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tangxianyu 发表于 2012-10-30 15:32
9 T8 Z" ^1 V5 h) e" X+ h3 k不是看不明白,是我和认证公司的工程师有分歧。他说那个PWB指的是板子内部的距离,例如双层版的top layer ... 7 ?2 @+ b6 b, v) W5 M+ [
CTI>175的PWB才可以Column 3來判定(有UL認可的PWB的CTI值大多在175以上);
9 o0 B- ]: Q# \; S& f多層板內部距離被認為是Solid insulation,經受住如下測試就OK.
* M; i& f) M& H3 _$ W& ?7.3.7.8.2 Requirements for electrical withstand capability of solid insulation
4 p8 J0 G$ f4 V/ S& D7.3.7.8.2.1 Basic, supplemental, reinforced, and double insulation% Y; {$ ~/ m' Z D# M& o3 z3 f
Solid insulation shall withstand the applicable impulse withstand voltage test according to5 {/ u+ c% S2 j( p* C2 ?! V
7.5.1 and the a.c. or d.c. voltage test according to 7.5.2./ X# r3 X1 q. Z- Y6 j( a
In addition, double and reinforced insulation shall withstand the partial discharge test; F& ~6 }& i+ m* l6 K# x. c1 q9 N& m
according to 7.5.3, if the recurring peak working voltage across the insulation is greater than
3 e" T8 R3 C; H% r700 V and the voltage stress on the insulation is greater than 1 kV/mm. |
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