Maintenance Requirements For Metal Waterproof Cable Connectors

When the cable is being laid, there are many places where it is not continuous. At this time, in order to connect it into a whole section, a metal waterproof cable joint is needed. However, the joint can not only play the role of connection, but also has the functions of waterproof, dustproof and vibration proof. Therefore, once it is damaged, it will affect the normal use of the entire line. When there is a problem with the joint, what requirements need to be met during maintenance?

Nylon Cable Gland Maintenance requirements:

1. The selected heat shrink accessory material is very important. Generally, a blend composed of polyethylene, ethylene-vinyl acetate (EVA) and ethylene-propylene rubber needs to be selected as its material. This product is mainly used to deal with the problem of electric field stress concentration.

Its advantages are easy installation, affordable price, and good performance. In order to ensure the use effect of the heat shrink tube, its typical parameters should meet the specified requirements, that is, its volume resistivity should be moderate and the dielectric constant should be large.

The heat shrink tube needs to be used with silicone grease. Using silicone grease to fill the cable insulation semi-conductive layer can effectively isolate the air gap between the cable and the outlet to prevent moisture from entering.

2. Prefabricated accessories should use geometric structure method to deal with the problem of concentrated stress. Its advantage is that the material performance is excellent and can be installed without heating. Therefore, it is a more common form in high-voltage cables in recent years. However, there are requirements for the interference of the outer diameter of the cable insulation layer. Generally, the interference is required to be 2-5mm. If the interference is too large, the difficulty of installing the cable accessories will increase. If the interference is too small, the cable accessories will fail.