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tangxianyu 发表于 2012-10-30 15:32 
' L9 S) n8 z. D3 W% r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 ...
- {6 H: j1 n5 {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);
* G1 D# r, T" f Y多層板內部距離被認為是Solid insulation,經受住如下測試就OK.1 `9 c5 R9 A L; I/ r. K6 ~( G" ~
7.3.7.8.2 Requirements for electrical withstand capability of solid insulation5 n, o% q% e* d5 ^ k
7.3.7.8.2.1 Basic, supplemental, reinforced, and double insulation4 L- [& {1 k+ z! J# ]8 V- Z x
Solid insulation shall withstand the applicable impulse withstand voltage test according to4 k* v2 {) B( N. L
7.5.1 and the a.c. or d.c. voltage test according to 7.5.2.7 y" p5 n0 L( D. B( J
In addition, double and reinforced insulation shall withstand the partial discharge test# l. ^; d, j. u% f1 a
according to 7.5.3, if the recurring peak working voltage across the insulation is greater than
% ?1 M- e% e+ [700 V and the voltage stress on the insulation is greater than 1 kV/mm. |
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