Wires are indispensable materials for users in the process of using electricity. The quality of the wires is directly related to the safety of electricity used by thousands of households. Therefore, when purchasing or selecting, how to quickly and accurately check the quality of the wire is the skill that the majority of electricians must master.
1 weight. Good quality wires are generally within the specified weight range. For example, the commonly used plastic insulated single-strand copper core wire with a cross-sectional area of ​​1.5mm2 is 1.8-1.9kg per 100m; the plastic insulated single-strand copper core wire of 2.5mm2 is 2.8-3.0kg per 100m; the plastic of 4.0mm2 The insulated single-strand copper core wire has a weight of 4.1 to 4.2 kg per 100 m. Poor quality wires have insufficient weight, either insufficient length or excessive copper core impurities.
2 copper. The copper core of the qualified copper core wire should be purple, shiny and soft to the touch. The copper core of the inferior copper core wire is purple-black, yellowish or white, with many impurities, poor mechanical strength, poor toughness, and will break when a little force is applied, and the wire is often broken. When inspecting, you only need to peel off the wire 2cm, and then use a piece of white paper to slightly rub the copper core. If there is black substance on the white paper, it means that there are more impurities in the copper core. In addition, the inferior wire insulation layer seems to be very thick, and in fact it is mostly made of recycled plastic. Over time, the insulation layer will age and leak.
3 manufacturers. Counterfeit and shoddy wires are often three-nothing products, but there are also ambiguous origins and other marks, such as those made in China, manufactured in a certain province or city in China, which is actually equal to the unmarked place of origin.
4 prices. Due to the low production cost of counterfeit and shoddy wires, traders often sell at low prices with low prices and good prices when selling.
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