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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.
: D$ D- {, e+ m% h8 U2 x6 {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.
9 v1 D. U7 }8 l5 d: o5 I$ t3. 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.% I: L/ C/ Y+ A$ ~3 {
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 .( n1 `% o$ ~( ]7 [/ P
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.2 ~/ O/ y- ~ S9 Y/ m4 [1 D9 A
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. ~- L% T$ f* B% U8 M
7. A computed creepage distance is never less than a measured clearance.
7 q& r6 ? \, ~- G8. 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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