1, At the following locations, cables should have protective tubes with certain mechanical strength or protective covers installed:
1. Cable entering buildings, tunnels, passing through floors and walls;
2. The section leading from the ditch to the surface of the electric pole, equipment, wall, or easily accessible to pedestrians inside the house, with a height of less than 2 meters from the ground;
3. There may be load-bearing equipment moving through the section above the cable;
4. Other areas where mechanical damage may occur.
2, There should be no accumulated water inside the pipeline and no debris blocking it. When threading cables, the protective layer must not be damaged, and non corrosive lubricants (powder) can be used.
3, Before laying cables, cable ducts should be unblocked and debris removed.
4, The number of cables penetrating the pipe should meet the design requirements; Single core communication cables shall not be separately threaded into steel pipes.
1, The arrangement of cables should meet the following requirements:
1. Power cables and control cables should not be installed on the same layer of support;
2. High and low voltage power cables, as well as strong and weak current control cables, should be arranged in layers in order, and generally should be arranged from top to bottom; But when introducing high-voltage cables above 35kV into the cabinet, in order to meet the bending radius requirements, they can be configured from top to bottom.
2, When laying power cables in parallel, the clear distance between them should meet the design requirements.
3, The laying of cables on brackets should meet the following requirements:
1. The control cable should not exceed one layer on a regular bracket; The bridge should not exceed 3 layers;
2. Three core power cables for communication should not exceed one layer on a regular bracket; The bridge should not exceed 2 layers.
3. Single core power cables for communication should be arranged on the same side bracket and fixed. When arranged in close proximity to an equilateral triangle, ties should be used every certain distance to prevent looseness.
4, The net distance between cables, thermal pipelines, and thermal equipment should not be less than 1m when parallel, and not less than 0.5m when crossed; When restricted by conditions, insulation protection measures should be taken. The cable channel should avoid the fire holes of the boiler and the explosion-proof doors of the powder making system; When restricted by conditions, insulation and fire prevention measures such as threading pipes or sealing grooves should be taken. Cables should not be laid parallel to the upper part of thermal equipment and pipelines.
5, Cables with hemp protective layer laid indoors, in cable trenches, tunnels, and vertical shafts should be stripped of the hemp protective layer and their armor should be protected against corrosion.
6, After the cable laying is completed, debris should be promptly removed and the cover plate should be covered. If necessary, the gaps in the cover plate should also be sealed.
