SIS SS 436 02 54-1980 Overhead line crossings — High voltage overhead line, max. 22 kV, above public road — Transformer and disconnector in crossing pole — Reinforced construction — Crossing sp?n safe for falling trees
1980SIS SS 436 02 54-1980 Overhead line crossings — High voltage overhead line, max. 22 kV, above public road — Transformer and disconnector in crossing pole — Reinforced construction — Crossing sp?n safe for falling trees