This international standard deals with all aspects of safety such as electrical, thermal and mechanical. This part 2-8 of IEC 1558 is applicable to fixed, single phase air cooled (natural or forced), independant or sosociated safety isolating transformers for bell and chimes, having a rated supply voltage not exceeding 250V a.c., a rated frequency not exceeding 500 Hz, a rated output voltage not exceeding 100 VA. The no-load output voltage shall not exceed 33 V a.c. or 46 V ripple free d.c. and the rated output voltage shall not exceed 24 V a.c. or 33 V ripple free d.c. Bell and chime transformers are generally intended to supply domestic sound signalling equipment and other similar devices where the load is applied for short periods of time. This standard applies to special safety isolating transformers (transformer for bell and chime) which are used where double or reinforced insulation between circuits is required by the installation rules or by the appliance specification. This standard is applicable to dry-type transformers. The windings may be encapsulated or non-encapsulated. This standard is also applicable to transformers incorporating electronic circuits. This standard does not apply to external circuits and their components intended to be connected to the input and output terminals or socket-outlets of the transformer. Generally intended to supply domestic sound signalling equipment and other devices where the load is applied for short periods of time.
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