DSH 714 Application of tracking test

小米

广东安规检测
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小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

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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

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家电温升测试角

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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

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Application of tracking test

29.2 , [: G0 Z$ u3 X: y

60335-1(ed.4)

Question:
6 h7 u+ ?9 A; p* vIt is stated in clause 29.2 of IEC 60335-1 that insulating material in connection with required creepage distances has to be of material group I, II, IIIa or IIIb.
% F/ t1 ]; _. b# `For example, there may be 10 different relevant materials in a simple motor, all of which have to be tested unless the materials are already separately certified for CTI. Often we hear from customers that they have to deliver certificates or special prepared test
" J( T, H# ?  |! \& \3 }samples in case the parts are not satisfactory for testing, due to size or shape.
Is it always necessary to verify that the material group is at least of material group IIIb.?
+ h& z. B5 Y4 t  EDecision:
Yes, it is always necessary to verify that the material group is at least of group IIIb.
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