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8 rules for creepage distance and clearance
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9 P6 n. R) B1 s7 C1. A groove may have parallel, converging or diverging sides.
, M1 `5 Z- D' O! `6 s2. 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.
3 v( z2 \( S: y1 @' L: {: q0 b3. 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.
) r. a" d9 N2 m% b8 a4. 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 .9 q: V$ N4 l+ V" a
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.3 E" b+ }" E6 P9 B, n' M* \
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.
0 c( ]7 V* k# M7. A computed creepage distance is never less than a measured clearance.( b. J* [) `4 Q$ Z% a
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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