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本帖最后由 H-RH 于 2012-3-22 22:28 编辑 ; A* m( w2 n3 i
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Pollution Degree 1: No pollution or only dry, nonconductive pollution occurs. The pollution has no effect. 0 C- J% ]3 N/ k3 Y+ F6 }4 t
Pollution Degree 2: Normally only nonconductive pollution occurs. Temporary conductivity caused by condensation is to be expected. - S& H) O" [/ ?" M" p M8 G" S
Pollution Degree 3: Conductive pollution or dry nonconductive pollution that becomes conductive due to condensation occurs. To be found in industrial environment or construction sites (harsh environments). 3 t9 L% f- i3 j& }/ L; W
Pollution Degree 4: The pollution generates persistent conductivity caused by conductive dust, rain, or snow.0 s7 s% A. L9 V2 j0 C2 {) ]1 V4 |/ z, ?
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污染等级1:无污染或仅有干燥的非导电性污染,此污染对设备没有影响。 0 Z `. t# ~- J' _3 @6 g3 Z; Z
污染等级2:一般情况下只有非导电性污染,但是也应预料到由于凝露偶尔造成的暂时的导电性(如办公设备中的家用电器、布线材料、灯、网络部分)。
: J, u' O* ^5 }' L3 Q4 b污染等级3:存在导电性污染,或者由于凝露使干燥的非导电性污染变成导电性的污染。(如:加工设备中的电气设备、工具设备中的低压开关)。 ' C# g) N7 L* i4 Z9 B
污染等级4:造成持久性的导电及电气机车、机动车、无轨电车和车厢下的设备,机车内暴露在外的设备)。
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