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

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DSH 587 8 l8 ^; q0 d' u6 i0 {

Transformer intened to supply power to a saftey extra low voltage circuit (SELV)

24.1 % d; o9 M! w- d5 O& i" S2 |

60730-1(ed.3);am1 ( M: q& i- L3 u+ a+ b* L% o

Question:
% t! t4 s2 e* ?* C& f( d* B% _Sub-clause 24.1 prescribes that “Transformers intended to supply power to a safety extra-low voltage
* b- v/ J. M$ w1 I. Y4 c/ jcircuit (SELV) shall be of the safety isolating type and shall comply with the relevant requirements of
, z8 Q: J' l4 T% b; t! h$ |IEC 61558-2-6.”.
This prescription does not allow the use of other types of transformers not covered by IEC 61558-2-6.
# |5 c! w' V( r) S+ kIn case of testing of an electronic control with an integrated switch mode power supply (SMPS)
intended to supply power to a safety extra low voltage circuit (SELV), what requirements shall be
1 \) @$ t* u9 Oapplied?
6 g; Q  ?: M5 A3 j+ W- m1 `4 pDecision:
  q  {2 c3 S& x4 s- z. R  @The 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
5 W2 }3 A  t0 p. `6 jrequirements of IEC 60730-1 and relevant Annex H.
' T' k6 K4 R' X1 v0 ~' F6 k  X% t% X, R

7 ^% b( d# A* u: w. M$ m* E" u