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How To Identify The Quality Of The Cable
Nov 22, 2018

Visual appearance discrimination

1. PVC sheath: The surface can be seen to have a regular "unevenness" in the inner mesh, indicating that the processing technology is good, and there is no relative sliding, which is a good cable. The appearance is smooth, and the "unevenness" of the compacted net is not seen. The hand-pinched jacket has a loose feeling, which is a poor cable;


2. Check the shielding layer network: whether the number is enough for copper meshing, check the solderability, tinned copper wire scrape to see if it is copper wire, the hardness of aluminum-magnesium alloy wire is obviously larger than copper wire; the mesh is sparse, distributed Uneven, not tight with the insulation layer, etc. is the difference cable;


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


4. Check the adhesion between the core wire and the insulation layer: Cut the insulation layer obliquely, and pull the core wire in the peeling direction to see if the core wire and the insulation layer are in contact with the process material; the cable has a large adhesion force and is poor. The cable is not glued;


5. Longitudinal tensile test: Take one meter of cable, layer and strip the core wire, insulation layer, shielding layer, and outer casing, each leaving 10 cm long. The method is: two hands respectively hold the adjacent two layers of the cable and pull in the opposite direction; the good cable generally pulls the power, and the difference cable can be easily pulled out without much effort - the elevator cable is very important, many so-called "Elevator-specific cables" have problems in this regard.