IEC60730.1标准中爬电距离 材料类别和污染等级

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请问IEC60730.1标准中爬电距离测量，其材料类别和污染等级怎么确定呢？有什么标准详细分类了吗？谢谢。

H-RH

污染等级参考这个:
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https://www.myomron.com/index.php?action=kb&article=513
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Pollution Degree 1 : No pollution or only dry non-conductive pollution. It has no effect. Clean room environments, Inside sealed components
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Pollution Degree 2: Normally only non-conductive pollution. Temporary Condensation possible. Offices, laboratories, test stations
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" m% S" H! k2 x1 G8 u2 uPollution Degree 3: Conductive and non-conductive pollution present. Condensation frequent. Industrial & farming areas (under cover), unheated rooms, Boiler rooms

Pollution Degree 4: Pollution generates persistent conductivity caused by wet dust, rain or snow. Outdoor use, remote stations
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材料类别 (Material group) 在 6.13:
/ v. g8 A" @: I' |$ X6.13.1 – material of material group IIIb with a PTI of 100 and up to but excluding 175;
6.13.2 – material of material group IIIa with a PTI of 175 and up to but excluding 400;
( A0 h2 N! D* }; @# D! V2 l6.13.3 – material of material group II with a PTI of 400 and up to but excluding 600;
8 @9 ~: [) [. T$ x6.13.4 – material of material group I with a PTI of 600 and over.