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污染等级参考这个:4 \% W: @9 @$ p( a/ l" Y& U
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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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, }! ]& x5 S( S7 E& A! t b hPollution Degree 2: Normally only non-conductive pollution. Temporary Condensation possible. Offices, laboratories, test stations
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! G, \% U* ] z/ oPollution Degree 3: Conductive and non-conductive pollution present. Condensation frequent. Industrial & farming areas (under cover), unheated rooms, Boiler rooms
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Pollution Degree 4: Pollution generates persistent conductivity caused by wet dust, rain or snow. Outdoor use, remote stations: e* |8 l+ n& d+ {/ k& G
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材料类别 (Material group) 在 6.13:
2 c2 U; ?+ b ^' z6.13.1 – material of material group IIIb with a PTI of 100 and up to but excluding 175;4 }$ C% U/ U9 Z3 B2 Q/ x: K4 N
6.13.2 – material of material group IIIa with a PTI of 175 and up to but excluding 400;
- Z9 q2 v8 X: D5 K6.13.3 – material of material group II with a PTI of 400 and up to but excluding 600;/ W4 b; ^; H) b1 U E( t( W6 l
6.13.4 – material of material group I with a PTI of 600 and over.
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