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8 rules for creepage distance and clearance+ H- x/ j$ T7 {- ?$ H8 d3 s+ m
u% d; i* k& v9 [8 @) @1. A groove may have parallel, converging or diverging sides.- y5 ]: O6 @. B% q: v6 `
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.
4 s6 F+ m6 G F. g3. 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.
t" g# j/ L8 A6 p1 N. W- |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 .
. \( ^* J) \5 T( y8 k) N& q4 q5. A creepage path is assumed not to exist if there is an air gap as defined in item 2 above exceeding 0,25 mm.
% R* T2 g& B0 c2 p$ P6. Creepage distances and clearances measured between parts moving relative to each other are measured when these parts are in their most unfavourable stationary positions.) |- L% V( w; G7 {
7. A computed creepage distance is never less than a measured clearance.
% P) i r5 Y, J1 V/ [9 k6 R8 b6 l8. 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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