|
|
8 rules for creepage distance and clearance
0 M* Y1 g8 {5 s! J( c/ M/ u# X
3 l, W8 q5 e& l3 x K' Y1 B1. A groove may have parallel, converging or diverging sides.* s& x0 g6 d9 e* z% F- w- Q
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.
) g9 T ?5 k; l: g3. 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.
% u- N, C1 x; o: R& Z. s4. 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 .
6 m1 ~( p" H7 V! r" V5 l/ B5. A creepage path is assumed not to exist if there is an air gap as defined in item 2 above exceeding 0,25 mm.
! c) k u7 z+ F, i, f& 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. C$ y" M5 k% ^3 o& m9 L! G# q
7. A computed creepage distance is never less than a measured clearance." f# A" e# o4 c; z
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