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8 rules for creepage distance and clearance1 t5 h- ?# y7 m( |% ^% g
3 ]7 p: ^' X* L! W% G# N9 I1. A groove may have parallel, converging or diverging sides.9 X, m# ?/ e+ X8 O' \; }
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.
/ L7 p4 }5 q1 h! J6 X3. 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.
0 T: x, J0 v6 d0 j1 }3 z: L4. 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 ." z/ `; s. b# }9 S% \% R" `
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.( ~( f0 Z2 t' Q& _+ h+ U
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.
% B% T. ^3 j, j5 f0 G4 `! Q1 a8 `7. A computed creepage distance is never less than a measured clearance.# J4 Z- I* ` ?0 Q* W5 x
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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