1999NF C79-139:1999 Safety of machinery. Electrical equipment of machines. Part 31 : particular requirements for sewing machines, units and systems.
1992NF C79-131:1992 ELECTRICAL EQUIPMENT OF INDUSTRIAL MACHINES. PART 3 : PARTICULAR REQUIRMENTS FOR SEWING MACHINES,UNITS AND SYSTEMS. (EUROPEAN STANDARD EN 60 204-3-1).