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EVS-EN 50341-2-20:2015 Elektriõhuliinid vahelduvpingega üle 1 kV. Osa 2-20, Eesti riiklikud erinõuded (SEN) = Overhead electrical lines exceeding AC 1 kV. Part 2-20, National Normative Aspects (NNA) for Estonia (based on EN 50341-1:2012)
Author: Peeter Raesaar, Eesti Standardikeskus, Compiler: Tiit Metusala, Juhan Karin, Väino Milt, Tõnu Müürsepp, Toomas Raudsepp, Mati Roosnurm, Harri Vihman