Student problem: is the general requirement for the cable terminal head and the intermediate joint?

[answer]:

(1) the conductor is well connected. For terminal, cable conductor must connect well with outlet and outlet nose. For intermediate connection, cable core must be connected well with connecting pipe. The resistance of the contact point is small and stable. Compared with the same length of the same section conductor, the value of the new cable terminal and intermediate joint is less than 1. The ratio between the terminal and the middle end of the running cable should be no more than 1.2.

(2) the insulation is reliable. It is necessary to have insulation structures that can meet the long-term safe operation of cable lines in various states. The insulation materials used should not be accelerated under operation conditions, resulting in the reduction of electrical strength of insulation.

(3) well sealed. The structure should effectively prevent the invasion of external water and harmful substances into the insulation, and prevent the insulation agent from losing outwards, so as to avoid "breathing" phenomenon and maintain air tightness.

(4) there is enough mechanical strength. It can adapt to various operating conditions and can bear the mechanical stress on the cable line.

(5) direct current (or AC) withstand voltage test which can withstand the standard of electrical equipment switching test.

The above contents are arranged according to the problems encountered in the actual work of the students, for reference, if there are problems, please communicate and correct them in time.