It's time to open the package and look at the wires inside. The conductor of GB 1.5-6 square meters requires a sheath thickness (insulation thickness) of 0.7mm, and if it is too thick, it will be non-standard. Accordingly, its kernel is definitely not enough. You can pull the wire skin hard. It is generally GB 3 that is not easy to tear. It will go out within 5 seconds after leaving, which has a certain flame retardant effect.
4. Looking at the inner core, the higher the brightness of the material (copper) of the inner core, the better the copper, with uniform brightness, luster and no layering.
The national standard requires that the inner core must use oxygen-free copper.
Hei Bang copper and other non-standard items may have potential accidents.
5. Core countries have certain requirements for thickness, but they are not very strict.
But it can't be much wrong, just a little, which is usually invisible to the naked eye.
6, length, the country does not force rice, but many manufacturers also play rice, not necessarily the national standard, but the general national standard generally does not play rice.
Irregular cooking is just a means.
7. The state stipulates that there must be a certain mark on the wire, and the same mark will be printed when the maximum is not more than 500mm, including product trademark, manufacturer name, implementation standard, etc.