标题: DSH 2001 [打印本页] 作者: chinatown 时间: 2017-1-7 22:05 标题: DSH 2001 Question* T; D8 _: x: ^6 R6 a+ }% n, {
1) In case of components mounted on a printed wiring board (PWB) and placed across( U. d: s: l2 N b& S7 _
(bridging) insulating distances on the PWB (e.g. providing basic or even reinforced insulation), 5 h! A: u' A- c# \0 W+ B2 }5 X3 Lhow to deal with the different distance requirements for distances on the printed wiring1 ]( o* J' R5 }0 p4 g2 z) W0 P
material and for distances on other plastics e.g. the housing material of the component 5 V. H: r$ w- o, Z(depending on the applicable material group)?3 `4 @5 }, R. \7 }# c/ ^/ A* N& b
2) In case of components mounted on a printed wiring board (PWB) and placed across ) e6 P3 v' g) S/ ~1 ^- K; ]insulating distances on the PWB (e.g. providing basic or even reinforced insulation), how to 3 t8 \: _7 k2 B+ F# U+ Bdeal with the different distance requirements, if the material group for PWB and for the% E$ K, X9 h! V c. S1 Z2 u0 c
components placed on it is not the same (e.g. PWB of material group I and relay base of * S6 U2 q* m ]: A% g+ dmaterial group IIIa)?6 H8 c6 n7 j: B9 a
Decision % ]( u }4 C5 m0 e* G o; Q$ s1) The defined reduced values for the required creepage distances relevant to printed wiring& O7 s" b: j5 s$ I' ]6 Z
material in micro-environment of pollution degrees 1 and 2 may only be applied when there. R$ J5 J9 [8 o0 t' s+ N
are no components bridging the investigated insulation. If components are bridging insulating$ W6 N5 ^% A# K0 G9 U& E
distances on the PWB, the creepage distance requirements relating to the (component) \. C% G( ]+ | {# S
material representing the worst case has to be applied for the PWB also.9 i9 b2 C7 a' Y# j
2) In case of different material groups for the PWB and the components, again the requirement! v& D# N( i& t4 W
relating to the material representing the worst case has to be used.4 [2 R5 j! ^- }
Remark: A component is considered to bridge insulation on the PWB, if the surface of the " ]+ \& A8 u( T5 R3 Ycomponent is located at a distance less than the value “X” (e.g. according to IEC 60664 series)+ ~& ~$ \6 z/ ~: h9 T
from the isolating PWB surface. See also enclosed drawing.# {1 s+ Z9 P4 [' f5 H8 Q" L" w1 J
% Z7 t2 O: n; g. q+ I4 T
: S# E% I$ ?& g5 E0 Z# H# U 作者: chinatown 时间: 2017-1-7 22:06
DSH 2001附件