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楼主 |
发表于 2008-7-18 10:52
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PTC是属于半导体性质的,是会导电的,所以tracking试验不适用,所以只能按最差的3B了。
$ a/ u1 S/ a# @4 g0 u/ ^如果按照污染等级2的确就没这个问题了,但是我们是按照P3考核
& T7 n1 z- [, t% P4 j6 Kpollution degree 2: only non-conductive pollution occurs, except that occasionally a, a- u# H2 S# P' I; t
temporary conductivity caused by condensation is to be expected;
( b, e5 l' ]: z' `( S" H2 Rpollution degree 3: conductive pollution occurs or dry non-conductive pollution occurs that+ B2 e' V5 T* @1 n- f7 f
becomes conductive due to condensation that is to be expected;
% J6 \" w0 P" ^' F0 j6 I' Z1 `PTC是暴露在空气中的(灰尘颗粒算导电的还是不导电的?),我觉得还是算作P3比较合理。 |
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