Types of Mineral Insulated Cables

With so many cables on the market, how can it be called a real fireproof insulated cable, Mineral Insulated Cable, or MI cable for short. At present, according to the structural characteristics, it can be divided into two types: rigid and flexible. Due to the defects in reliability, production and laying of rigid mineral insulated cables, they have been gradually withdrawn from the market in developed countries in Europe and the United States, and the power of mineral insulated flexible high temperature cable have become the mainstream cable products in the field of fire protection. The power of mineral insulated flexible high temperature cable (BBTZ) is composed of stranded copper wire, mineral compound insulation, and mineral compound sheath. This cable is non-flammable, smoke-free, non-toxic and fire-resistant.

Structure characteristics of Mineral Insulated Flexible High Temperature Cable

The structure of mineral insulated flexible high temperature cable adopts a flexible structure, and the main materials are mineral compounds, which make up for the defects of hard structure, flammability, toxicity, etc. It also has some advantages that other cables cannot have, such as: fire resistance, large current carrying capacity, resistance to Impulse voltage, resistance to mechanical damage, halogen-free, non-toxic, explosion-proof, waterproof, corrosion-resistant, long life, safety, overload resistance, high temperature resistance, low cost, etc.

The Power of Mineral Insulated Flexible High Temperature Cable

  1. Excellent fire performance, the fire rating not only meets the national standard GB1266.6: Class A 950°C 90min, but also conforms to the British standard BS187-1994: Class A 650°C 3h: Class B 750°C 3h; Class C 950°C 3h, but also Withstand water spray or mechanical shock;
  2. Long continuous length: whether it is a single-core or multi-core cable, this length can meet the length requirements of the power supply, and the continuous length of each cable can reach 1000m.
  3. The cross-sectional area is large, the cross-sectional area of ​​the single-core cable reaches 630mm2, and the cross-sectional area of ​​the multi-core cable reaches 70mm2.
  4. Flexibility, themineral insulated flexible high temperature cable can be wound on a cable reel with a bending radius of 6-10D, (D is the outer diameter of the cable):
  5. It is smoke-free and non-toxic when burning. It adopts inorganic materials (non-flammable materials) for heat preservation, and burning will not produce any harmful gas or secondary pollution. It is an environmentally friendly product;
  6. Strong overload capacity, the cable not only has high current-carrying capacity, but also has large overload capacity. Depending on the wiring requirements, the surface temperature of the cable is usually 70°C, and the cable jacket temperature can be increased to 105°C if there is no contact or contact with flammable building materials. In case of overload, the long-term working temperature of the fireproof cable can reach 250℃; 

Because the general wire and cable are made of organic polymer materials for insulation, they are easily carbonized under flame conditions and lose their insulating effect. Since the main materials of mineral insulated flexible high temperature cable(BBTRZ) are all composed of mineral compounds, it will not cause fire by itself, and it is impossible to burn or support combustion. These materials generally have a high melting point above 1500°C, so the fireproof cable can play a normal power transmission function even under flame conditions, and it is a real fireproof cable.