How are the fire retardant grades of wires and cables classified?

Aug. 10, 2022

Different application scenarios have different requirements for wire and cable materials. Fire resistant cables are often used in fire protection systems; Low smoke and halogen-free cables will be used in crowded places; Flame retardant cables are generally used in flammable and high-temperature areas. These flame-retardant, fire-resistant, low smoke and halogen-free and other types of cables are cables with different characteristics that have been optimized according to the manufacturing process and materials in conventional models. These cables also have certain grades. How are the grades of flame retardant cables classified among these cables?

Flame retardant cables are usually represented by the letter ZR. Flame retardant cables are divided into three levels: ZA, ZB and ZC. ZA stands for Class A flame retardancy, ZB is Class B flame retardancy, and ZR defaults to ZC, that is, Class C flame retardancy. The order of flame retardant properties from high to low is ZA>ZB>ZC, which means that the flame retardant grade of ZA is the best.

Both household wires and cables can be classified into flame retardant grades. Class A, B and C of flame retardant cables are classified according to the standard of alt bt 18380-2008, which is used to evaluate the ability of vertically installed mature wires, cables and optical cables to inhibit flame and vertical spread under specified conditions.

Flame retardant cable has the ability of flame retardant cable spread, but it cannot be guaranteed that it will not be damaged during combustion. The role of flame retardant cable is to limit the burning range of the flame when the wire and cable are on fire, prevent the spread, protect other equipment, and avoid greater loss caused by flame spread.

The wires and cables produced by Zhuhai Wire and Cable Factory are in line with the national standards. Welcome to inquire!!!

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