How to Identify Inferior Building Security Cable?

From the surface you can see pressure inside net regular "roughness", shows good processing technology, it won't produce the relative sliding, is good building security cable; Appearance is smooth, can not see compaction net "roughness", if knead sheathed have loose feeling with the hand, it is a bad cable.

Check the shielding layer braid net: if the braiding quantity is nough, copper braiding net, check the weldability, Tinned Copper wire, scrape to see if it is copper wire, the hardness of aluminum magnesium alloy wire is bigger than that of copper wire; braiding net is sparse, uneven distribution, and package not tight with cable insulation, it will be bad cable.

Check conductor: diameter - SYV cable of 0.78 - 0.8mm, SYWV cable 1.0mm; Recently there is a SYV75-5 conductor cable of 1.0mm diameter, the characteristic impedance of the cable will be certainly not 75ohms, should not applied to the transmission system of 75ohms.

Check the adhesion force of conductor and insulation layer: oblique incision insulating layer, according to the direction of stripping away conductor, the conductor and insulation layer have bonding process materials; Good wire cable has bigger adhesion force, poor cable without sticking.

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Fire-resistant cables for security alarm

The field repair of the cable also must be prepared to some of the tools and materials used fully, plastic welding torch is essential, high-voltage insulating tape, waterproof tape and plastic insulated and sheathed strip cut leather, such as sealing material, must also be prepared, because the cable insulation sheath material is mainly divided into crosslinked polyethylene, polyethylene, PVC etc. Some materials belong to thermosetting materials, such as crosslinking polyethylene insulation can't repeat the molten again use, use of raw materials for repairing in site, can only use high voltage insulation tape and repair in United States 3 m tape series for repair. And some of the material belongs to thermoplastic material, can again with high temperature, fused using such as polyethylene, PVC and other materials, can live out, using the cable ends covering materials for cutting down the edges of cut into thin strips, can realize the low voltage cable insulation and sheath repair, the repair quality can fully meet the cable normal use performance requirements.

Another for medium voltage Security cables cable sheath damage phenomenon during the processing, cannot too rough, a process is the installation of the cable must be a light to put, please again after a cable appear external damage, its internal insulation damage sometimes is to say, the author used on construction site installation process accidentally damage to large area of outer sheath of the cable, and with returned to the factory, found that the partial discharge of cable damage levels and breakdown phenomenon, so for medium voltage power cable laying process appeared at the scene of outer sheath after damage, it is best to truncate or to replace the cable intermediate joint, because after the sheath of cable damage repair, there may be using.