The fire-resistant advantages of BTTZ cable are primarily reflected in its materials, structure, and performance.
BTTZ cable, short for heavy-duty copper core, copper sheathed magnesium oxide mineral insulated cable, is a classic type of rigid mineral insulated cable (MI cable). Its structure resembles a "steel armor," consisting of three layers from the inside out:
Conductor: High-purity annealed copper core, offering strong conductivity and stability.
Insulation: Dense magnesium oxide powder with a melting point of 2800°C, which does not decompose or burn in flames.
Sheath: Seamless copper tube sheath, providing both mechanical protection and grounding.
This inorganic combination of "metal + mineral" eliminates the flammability of traditional plastic cables, making it a reliable "protector" of power in extreme environments.
BTTZ Cable Performance Advantages:
1. Supreme Fire Resistance
Passing the international standard BS 6387 C-W-Z test (950°C flame + water spray + mechanical impact), it ensures continuous power supply during fires, far exceeding the 90-minute limit of ordinary fire-resistant cables.
2. High-Temperature and Radiation-Resistant
With an operating temperature of up to 250°C and a short-term resistance to 1083°C (copper melting point), it is suitable for high-temperature radiation environments such as nuclear power plants and steel mills.
3. Explosion-Proof and Corrosion-Resistant
The copper sheath is seamlessly sealed, waterproof, oil-proof, and chemically resistant, allowing it to be buried directly underground or exposed to humid and explosive atmospheres.
4. Ultra-Long Life and Environmental Protection
The inorganic material eliminates the risk of aging and boasts a lifespan exceeding 100 years. It is 100% recyclable after disposal, ensuring zero pollution.
BTTZ Cable Application Scenarios:
1. Lifeline Projects
Main power lines for systems such as fire pumps, smoke exhaust fans, and emergency lighting, ensuring continuous operation of critical equipment during fires.
2. High-risk Locations
Petrochemical, aerospace, nuclear facilities, and other fields with stringent fire and explosion protection requirements.
3. Super-high-rise buildings
Such as the Shanghai Tower and the Burj Khalifa in Dubai, vertical trunk lines utilize BTTZ cables to mitigate the risk of the "chimney effect."
4. Rail Transit
Ensure train signaling systems and emergency evacuation power in the high-temperature, humid environment of subway tunnels.
BTTZ Cable Installation Requirements:
Professional Construction: Use hydraulic equipment to cut the copper sheath and fill it with a special sealant to prevent moisture absorption by the magnesium oxide.
Bending Limits: The minimum bend radius is six times the cable diameter. Excessive bending can easily cause the insulation layer to crack.
Grounding Requirements: Both ends of the copper sheath must be reliably grounded to prevent induced voltage accumulation.
