标题: DSH 1066_IEC 60730-1 [打印本页] 作者: chinatown 时间: 2017-1-6 15:54 标题: DSH 1066_IEC 60730-1 [attach]110411[/attach] 6 b F% u7 D" ]5 x T[attach]110411[/attach] C+ R1 O6 ~* o& j, ?" ~% ~* \2 }# m3 i/ V1) In case of components mounted on a printed wiring board (PWB) and placed across safety# C- P) m$ @& Z- G) Q
insulation (e.g. reinforced insulation), how to deal with different requirement both for printed wiring7 A2 o- \1 S9 X% v( c
material and different group of materials? & s2 E, ]% \; K* T2) In case of components mounted on a printed wiring board (PWB) and placed across safety$ c$ i0 v" a2 {! P9 r
insulation (e.g. reinforced insulation), how to deal in case of different material group for PWB and 2 ?* d6 o3 ?5 k, gcomponents placed on it (e.g. PWB of material group I and relay base of material group IIIa)? / o$ V1 E" H' q' h- ^3 e8 l" K : N1 h7 P, ^3 @Decision7 @) ~! }) J& k, t6 P0 c
1) Column relevant to printed wiring material in micro-environment of pollution degree 1 and 2 can: ^' E/ \" g6 C$ i
only be used when there are no components placed on the PWB, across the investigated insulation. J9 f; G$ H: O7 P: g
In this case, the column showing the worst case has to be used.* n$ f! u2 \! W* J
2) In case of different material group both for PWB and components, column showing the worst case " N7 b$ @- S$ g5 G+ L' _ ahas to be used.+ N, ~% _, B+ a( d
Remark: For the scope of these decisions, a component is considered to be in contact with the PWB9 l5 y) W3 O! c9 N \' i- }' L
if the surface of the component is located at a distance less than the “X” value indicated in table of $ O+ r( }% [+ C) sannex B. See enclosed drawings& a6 |6 j9 ~0 w5 X% |