Take a closer look at the label printing samples. The handwritten address is unclear or missing. Check the label itself and the insulating cover for any typos, color variations, or blurred text. These issues are red flags and should be carefully noted.
Next, test the insulation by rubbing it with your fingers. Some low-quality wire jackets tend to fade easily, especially red ones. After rubbing, you might notice color transfer on your fingers or the printed text disappearing. This is a strong indicator of poor quality.
Then, try peeling back the insulation using your fingernail. If the jacket can be easily scraped off or torn away, it's likely a substandard product. Good quality insulation should remain intact under light pressure.
Bend the insulated wire multiple times—three to four times. If the insulation cracks or breaks after a few bends, that’s another sign of inferior material. High-quality cables should withstand repeated bending without damage.
Light the wire with an open flame and then remove the flame. If the insulation continues to burn on its own, it’s a sign of poor quality. Good insulation should not self-ignite once the flame is gone.
Check the core material. It’s typically made of copper or aluminum, with a bright, metallic sheen. If the core looks dull, dark, or lacks luster, it may be low quality.
Lastly, measure the outer and inner diameters. If you’re unsure after the previous tests, use a caliper to check the dimensions. The acceptable tolerance is ±10%. If the measurements exceed this range, it’s likely a poor-quality cable.
These methods help identify whether a wire is genuine or substandard. Always take the time to inspect carefully—quality matters when it comes to safety and performance.
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