As all ports are near the sea or river, it is necessary to consider the moisture-proof performance of switching power plugs, as well as the international characteristics of the wireless communication network of marine containers, some temporary loading and unloading equipment and switching power supplies for mechanical equipment maintenance. CEE connector CEE standard industrial plug socket is an explosion-proof socket, and the temperature is limited below 32 degrees. Industrial plugs are suitable for industry, generally divided into 3-core, 4-core, 5-core, etc. The current is generally divided into 16A, 32A, 63A, 125A, 250A, 420A, etc., and the protection level can be divided into IP44 and IP67, which are relatively conventional. Generally, it is used with industrial sockets and industrial connectors. The power socket has one or more seats into which circuit wiring can be inserted, through which various wiring can be inserted to facilitate connection with other circuits. 1 container power supply system.The switching power supply equipment of port logistics must be matched with international shipping facilities. In order to keep the refrigerated temperature in the container during the whole process of shipment, it is necessary to plug in the refrigerator at the port. Therefore, it is decided that the stacking yard must be equipped with power sockets of the same specifications and models as the shipping container. It is necessary to use 380V 32A ground pole 3h, 4 pole, immersion-proof industrial plug.Port mobile terminal power supply systemThere are some loading, unloading and handling machinery and equipment that often have to be moved on the port, so it is more convenient to move and actually operate the machinery and equipment by applying plug-in wires. Such as buried scraper conveyor and auxiliary tools and equipment, the earth pole 6h immersion-proof industrial plug is generally used.3 Maintenance of port machinery and equipmentPorts are usually large places where goods are loaded and piled up. There are all kinds of loading and unloading machinery and equipment, including large and medium-sized doors, cranes, belt conveyors, conveyor belts, etc. However, whether it is a large or medium-sized portal crane or a long coal conveying belt, sometimes it must be repaired. For the convenience of maintenance, a power plug or a power box should be set on the side of the machine. DC welding machines and other machinery and equipment, such services, can be plugged in as soon as possible using switching power supply. Similarly, the maintenance workshop must also be equipped with industrial plugs or socket boxes for switching power supply. Power box overhaul is generally equipped with various telephone poles 6h, socket type waterproof box type industrial power socket.