What are the factors that affect the safety performance of p
Source:未知Author:admin Addtime:2020-07-04 17:25:02 Click:
The poor quality of power cord plug and socket is an important cause of electrical fire. The quality problem of small plug and socket will cause serious harm to the personal and property safety of consumers. Therefore, it is necessary to pay attention to the safety performance of power cord plug to avoid the occurrence of electrical fire. The main factors affecting the safety performance of power cord plug are as follows:
Sign is an important basis to instruct people to install, use and maintain correctly. It is also an extremely important content of safety standard to ensure personal and property safety. Plug and socket products shall be marked with rated current, rated voltage, power supply nature, etc. In addition, the converter (refers to the mobile electrical accessories with only one plug part and one or more socket parts) products shall be marked with "max (or maximum)" symbol to indicate the rated current / or power, so as to guide users to avoid overload. Signs or symbols shall be durable and legible. Silk screen and paper stickers that can be easily erased should not be used.
Rated value is the most basic electrical interchange parameters to ensure the normal, safe and coordinated use of plug, socket, converter 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 and matches electrical appliances according to the rated current of the socket, and the over-current heating of the plug may occur; the minimum rating of the converter with fuse and overload protector shall be equal to the rated value marked on the fuse and overload protector. Otherwise, product damage may occur.
Safety performance of power cord plug
Size is an important technical requirement which is related to whether the plug, socket and converter can be used safely and meet the general interchangeability requirements to avoid misinsertion. The unqualified size will affect the user's use, or cause the hidden dangers such as poor contact and wrong insertion, which may cause damage to the equipment at least, or cause fire and electric shock accidents.
The protection against electric shock is a key safety index to ensure that the plug, socket and converter will not cause electric shock accidents to users and others under normal use or even some accidents. When the plug and socket are fully or partially connected, the live part of the plug shall be inaccessible; any pin of the plug shall not be connected with the live socket of the socket when other pins are accessible. Plug, socket and converter with protective door shall be able to prevent single pole or probe insertion.
The socket assembly should be flexible enough to ensure sufficient contact pressure on the plug pin. The plug sleeve shall be corrosion-resistant and wear-resistant to ensure good contact between the plug and socket; the plug pin of the plug shall be locked and cannot be rotated, otherwise the insertion performance and unsafe factors will be affected; the converter shall be equipped with flexible wire fixing device to ensure that the flexible wire is fixed and can withstand normal tension and torsion; When the plug and socket are connected, the connection surface should be basically tight to prevent electric shock.
The power line should have enough cross-sectional area to ensure that the power line will not be heated and lead to insulation damage, resulting in short circuit, fire, leakage and accidents. For example: the common 250V, 10a converter power line sectional area should be greater than or equal to 0.75mm2.
The plug and socket shall have sufficient mechanical strength to withstand various mechanical stresses caused by drop, impact and extrusion during installation and use; the socket with protective door shall be able to prevent single pole insertion.