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8 rules for creepage distance and clearance
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7 D1 p2 P) m* L1 s/ K+ H1. A groove may have parallel, converging or diverging sides.8 c8 m" ?: B: {, _* q6 L- Z
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.
4 r! x* R+ I2 g9 e3. 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.1 O7 m. [4 q9 R8 V, y
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 .* D2 g, O) W" M P& O7 i
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.
. h# N3 e& I, X! V% J5 ?$ A( A6. Creepage distances and clearances measured between parts moving relative to each other are measured when these parts are in their most unfavourable stationary positions.
* i) M5 Q! |6 A( I: D, i1 c4 v7. A computed creepage distance is never less than a measured clearance.; i' f0 \! D" E9 O
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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