Measuring relays and protection equipment - Part 181: Functional requirements for frequency protection (IEC 60255-181:2019); German version EN IEC 60255-181:2019— 94 стр.
Thermal solar systems and components - Custom built systems - Part 5: Performance test methods for control equipment; German version EN 12977-5:2012— 46 стр.
Thermal solar systems and components - Custom built systems - Part 5: Performance test methods for control equipment; German version EN 12977-5:2018— 52 стр.
