Identify key points of wire and cable materials

1, look at the packaging, the national standard wire is often done better, neat, hand up a sense of quality. 2. To open the package and look at the wires inside, the national standard wires 1. 5 --The requirement for a 6-square wire is thick skin (Insulation thickness)It is 0. 7mm, too thick is non-standard, and the corresponding inner core is definitely not enough. You can pull the thread hard, it is not easy to tear is generally the national standard 3, with a fire, after leaving the 5S to extinguish, there is a certain flame retardant function for the national standard line. 4, look at the inner core, the material of the inner core (Copper) The higher the brightness, the better the copper quality, and the light is even, shiny and without layering. The requirements of the national standard core must use oxygen-free copper. Non-standard such as black copper, there may be hidden dangers. 5. Countries have certain requirements for the thickness of the inner core, but it is not very strict. However, there are not many mistakes, only a little bit, which are generally invisible. 6, length, the country does not force must play rice, but there are many manufacturers also play Rice, play rice is not necessarily a national standard, but the general national standard generally does not play rice. The non-standard hit is just a means. 7. The State stipulates that there must be a certain mark on the wire. The maximum number will not exceed 500mm. There will be the same mark on the next line. The above usually has the trademark of the product, the name of the manufacturer, implementation of standards and so on, so the safety of wire and cable is not a trivial matter, must choose qualified wire, do not blindly pursue cheap, and ignore the quality.