Single-phase or polyphase air-cooled separating transformers, auto-transformers, variable transformers and small reactors having a supply voltage not exceeding 1000 V a.c. and rated frequency not exceeding 500 Hz.Cross References:BS 88:Section 2.1BS 89:Part 2BS 171:Part 4 BS 415BS 1362BS 1363BS 2011:Part 2. 1BBS 2757BS 3456:Part 201BS 3535:Part 1 BS 3939:Part 6BS 4265BS 4727:Part 1:Group 02 BS 5490BS 6746BS 6899PD 6499IEC 998HD 384-5-51 S 1HD 464 S 1
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