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tangxianyu 发表于 2012-10-30 15:32 4 S f! _' a0 Q, P' j4 X* f# u
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 B8 I* c4 @1 q6 pCTI>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);
# _, N! J- P+ s C+ D多層板內部距離被認為是Solid insulation,經受住如下測試就OK.& Q- G9 _7 r* i) ?
7.3.7.8.2 Requirements for electrical withstand capability of solid insulation8 z8 @6 O& {8 p9 Z/ p
7.3.7.8.2.1 Basic, supplemental, reinforced, and double insulation2 b5 z& N7 x' f
Solid insulation shall withstand the applicable impulse withstand voltage test according to$ ?! n ~. g6 L5 L& D" S! h
7.5.1 and the a.c. or d.c. voltage test according to 7.5.2.$ h; A1 J, n! A
In addition, double and reinforced insulation shall withstand the partial discharge test
) {% L( G2 e1 _+ s# y% faccording to 7.5.3, if the recurring peak working voltage across the insulation is greater than- G! R# Z1 v4 F2 Y( c( h) V. E$ e
700 V and the voltage stress on the insulation is greater than 1 kV/mm. |
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