BTTZ (Mineral-Insulated Fire-Resistant Cable (MI Cable))

Operating Characteristics

• Non-combustible or fire-resistant: This type of cable can continue to supply power even under fire conditions approaching the melting point of copper, making it a truly fire-resistant cable. It complies with BS 6387 C, W, Z tests.

• High current-carrying capacity and waterproof: The actual normal operating temperature of mineral-insulated cables can reach 250°C. According to IEC 60702, the continuous operating temperature is specified as 105°C, considering terminal sealing materials and safety requirements. Even so, its current-carrying capacity far exceeds that of other cables because mineral insulation has a better thermal conductivity than plastic, allowing higher current for the same operating temperature.

• Explosion-proof and corrosion-resistant:

  • Explosion-proof: The metal sheath serves as a protective layer, preventing flammable gases, oil vapors, or flames from reaching connected electrical equipment, giving the cable explosion-proof characteristics.

  • Corrosion resistance: Copper has good corrosion resistance, so in normal environments no additional protection is required. In special environmental conditions, an additional outer sheath can be applied for enhanced corrosion resistance.

• Mechanical damage resistance, long service life, halogen-free and non-toxic: Even when exposed to 1000°C, it does not produce smoke, halogens, or toxic gases, making it a truly halogen-free and non-toxic cable.

• Overload resistance and copper sheath as grounding conductor:

  • Overload resistance: With a copper melting point of 1083°C and mineral insulation melting above 1000°C, the current-carrying capacity of mineral-insulated cables can be increased by one cross-section rating compared to ordinary plastic cables, and can withstand overloads up to 10 times the normal current rating.

  • Copper sheath as grounding: The continuity of the copper sheath and its very low ground resistance allow it to serve as a grounding conductor, eliminating the need for a separate ground wire.