The buried cable shall meet the following requirements:
(1) When the cable is under high pressure or there is a risk of mechanical damage, it should be reinforced or stripped.
(2) Cables should be steel wire armored in soils that may be displaced, such as drift sand layers and backfill land belts.
(3) When the termites are seriously hazardous and the plastic cable does not have a nylon jacket, metal sheathing or steel tape armoring can be used.
(4) can be used without armored outer sheath. Less than 6 35KV and below power cables with the same access point are used in long-distance support facilities or in cities and towns where the plant site is not easily excavated, and it is preferable to use direct burial; it is easier to renovate under urban sidewalks or on road edges. It can also be buried directly. Underground pipeline networks in the plant area may have sites where molten metal or high-temperature liquid overflows. Sites that are frequently excavated will not be directly buried. Cables that are exposed in areas with dangerous explosions should be exposed to cables that need to be protected on low pedestals. Crossings between underground cables and roads and railways should be done using pipes. Underground cables pass through sections of houses and plazas, and cables are laid in the sections where the plan will be used as roads. Pipes should be used. In the case of relatively dense underground pipe network factories, narrow urban roads, and heavy traffic or difficult road access, cables can be laid through pipes. In the case that there are a large number of underground cables in the factory area or building but no tunnels are used, cable trenches should be used in case of inconvenient excavation of the urban sidewalks and laying of cables in phases. When there is no protective measure, avoid the termite damage zones, the influence of heat sources and the sections that are easily damaged by external forces.
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