Common Cable Laying Method Which Cable Laying Method is Used in Generating Station?
Common Cable Laying Method Which Cable Laying Method is Used in Generating Station?
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What is cable laying? Generally, cable laying refers to the way the cable is routed from the distribution box to the electrical equipment or another distribution box. For example, concealed laying along the ground, along the wall, along the top plate, open laying, cable trough, cable trough, etc. all commonly used cable laying method. Choose the appropriate cable laying method according to different environments, conditions, and properties. So what are the common cable laying method? Power cable laying generally divided into three categories: underground laying, underwater laying, and open laying. Underground laying is the most common, and the laying methods include direct burial laying, pipe laying, top pipe laying, cable trench laying, and tunnel laying. Underwater laying is laying on the seabed and the bottom of rivers and lakes. Open laying is overhead laying and bridge laying. The most common laying methods are direct burial laying, pipe laying, cable trench laying, and tunnel laying. The above methods have their own advantages and disadvantages. The choice of laying method should considered from aspects. Such as urban planning, existing building density, cable line length, number of cables, surrounding environmental impact, and project budget.
1.Direct burial cablelaying
(1) Selection of direct burial route
- Areas with strong acid and alkali corrosion or serious electrochemical corrosion caused by stray current should avoided.
- In the absence of protective measures, areas with termite damage, heat sources and areas susceptible to external damage should be avoided.
(2) Regulations that direct burial cable should comply with
- Cables should laid in trenches, and soft soil or sand layers with a thickness of not less than 100 mm should laid on the upper and lower sides of the entire length of the cable.
- The entire length of the cable should covered with protective plates with a width of not less than 50 mm on both sides of the cable. The protective plates should made of concrete.
- When direct burial cables laid in urban areas. Conspicuous marking strips should laid on the upper layer of the protective plates.
- In suburban areas or open areas, obvious azimuth signs or stakes should be erected at intervals of 100 m along the straight line of the cable route, at turns or joints.
- When cables laid in trenches through corrugated pipes. Plain concrete with a thickness of not less than 100 mm should poured along the entire length of the top of the corrugated pipe. The width should not be less than 50 mm from the outside of the pipe. The cable may not contain armor.
2.Underwater cable laying
(1) Selection of underwater laying routes
- Cables should laid in areas with stable riverbeds, slow flow, banks that are not easily washed away, no obstacles. Such as rocks or sunken ships on the seabed, and few anchors and trawlers.
- Cables should not laid near docks, ferries, hydraulic structures, or in dredging areas or planned port areas.
(2) Regulations that should be followed when laying cables underwater
- Underwater cables should not suspended in the water and should buried in the water. In navigable waterways and other waters where external mechanical damage must prevented. Cables should buried in trenches of appropriate depth in the water. They should also covered and protected securely. The burial depth in shallow waters should not be less than 0.5m, and the burial depth in deep water channels should not be less than 2m.
- Underwater cables strictly prohibited from crossing or overlapping. Adjacent cables should maintain a sufficient safety distance.
- For the section where the underwater cable is led to the shore, protective measures suitable for the laying conditions should be taken.