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|  DSH 506
2 I# y# X; {. P/ i+ m. D2 o
/ v/ A4 ]( z T) L" Z | Creepage distances, clearances and distances through insulation2 _( O3 L" S- v
| 29.2
% q- J' D# R+ d: v' R0 M. X | 60335-1(ed.3)$ l$ d, O3 H, y. |1 f) y
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! z" F0 s: b: p) @ m' ^
Question:
* k$ p7 V) l5 Y" v, i& [ S* r9 n) N3 TWhat creepage and clearance distances apply across parts of same polarity when a cut out- y4 o' Z1 K9 b) d2 `/ F
operates during clause 19?
# e2 M4 S/ y6 R0 v6 q: ]% VRationale:
+ Z# m9 Q& T4 c0 S0 G: b8 n5 _' M6 zSee question.
, q& m1 l5 C1 K1 t# hDecision:
) B3 O" S& E3 t8 F. m2 a2 G0 XIn this situation the live parts of thermal cut out in the open position are considered as parts4 A0 F6 p6 A9 ^ Y4 W, E
of different polarity.
1 m; B) \0 {4 E1 e: H, FWhen measuring creepage and clearance, the distances should be checked according to the
" F- F0 U5 B8 t: ~component standard. If the cut out does not operate for all the tests of all clauses, the) {) X1 i. b5 V
distances are not measured because there is no open circuit and no parts of different polarity.
6 H( p$ m# m3 h6 h# @* C3 S( H0 j7 L* P) p$ S, R) g* v/ N
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发表于 2012-9-9 17:44
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