1. IEC 60309-4:2012 Plugs, socket-outlets and couplers for industrial purposes – Part 4: Switched socket-outlets and connectors with or without interlock

2. IEC 60255-121:2014 Measuring relays and protection equipment - Part 121: Functional requirements for distance protection

3. IEC 60255-127:2010 Measuring relays and protection equipment - Part 127: Functional requirements for overunder voltage protection

4. IEC 60255-149:2013 Measuring relays and protection equipment - Part 149: Functional requirements for thermal electrical relays

5. IEC 60255-151:2009 Measuring relays and protection equipment - Part 151: Functional requirements for over-under current protection

6. IEC 60255-26:2013 Measuring relays and protection equipment - Part 26: Electromagnetic compatibility requirements

7. IEC 60255-27:2013 Measuring relays and protection equipment - Part 27: Product safety requirements

8. IEC 60258:1968/AMD1:1976 Amendment 1 - Direct acting recording electrical measuring instruments and their accessories

9. IEC 60258:1968 Direct acting recording electrical measuring instruments and their accessories

10. IEC 60261:1989 Sealing test for pressurized waveguide tubing and assemblies