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 can be signs of poor quality.
Next, test the insulation by rubbing it with your fingers. Some low-quality insulation can easily fade or lose its color, especially red cables. After rubbing, if the color transfers to your fingers or the printed words on the sheath come off, this is a strong indicator of inferior quality.
Then, try peeling back the insulation using your fingernail or a small tool. If the insulation layer comes off easily or cracks when pulled, it’s likely a substandard product.
Bend the insulated wire repeatedly—about three to four times. Poor-quality insulation often cracks or breaks after just a few bends. This is a quick way to check the durability of the material.
Light the wire with an open flame and then remove the flame. If the insulation continues to burn on its own without the flame, it's a sign of low-quality or non-fire-resistant materials.
The core of the wire is typically made of copper or aluminum, and it should have a shiny, metallic appearance. If the core looks dark, dull, or lacks luster, it could be a sign of poor quality.
Finally, measure the outer and inner diameters of the wire. If you're unsure after the previous tests, use a caliper to check the dimensions. The acceptable tolerance is usually ±10%. If the measured values exceed this range, it’s likely a low-quality cable.
These steps help identify whether a wire is genuine or of poor quality. Always take your time and don’t rush the inspection process. A little extra care can save you from potential safety hazards down the line.
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