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tangxianyu 发表于 2012-10-30 15:32
* Y: G" i, B" s2 i* w2 w1 V, G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 ...
+ @" `7 l, {/ l; e; F, ^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);. k8 k; b5 ^( ~, }8 m
多層板內部距離被認為是Solid insulation,經受住如下測試就OK.' ?* s+ T1 R/ n4 w
7.3.7.8.2 Requirements for electrical withstand capability of solid insulation2 A2 a x5 F% _' a3 x, B7 I; M
7.3.7.8.2.1 Basic, supplemental, reinforced, and double insulation
& |, Q$ _5 ], X7 B' U( _2 H8 V2 ]Solid insulation shall withstand the applicable impulse withstand voltage test according to- Z: A! b3 G" t0 w* W( ~
7.5.1 and the a.c. or d.c. voltage test according to 7.5.2.
- O i0 s% `- O& t) a# PIn addition, double and reinforced insulation shall withstand the partial discharge test6 G. A0 y# F) h. a
according to 7.5.3, if the recurring peak working voltage across the insulation is greater than
0 k' J7 Y2 G" \3 P J700 V and the voltage stress on the insulation is greater than 1 kV/mm. |
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