Table
5.27.Indicative onshore cable lengths
Electrical infrastructure
HVDC cable FO cable
Number 2 x 37km 1 x 37km
Minimum Case
Total Length 74km 37km
Number 4 x 37km 2 x 37km
Maximum case
Total Length 158km 74km
323. The East Anglia THREE cables would follow the East Anglia ONE onshore cable route from the landfall to the substation at Bramford. Cables would be installed to a maximumof 1.5m below ground level. Each project would have up to four cables in up to two trenches. Under Scenario 2 therefore there would be four trenches in total; two for East Anglia THREE cables and two for East Anglia FOUR ducts.
5.6.2.2 Jointing Pits and Kiosks 324. As the onshore cabling is typically supplied on drums of up to 1,000m in length, jointing pits would be required along the cable route to join each section of the cable together.
325. The precise location of the jointing pits would be determined during post-consent detailed design; however wherever practical the jointing pits would be located at the edge of field boundaries or roads to allow future access. Therefore under both Scenarios, jointing pits will be constructed for each project at the time of cable installation (i.e. if ducts are installed for a future project, jointing pits will not be installed for that project at the same time).
326. The following sections would first describe the open-trenching technique and requirements and then the use of pre-installed ducts would be described. In addition, there are some elements common to both scenarios which would then be discussed.
327. At the vicinity of the jointing pits each pair of cables would have a kiosk to provide access for testing and maintenance. These may be required at each jointing pit location (i.e. at 61 locations for Scenario 1 and 48 locations for Scenario 2) therefore there would be a maximum of 122 or 96 kiosks along the onshore cable route. Each kiosk would be 1m x 0.75m x 1m high.
5.6.3 Construction Methods for Scenario 1: pre-installed ducts 328. Scenario 1 assumes that during the construction of East Anglia ONE the following are undertaken:
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 5 Description of the Development Page 72
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