1. Sheath: surface can see pressure inside the net regularly "roughness", shows that good processing technology, won't produce the relative sliding, is a good cable. Appearance is smooth, can not see compaction net "roughness", knead sheathed have loose feeling with the hand, is a bad cable;

2. Check the shield net: if it is made up several copper net, check the weldability, copper wire, tin copper scrape see full aluminum magnesium alloy wire is bigger than the hardness of the copper wire; Fabric is thin, uneven distribution, and the poor is not tight and cable insulation package

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

4. Check the conductor and insulation layer of touch force: oblique incision insulating layer, according to the direction of stripping away conductor, the conductor and insulation ever touch us craft materials; Good cables have larger touch together, bad cable untouched;

5. The longitudinal tensile experiment: take a meter cable, layered peeling conductor, insulation, shielding layer, outside the door, each 10 cm long. The method is: two hands grip the adjacent two layers of the cable respectively, pull to the opposite direction. Good cable forces pull, generally poor cable at no cost to can easily pull out - this one is very important, the elevator cable many so-called "elevator cable have this aspect of the problem;

Now too many false wire type and simulation is also high, ordinary people are hard to identify the most bad is he also deception everywhere merchants, the copper, the ordinary businesses have only deceived life, now I give you my only experience sharing, hope useful for friends; Now on the market of false copper wire has the following several types:

1) general false copper wire, copper clad aluminum, copper clad aluminum magnesium alloy, copper clad steel, copper, iron.

2) high imitation fake copper wire: according to certain proportion in the multi-strand copper wire and copper clad aluminum magnesium alloy and other material after copper plating processing, generally on a lot more expensive than copper after all there is in it.

3) substandard copper wire: material is not made of oxygen-free copper wire drawing copper wire, transmission performance is bad, or just some insufficient, etc.; As the saying goes, true gold fears not the fire, true and false SYV, RVV copper wire line can also use fire to distinguish authenticity, first of all, through a cutting line with a copper wire and put them to share a little sparse (better) general with windproof lighter to burn, it will be in the sky, the real copper wire is very high temperature resistant, more than a minute at most is absolutely no problem can color change, if it is the copper clad aluminum, copper clad aluminum magnesium alloy will bend down soon enough, if it is the copper clad steel, copper to iron the burn a blow with a knife after he is in the sky.