IEC 61326-2-6:2012-Electrical equipment for measurement, IEC 60947-8:2003+AMD1:2006 CSV-Low-voltage switchgear and controlgear-Part 8: Control units for built-in thermal protection (PTC) for rotating electrical machines, IEC 60641-3-1:2008-Pressboard and presspaper for electrical purposes-Part 3: Specifications for individual materials-Sheet 1: Req