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Wire is the user in the process of electricity essential materials, its quality is good or bad, directly related to the thousands of households with electricity safety. Therefore, in the purchase or selection, how to quickly and accurately check the quality of the wire good or bad, is the majority of electricians must master the skills.
1. Weight.
Good quality wire, generally within the specified weight. Such as the commonly used cross-sectional area of 1.5mm2 plastic insulation single-stranded copper core wire, per 100m weight of 1.8 ~ 1.9kg; 2.5mm2 plastic insulation single-stranded copper core wire, per 100m weight of 2.8 ~ 3.0kg; 4.0mm2 plastic insulation single-stranded copper core wire, per 100m weight of 4.1 ~ 4.2kg and so on. Poor quality wire weight is not enough, either the length is not enough, or wire copper core impurities.
2. Copper quality.
Qualified copper core wire copper core should be purplish red, shiny, soft to the touch. The shoddy copper core wire copper core is purple-black, yellowish or white, more impurities, poor mechanical strength, poor toughness, a little force will break, and the wire is often broken within the phenomenon. Check, you just use an electrician's instrument to peel the wire at one end 2cm, and then use a piece of white paper in the copper core slightly rubbed, if the white paper on the black material, indicating that the copper core impurities are more. In addition, shoddy wire insulation seems to look very thick, in fact, most of them are made of recycled plastic, a long time, the insulation will be aging and leakage.
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