SAFETY OF POWER TRANSFORMERS, POWER SUPPLY UNITS AND SIMILAR - PART 2-4: PARTICULAR REQUIREMENTS FOR ISOLATING TRANSFORMERS FOR GENERAL USE (IEC 61558-2-4:1997, IDT)
This Malaysian Standard applies to stationary or portable, single-phase or polyphase, air-cooled isolating transformers, associated or otherwise, having a rated supply voltage not exceeding 1000 V a.c. and rated frequency not exceeding 500 Hz, the rated output not exceeding:
– 25 kVA for single-phase transformers;
– 40 kVA for polyphase transformers.
This standard is also applicable to isolating transformers without limitation of the rated output, however such transformers are considered as special transformers and are subjected to an agreement between the purchaser and the supplier. The no-load output voltage or the rated output voltage does not exceed 500 V a.c. or 708 V ripple-free d.c.
NOTES
1. The no-load output voltage or the rated output voltage may be up to 1000 V a.c. or 1 415 V ripple-free d.c. to be in accordance with the national wiring rules or for a special purpose.
2. This standard is applicable to those isolating transformers used when the installation rules ca
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