DSH 511 Creepage distances, clearances and distances through insulation

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DSH 511 ' N0 Y8 w" D: y2 L7 Y& p" e" j8 Z* P' k

Creepage distances, clearances and distances through insulation % q% `( e' Q7 C9 l/ ]& L3 s2 d

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60335-1(ed.3)

Question:
6 y, t1 l3 [9 R& r! QThe requirement of IEC 60742 for distance through insulation between primary and
# f* ^8 p7 \3 \' z0 Esecondary 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
/ G' o* ~3 L6 Tsecondary winding. In general the delegates agreed unanimously that in this case
transformers are accepted when tested or certified according to IEC 60742 or annex R, even
4 s0 Z: ^8 `0 k9 Q+ W6 ^2 `* qif the standard is not very clear regarding the sub-clause of annex R.
  S) H6 W9 L' i% ~) k. E4 vRationale:
1 y/ E6 B. x1 M3 r& DSee question.
Decision:
8 J7 ~$ [9 A. M" F; u! Y/ hThe transformer standard is applicable.

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