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How to identify counterfeit and inferior cables for building security?

Release time:2020-12-25 11:11:52Popularity:

1. PVC sheath: the surface can see the regular "unevenness" of the knitting net inside the compression, indicating that the processing technology is good, and there will be no relative sliding, and it is a good cable; the appearance is smooth, no compressed knitting "Unevenness", pinch the sheath by hand, there is a sense of looseness, which is a poor cable.

       2. Check the shielding layer braiding: whether the number of braiding is sufficient, braiding the braided copper wire, check the solderability, scraping the tinned copper wire to see if it is copper wire inside, the hardness of the aluminum-magnesium alloy wire is obviously greater than that of the copper wire; the braiding is sparse, Uneven distribution, not tightly wrapped with insulating layer, etc. are bad cables.

       3. Check the core wire: diameter ---SYV cable is 0.78 to 0.8mm, SYWV cable is 1.0mm; recently, a SYV75-5 cable with a core diameter of 1.0mm has appeared. The characteristic impedance of this cable is definitely not 75 ohm, not applied to 75 ohm transmission system.

       4. Check the adhesion between the core wire and the insulating layer: cut the insulating layer diagonally, pull the core wire in the peeling direction, and see if the core wire and the insulating layer have bonding process materials; good cables have greater adhesion, poor cables There is no bonding.

       Longitudinal tensile test: take one meter of cable, strip the core wire, insulation layer, shielding layer, and outer sheath in layers, leaving 10 cm each.

       The method is: hold the two adjacent layers of the cable with two hands and pull them in opposite directions; good cables generally cannot be pulled by force, but poor cables can be easily pulled out without much effort.

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