Ehv cable installation

Care is to be taken to prevent cable from dragging. Before Cable Pulling 1 It shall be confirmed that trench floor or other places where the cable is to be installed are free from any foreign materials such as stones, nails and pieces of concrete, asphalt, brick pieces, glass pieces, sharp-edged objects etc. Such materials should be removed at least 30 cm away from the trench.

Any water inside the trench should be pumped out completely. The trench wall must be secured appropriately in accordance with specification prescribed by the client. The cable trench curves must be checked thoroughly, to ensure that the minimum bending radius of the cable is attained. Sweet sand or backfill soil as required by project specifications shall be evenly distributed on the trench floor with minimum thickness of mm or to a thickness prescribed in the project specifications.

Upon completion of the test heat shrinkable end caps, to protect against ingress of water or foreign particles, must immediately seal the exposed area. Whenever a cable is cut, the exposed end shall be sealed to protect from rain, mist or dripping or splashed water by heat shrinkable caps.

The drum should be mounted on transport and laying trailer. For cable pulling, the cable drum shall be set at the opposite direction to the arrow painted on the drum that indicates the direction of rolling during transportation. Care should be taken not to damage the cable by battens when removing them from the cable drum. The direction of pulling should be so chosen so as to require the least pulling strength at the end of the cable path.

The equipment to be used should be of proven reliability and should be thoroughly tested before cable installation begins. Ensure that the winch has a pulling recorder and a tension meter, to continuously monitor the cable pulling force. It should not exceed the maximum pulling force of the cable recommended by Ravin. The meeting prior to cable pulling is recommended to decide position of watchmen with communicative equipment to guide cable pulling works.

Watchmen shall be positioned every 50 metres and at every corner. Swivel shall be installed between wire rope and pulling eye to prevent the cable from twisting. At the entrance to the cable trench, a cable guiding and bearer stand is positioned, over which the cable taken off the cable drum is pulled into the trench.

The rollers that are inclined towards the centre ensure that the cable is fed centrally into the trench. The cable rollers in straight portions shall be set at approximately 2 metre intervals to avoid the slack of the cable pulling.

Whereas the cable rollers in bend portions shall be set as close as possible, so as not to be subjected to the sidewall pressures partially. Sufficient numbers of corner cable rollers are positioned on the curves in the trench, to prevent cable sliding off.

In field practice anchor pins have proved ideal for anchoring the corner rollers. And it shall be confirmed that trench will not collapse at any portion along the cable route. The pulling speed shall be reduced at corners, inlets of duct, etc. After confirming that no damage has occurred at these portions, the pulling tension may be increased. We have specialist cable handing equipment for use at our storage depot and for transporting cable drums to and from site.

We have dedicated secure facilities for the safe storage of cables and drums at our operational depot in Salford. We can provide full turnkey cable system designs and technical assessments which include: Cable ratings and cable system options Cable system potential mechanical forces calculations Oil filled hydraulic designs Cable pulling tension and side wall pressure calculations Temporary works Safe working practice technical assessments to NSI5 or equivalent Steel support structures and special constructions Project Management Our project managers are all highly experienced in EHV cable installation, jointing and terminations and for the planning, procurement, supervising and delivery of projects on time and with a responsibility for ensuring safety, high quality and value for money.

Our jointing service includes: XLPe cable systems Self-contained oil filled cable systems MIND cable systems Cable fault locations Leak detection oil filled cables Cable Testing We provide specialist cable technicians and engineers to undertake cable testing in accordance with appropriate recommended procedures.

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These are the pharmaceutical stocks with the best value, fastest growth, and most momentum for Q1 Dow Futures 36, Nasdaq Futures 15, Use mandrels with a diameter 6 mm less than the duct size to check for breaks or sharp edges in the duct that would damage the cable. On completion of inspection, put the guide rope by blowing in to the pipe and connect to the winch pulling rope.

Each duct should be provided with a draw wire and both ends of the duct should be plugged in a proper manner to prevent ingress of any foreign material like soil, sand, concrete, water etc. Only winch pulling shall be applied for cable duct installation.

The cabling winch rope is coupled to the cable by means of pulling eye. The pulling tension should not exceed the maximum permissible pulling tension recommended by Ravin in their technical data.

Lubrications of Cable The use of cable lubricants, as the cables are pulled into ducts lessens the cable tensions and prevents any scratching of cable jackets due to irregularities in ducts. A liberal use of lubricant is recommended for all pulling operations. Petroleum-based lubricant shall never be used for any formation with polyethylene jackets.

The lubricant is usually applied to the cable as the cable enters the duct or the feeding tube. The bending corners of the cable tunnel should also be designed to provide the permissible bending radius to the cable with enough margins. When cables are laid on cable racks or cable supports, they shall then be fixed with cable cleats or clamps at adequate intervals to absorb the thermal expansion and contraction with their lateral or vertical movement within the length between adjacent cleats.

If cables are laid without any binding, they may move according to the thermal behaviour and may drop from the rack or supports. Further, the metal sheath of the cable may be subjected to excessive strain at bent portions where the thermal movement of the cable is partially concentrated. In order to avoid this movement, snake installation i. At the end of the cable route, the cable ends should be set straight and fixed with cable clamps before rising to the sealing ends.

Special care must be taken to lay cables at such locations. It is not possible to list all counter measures to cope with and cover every special construction; however, following are generally recognised as the basic key points that should be taken into account:.

Cables must also be provided adequate protection against direct solar radiation. CABLE LAYING Most adequate method should be adopted to pull the cable considering site conditions, so as to avoid any damage to the cable due to excessive mechanical forces experienced during cable installation and to ensure an efficient installation.

It must be ensured that the cable to be installed can be pulled without any damage or defect in terms of cable pulling design according to route drawings and site conditions.

Pulling cables over rollers :? If cables are to be pulled through long plastic pipes, it is essential that a lubricant be used. Otherwise, the heating produced as a result of friction between the cable and the plastic surface could cause the thermoplastic sheathing to stick to pipe walls.

On slopes up to approximately 20 deg. This examination should also include lagging, reel flanges and reel marking, tags and labels. While handling cables, necessary precaution should be taken to prevent damage to the cables.