5.6.4.8.4 Minor Roads 393. Minor roads can be crossed with ducts encased in concrete installed in open cut trenches at a depth of at least 1.2m under the road surface. One carriageway of the road would remain open during installation, with localised traffic management via signal controls. The detailed installation method for each road crossing would be agreed with the relevant highways authority for each case.
394. The only minor road crossed by HDD is Bramford Road which is crossed as part of the River Gipping and Great Eastern Railway HDD.
5.6.4.8.5 Major Roads 395. Major roads can be crossed with ducts pre-installed by HDD. Where the installation depth exceeds design installation depths it would be necessary to increase the spacing between circuits up to about 10m to achieve the necessary thermal independence between circuits to prevent cables from overheating. The detailed installation method for each road crossing would be agreed with the relevant highways authority for each case.
396. The major roads crossed by HDD are the A12 and A14.
5.6.4.8.6 Onshore pipelines 397. The detailed installation methods for each pipeline would be agreed with the pipeline operator for each case and would adhere to the safe working practices stipulated in the National Grid “Safe Working in the Vicinity of Transco High Pressure Gas Pipelines and Associated Installations”.
5.6.4.8.7 Public Rights of Way (PRoW) 398. Along its length, the onshore cable route would affect approximately 40 PRoW.
399. Whilst construction activities are taking place affecting a PRoW, the individual right of way would be subject to a temporary closure and diversions for approximately two weeks. After construction completion at each crossing, the PRoW would be restored to its former condition therefore reducing the duration of any impacts through embedded mitigation.
5.6.5 Cable Jointing and Jointing Pits 400. Cable jointing and jointing pits are required, regardless of the Scenario. However, the lengths of cable that can be pulled through ducts are smaller than those than can be pulled directly through trenches (as there is more resistance) and therefore a greater number of jointing locations are required with the use of pre-installed ducts.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 5 Description of the Development Page 84
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