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8 rules for creepage distance and clearance
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1. A groove may have parallel, converging or diverging sides.
3 p+ S, S* z" a, `7 x2. 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# N5 `, k/ k! _' o% t; `3. 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. f1 J! c& X7 s- |
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 .
' g1 S* g% x# o$ U% x' Y5. A creepage path is assumed not to exist if there is an air gap as defined in item 2 above exceeding 0,25 mm.& I/ o/ k. P% y: l. o8 ~5 y
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., W5 W! g8 i n! ?
7. A computed creepage distance is never less than a measured clearance.# f! L' m6 ?( N7 `* @) ?4 B$ E
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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