This part of IEC 60255 is applicable to measuring relays and protection equipment for power
system protection, including the control, monitoring and process interface equipment used
with those systems.
This standard specifies the essential requirements for electromagnetic compatibility for
measuring relays and protection equipment intended to be used at industrial locations.
Measuring relays and protection equipment used in substations and power plants may require
higher immunity test levels.
For equipment not incorporating electronic circuits, for example electromechanical relays,
tests according to this standard are not required.
The requirements specified in this standard are applicable to measuring relays and protection
equipment in a new condition and all tests specified are type tests only.