EN 60255-26 specifies the electromagnetic compatibility (EMC) requirements for measuring relays and protection equipment used in power system protection, control, and monitoring. The standard covers immunity requirements to ensure that devices can operate correctly in the presence of electromagnetic disturbances and emission requirements to limit the interference generated by these devices. It includes tests for radiated and conducted electromagnetic disturbances, electrostatic discharge, fast transients, surges, and power frequency magnetic fields. EN 60255-26 aims to ensure the reliable performance of protection relays and equipment in various environmental conditions found in power systems.