DSH 511 Creepage distances, clearances and distances through insulation

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DSH 511 5 L  ]) \1 f/ D1 r4 J7 t

Creepage distances, clearances and distances through insulation . k. |6 r- m) {& P

29.2

60335-1(ed.3) 6 d7 V! N, ~$ y  W, K/ {8 J

2 L. F) ^3 O$ t& B4 |4 z4 E( vQuestion:
The requirement of IEC 60742 for distance through insulation between primary and
2 p" E) w( U( S) `4 k8 {secondary winding is 1 mm. According to IEC 60335-1:1991, if the secondary winding is
accessible there is requirement for 2 mm for distance through insulation of primary and
) l4 A4 `1 v4 H; b  T& {" Hsecondary winding. In general the delegates agreed unanimously that in this case
. B% y4 t4 }6 U8 Vtransformers are accepted when tested or certified according to IEC 60742 or annex R, even
if the standard is not very clear regarding the sub-clause of annex R.
Rationale:
0 I$ W3 r! c' |! S" j$ GSee question.
Decision:
" l. ]% q7 Z+ r5 N8 CThe transformer standard is applicable.
0 A- d, N, K/ @" A

! @* ^$ C9 q( K8 t# v8 {