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8 rules for creepage distance and clearance: P$ O' B. [, `, y) z! q
2 _+ m3 R7 b3 E9 R1. A groove may have parallel, converging or diverging sides./ u4 G( L, H8 i- h
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.; R8 [( ?( d4 t
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.
2 x* C1 L n* P6 }. H; f$ w4 n3 \' y4 @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 .
2 T2 i/ f- g$ N8 h$ ^$ h5. A creepage path is assumed not to exist if there is an air gap as defined in item 2 above exceeding 0,25 mm.* D* A, w: z# q7 V& F, w& \" k3 z) n& 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.0 \/ G8 D* E/ M& R; Z
7. A computed creepage distance is never less than a measured clearance.
1 [7 t/ V4 d- d( z: ~7 x3 d8. 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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