What is the Difference Between Fire Resistive Cable and Mineral Insulated Cable?

1. The difference between the composition and structure of fire resistive cable and mineral insulated cable

Mineral insulated cable: It is composed of inorganic materials, non-flammable, and does not produce harmful gases. When a fire occurs, smoke and poisonous gases are the most deadly, which is one of the biggest advantages of mineral insulated cables. It can be used for a long time under the working environment of 250℃ and can work continuously for 3 hours under the working environment of 950-1000℃. GB/T16895.15-2002 stipulates that the working temperature of mineral insulated cables reaches 105℃. Fire resistive cable: It is composed of insulating materials, low halogen and low smoke themselves are not included in the assessment. In the event of a fire, it can maintain operation for a certain time, that is, maintain the integrity of the circuit and have power supply capability for a certain time. The working temperature of the fire resistive cable can reach 90℃ under special conditions, and it can work continuously for half an hour under the working environment of 950-1000℃.

2. The difference between the power supply capacity of fire resistive cable and mineral insulated cable

In terms of power supply capacity of mineral insulated cable: The interception capacity is larger than that of refractory cable, which is equivalent to 1-3 interception surfaces less than that of refractory cable. That is, the same current passes through, but the volume is reduced. In terms of power supply capability of fire resistive cable: The power supply capability has advantages over traditional cable.

3. Laying methods of fire resistive cable and mineral insulated cable

Laying method of mineral insulated cable: No maintenance and replacement for more than 50 years (BTTZ cable life is more than 100 years), it can be laid or buried directly to save the cost of cable bridge. The laying method of the material of the fire resistive cable: It needs to be maintained and replaced frequently after a period of use, because it is easy to age and has a short life, and the later maintenance costs are high.

Fire resistive cable refers to cables that can maintain safe operation for a certain time under the condition of flame combustion. Fire resistive cable is widely used in high-rise buildings, subways, underground streets, large power stations, important industrial and mining enterprises, and other places related to fire safety and fire protection. For example, power supply lines and control lines of emergency facilities such as fire fighting equipment and emergency guidance lights. Mineral insulated cable is a kind of cable that wraps copper conductor core wire with copper sheath and uses magnesium oxide powder as inorganic insulating material to isolate the conductor and sheath. Commonly known as MICC or MI cable. There is a similar cable that wraps the core wire and insulating material with metal instead of the copper sheath, called mineral insulated metal sheathed cable.