Irregular cooking is just a means.
2. The state stipulates that wires must be marked with a certain logo, and the same logo will be printed when the maximum is not more than 500mm, including product trademark, manufacturer name, implementation standard, etc.
3. The thickness of the inner core has certain requirements, but it is not very strict.
But it can't be much wrong, just a little, which is usually invisible to the naked eye.
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.
It's time to open the package and look at the wires inside. GB 1.5-6 square wires require a skin thickness (insulation thickness) of 0.7mm, and excessive thickness is non-standard. Accordingly, its kernel is definitely not enough. You can pull the steel wire skin hard, and the ones that are not easy to tear are generally GB. 6. Looking at the packaging, GB wires are often well made and neat.