1. When keeping
The newly purchased cable in a tube is sealed with plastic sealing sleeves at both ends, but after a period of use, the rest is wrapped with plastic paper and tied with a rope on the outside. cable.
2. When laying cables
When the cable is laid, the cable head wrapped with plastic paper is sometimes immersed in water, allowing water to enter the cable; sometimes the outer sheath is broken when pulling and passing through the tube.
3. After laying
After laying, the cable head is not made in time, so that the unsealed cable port is exposed to the air for a long time, or even immersed in water, so that a large amount of water vapor enters the cable.
4. When making the cable head
When the cable head is made (including the terminal head and the intermediate joint), due to the intention of the manufacturer, the cable end sometimes slides into the cable well with accumulated water.
5. When the cable is running
During the operation of the cable, when a fault such as the breakdown of the intermediate joint occurs, the accumulated water in the cable well will enter the cable along the gap; on the construction site, the cable will be damaged or broken due to external force, and the cable will also enter the water.