Industry News

Analyze The Essential Differences Between Fire-Resistant Cables, Flame-Retardant

Published by Author: Joey Wan September 08,2022


What is fire resistant XLPE cable? What we mean literally is: Is the cable that can withstand fire really the same as the literal meaning?

Fire resistant cable

cable XLPE

Yes, fire-resistant cables can indeed operate normally for a period of time when the flame is burning, and can usually maintain normal operation for at least 180 minutes at a flame temperature of 750-800 °C. However, it should be noted that there is a limit in the burning time, and it is not possible to burn for a long time; the main function of fire-resistant cables is to use the power supply lines and control lines of emergency facilities such as fire-fighting equipment and emergency guide lights.

Fire-resistant wires are divided into NHA and NHB grades. Class A fire-resistant cables are preferred in high-demand places such as flammable places, while common cable configurations usually use class B fire-resistant cables.

There are differences between fire-resistant cables and high-temperature cables, so they cannot be used as high-temperature cables, and the number of cable joints should be minimized when laying, and attention should be paid to the sealing treatment at the joints to ensure that the line can work more safely and normally in a fire. .

Flame retardant cable

cable XLPE

The difference between fire-resistant cable, flame-retardant cable and fire-resistant cable

The characteristic of fire-resistant cable is that the cable can work normally for a certain period of time when the flame is burning, and it can maintain normal operation for 180 minutes under the flame temperature of 750-800 ℃, but after this period of time, the cable can not be guaranteed to operate normally.

In terms of fire-resistant cables, they are somewhat similar to flame-retardant cables; fire-resistant cables are often represented by the letters NH, and low-smoke halogen-free fire-resistant cables are represented by models WDNA or WDNB to represent the functional characteristics of the cable.

The characteristics of flame-retardant cables are that in the event of a fire accident, they can retard the spread of flames and delay the spread of cables, and minimize the burning range of cables. At the same time, flame-retardant cables have the advantages of flame retardancy and self-extinguishing; The flame retardant effect is also divided into grades, which are usually expressed by ZR, ZC, ZB, and ZA. The flame retardant effect is better from left to right; some cables with flame retardant effect also include the characteristics of low smoke and low halogen. The commonly used models WDZB, WDZR said.

Fireproof cable

cable XLPE

The characteristic of fireproof cable is that it neither burns nor prolongs burning; it is made of special materials, with seamless copper tube as sheath and magnesium oxide as insulating material. BTLY, YTTW, BBTRZ, HFTGB, BBTZ, etc. Experiments show that fireproof wires and cables still operate normally at 800-900℃ for 2 hours, and continue to operate normally within 30 minutes at 1000℃.

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