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|
|  DSH 511
) \) J" y+ S) }( j7 |6 F3 M9 V7 ?( o4 Q2 B6 g) @
| Creepage distances, clearances and distances through insulation0 W5 a4 f3 m, Z4 N! D- h6 _
| 29.2, y: l( ]* u+ A( t& A! a/ s
| 60335-1(ed.3)
, \' P& L0 w( K K/ b |
% _; B% F9 l- J
Question:
7 a( I" L- l, F" ]3 L* IThe requirement of IEC 60742 for distance through insulation between primary and- k: y) B: q" y. H
secondary winding is 1 mm. According to IEC 60335-1:1991, if the secondary winding is
; o) n; e; B: K' q3 eaccessible there is requirement for 2 mm for distance through insulation of primary and
1 C7 A! F" X; osecondary winding. In general the delegates agreed unanimously that in this case* C+ W/ l8 B" m* h
transformers are accepted when tested or certified according to IEC 60742 or annex R, even0 v% _3 q1 _0 h9 h5 Q
if the standard is not very clear regarding the sub-clause of annex R.# x, U; x7 e: Y' O: w3 f
Rationale:3 a) F, W2 O, P, S+ X$ \
See question.$ @5 u! |$ n: L+ h, g8 N, Q
Decision:
' T; ~( {$ j" [& N2 c- L! q5 TThe transformer standard is applicable.
: N* U- W9 A" ?6 G( H! k4 }5 F! S, ], Z8 J: s+ a# w
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发表于 2012-9-9 17:02
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