Notes 1, 2 and 3 are normative in Austria:NOTE 2 The construction of lines with covered conductors (KUF) and reduced internal or externalclearance is permitted in Austria.NOTE 4 This NNA applies to overhead lines with nominal voltage exceeding AC 1kV up to and includingAC 45 kV and a maximum operating voltage of 52 kV according to ÖVE EN 60071-1. Hereinafter the latterwill be described as high voltage overhead lines, group I.