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How to identify the faulty wire and cable building security

Information Source:Henan Huadong Cable Co., Ltd Release date:2014-03-15

So far the development of security industry, new technology, new products emerge in an endless stream, wire and cable industry is developing rapidly, the cable as the basis of the most basic products, many manufacturers for their own benefit, Jerry, shoddy cable, violations of the rights and interests of consumers

1, the PVC sheath: surface can see tightly inside net regular "roughness", the processing technology, no relative sliding, is a cable; smooth appearance, see no pressing net "roughness", hand sleeve with a pine city, is on the cable

2, check the wire diameter: ---SYV cable is 0.78 to 0.8mm, the SYWV cable is 1.0mm; the recent emergence of a SYV75-5 cored wire diameter of 1.0mm cable, the cable characteristic impedance of 75 ohms, certainly not, does not apply to the 75 ohm transmission system

3, check the shielding layer net: series number is enough, the copper net, check the solderability, tin plated copper wire scraping the inside look at Is it right? Copper wire, aluminum magnesium alloy wire hardness significantly larger than the copper wire; net sparse, the distribution is not uniform, and the insulating layer wrapping is not tight is poor cable

4, check the core wire with insulating layer adhesion: oblique incision and insulating layer, according to the direction of pull wire stripping, see the core wire and the insulating layer has no adhesive materials; cable have greater cohesion, poor cable no adhesive. Longitudinal tensile experiment: take a meter cable, layered stripped wire, insulation, shielding layer and an outer sheath, the remaining 10 cm long. The method is: two hands respectively hold the cable of two adjacent layers, pulling in opposite directions; cable general strength could not pull the cable without much effort, the difference can be easily pulled out

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