SAFETY OF POWER TRANSFORMERS, POWER SUPPLY UNITS AND SIMILAR - PART 2-1: PARTICULAR REQUIREMENTS FOR SEPARATING TRANSFORMERS FOR GENERAL USE (IEC 61558-2-1:1997, IDT)
This Malaysian Standard applies to stationary or portable, single-phase or polyphase, aircooled separating transformers, associated or not, having a rated supply voltage not exceeding 1000 V a.c., a rated frequency not exceeding 500 Hz, and a rated output not exceeding:
– 1 kVA for single-phase transformers;
– 5 kVA for polyphase transformers.
This Malaysian Standard is also applicable to separating transformers having a rating up to 40 kVA, 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 shall not exceed 1000 V a.c. or 1415 V ripple-free d.c.
This standard applies to transformers where double or reinforced insulation between circuits is not required by the installation rules or by the appliance specification.
NOTE:
1.Normally, the transformers are intended to be associated with equipment to provide voltages different from the supply
