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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.5 t" z- O+ t3 i, c$ Q( }
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.5 j, s9 |5 E6 q) x' E
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.' B, B5 ?0 R* I2 X5 q
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 .
6 G- G1 V0 L! D: [+ I5. A creepage path is assumed not to exist if there is an air gap as defined in item 2 above exceeding 0,25 mm.
! \* {1 T2 S+ m3 h$ `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.
P1 j: b6 w9 x: b7 S0 b7 i7. A computed creepage distance is never less than a measured clearance.
3 b; k# `4 ?, ^* s8. 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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