At present, there is no corresponding national standard definition of fire-resistant cable in our country. The cable industry is used to call the cables with certain fire-resistant performance, such as flame-retardant cable, fire-resistant cable, mineral insulated non combustible cable, as fire-resistant cable.
Flame retardant cable is a kind of cable with specified flame retardant properties (such as flame retardant characteristics, smoke density, smoke toxicity and corrosion resistance).
Flame retardancy refers to the characteristic that when the sample is burned under the specified test conditions, after the fire source is removed, the flame spread on the sample is only within a limited range and extinguishes itself, that is, it has the ability to prevent or delay the occurrence or spread of flame.
Fire resistant cable is the cable with specified fire resistance performance (such as line integrity, smoke density, smoke toxicity and corrosion resistance).
Fire resistance performance refers to the ability to continuously operate under the specified state when burning under the specified fire source and time, that is, the ability to maintain the integrity of the line.
Mineral insulating non combustible cable is composed of copper core, mineral insulating material, copper and other metal sheath. In addition to good electrical conductivity, mechanical and physical properties, fire resistance, it also has good non combustible property. Under fire conditions, this kind of cable can not only ensure fire power supply within the duration of fire, but also can not delay combustion and produce smoke.
Next, let's take a look at the laying requirements of these cables in the fire protection line according to the specification requirements
1、 According to the requirements of code for fire protection design of buildings (GB 50016-2014), the fire distribution line shall meet the following requirements:
1. When flame retardant cable or fire-resistant cable is used and laid in cable well or trench, it can be protected without metal conduit or enclosed metal box.
2. When mineral insulated non combustible cable is used, it can be directly laid in the open.
3. When the fire power distribution line and other power distribution lines are laid in the same cable well or trench, mineral insulated non combustible cables shall be used.
2、 According to the requirements of code for design of automatic fire alarm system (GB 50116-2013), the fire line shall meet the following requirements:
1. Fire resistant copper wire and cable shall be used for power supply line and fire linkage control line of automatic fire alarm system.
The transmission lines such as alarm bus, fire emergency broadcast and fire special telephone shall adopt flame retardant or fire retardant wires and cables.
2. Mineral insulation non combustible cable can be directly exposed.
Code for fire protection design of buildings does not stipulate that fire-resistant cables or fire-resistant cables should be used for fire-fighting distribution lines and cables that are protected by metal conduit or enclosed metal box and concealed cables.
However, it is stipulated in code for design of automatic fire alarm system that:
1. Fire resistant copper wire and cable shall be used for power supply line and fire linkage control line.
2. The transmission lines such as alarm bus, fire emergency broadcast and fire special telephone shall adopt flame retardant or fire retardant wires and cables.
It can be seen from the above
The requirement of code for design of automatic fire alarm system is higher than that of code for design of building fire protection. If automatic fire alarm system is involved, it should be implemented according to the code for design of automatic fire alarm system.
The above is the whole content of the concept difference and laying requirements of fire-resistant cable, flame-retardant cable, fire-resistant cable and mineral insulated non combustible cable. If you want to know more information, please go to our official website to consult customer service. We will answer for you wholeheartedly and make you satisfied.
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