|
|
8 rules for creepage distance and clearance
; K' \2 M; l$ \0 k: w
; ]* V4 J ]& p% i+ K4 _1. A groove may have parallel, converging or diverging sides.) T9 F7 N$ p; ?; o7 k
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.
% k# ~" E4 p) O/ r3. 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.# M' q- G$ u9 n3 e. z4 ^
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 .) ?; e% }: ~8 y* G9 C; J
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.
. Q C. d$ W7 B6. 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; D8 }% R: F
7. A computed creepage distance is never less than a measured clearance.. W3 F+ P, }9 ~
8. Any air gap less than 1 mm wide (0,25 mm for dirt-free situations) is ignored in computing the total clearance. |
|
/2 
|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