How do two-pin industrial plugs distinguish between zero line and live line;Two-pin industrial plug is equipped with two-hole power socket. The power socket has a seat into which one or more circuit wires can be inserted, through which various wires can be inserted to facilitate connection with other circuits. A switch is arranged between the weatherproof socket resistor and the electromagnetic switch; the fuse and the electromagnetic switch are connected with a power line; the normally open switch of the electromagnetic switch is arranged on the power line; and the normally open switch of the electromagnetic switch is connected with the jack. Industrial plugs are applicable to industry, generally divided into 3-core, 4-core, 5-core, etc. Current is generally divided into 16A, 32A, 63A, 125A, 250A, 420A, etc. The protection level can be divided into IP44 and IP67, which are relatively conventional. Generally, it is used with industrial sockets and connectors. As we all know, the standard wiring method of the dual-hole power socket is to deal with which hole on the left side behind the power socket is the zero line and which hole on the right side is the live line.And most of the two-pin plugs do not distinguish the zero line from the live line, which means that they can be applied at will, and we do not need to distinguish the zero line from the live line;If you want to distinguish the zero line from the live line, you can see the sign L on the industrial plug for the live line N for the zero line.Three-pin plug distinguishes zero line from hot line:The standard wiring method of the three-pin plug is to deal with the reverse side of the power socket. The three holes in the power socket are the zero line in the lower left corner, the fire line in the lower right corner and the grounding line above.The three-hole plug matches the three hole socket. Look at the three plugs from the position where the industrial plug is inserted. The lower left is the zero line, the lower right is the live line, and the upper one is the ground line.You can also see the signs on the plug-L stands for hot wire, N stands for neutral wire, and e (pe) stands for ground wire, as shown below.What's the difference between three-socket zero line, hot line and ground line?1. The middle is the grounding wire on both sides, which is the live wire and the zero wire.2. Generally, the three hole socket in the home is not a three-phase socket, but the grounding wire is in the middle.3. There are fire line and zero line on both sides, fire line (L) on the right and zero line (N) on the left.4. The difference between the live wire and the zero wire depends on the working voltage to the ground:5. The working voltage of the live line to the ground is 220v, and the working voltage of the zero line to the ground is 0.6. The center line is the line found by the neutral point of the generator set or distribution transformer.7. If there is no grounding, it is called the center line. If the ground is good (zero ground potential difference),8. At this time, the center line is also called the zero line.