PRODUCT VIEWS<\/p><h2>The range at a glance.<\/h2><div class=\"llgal\"><figure><img decoding=\"async\" src=\"https:\/\/luliancable.com\/wp-content\/uploads\/2026\/09\/mineral-insulated-fire-resistant-cable-9.jpg\" alt=\"Fire-resistant cable cutaway product view - Lulian Cable\" loading=\"lazy\" width=\"2048\" height=\"2048\"><figcaption>Flexible fire-resistant cable, cutaway view.<\/figcaption><\/figure><figure><img decoding=\"async\" src=\"https:\/\/luliancable.com\/wp-content\/uploads\/2026\/09\/mineral-insulated-fire-resistant-cable-8.jpg\" alt=\"Fire-resistant cable layered construction - Lulian Cable\" loading=\"lazy\" width=\"2048\" height=\"2048\"><figcaption>Layered construction of the fire-resistant build.<\/figcaption><\/figure><figure><img decoding=\"async\" src=\"https:\/\/luliancable.com\/wp-content\/uploads\/2026\/09\/mineral-insulated-fire-resistant-cable-11.jpg\" alt=\"Fire-resistant cable construction range comparison - Lulian Cable\" loading=\"lazy\" width=\"2048\" height=\"2048\"><figcaption>BTTZ rigid MI vs BTLY flexible MI vs BBTRZ.<\/figcaption><\/figure><\/div><\/div><\/div>\n\n<div class=\"sec\"><div class=\"wrap\">\n    <p class=\"k\">\u00a703 \u2014 FAQ<\/p>\n    <h2>Common questions on fire-resistant cable.<\/h2>\n    <details><summary>Fire-resistant vs flame-retardant \u2014 what is the difference?<\/summary><div class=\"a\"><p>Flame-retardant (ZR) cable resists catching fire and stops flames spreading \u2014 but it is not expected to keep working during a fire. Fire-resistant (NH \/ MI) cable keeps the circuit alive during the fire itself, typically 90\u2013180 minutes at 750\u2013950 \u00b0C. Life-safety circuits (fire pumps, smoke extraction, emergency lighting) need fire-resistant; general power circuits in escape routes need flame-retardant + LSZH.<\/p><\/div><\/details>\n    <details><summary>BTTZ vs BTLY \u2014 which one should we specify?<\/summary><div class=\"a\"><p>BTTZ is the absolute top tier: fully inorganic, seamless copper sheath, the highest fire integrity \u2014 but rigid, harder to install and needs special terminations. BTLY (corrugated sheath) gives near-equivalent fire performance with far easier installation and longer factory lengths. Most high-rise emergency risers today specify BTLY\/BBTRZ for this reason.<\/p><\/div><\/details>\n    <details><summary>What sizes and voltages are available?<\/summary><div class=\"a\"><p>Rated 750 V (BTTZ class). Single core to 400 mm\u00b2, multi-core 1.5\u201325 mm\u00b2 typical; flexible types up to 4\u00d795 mm\u00b2 and beyond on request. Confirm the fire pump \/ fan load schedule with the RFQ and we size the cross-section.<\/p><\/div><\/details>\n    <details><summary>Can fire-resistant cable be supplied with third-party witnessed tests?<\/summary><div class=\"a\"><p>Yes \u2014 SGS \/ BV \/ Intertek witnessed fire tests are arranged for project orders, and the routine test report ships with every drum.<\/p><\/div><\/details>\n  <\/div><\/div>\n\n  <div class=\"sec\"><div class=\"wrap\">\n    <div class=\"rfq\">\n      <div>\n        <h2>Send the cable schedule. We confirm in 24 hours.<\/h2>\n        <p style=\"color:#c9d2dc\">Share type, cross-section, core count, installation method, total length and destination port.<\/p>\n        <p><a class=\"btn\" href=\"mailto:sales@luliancable.com?subject=Fire%20resistant%20cable%20RFQ\">Email RFQ \u2192 sales@luliancable.com<\/a><a class=\"btn g\" href=\"\/contact\/\">Open RFQ form<\/a><\/p>\n      <\/div>\n      <div><\/div>\n    <\/div>\n    <p class=\"k\">Related<\/p>\n    <div class=\"rel\"><a href=\"\/products\/mineral-insulated-fire-resistant-cable\/\"><div class=\"t\">Category<\/div><strong>Fire-Resistant Cable<\/strong><\/a>\n      <a href=\"\/products\/control-cable\/lszh-control-cable\/\"><div class=\"t\">Product<\/div><strong>LSZH Control Cable<\/strong><\/a>\n      <a href=\"\/flame-retardant-vs-fire-resistant-cable\/\"><div class=\"t\">Guide<\/div><strong>ZR vs NH Explained<\/strong><\/a>\n      <a href=\"\/what-is-mineral-insulated-cable\/\"><div class=\"t\">Guide<\/div><strong>What Is MI Cable<\/strong><\/a><\/div>\n  <\/div><\/div>\n<\/div>\n\n\n\n<div class=\"rfq-head\" style=\"max-width:1240px;margin:0 auto;padding:0 24px\"><p style=\"font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:#EA382F;font-weight:800;margin:0 0 8px\">Send an enquiry<\/p><h2 style=\"color:#fff;font-size:clamp(22px,2.4vw,30px);line-height:1.2;margin:0 0 4px\">Request a quote<\/h2><p style=\"color:#9A9A9A;font-size:15px;margin:0 0 20px\">Three fields. 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Fire-resistant (NH \/ MI) cable keeps the circuit alive during the fire itself, typically 90\u2013180 minutes at 750\u2013950 \u00b0C. Life-safety circuits (fire pumps, smoke extraction, emergency lighting) need fire-resistant; general power circuits in escape routes need flame-retardant + LSZH.\"}},{\"@type\":\"Question\",\"name\":\"BTTZ vs BTLY \u2014 which one should we specify?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"BTTZ is the absolute top tier: fully inorganic, seamless copper sheath, the highest fire integrity \u2014 but rigid, harder to install and needs special terminations. BTLY (corrugated sheath) gives near-equivalent fire performance with far easier installation and longer factory lengths. Most high-rise emergency risers today specify BTLY\/BBTRZ for this reason.\"}},{\"@type\":\"Question\",\"name\":\"What sizes and voltages are available?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Rated 750 V (BTTZ class). 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