IEC 60989 Ed. 1.0 b:1991

Applicable to stationary or portable, single-phase or polyphase, air-cooled separating transformers, autotransformers, variable transformers and small reactors, associated or not, having a rated supply voltage not exceeding 1 000 V a.c., a rated no-load or load output voltage not exceeding 15 kV a.c. or d.c. and a rated output not exceeding: - single-phase transformers: 1 kVA - single-phase reactors: 2 kVAR - polyphase transformers: 5 kVA - polyphase reactors: 10 kVAR. Has the status of a group safety publication.