The Principle and Types of Fire Resistant Cables

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The Principle of Fire Resistant Cables

Fire resistant cable is a new type of cable with a seamless copper tube sheath on the outer layer, mineral crystal powder in the middle as the insulating material, and a single-strand copper rod as the conductor.

It not only can withstand high temperature, fireproof, explosion-proof and flame retardant, but also has large current carrying capacity, small outer diameter, high mechanical strength and long service life. In addition, fire resistant cables generally do not require separate grounding conductors. Its specifications mainly include single core, three cores and four cores. Among them, single-core to four-core mineral cables are mainly used for power and lighting.

Fire Resistant Cable

The Cables Mainly Have Copper Conductors:

Conductors can be divided into bare copper, copper-plated, copper-clad steel, copper alloy, copper foil wire, etc.

Bare Copper:

Conductor resistance is small, easy to oxidize copper plating---enhanced oxidation resistance.

Tinned Copper:

Enhanced oxidation resistance, convenient for subsequent welding of silver-plated copper---strong conductivity, high price, mostly used in radio frequency cables and fluoroplastic high temperature wires.

Copper Clad Steel:

High strength, often used for overhead cables.

Copper Alloy:

High strength (less other metals are added to copper).

Copper Foil Wire:

Strong bending resistance and high softness (the copper is pressed into a thin sheet and then wrapped on the elastic fiber).

In order to improve the strength of the conductor, a method of twisting multiple copper wires is usually adopted.

Cable Insulator:

Commonly used insulation materials include PVC (PolyVinyl Chloride), SR-PVC (Semi-rigid PVC), PP (Polypropylene), PE (Polyethylene), Foam-PE, Foam-PE+ Skin, etc., as well as the latest magnesium oxide mineral insulators.