Is the cable conductor detected by the cable nose in accordance with the national standard

The AAC Cable nose is often used for the end connection and continuation of the cable, which can make the connection between the cable and electrical appliances more firm and safer. Cable companies often receive customer complaints: with the corresponding specifications of the wire nose through the corresponding specifications of the conductor, found that the wire nose is larger than the outer diameter of the cable conductor! If it is suspected that the cable is a non-standard product, let the cable enterprise send someone to explain and deal with it on site immediately; In particular, with the use of “special-shaped wire stranded cable conductor and its production method” by cable enterprises, the compression coefficient of cable conductor has increased from 0.90 to more than 0.98, and the outer diameter of cable conductor has decreased by more than 5%. In this way, cable users worry about whether the cable is non-standard or wrong cable specification after receiving the goods? Today, I want to explain to you: why is the cable nose larger than the outer diameter of the cable conductor?

The reason why the cable nose is larger than the outer diameter of the cable conductor is mainly to reduce the contact resistance of the connection and strengthen the local heat dissipation capacity. For a cable, the resistance of the whole length is evenly distributed, but no matter how much pressure you use to install the connection of the cable nose, the resistance of the contact part is always greater than that of the non connection part of the cable, resulting in serious local heating, The solution is to increase the contact area and reduce the contact resistance. At the same time, the larger the nose, its heat dissipation capacity will be higher. Generally, the area of the cable nose is 30-50% larger than the corresponding specification of the cable conductor, because the cable conductor is sometimes rolled into a fan or tile shape, which is not a pure circle. Generally, it needs to be compressed by a hydraulic press and then turned into a circle. If the inner hole of the cable nose is designed according to the nominal outer diameter of the cable conductor, some special-shaped conductors cannot be penetrated.

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