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8 rules for creepage distance and clearance8 P. p+ {* ]0 X7 C9 }
+ D: J2 s# r3 O7 c0 m+ v' F1. A groove may have parallel, converging or diverging sides.
! U! n; h k7 G( Q2. 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.1 y( {* V- G. j4 |
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. }* D* v. @. I o. @3 b
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 .- l; G9 B6 Q$ m. ^# t
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.9 U( R. x2 j8 {; ^- j+ R; f6 l
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.
5 T! d9 P6 b2 B( g9 Q7 ^& d2 O7. A computed creepage distance is never less than a measured clearance.
9 J& m+ L6 X' p( H C8. 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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