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

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DSH 587 2 ]+ W$ u4 V8 L) P, z1 H: {8 S

Transformer intened to supply power to a saftey extra low voltage circuit (SELV) + N# S9 E4 B* u, _) o. ]5 O

24.1 " x: D- |! Q! K4 g9 |4 h, ], `$ X5 K

60730-1(ed.3);am1

Question:
Sub-clause 24.1 prescribes that “Transformers intended to supply power to a safety extra-low voltage
) s7 G" e1 j- j* M2 h8 B, z, ?circuit (SELV) shall be of the safety isolating type and shall comply with the relevant requirements of
IEC 61558-2-6.”.
8 t5 h/ ^- [, l0 w% lThis prescription does not allow the use of other types of transformers not covered by IEC 61558-2-6.
In case of testing of an electronic control with an integrated switch mode power supply (SMPS)
. m; X/ \; G' X2 _intended to supply power to a safety extra low voltage circuit (SELV), what requirements shall be
5 K# J& I/ E3 l( B. Sapplied?
2 w$ Q2 m5 W% aDecision:
, O' x4 Y# W& B) r8 G! J3 L* Y' qThe transformer shall comply with the relevant requirements of IEC 61558-2-17 for safety relating
transformers.
# H; O" s8 o) ~& ~1 q& t/ XThe entire switch mode power supply circuit (with the exception of the transformer) shall fulfil the
7 l' F# _9 ?+ g) o7 krequirements of IEC 60730-1 and relevant Annex H.


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