Most recent
IEC 61310-2 Ed. 2.0 b:2007
"Safety of machinery - Indication, marking and actuation - Part 2: Requirements for marking"
"It gives general rules on marking for identification of machinery, for safe use related to mechanical and electrical hazards, and for the avoidance of hazards arising from incorrect connections. Includes the following significant technical changes with respect to the previous edition: Annex A: additional safety signs included and updated. "
International Electrotechnical Commission [iec]