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How to Visually Identify the Appearance of Wires and Cables

We can identify from the following 5 aspects.

How to visually identify the appearance of wires and cables

1. PVC sheath: The surface can see the regular "unevenness" of the braided mesh inside, indicating that the processing technology is good and there will be no relative slippage, which is a good cable. The appearance is smooth, and the "unevenness" of the compressed braid is not visible, and the jacket has a loose feeling with the hand. It is a poor cable;

2. Check the screen of the shielding layer: whether the number of the screen is enough for copper, check the solderability, tinned copper wire scraping to see if it is copper wire, the hardness of the aluminum-magnesium alloy wire is significantly greater than the copper wire; the screen is sparse and distributed Uneven, not tightly wrapped with insulation, etc. are poor cables;

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

4. Check the adhesion force of the core wire and the insulation layer: Cut the insulation layer obliquely and pull the core wire away in the stripping direction to see if the core wire and the insulation layer are bonded with process materials; good cables have a large adhesion force, poor The cable is not contaminated;

5. Longitudinal tensile test: take one meter of cable, peel off the core wire in layers, insulation layer, shielding layer, outer house, and leave each 10 cm long. The method is: two hands hold the adjacent two layers of the cable and pull in the opposite direction; the good cable generally cannot be pulled by force, and the poor cable can be easily pulled out without much effort-the elevator cable is very important, many so-called "Elevator special cables" have problems in this regard.


Yeahui is a connector supplier with 11 years of experience in developing high-quality connectors and wiring harnesses. We have many types of products, including obd connector, circular connector, agricultural connector and so on. We can meet the requirements of various customers. Feel free to learn more about connectors or buy our connectors, looking forward to your message.

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