"Construction site temporary power safety technical specification JGJ46-2005" Article 9.5.2 AC arc welding machine transformer primary side power line length should not be greater than 5m, its power supply into the line must be set at the protective cover.
Article 9.5.4 of the secondary line of the welding machine should be used waterproof rubber sheathed copper-core flexible cable, the cable length should not be greater than 30m, shall not be used in place of metal components or structural steel secondary line of the ground.