to back-fill the trenches after installation. If it is not suitable, it would be disposed of at a suitable facility and replaced with selected material that does possess the required thermal properties. The soil would be checked to ensure it is free from sharp stones that could cause cable damage.
364.
The onshore cables would be laid in sections, with the section length dependent on the feasibility of handling the cable drums and cable route design. Laying cables in an open trench involves pulling the cables off their drum via a winch positioned at the end of a section and rollers to guide the cables. For cable laying through farmland, the cable must be laid sufficiently deep to prevent any interference from ploughing.
365. While the cable trenches are open, where required they would be fenced off for health and safety reasons, and security firms would be employed as required. After the cables have been pulled into the trenches, the trenches would be back-filled.
366. Concrete cable protection tiles would be fitted above the cables in each trench, featuring indented lettering warning of the danger of electricity below. Between the protection tiles and the ground surface would be plastic warning tape containing text alerting future excavators to the danger of the cables below.
5.6.4.5 Cable Delivery 367. Cables would be delivered in drums, with the cable lengths on the drums being specified during design and procurement phases.
368. Where possible, cable drums would be delivered directly to the construction site from the factory. Alternatively they could be stored in an intermediate storage facility until required.
369. Upon arrival at site, the drums would be offloaded onto a hard standing. A mobile crane would be necessary for offloading.
5.6.4.6 Cable Pulling and Installation 370. Cables would be delivered to Construction Consolidation Compounds (CCS) for temporary storage. From there, the cables would be taken by tractor and cable drum trailer to jointing pits for pulling operations. Pulling operations would be carried out within the working width of the corridor.
371. Once the trench was completed a cable pulling system would be installed into the trench. Typically this would comprise a steel bond and winching system, with free spinning cable rollers placed along the bottom of the trench. Other cable pulling
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 5 Description of the Development Page 80
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