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|  DSH 5115 T/ F0 v* ^0 f) g/ G$ F
6 c7 C$ G/ d6 k | Creepage distances, clearances and distances through insulation* c2 z; c" `1 X) s
| 29.2! w1 _ K7 ]3 J" R4 [
| 60335-1(ed.3)- C1 |+ r" ~8 y1 F; i" A% }
|
* \% N9 a) O! T O: Q8 CQuestion:7 Z* v h& T; d. V! Y
The requirement of IEC 60742 for distance through insulation between primary and$ e: K) t4 _0 c( c' a' d( H
secondary winding is 1 mm. According to IEC 60335-1:1991, if the secondary winding is* y( A0 O2 C; ` F0 |
accessible there is requirement for 2 mm for distance through insulation of primary and6 P3 F4 L1 U: w+ B
secondary winding. In general the delegates agreed unanimously that in this case
8 b+ v! j" S$ W: z6 g Z; Btransformers are accepted when tested or certified according to IEC 60742 or annex R, even
: I# p/ E. H; a' j* H/ Eif the standard is not very clear regarding the sub-clause of annex R.
, j- X; d! P! g6 w+ d& {Rationale:
% K) U; U& d7 |) E7 @) ESee question.
" M V* @0 q3 h& e6 z7 iDecision:
Q9 `) ?! v; HThe transformer standard is applicable.
7 v2 D! m6 h) x. J5 t, U1 L& b! y, |7 Q5 e- i
; E5 R ?+ `% r5 n0 a8 w |
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发表于 2012-9-9 17:02
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