BOQ and Specifications for 11-kV Overhead Line (1.5km, Coastal, 350A, 300mm²)

We are currently using an underground supply of 11 kV with 300mm2, 3-core cable for transmission with 350A breaker on HT side for a span of nearly 7km. Now we want to alter a portion of that line which is about 1.5km to 11-kV overhead transmission line. Kindly guide me which type of conductor, insulator, poles height, span b/w poles, arrangement of conductor on poles etc practically BOQ for said job(we r working near sea so kindly take consideration for insulation failure due to moisture content)

I dont know to much in this area but at least you get a link:

http://electricalproducts.cellpack.com/filead...loge/Kataloge_en/Katalog_MS_EN_2013_DINA4.pdf

http://www.bruggcables.com/site/index.cfm/id_art/43444/vsprache/EN

Possibly you could contact this companies for further information

Other possible providers of products and related information:

http://www.pfisterer.co.uk/download.php?coc=10&dkat=3

http://www.nexans.de/eservice/navigation/NavigationPage.nx?navigationId=-21