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

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DSH 587

Transformer intened to supply power to a saftey extra low voltage circuit (SELV) / g1 M$ a. x' A. ~

24.1 0 ~0 C  P, p, C9 l: Y% Y0 ]

60730-1(ed.3);am1 ) j" [7 l) w% l% A  z

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 F, y8 ?. j0 o: kIEC 61558-2-6.”.
5 o" Z3 L/ O( L& o3 Z! [4 _0 LThis prescription does not allow the use of other types of transformers not covered by IEC 61558-2-6.
0 {0 S1 {0 X+ v' c$ w' @In case of testing of an electronic control with an integrated switch mode power supply (SMPS)
: Q4 A# k: I3 x1 ~) N% O/ R/ O+ mintended to supply power to a safety extra low voltage circuit (SELV), what requirements shall be
8 C+ o) V) i1 q% W* q. }/ q! Y+ Yapplied?
# ?5 y; E# l1 }  n2 E0 F3 c1 uDecision:
# S' X4 Z9 q8 wThe transformer shall comply with the relevant requirements of IEC 61558-2-17 for safety relating
transformers.
0 n5 S+ `# R" d9 kThe entire switch mode power supply circuit (with the exception of the transformer) shall fulfil the
requirements of IEC 60730-1 and relevant Annex H.
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