Current transformers for frequencies 14 Hz to 100 Hz for use with electrical measuring instruments and electrical protective devices. Ratings; accuracy; tests; rating-plate and terminal markings. Appendices on guidance in application of current transformers: short-time rating; maximum V A output of bar-primary and bushing current transformers; use of current transformers for dual purpose of measurement and protection, composite error, high and low reactance current transformers.

? British Standards Institution 2013

General notes:
This standard remained current until recently because it dealt with 'Class X' transformers. BS EN 60044-1:1999 (including amendments A1:2000 and A2:2003) deals with the 'Class PX' specification for transformers, which completely replaces Claxx X. Hence this standard has now been withdrawn.

BS 7626:1993

IEC 60185 Ed. 2.0 - Similar