As an indispensable connection in daily life, the internal structure of the national standard power cord plug is not very complex, but it can not be seen through at once. If the power cord is properly decomposed, there is still a need for professional understanding. Conventional power line structure is mainly composed of outer sheath, inner sheath and inner core. Common inner core is made of copper and aluminum wire.
The outer sheath of power cord is also called protective sheath, which is the outermost sheath. This protective sheath plays the role of protecting power cord. It needs to have good characteristics, such as high temperature resistance, low temperature resistance, environmental protection of materials and so on. The inner sheath is an insulating sheath, which is an indispensable part of the GB power line plug. Insulation sheath means to be used for insulation, to protect the use of power lines, so that there will be no leakage between copper wire and air, and the material of insulation sheath should be soft.
Copper wire is the core part of the power line. Its main function is to act as the carrier of current and voltage. The density of copper wire directly affects the quality of power line. The quantity and softness of copper wire is an important factor of power line.
GB power line plugs also play an important role in household appliances. If the power cord is damaged, the electrical appliance will not be used or damaged. For household power lines, BVV2 x 2.5 and BVV2 x 1.5 models should be used. BVV is the national standard code, which is copper sheathed wire. 2 x 2.5 and 2 x 1.5 represent 2 cores 2.5 square millimeters and 2 cores 1.5 square millimeters, respectively. Under normal circumstances, 2 x 2.5 main line, trunk line, 2 * 1.5 to make a single electrical branch line, switch line. The single-phase air conditioning dedicated line is BVV2 * 4, with special ground wire.