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tangxianyu 发表于 2012-10-30 15:32 9 |1 q/ c: b$ X2 I A
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 ... * H; D+ i/ w+ ^' D
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);1 q& C0 B$ d% O' V
多層板內部距離被認為是Solid insulation,經受住如下測試就OK.: Y4 E$ {2 a# a4 q8 v7 ^$ K3 s
7.3.7.8.2 Requirements for electrical withstand capability of solid insulation
5 R# Q0 o2 V' K$ C: d6 d7.3.7.8.2.1 Basic, supplemental, reinforced, and double insulation
( c8 |( D" U# L% D9 z1 dSolid insulation shall withstand the applicable impulse withstand voltage test according to1 G2 v6 {& m1 J9 l0 b
7.5.1 and the a.c. or d.c. voltage test according to 7.5.2.) C# L# ]! S% f. ^3 M( f
In addition, double and reinforced insulation shall withstand the partial discharge test) K- j7 G5 o! U7 h, W
according to 7.5.3, if the recurring peak working voltage across the insulation is greater than
1 L$ O. l+ I2 ], ]) W7 i, K0 {700 V and the voltage stress on the insulation is greater than 1 kV/mm. |
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