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tangxianyu 发表于 2012-10-30 15:32
3 r Q! C/ J& N7 z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 ... $ s0 B9 M7 B/ o5 P) 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);
3 i/ l$ G8 e. g4 }( x3 h多層板內部距離被認為是Solid insulation,經受住如下測試就OK.
3 S9 [3 E" E& _6 b6 X$ A+ y' o# \7.3.7.8.2 Requirements for electrical withstand capability of solid insulation- i( ?- F8 X8 V2 {
7.3.7.8.2.1 Basic, supplemental, reinforced, and double insulation
+ A; t# k5 \+ b, e: U% k9 fSolid insulation shall withstand the applicable impulse withstand voltage test according to
2 p* u7 F% ]9 e) c: O' H2 [7.5.1 and the a.c. or d.c. voltage test according to 7.5.2.1 c0 X% j& O; J' i. n. g$ ^( g6 ~/ R
In addition, double and reinforced insulation shall withstand the partial discharge test% {+ ?$ B8 s |# ~' Q6 Z- |
according to 7.5.3, if the recurring peak working voltage across the insulation is greater than
' @1 g a1 W% B3 I2 ~2 _( ?( m700 V and the voltage stress on the insulation is greater than 1 kV/mm. |
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