Description

This Standard specifies general safety requirements for approval and test purposes for bell and chime transformers.

This Standard is the formal adopting document of IEC 61558-2-8 Ed 2 which has been adopted without national variation.

Scope

The IEC text, which is not included, deals with the safety of bell and chime transformers and power supply units incorporating bell and chime transformers.

Transformers incorporating electronic circuits are also covered by this standard. Includes electrical, thermal and mechanical aspects.

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 also applies 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.