What is BTTQ/BTTYQ – Flame-Retardant mineral insulated Power Cable?

Chinese Name: BTTQ/BTTYQ Flexible Mineral Insulated Fire-Resistant Cable

1. BTTQ/BTTYQ: Model representation method for flexible mineral insulated fire-resistant cable
2. B: Wiring cable
3. T: Copper conductor
4. T: Copper sheath
5. Q: Light PVC outer sheath
6. YQ: Light PE outer sheath

Specific Types and Models

The BTTQ/BTTYQ flexible mineral insulated fire-resistant cable models mainly include the following:

Working Principle

The working principle of BTTQ/BTTYQ flexible mineral insulated fire-resistant cable is based on the basic characteristics of mineral insulated cables:

1. Mineral Insulation Principle: Using magnesium oxide as the insulating material. Magnesium oxide is an inorganic mineral with non-flammable, high-temperature resistance, and excellent insulation properties.
2. Copper Conductor Transmission: High-purity copper conductors are used to ensure excellent conductivity.
3. Copper Sheath Protection: Seamless copper tube as the sheath provides mechanical protection and shielding.
4. Outer Sheath Protection: Q or YQ light outer sheath provides additional protection, improving the cable’s moisture and corrosion resistance.

In case of fire, BTTQ/BTTYQ cables can maintain normal operation because:

1. Magnesium oxide insulating material does not burn or melt at high temperatures.
2. Copper sheath can withstand high temperatures and maintain structural integrity.
3. Cable structure design ensures power and signal transmission even in flames.

Technical Parameters

Electrical Parameters

Fire Resistance Performance Parameters

Current Carrying Capacity Parameters

Current carrying capacity of BTTQ/BTTYQ cables under different installation conditions (ambient temperature 25°C):

Advantages and Disadvantages

Advantages

1. Excellent Fire Resistance: Can maintain normal operation for more than 3 hours in high-temperature flames of 950°C-1000°C, one of the highest fire-resistant cables currently available.
2. Non-toxic and Environmentally Friendly: Does not produce toxic or harmful gases when burned, meeting environmental requirements.
3. Long Service Life: Mineral insulating materials have stable performance, with a service life of up to 70 years or more.
4. High Mechanical Strength: Metal sheath provides good mechanical protection, resistant to impact and tensile forces.
5. Good Shielding Performance: Copper sheath can serve as a shielding layer, effectively reducing electromagnetic interference.
6. High Current Carrying Capacity: Higher current carrying capacity than ordinary cables for the same cross-section.
7. Waterproof and Moisture-Proof: Fully sealed structure, excellent waterproof and moisture-proof performance.

Disadvantages

1. Higher Price: Due to high material and process requirements, the price is higher than ordinary cables.
2. Heavier Weight: The copper sheath and mineral insulating materials make the cable heavier.
3. Difficult Installation: Requires professional installation equipment and technology.
4. Larger Bending Radius: Although flexible, the bending radius is still larger than ordinary cables.