Historical
IEC 60255-27 Ed. 1.0 b:2005
Measuring relays and protection equipment - Part 27: Product safety requirements
Describes the product safety requirements for measuring relays and protection equipment having a rated a.c. voltage up to 1 000 V with a rated frequency up to 65 Hz, or a rated d.c. voltage up to 1 500 V. Details essential safety requirements to minimize the risk of fire and hazards caused by electric shock or injury to the user.
International Electrotechnical Commission [iec]