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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。8 Q9 ^, S% d& I
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) Z7 \! F3 f5 t% t1 b7 [
pollution degree 2: only non-conductive pollution occurs, except that occasionally a8 a: @6 ?+ E' P$ }; }. o
temporary conductivity caused by condensation is to be expected;& l! o1 I! I' |: m: o- t" K/ z
pollution degree 3: conductive pollution occurs or dry non-conductive pollution occurs that
# M9 e4 g, b6 Q# N8 ~( Zbecomes conductive due to condensation that is to be expected;
7 G) m: u; P; W. I2 A; z; IPTC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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