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8 rules for creepage distance and clearance
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1. A groove may have parallel, converging or diverging sides.
( Y; i# j( y' P* g7 F& y T1 m2. 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.0 E9 ?- P, l/ a; o! z/ Q5 V6 A# M( @
3. 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.& o2 Q6 M9 N4 k9 Y3 y
4. 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 .
' G t* a! ~1 ?3 Y5. A creepage path is assumed not to exist if there is an air gap as defined in item 2 above exceeding 0,25 mm.
+ a( C+ c; U" K6. Creepage distances and clearances measured between parts moving relative to each other are measured when these parts are in their most unfavourable stationary positions.
* x \. Q! Z9 ^* y! t' E% v0 v7. A computed creepage distance is never less than a measured clearance.
% R1 p( G# W. b5 {* g2 L6 ]8. 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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