In many wires or industrial plugs, people often see two letters, namely "L" and "N". NEMA wiring device must be as small as possible in order to realize frequent commutation, but also to realize braking during commutation and acceleration after commutation. Therefore, it is necessary to adopt rapid commutation device and smart braking device. CEE connector CEE standard industrial plug socket is an explosion-proof socket, and the temperature is limited below 32 degrees. A socket into which one or more circuit wires can be inserted, through which various wires can be inserted to facilitate connection with other circuits. Do you know what these two letters stand for? Generally, in the wire sign, "l" stands for live wire, that is, live wire; And "n" stands for zero line, that is, Naught wire. It is marked to distinguish the live wire from the zero wire, and the purpose is to make it difficult for welders to confuse the zero wire with the live wire when installing wires. Why can't the zero line and the fire line be confused? Why people don't know the zero fire line. In fact, the biggest difference between them is the difference between working voltage and ground. Generally speaking, the working voltage from the zero line to the ground is zero, because the working voltage from the zero line to the grounding device and the fire line to the ground is 220v. Frequently asked questions about industrial plugs: 1) The application site of industrial plugs and sockets should avoid corrosion, flammable and explosive vapor and conductive floating dust. Prevent industrial plugs from strong impact, vibration and extrusion. 3) The load current shall not exceed the rated current of the plug and socket. The screws of terminals and cable connection terminals must be tightened, otherwise, the poor grounding device will cause electrical burns to the socket. 5). It is forbidden to use electric wire knot plugs, such as sockets, to replace industrial plugs. 6) The industrial plug or RF connector should be offline when not in use to prevent pollution or road surface moisture regain.