Safety of transformers, reactors, power supply units and combinations thereof - Particular requirements and tests for transformers and power supply units for bells and chimes Ingestion-build-228203 BS 3907-10 standard is a

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Safety of transformers, reactors, power supply units and combinations thereof - Particular requirements and tests for transformers and power supply units for bells and chimes Ingestion-build-228203 BS 3907-10 standard is a1 Scope Replacement: This part of IEC 61558 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. NOTE 1 Safety includes electrical, thermal and mechanical aspects. Unless otherwise specified, from here onward, the term transformer covers bell and chime transformers and power supply units incorporating bell