There are two common industrial plugs and sockets: fixed and mobile. A socket into which one or more circuit wiring can be inserted, through which various wiring can be inserted to facilitate connection with other circuits. 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. IP54, that is, dust prevention is level 5: dust intrusion cannot be completely prevented, but the amount of dust intrusion will not affect the normal operation of the product; Waterproof grade 4: prevent splashing water from invading, and prevent splashing water from all directions from invading.The mobile socket can be moved and used conveniently according to the needs and changes of occasions, but due to frequent movement, the probability of falling and bumping in the moving process will be greater.1. There are one or more positions of the movable socket with 1.Gb hole, including two poles with grounding holes, two poles holes and two poles double holes. The plugs include detachable bipolar plugs (for users' own use), non-detachable bipolar plugs (the cord length is more than 2m), detachable bipolar plug grounding plugs and non-detachable bipolar plug grounding plugs.2. "Multi-purpose" portable socket (converter type), this type of socket is the most popular product on the market at present, but it is also the product with the most quality problems due to the popularity of many inferior sockets.Therefore, the basic principles for selecting plugs and sockets are:1. First of all, observe whether there is a clear product representation and production conformity inspection mark on the product: manufacturer or trademark, model, rated voltage, rated current and related warnings, etc. Because the rated current of plug and socket products is clearly defined in the national standard. Household sockets are divided into three levels: 6A, 10A and 16A, while other signs such as 13A and 15A are non-standard products and are not allowed to be listed.2. Don't buy low-priced shops in informal shops or street stalls, because most of these shops are "three noes" products. Therefore, we should try our best to buy well-known enterprise brands or enterprise products with 3c certification in the formal market shopping center, especially those qualified products that have been supervised by the state for many times.3. When purchasing mobile sockets, try to choose the national standard socket as much as possible, which is more suitable for general use in China. When purchasing, we should pay more attention to whether the ratings of the plug and socket parts of the product match.