Acoustics. Determination of sound power levels of noise sources using sound pressure. Engineering method in an essentially free field over a reflecting plane— 40 стр.
High-voltage switchgear and controlgear. Voltage presence indicating systems for rated voltages above 1 kV and up to and including 52 kVkV and up to and including 52 kV— 26 стр.
BS EN 50488. Railway applications. Fixed Installations. Electrical protective measures for working on or near an overhead contact line system and/or its associated return circuit— 43 стр.
High-voltage switchgear and controlgear - Part 206: Voltage presence indicating systems for rated voltages above 1 kV and up to and including 52 kV (IEC 62271-206:2011) (english version)
