This Malaysian Standard deals with all aspects of safety such as electrical, thermal and mechanical.
This standard applies to stationary or portable, single-phase or polyphase, aircooled (natural or forced), independent or associated auto-transformers, having a rated supply voltage not exceeding 1 000 V a.c., a rated frequency not exceeding 500 Hz. The core power does not exceed:
– 1 kVA for single-phase auto-transformers;
– 5 kVA for polyphase auto-transformers.
The rated output does not exceed:
– 20 kVA for single-phase auto-transformers;
– 100 kVA for polyphase auto-transformers.
This standard is also applicable to auto-transformers having a core power up to 40 kVA, however such transformers are considered as special transformers and are subjected to an agreement between the purchaser and the supplier. Such special auto-transformers have no limitation for the rated output. The no-load output voltage and the rated output voltage do not exceed 1 000 V a.c.
or 1 415 V ripple-