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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.
/ u) R; B& d' H2. 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.# {* ]" Z4 i$ u( k
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.
0 c0 y1 H4 Z$ e7 Q! k! e4. 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 .; ]' s. o) w& {/ Q+ y8 s X' \
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.% D" ^2 r+ V5 Q1 T7 B+ T3 Y9 y
6. Creepage distances and clearances measured between parts moving relative to each other are measured when these parts are in their most unfavourable stationary positions.7 c1 z8 q3 k. j* E3 w
7. A computed creepage distance is never less than a measured clearance.
8 V* P+ S' Q% C- o" ]( F) X+ w0 I$ M8. 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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