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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.
0 k8 B# }' q& ]6 ] u2 a2. 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.
% |% w6 r' V/ N3. 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., f* l% G1 q: {4 H i
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 .) ~3 g1 h, J3 J1 m1 S6 T
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.. J* O5 a; I) Q
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., e0 W/ y( j+ b7 `2 z
7. A computed creepage distance is never less than a measured clearance.' L7 A1 g P4 O- {. I' q
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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