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8 rules for creepage distance and clearance
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9 }6 u; x) C1 d, h1. A groove may have parallel, converging or diverging sides.8 K q* z h& o: }4 b
2. Any groove having diverging sides, a minimum width exceeding 0,25 mm, a depth exceeding 1,5 mm and a width at the bottom equal to or greater than 1 mm, is regarded as an air gap.
8 G. H1 \& C# G: C& x6 l6 k3. Any corner including an angle less than 80° is assumed to be bridged with an insulating link of 1 mm width (0,25 mm for dirt-free situations) moved into the most unfavourable position.
# B6 e9 Q, @* {* N/ G4. Where the distance across the top of a groove is 1 mm (0,25 mm for dirt-free situations) or more, no creepage distance exists across the air space .) a- H4 I9 f* s3 l7 l: a/ q U
5. A creepage path is assumed not to exist if there is an air gap as defined in item 2 above exceeding 0,25 mm.
0 \% }1 A' a' K' ~: g5 k" j6. Creepage distances and clearances measured between parts moving relative to each other are measured when these parts are in their most unfavourable stationary positions.- X8 W5 @( F4 H9 v& Z: f2 b9 ]: m+ x
7. A computed creepage distance is never less than a measured clearance.
, [% a! ?) W6 V6 s4 g, Y% d9 G8. Any air gap less than 1 mm wide (0,25 mm for dirt-free situations) is ignored in computing the total clearance. |
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发表于 2011-7-12 14:26
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