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|  DSH 506
( [* Q" j+ W' e: f5 M% H+ b9 d5 V9 r5 ]; H7 s
| Creepage distances, clearances and distances through insulation: }3 a( N+ k9 L, E5 ]
| 29.2
# I+ |) k- |9 i: Z" t9 Q | 60335-1(ed.3)3 C H L7 S6 T! ^! w" W
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+ | m, l3 Y4 f, o+ f
Question:/ H* R) ?: Y9 |' L8 ]4 g+ R H H
What creepage and clearance distances apply across parts of same polarity when a cut out
2 p; y7 T* e( R _* H% i& X' Aoperates during clause 19?
' x0 i) Z( m! ^1 G$ T0 bRationale:' v7 E% R$ {9 ^* E+ n; ?
See question.; ^2 a" ~8 k7 I" d1 [4 z9 M: I
Decision:7 T; j6 N# g T5 ^% k
In this situation the live parts of thermal cut out in the open position are considered as parts
2 D# E# x/ t) W# _* zof different polarity.
! M8 M7 h$ B$ c9 c( e" HWhen measuring creepage and clearance, the distances should be checked according to the
7 \9 M! @" T) D" n1 ucomponent standard. If the cut out does not operate for all the tests of all clauses, the3 b- c9 ~; S1 r, l$ s9 L& v
distances are not measured because there is no open circuit and no parts of different polarity." N$ F1 M3 l# b2 G
1 Q4 J+ P; x4 N) O) f0 K& ~" z
0 E/ Q" U8 b$ }0 p% ]% D& D |
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发表于 2012-9-9 17:44
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