This Malaysian Standard applies to associated power transformers for switch mode power supplies, single-phase or polyphase, air-cooled:
– separating transformers;
– isolating transformers;
– safety isolating transformers,
having a rated supply voltage not exceeding 1000 V a.c. and a rated frequency of 500 Hz to 1 MHz, the rated output not exceeding:
– 10 kVA for single-phase transformers;
– 16 kVA for polyphase transformers.
NOTE 1 – For higher frequencies, this standard may be used as a guide.
The no-load output voltage or the rated output voltage do not exceed:
– 1000 V a.c. or 1 415 V ripple-free d.c for separating transformers;
– 500 V a.c. or 708 V ripple-free d.c for isolating transformers.
NOTE 2 – For isolating transformers, the rated output voltage may be up to 1000 V a.c. or 1415 V ripple-free d.c. in accordance with the national wiring rules or designed for special purposes.
– 50 V a.c. r.m.s. and/or 120 V ripple-free d.c for safety isolating transformers.
T