CENELEC - EN 60255-27
Measuring relays and protection equipment Part 27: Product safety requirements
|Publication Date:||1 December 2005|
|ICS Code (Relays):||29.120.70|
Scope and object
This International Standard 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. Above these limits, IEC 60664-1 should be used for the determination of clearance, creepage distance and withstand test voltage.
This standard details essential safety requirements to minimize the risk of fire and hazards caused by electric shock or injury to the user.
This standard does not cover the safety requirements of installations. It does cover all the ways in which the equipment may be mounted and used in cubicles, racks and panels, and also re-testing. This standard also applies to auxiliary devices such as shunts, series resistors, transformers, etc., solely used and tested together with measuring relays and protection equipment.
Ancillary equipment used in conjunction with measuring relays and protection equipment may need to comply with additional safety requirements.
This standard is intended to describe only product safety requirements; therefore, functional performance of the equipment is not covered.
Functional safety requirements, including EMC functional safety, are not covered by this standard. Functional safety risk analysis is not within the scope of this product safety standard.
This standard does not specify individual equipments or implementations of circuits and components.
The object of this standard is to have a comprehensive standard that covers all aspects of product safety and the related type and routine tests, for measuring relays and protection equipment.