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标题: DSH 506 Creepage distances, clearances and distances through insulation [打印本页]
作者: 小米    时间: 2012-9-9 17:44
标题: DSH 506 Creepage distances, clearances and distances through insulation
DSH 506
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Creepage distances, clearances and distances through insulation* @! Y' l( D  ^2 x, u8 g$ ]7 Q' a
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8 T& B3 t7 ^  ?4 vQuestion:( ~, {; B- J! g% X, w
What creepage and clearance distances apply across parts of same polarity when a cut out
6 n/ Y/ H$ K( h1 Toperates during clause 19?
4 Y) c- N7 M" Y! Q" c" _6 |Rationale:
/ L% a+ N. r, G( S6 X7 kSee question.
6 m- I. @; q9 t, W4 ^+ g+ YDecision:# `9 a" O5 L( O- Z! ^5 a) S
In this situation the live parts of thermal cut out in the open position are considered as parts
, a* I% S/ R, B: zof different polarity.
3 \$ A+ U7 C! j$ WWhen measuring creepage and clearance, the distances should be checked according to the
" t0 u* G$ B$ W, L- gcomponent standard. If the cut out does not operate for all the tests of all clauses, the, W7 R" E: x* t. z/ Z1 J
distances are not measured because there is no open circuit and no parts of different polarity.5 m# g2 p' d) M, p9 ]4 W7 V0 Z

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