Historical
IEC/TR 61496-4 Ed. 1.0 b:2007
Safety of machinery - Electro-sensitive protective equipment - Part 4: Particular requirements for equipment using vision based protective devices (VBPD)
"provides information related to the design, construction and testing of electro-sensitive protective equipment (ESPE) that employs vision-based protective devices (VBPDs) for the sensing function for the safeguarding of machinery. "
International Electrotechnical Commission [iec]