1. After the mineral insulated cable is cut off, the saw end should be temporarily sealed to prevent moisture and moisture from entering the insulation layer.
2. When the cable passes through the expansion joint or settlement joint of the building, an expander should be installed, that is, the cable should be set in an S shape to solve the expansion and contraction problem of the cable.
3. The copper sheath of the mineral insulated cable must be grounded, and the section and connection of the grounding wire should also meet the standard requirements, and one end should be grounded.
4. Test the resistance immediately after the joints of each cable are installed, and test again 24 hours after passing the test to check the sealing condition of the intermediate joints.
5. The protective layer of the single-core cable will produce weak eddy current phenomenon under the action of gate alternating current. In order to prevent the accumulation of eddy current when multiple cables are used, different arrangement and laying methods can be used to reduce the influence of eddy current.
6. When the cables are laid vertically along the bridge frame, they can be fixed by binding copper wires. The steel cable clips can only be used to fix the three phases of a single-core cable together, and cannot be used for fixing a single single-core cable.
7. During the cable laying process or after the laying installation is completed, it is strictly forbidden to drag or collide the live welding wire on the cable to prevent holes in the copper sheath of the cable and cause moisture in the air to be absorbed by the magnesium oxide insulation , leading to a decrease in the cable insulation resistance.
