... 2;2,Flammable gas and steam class: IIA, IIB, IIC;3,Temperature group: T1~T4/T5;4,Locations containing corrosive gas.Features1 ... ,Plug and switch are made into interlocking device.Only if switch is off, the plug can be pulled out to ensure safe.3,Socket ... cover that will cover the socket after pulling out the plug to keep it from outside matter.4,The plug steel pipe or cable ...