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),
4 N' z* L) t1 A+ \0 r4 f+ b" Mhow to deal with the different distance requirements for distances on the printed wiring
+ [2 h% E( ^# u2 [' wmaterial and for distances on other plastics e.g. the housing material of the component
(depending on the applicable material group)?
( j7 M5 t2 M( S( B2) 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
8 J. J" Q4 F1 _7 T2 Z1 a. Pdeal with the different distance requirements, if the material group for PWB and for the
* ]. C- X, E7 U" Scomponents placed on it is not the same (e.g. PWB of material group I and relay base of
8 `- E( B" O- ]2 m$ o0 l, Jmaterial group IIIa)?
+ D. ]& S9 t. K- S" @Decision
* @8 K  ]3 x8 r3 o1 b; u3 m4 c' A1) The defined reduced values for the required creepage distances relevant to printed wiring
material 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
6 v2 t1 B0 k$ z3 O; s" ~6 wdistances on the PWB, the creepage distance requirements relating to the (component)
# A3 c6 Q5 E3 _) s6 dmaterial 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
, v; _/ F+ S3 e) X5 S7 Erelating to the material representing the worst case has to be used.
Remark: A component is considered to bridge insulation on the PWB, if the surface of the
' E% I4 M- l9 q$ a3 I* u" Qcomponent is located at a distance less than the value “X” (e.g. according to IEC 60664 series)
# u& @. s* |* u0 B$ s. yfrom the isolating PWB surface. See also enclosed drawing.
, Z& c8 I8 j$ Y

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DSH 2001附件