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There are well defined ISA naming rules for process equipment (sensors, indicators, transmitters, etc.) and associated signals (output, input, alarms, etc.). There are other types of equipment that do not fit (as far as I know) in these definitions, such as motor protective relays, power meters and many others that generally match the definition of IED (Intelligent Electronic Device). I'm looking for any formal code or good practice used to name this type of equipment and associated signals.