DSH 511 Creepage distances, clearances and distances through insulation

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IEC60335试验指甲

DSH 511 4 Q; }0 D" G$ W1 o, T

Creepage distances, clearances and distances through insulation ' b' @+ W6 X2 Y* `

29.2

60335-1(ed.3)

! o& w2 `, X& Q2 d4 W5 n6 sQuestion:
' z5 |" _. d6 {5 G* PThe requirement of IEC 60742 for distance through insulation between primary and
8 Q5 }5 T% l' }secondary winding is 1 mm. According to IEC 60335-1:1991, if the secondary winding is
) H1 w9 e; U% w: Y* q$ \accessible there is requirement for 2 mm for distance through insulation of primary and
secondary 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
0 f6 |  m) n- O. S" c6 mif the standard is not very clear regarding the sub-clause of annex R.
& D8 s0 \3 C! V$ y/ pRationale:
See question.
; R. u$ \6 ^% @Decision:
The transformer standard is applicable.