2014UNE-EN 60947-6-1:2006/A1:2014 Low-voltage switchgear and controlgear - Part 6-1: Multiple function equipment - Transfer switching equipment
2006UNE-EN 60947-6-1:2006 Low-voltage switchgear and controlgear -- Part 6-1: Multiple function equipment - Transfer switching equipment (IEC 60947-6-1:2005)