|
|
8 rules for creepage distance and clearance) J+ w2 I4 u8 G4 j
8 @) Z+ V. u! L7 ]# ~% ?. Z2 i
1. A groove may have parallel, converging or diverging sides.
3 B+ l7 `. O5 Z2. 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 v. J( R2 U% R+ {+ ^$ L( f3. 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.8 Z/ ~0 ~' R; }! N) x0 ~
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 .
- ^) `9 K* m' u+ ~6 r% z A% S3 V5. A creepage path is assumed not to exist if there is an air gap as defined in item 2 above exceeding 0,25 mm.
5 @/ @' k7 f) N7 o6. Creepage distances and clearances measured between parts moving relative to each other are measured when these parts are in their most unfavourable stationary positions.
, ^( q. J: C1 j- P6 i7 v7. A computed creepage distance is never less than a measured clearance.
0 {) k* B; s& z- [/ C C1 b8. Any air gap less than 1 mm wide (0,25 mm for dirt-free situations) is ignored in computing the total clearance. |
|
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 )
窥视卡
雷达卡
发表于 2011-7-12 14:26
显身卡
楼主