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8 rules for creepage distance and clearance. j6 Z. S9 A, k" i
9 p( F5 f) N1 s2 w9 w) v B0 H
1. A groove may have parallel, converging or diverging sides.+ h2 W; i, Q. Y
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.8 T* m6 F% L6 ^0 V0 [0 j
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.
( L) X) r9 h' l( U4. 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" b: w0 C! l( x% T. E
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.
0 A, q1 C& D [1 b8 t$ M( p' o6. Creepage distances and clearances measured between parts moving relative to each other are measured when these parts are in their most unfavourable stationary positions.
0 f* u. s3 b' Y* _7. A computed creepage distance is never less than a measured clearance., a. g1 B7 W, ^" P1 ^( }
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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