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tangxianyu 发表于 2012-10-30 15:32
( {1 C6 D7 e( S9 F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 ...
$ @0 Q$ b. d4 jCTI>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);# z7 a8 f, d$ r- X! h
多層板內部距離被認為是Solid insulation,經受住如下測試就OK.
" n! o) L3 z8 B7.3.7.8.2 Requirements for electrical withstand capability of solid insulation
1 l1 [( ]8 H$ Q! B Z- @. L" x7.3.7.8.2.1 Basic, supplemental, reinforced, and double insulation
% G' B0 F u, XSolid insulation shall withstand the applicable impulse withstand voltage test according to L7 z$ a8 E7 {6 n7 x$ k
7.5.1 and the a.c. or d.c. voltage test according to 7.5.2.
, N/ b+ `1 l0 l; L3 L2 PIn addition, double and reinforced insulation shall withstand the partial discharge test7 _+ ?; Q* Q0 X/ a
according to 7.5.3, if the recurring peak working voltage across the insulation is greater than
/ O' s5 r7 M- ]! V700 V and the voltage stress on the insulation is greater than 1 kV/mm. |
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