识别低烟无卤控制电缆的简易方法-安徽宏林仪表线缆有限公司

A simple method for identifying low smoke halogen-free control cables

Author：hlyb Add Time：2016-09-06 15:29:40

A simple method for identifying low smoke halogen-free control cables

1. Product name identification method

Wire - low smoke halogen-free flame retardant polyethylene insulated wire and cable; Cable - low smoke halogen-free flame retardant polyethylene insulated low smoke halogen-free flame retardant polyethylene sheathed power cable. Generally, the name of the imitation products will be a little different, such as polyethylene insulated low smoke halogen-free sheathed flame-retardant power cable and so on.

2. Skin scalding

Scald the insulating layer with an electric soldering iron. There should be no obvious depression. If there is a large depression, it indicates that the material or process used in the insulating layer is defective. Or barbecue with a lighter. Under normal circumstances, it should not be easy to ignite. After burning for a long time, the insulation layer of the cable is still relatively complete, there is no thick smoke and pungent smell, and the diameter is increased. If it is easy to ignite, it can be determined that the insulation layer of the cable does not use low smoke halogen-free material (probably polyethylene or cross-linked polyethylene). If there is large smoke, it indicates that the insulation layer uses halogen-containing material. If the insulation surface falls off seriously and the diameter does not increase significantly after long-time combustion, it indicates that appropriate irradiation cross-linking process treatment is not carried out.

3. Hot water immersion method

Soak the wire core or cable in hot water at 90 ℃. Under normal circumstances, the insulation resistance will not drop rapidly and remain above 0.1M Ω / km. If the insulation resistance drops rapidly or even lower than 0.009m Ω / km, it indicates that it has not been treated by appropriate irradiation crosslinking process. (polyethylene or cross-linked polyethylene insulating materials are not applicable to this method, but can be identified by the method in Article 2 above).

4. Density contrast method

The density of low smoke halogen-free material is higher than that of water. You can peel off a little insulating layer and put it into water. If it floats above the water surface, it must not be low smoke halogen-free material.

Low smoke halogen-free flame retardant wires and cables have been widely recognized by the majority of electricians and electrical practitioners for their excellent comprehensive electrical and physical properties, and have been applied in a series of national large-scale landmark buildings such as the main project of the Beijing Olympic Games and the Great Hall of the people in Beijing, showing a good market prospect. However, it is worrying that in recent years, some phenomena of copying or even counterfeiting the product have been found, which seriously threatens the project quality and image of key construction projects.

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A simple method for identifying low smoke halogen-free control cables