How can I distinguish copper wire?
Buy wire should be purchased in the regular market, by country electrician certification mark (the Great Wall pattern), the regular manufacturers of wire, transparent wrapper of each bundle will have the certificate, the certificate shall include: name and address, certification number, specifications, wire length, rated voltage etc.. The fake wire is often the "three product", but it was also identified as the origin of ready to accept either course, China manufacturing, manufacturing China province or a city, it is not the actual standard of origin.
If the length is enough, can count the number of rings, and then take the length of each circle, then each lap length value multiplied by the total number of rings, the length of the wire out of the actual number is.
The plastic skin of the regular wire is soft and smooth and of uniform color. In its surface, should also be printed with the product certification on several items, such as: specifications, models, factory name, site, etc.. At the same time, the writing must be clear and difficult to erase. Shoddy wire insulation seems to be very thick, in fact, most of the cable is recycled plastic, and for a long time, the insulation layer will be aging and leakage.
When you buy, you can cut off a little plastic skin and check the copper wires inside. Touch the top of copper wire with palm, copper core wire, copper core should be purple, shiny and soft. Regular wire copper wire color is bright reddish, and the copper wire copper core and purple black, yellowish or whitish, impurity, poor mechanical strength, poor toughness, little force will be broken, and often wire breakage phenomenon.
