DSH 587 Transformer intened to supply power to a saftey extra low voltage circui

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DSH 587 * u1 U" Y. e1 N, |! S; d: A7 V ; Z3 _. Q, d3 t3 n: U3 v7 O- W

Transformer intened to supply power to a saftey extra low voltage circuit (SELV) 0 i  m& z6 I1 ?9 O0 u

24.1 ' k: i" z" R! P( Z. W

60730-1(ed.3);am1 - r) I; b5 e# H0 `( H

Question:
Sub-clause 24.1 prescribes that “Transformers intended to supply power to a safety extra-low voltage
circuit (SELV) shall be of the safety isolating type and shall comply with the relevant requirements of
% |1 j0 \% v6 A- Z6 JIEC 61558-2-6.”.
1 L  l" A! ?- _* GThis prescription does not allow the use of other types of transformers not covered by IEC 61558-2-6.
* x2 H" k; {- J- }In case of testing of an electronic control with an integrated switch mode power supply (SMPS)
. B& g' J, L) t  ]. O. Zintended to supply power to a safety extra low voltage circuit (SELV), what requirements shall be
applied?
Decision:
4 p8 }- [  L  EThe transformer shall comply with the relevant requirements of IEC 61558-2-17 for safety relating
transformers.
The entire switch mode power supply circuit (with the exception of the transformer) shall fulfil the
' p* I! ^- Y3 V6 Nrequirements of IEC 60730-1 and relevant Annex H.

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