BTTZ, whose full name is "Copper Conductor, Copper Sheath, Magnesium Oxide Insulated, Heavy-Duty Fire-Resistant Cable," is the most classic and strictest "fire-resistant cable" in the mineral insulated cable family—it adopts a fully inorganic structure of solid copper rod conductor + magnesium oxide (MgO) powder insulation + seamless copper tube sheath, and is widely recognized both domestically and internationally as a truly non-combustible cable. BTTZ is the representative model of rigid mineral insulated cables, standing in stark contrast to later flexible mineral insulated cables (YTTW, BTLY, BBTRZ, etc.), and holds an irreplaceable position in critical fire protection circuits, extreme high-temperature environments, and high-impact conditions.
Implementation Standards
BTTZ is one of the few mineral insulated cable products in China with complete national standards:
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GB/T 13033.1-2007 "Mineral Insulated Cables and Their Terminations with a Rated Voltage of 750V and Below – Part 1: Cables"
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GB/T 13033.2-2007 Termination Requirements
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IEC 60702-1:2002 "Mineral Insulated Cables and Their Terminations with a Rated Voltage Not Exceeding 750V"
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GB/T 19216.11-2003 "Tests for Circuit Integrity of Cables or Optical Fiber Cables Under Fire Conditions"
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BS 6387:2013 "Method for Assessment of Fire Resistance of Cables Required to Maintain Circuit Integrity Under Fire Conditions" (C/W/Z three-tier assessment)
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BS 8491, BS 8434-2, BS 5266, BS 8519 and other British standard series
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GB 31247-2014 "Classification of Burning Behavior for Cables and Optical Fiber Cables" (Class A)
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GB 50016-2014 "Code for Fire Protection Design of Buildings" (mandatory requirements for fire protection power distribution circuits)
