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tangxianyu 发表于 2012-10-30 15:32 3 i/ y6 X( P1 j- H" N5 ^
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) }) _0 R: A- P1 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);+ [/ \0 Z% f7 y* j1 R
多層板內部距離被認為是Solid insulation,經受住如下測試就OK." S0 P6 `; ]5 f- e$ m5 C5 f3 K6 y
7.3.7.8.2 Requirements for electrical withstand capability of solid insulation+ G; d8 |; J, x& ]9 W, a( s. H
7.3.7.8.2.1 Basic, supplemental, reinforced, and double insulation T2 h6 Y: S) d1 i: q/ ]3 l
Solid insulation shall withstand the applicable impulse withstand voltage test according to
+ S5 D7 v$ q0 O7 ]3 U% S7.5.1 and the a.c. or d.c. voltage test according to 7.5.2.
' R8 f# i0 k" t, F( R3 W# @# KIn addition, double and reinforced insulation shall withstand the partial discharge test
. T1 c+ [. Z$ ~) ~, Uaccording to 7.5.3, if the recurring peak working voltage across the insulation is greater than
, a8 ?, t+ \2 j2 q6 X1 q& I700 V and the voltage stress on the insulation is greater than 1 kV/mm. |
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