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) In case of components mounted on a printed wiring board (PWB) and placed across
(bridging) insulating distances on the PWB (e.g. providing basic or even reinforced insulation),
1 V; z" B, L! j% ]- dhow to deal with the different distance requirements for distances on the printed wiring
. ]! S. f$ w6 {# p0 t0 |. \material and for distances on other plastics e.g. the housing material of the component
5 K1 o) p& I' |8 N(depending on the applicable material group)?
2) In case of components mounted on a printed wiring board (PWB) and placed across
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
components placed on it is not the same (e.g. PWB of material group I and relay base of
$ F. T9 j) U+ ]0 [& J3 Xmaterial group IIIa)?
. @, s' D( M- ?+ fDecision
1) The defined reduced values for the required creepage distances relevant to printed wiring
: Q5 P% j; w2 `/ K# Imaterial 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
distances on the PWB, the creepage distance requirements relating to the (component)
material representing the worst case has to be applied for the PWB also.
2) 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.
0 ?0 A! h+ P, }; A7 ~Remark: A component is considered to bridge insulation on the PWB, if the surface of the
7 r, ?, ?( V) n3 z& v5 Qcomponent is located at a distance less than the value “X” (e.g. according to IEC 60664 series)
, u( M/ v) J* N( ?! tfrom the isolating PWB surface. See also enclosed drawing.
0 e  @" B. ]  T. b

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DSH 2001附件