Poor quality of plugs, sockets and converters is an imp […]
Poor quality of plugs, sockets and converters is an important cause of electrical fires. The quality problems of small plugs, sockets and converters will cause serious harm to the personal and property safety of consumers. Therefore, when consumers buy plugs, sockets, converters, and switches, they should focus on the safety of the products, and the following performance indicators affect their safety:
The sign is an important basis for instructing people to install, use and maintain correctly, and is an extremely important safety standard content to ensure the safety of personal and property. Plug and socket products should be marked with the rated current, rated voltage, and power source properties in obvious locations. In addition, converters (converters refer to mobile electrical accessories with only one plug part and one or more socket parts combined) products must use the "MAX (or maximum)" symbol to mark the rated current/or power. To guide users to avoid overloading. Signs or symbols should be durable and legible. Do not use silk screens and paper stickers that can be easily erased.
The rated value is the most basic electrical interchange coordination parameter to ensure the normal, safe and coordinated use of plugs, sockets, converters and connected electrical appliances. For example: the rated current of the converter shall not be greater than the rated value of the plug part. Otherwise, it may cause danger when the user selects electrical appliances according to the rated current of the socket, the plug is overcurrent and generates heat; the minimum rating of the converter with fuse and overload protector should be equal to the mark on the fuse and overload protector The rating. Otherwise, product damage may occur.
The size is an important technical requirement related to the safe use of plugs and sockets and converters, and whether they meet the universal interchangeability requirements to avoid incorrect insertion. Unqualified size will affect the user's use or cause hidden dangers such as poor contact and mis-insertion, ranging from damage to the equipment, and serious to fire and electric shock accidents.
Protection against electric shock
Anti-electric shock protection is a key safety index to ensure that plugs, sockets and converters will not cause electric shock accidents to users and others under normal use, and even some accidents. When the plug is fully or partially inserted into the socket, the live part of the plug should not be touched; any plug of the plug should not be inserted into the live socket of the socket when the other pins are in the reachable state. Plug sockets and converters with protective doors should be able to prevent the insertion of single poles or probes.
The socket component of the socket should have enough elasticity to ensure sufficient contact pressure on the plug pin. The plug sleeve should be corrosion-resistant and wear-resistant to ensure good contact between the plug and the socket; the plug of the plug should be locked and cannot be rotated, otherwise it will affect the insertion performance and cause unsafe factors; the converter has a flexible cord fixing device to ensure The flexible cord is fixed and can withstand normal tension and torsion; when plug and socket are inserted, the mating surfaces should be basically tight to prevent electric shock accidents.
The power cord should have enough cross-sectional area to ensure that the power cord will not heat up and cause insulation damage, which may cause short circuits, fire, leakage, and cause accidents. For example, the cross-sectional area of the power cord of a common 250V, 10A converter should be greater than or equal to 0.75mm2.
Plugs and sockets should have sufficient mechanical strength to withstand various mechanical stresses caused by drops, impacts and extrusions during installation and use; sockets with protective doors should be able to prevent unipolar insertion.
Heat and flame resistant
High temperature has a great influence on the various properties of insulating materials. Under high temperature conditions, the structure and characteristics of insulating materials will undergo essential changes. This change determines the reliability of the material. Some materials will gradually become soft at high temperatures. The mechanical strength decreases, which will affect the quality of the plug and socket and the safety in use. In addition, the insulating material of the plug and socket should have certain flame-retardant properties. Otherwise, the product will be out of control if it catches fire during use.