Weight:
The weight of wires with good quality is generally within the prescribed range.For example, Plastic insulated single copper core wire with sectional area of 1.5, the weight is 1.8-1.9kg per 100 meter; Plastic insulated single copper core wire with a sectional area of 2.5 is 2.8 ~ 3 kg per 100 m; Plastic insulated single copper core wire with sectional area of 4, weight of 4.1 ~ 4.2 kg per 100 m.
Poor wires are underweight, not long enough, or have too many impurities in their copper cores.
Copper:
Qualified copper wire copper core should be purplish red, shiny, soft feel.And the copper core of shoddy copper core is violet black, slant yellow or slant white, impurity is much, mechanical strength is poor, tenacity is not good, a little force will break it, and often have broken phenomenon inside electric wire.
To check, simply strip 2 cm from one end of the wire and rub a piece of white paper over the copper core. If there is any black material on the white paper, it means there are many impurities in the copper core.
In addition, the insulation layer of fake wires looks thick, but is actually mostly made of recycled plastic. Over time, the insulation layer will age and leak electricity.
Manufacturer:
Fake wires are often has no production name, no production address, no production health license code. But it also has ambiguous origin labels, such as made in China, made in a Chinese province or city.This is actually equivalent to unmarked origin.
Price:
Fake and shoddy wire production cost is low, therefore, vendors in sales, often with cheap and fine quality for the cover of low sales, make people fooled.
Test:
We can take a wire head to bend repeatedly with the hand, if it feels soft, good fatigue strength, plastic or rubber feel elastic and no fracturing on the wire insulator, then it is excellent.
Look at the core:
See if the core is located in the middle of the insulation layer.Not medium is due to the technology is low and caused the core deviation phenomenon, in use if the power is small but also can live peacefully, once the electricity consumption is large, the thinner side is likely to be broken by the current.
Look at the length and core thickness:
To see if the length and core thickness have been tampered with.According to the relevant standards, the error of the wire length shall not exceed 5%, and the error of the section line diameter shall not exceed 0.02%.However, there are a lot of phenomena that short measures in length and falsification in section.For example, a line with a cross-section of 6 square millimeters is actually only 4.5 mm square.
Look at the packaging:
High quality wire is often done more neatly, feel very texture.National standard wire 1.5 to 6 flat wire insulation thickness requirements is 0.7mm, too thick is non-standard, corresponding to his core is certainly unqualified.Line leather you can pull hard, not easy to tear is the national standard.You can force to pull a line skin, not easy to tear is the national standard.
Cautery:
If the fire is extinguished within 5s after the fire leaves,those with certain flame retardant function are the national standard.
Post time: Jul-13-2019
