Is Shenzhen Shengde Cable a national standard?

Shenzhen Shengde Cable is a national standard. According to the relevant public information, the factory outlets are Shengde GB 1.5 square BVR flexible cable, home improvement wiring series wires, Shengde GB RVV flexible cable 262*6 factory outlets, and Shengde brand with injection plug 22.5 power cord 3 meters.