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8 rules for creepage distance and clearance2 K c- {; E; q% q
# c7 h s; T6 j' U7 m( n/ x' O4 m1. A groove may have parallel, converging or diverging sides.
4 Z1 ]* X8 l7 {- p2 x2. 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.1 }& v" }+ A' \+ Z y
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.8 {4 v( j( B0 n. p1 @
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 .
+ l a, N8 i5 X# |2 H6 @& W5. 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+ i1 G) ~! L: e1 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.
; R% w. }, M' e" A( v5 V' x% t4 e9 N" f7. A computed creepage distance is never less than a measured clearance.% K+ x6 Y( C$ ]4 j8 v. E* w% ~
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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