DSH 2001

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广东安规检测
有限公司提供：

小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

Question
1 |. t0 p" e$ c- v* K1) In case of components mounted on a printed wiring board (PWB) and placed across
9 j0 \1 T$ _1 ]$ o9 Y. v  d8 Q(bridging) insulating distances on the PWB (e.g. providing basic or even reinforced insulation),
! Z6 O: e4 V5 B2 N# Nhow to deal with the different distance requirements for distances on the printed wiring
material and for distances on other plastics e.g. the housing material of the component
0 W) v+ L( K. U8 ~(depending on the applicable material group)?
2) In case of components mounted on a printed wiring board (PWB) and placed across
4 v2 l& b% n3 j" a' x* i$ ?' ?3 ^insulating distances on the PWB (e.g. providing basic or even reinforced insulation), how to
deal with the different distance requirements, if the material group for PWB and for the
$ u  h" }* x$ ]7 g' E8 D" Ucomponents placed on it is not the same (e.g. PWB of material group I and relay base of
, p: A% g+ W- V. imaterial group IIIa)?
2 C$ ~0 s4 Q( g0 S2 F! jDecision
2 d. \: u" J/ {! z8 W1) The defined reduced values for the required creepage distances relevant to printed wiring
" e( {* _& T0 k$ A6 A% |2 Pmaterial in micro-environment of pollution degrees 1 and 2 may only be applied when there
are no components bridging the investigated insulation. If components are bridging insulating
- t# G. t7 ^& _$ H- zdistances on the PWB, the creepage distance requirements relating to the (component)
material representing the worst case has to be applied for the PWB also.
$ p6 E1 B$ w# k5 q& f2) In case of different material groups for the PWB and the components, again the requirement
relating to the material representing the worst case has to be used.
% f+ O9 P8 D2 T! c; O2 K1 a# RRemark: A component is considered to bridge insulation on the PWB, if the surface of the
, v$ a3 z, G4 x: {* `component is located at a distance less than the value “X” (e.g. according to IEC 60664 series)
from the isolating PWB surface. See also enclosed drawing.

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DSH 2001附件