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8 rules for creepage distance and clearance2 g# T% v: ~5 H
) [. e: i6 g" W C1. A groove may have parallel, converging or diverging sides.. p6 E% m3 l. }. ~7 h& E- G
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.
z7 M! C, S% B b5 P3. 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.
! D5 e& x( z" [- y$ t4 p# N7 m% 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 .& L4 R" f1 m" D
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.) v/ ]- D7 {! 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.
6 {1 v2 }: t+ ^0 v" }7. A computed creepage distance is never less than a measured clearance.
% C: R0 ?: _3 e, S/ _7 B8. 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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