DANSK DS/EN 61558-2-7 PDF

This part of 61558 deals with safety aspects of transformers for toys and power supplies incorporating transformers for toys such as electrical, thermal and mechanical safety. This Part 2-7 is applicable to transformers for toys and power supplies incorporating both transformers for toys and electronic circuits. This Part 2-7 is not applicable to external circuits and their components intended to be connected to the input terminals, output terminals or socket-outlets of the transformers and power supplies. This Part 2-7 applies to stationary and portable, single-phase, air-cooled (natural or forced), transformers for toys and power supplies incorporating transformers for toys, having a rated supply voltage not exceeding 250 V a.c., a rated supply and internal operating frequency not exceeding 500 Hz, a rated output not exceeding 200 VA and a rated output current not exceeding 10 A. This Part 2-7 is applicable to independent transformers and transformers for specific use. This Part 2-7 is applicable to dry-type transformers for toys. The windings may be encapsulated or non-encapsulated. The no-load output voltage does not exceed 33 V a.c. for transformers for toys and power supplies incorporating transformers for toys, or 46 V ripple-free d.c. for power supplies incorporating transformers for toys, and the rated output voltage does not exceed 24 V a.c. for transformers and power supplies, or 33 V ripple-free d.c. for power supplies. In general, this Part 2-7 does not take into consideration children playing with the transformers for toys and power supplies incorporating transformers for toys. NOTE 1 – Attention is drawn to the following: – for transformers for toys and power supplies incorporating transformers for toys intended to be used in vehicles, on board ships, and aircraft, additional requirements (from other applicable standards, national rules, etc.) may be necessary; – measures to protect the enclosure and the components inside the enclosure against external influences such as fungus, vermin, termites, solar-radiation, and icing should also be considered; – the different conditions for transportation, storage, and operation of the transformers for toys and power supplies incorporating transformers for toys should also be considered; – additional requirements in accordance with other appropriate standards and national rules may be applicable to transformers for toys and power supplies incorporating transformers for toys intended for use in special environments, such as tropical environments. NOTE 2 – Future technological development of transformers and power supplies may necessitate a need to increase the upper limit of the frequencies; until then, this Part 2-7 may be used as a guidance document.