It widened its scope to include high-voltage (HV) applications, covering systems above
It dictates the "rules of the game" for safety, including requirements for earthing of enclosures and protection against dangerous voltages. iec 618691 pdf
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If you're not sure which part of IEC 61869 you need: iec 618691 pdf
IEC 61869-1 applies to newly manufactured instrument transformers designed for use in electrical power systems with frequencies from 15 Hz to 100 Hz. It covers equipment intended for both indoor and outdoor applications.
Understanding IEC 61869-1: The Foundation for Modern Instrument Transformers
