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|  DSH 506
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1 U1 A' }' W" o0 @& B0 k3 A | Creepage distances, clearances and distances through insulation4 P; c: O7 g# a2 i5 b2 t, _0 L
| 29.2. E( E, Q+ D$ M, i- _
| 60335-1(ed.3)% w4 f- y B; }% t" y8 J% h Y
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Question:+ x8 v* L3 f. S. D2 E% [. X% h
What creepage and clearance distances apply across parts of same polarity when a cut out& D/ T+ E/ F8 D/ j4 a' L2 w, _
operates during clause 19?
% n- s n6 z: `5 YRationale:
3 [ L: C. J) z) I gSee question.+ T) Z7 `" X7 O7 x, x) N/ G8 \
Decision:
$ C; W% q$ d% G; m5 U1 BIn this situation the live parts of thermal cut out in the open position are considered as parts! q( J7 U& i" w1 }
of different polarity.+ c" w1 H4 q1 A+ r! R7 `, x
When measuring creepage and clearance, the distances should be checked according to the* q* r4 I5 g: c) U J
component standard. If the cut out does not operate for all the tests of all clauses, the% x- l2 S' _, @$ S' i
distances are not measured because there is no open circuit and no parts of different polarity.
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发表于 2012-9-9 17:44
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