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tangxianyu 发表于 2012-10-30 15:32 
0 M* x1 j+ H' m" Z: 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 ... 3 y* Y, k' H; `5 a/ `0 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);3 t3 k: T8 J0 Z$ }2 u8 ^+ f
多層板內部距離被認為是Solid insulation,經受住如下測試就OK.; s9 N# z3 s; K. l+ G3 W
7.3.7.8.2 Requirements for electrical withstand capability of solid insulation
! v4 }" y1 Y, z1 _7.3.7.8.2.1 Basic, supplemental, reinforced, and double insulation% D4 }: Y. H; L6 K: p* `
Solid insulation shall withstand the applicable impulse withstand voltage test according to x# x1 G: R3 |2 L3 F8 I: m1 Q3 l
7.5.1 and the a.c. or d.c. voltage test according to 7.5.2." m" {: d v. U @' _* p; H- x! K
In addition, double and reinforced insulation shall withstand the partial discharge test
6 V8 c" o' ^: _! s/ ~; d/ X- `: c2 Gaccording to 7.5.3, if the recurring peak working voltage across the insulation is greater than
0 ?& o. p- G: @# _( j700 V and the voltage stress on the insulation is greater than 1 kV/mm. |
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