1. Regulations on the minimum allowable bending radius for cable laying:

1) Mobile flame-retardant flexible cable for coal mines: 6 times the diameter of the cable;

2) Fixed flame-retardant power cables for coal mines: armored cables are 15 times the diameter of the cable; Unarmored is 12 times.

2. Due to the difficulty in measuring the temperature of the conductor during cable operation, the temperature of the conductor is often determined by the surface temperature of the cable. The maximum surface temperature of cables used in various coal mines should generally not exceed 50 ℃.

3. Newly installed cables and cables with replaced joints should undergo insulation resistance testing, and cables in operation should undergo insulation resistance testing once every quarter.

4. The repaired cables should undergo a voltage withstand test. The cables in operation should undergo a preventive voltage withstand test once a year, and the power core of the cable should withstand the AC voltage test without breakdown. Effective protection should be carried out according to regulations during cable operation to prevent mechanical damage to the cable.

5. There should be a regular inspection and maintenance system during use, and it should be implemented effectively. The cables used for mobile devices should be supervised by dedicated personnel.

6. Strictly follow the regulations for cable connection.

7. The repair of cables should be strictly carried out in accordance with relevant coal industry standards.