Cable laying method for Road Crossing and Utility Service Crossing using uPVC Typical cable laying detail for low tension single cable, direct buried and. A trench of about meters deep and 45 cm wide is dug. Then the trench is covered with a 10 cm thick layer of fine sand. The cable is laid over the sand bed. The sand bed protects the cable from the moisture from the ground. cables. The installation company responsible for laying the cables must heed the .. procedure, forces of tension result, which, depending on the type of cable.
|Published:||27 July 2015|
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Advantages Simpler and cheaper than the other two methods Heat generated in cables is easily dissipated in the ground. Disadvantages To install new cables for fulfilling an increased load demandcompletely new excavation has to be done which costs as much as the new cable laying procedure.
Alterations in the cable network are not easy. Maintenance cost is higher.
Typical Cable Laying Detail For Direct Buried, Low Tension Cables |
Identifying the location of a fault is difficult. This method can cable laying procedure be used in congested areas such as metro cities where excavation is too expensive.
Types of underground cables ] Draw-in system In this method, cast iron or concrete pipes or ducts are laid underground with manholes at suitable positions along the cable route. The cables are then pulled into the cable laying procedure from the manholes.
Distance between the manholes should be such that pulling in the cables is easier.
Laying of underground cables |
At corners or while changing the direction of route, radius of the corners must be longer. The cables that are to be laid in this way need not be armoured but must be provided with the serving of hessian and jute in order to protect them when being pulled.
Advantages Repairs, additions or alterations to the cable network can be easily made from manholes without re-excavation. The invert levels of all pipes or ducts entering a building shall cable laying procedure such that the pipes or ducts cable laying procedure away from the building. Should the pipe or duct entry into a building be below the water table puddle flanges shall be incorporated.
Laying of underground cables
Where cables are laid direct in the ground 75mm of sand or riddled earth shall be placed at the bottom of the trench to form a bed for the cables. When the cables have cable laying procedure laid they shall be inspected and accepted by the Engineer.
Protective covers shall be placed centrally over the cables, each cover being closely butt jointed and interlocked with the adjacent covers throughout the length of the cable.
No cable laying procedure filling in of trenches shall be commenced until the Engineer has accepted the placing of the protective covers.
Subsea Cables – Installation Procedures and Methods | KIS-ORCA
After any cable has been laid and until the whole of the cables to be laid in the trench have been covered with protective covers, no sharp tools or other appliances shall be used in the trench or left in such positions that might result in damage cable laying procedure the cables if they fell into the trench.
Any rollers used for the cable laying operation shall be free from all sharp projections liable to cause damage to the cables. The Contractor shall be cable laying procedure responsible for ascertaining whether the soil is chemically active and for taking special precautions to protect the cables against chemical action.
The arrangement of cables, all methods of laying and installation shall be agreed with the Engineer, which shall be planned to provide an orderly formation, free from unnecessary bends and crossings, permitting the removal of any one cable without undue disturbance to adjacent cables. Where ducts have been laid the Contractor shall ensure that they have been ridden and cleaned to remove all foreign matter before the cables are drawn in.
After cables have been laid in accordance with requirements specified the trenches shall cable laying procedure filled in by the Contractor and the refilled trench cable laying procedure be left and maintained in a thoroughly safe condition until the work of permanent reinstatement is carried out.
Cable ducts shall be internally glazed vitrified clay with plastic flexible sleeve joints or PVC or pitch fibre type. Even though the Desk Top Study has identified the cable laying procedure route, the Route Cable laying procedure will confirm the assumptions made. The Route Survey comprises: Collection of Bathymetry, geotechnical, sub-bottom and side scan data to support route engineering, cable selection, installation and burial.