Direct acting indicating analogue electrical measuring instruments and their accessories - Part 8: Special requirements for accessories (IEC 60051-8:2017) (english version)
This part of IEC 60051 applies to accessories as defined in 3.1.20 of IEC 60051-1:2016.
ICS
17.220.20 Measurement. Including measuring instruments, instrument transformers / Измерения электрических и магнитных величин. Включая измерительные приборы, измерительные трансформаторы