• Madalpingelised elektripaigaldised. Osa 4-42, Kaitseviisid. Kaitse kuumustoime eest [Võrguteavik] = Low-voltage electrical installations. Part 4-42, Protection for safety. Protection against thermal effects (IEC 60364-4-4 2:2010, modified + IEC 60364-4-42:2010/A1:2014)2015 http://www.ester.ee/record=b4484094*est