AC welding machine safety knowledge

1, the shell must have the protection of zero, 'there should be two times the no-load step-down protector and electric shock protector.
2, the power supply should use automatic switch, wiring board should be no damage, a protective cover. The length of the first line shall not exceed 5m, and the length of the two line shall not exceed 30m.
3, welding field 10m range, shall not have flammable and explosive articles.
4, the rainy day may not work outdoors. In wet place, be sure to stand on the board or other insulating material.
5, mobile electric welding machine, should cut off the power supply, shall not use the method of dragging cable. When a sudden power failure occurs during welding, the power supply should be cut off immediately.