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CENELEC EN 50341-2-22   2022   Overhead electrical lines exceeding AC 1 kV Part 2-22: National Normative Aspects (NNA) for Poland (based on EN 50341-1:2012) 30 $
CENELEC EN 50341-2-22   2016   Overhead electrical lines exceeding AC 1 kV - Part 2-22: National Normative Aspects (NNA) for Poland 20 $