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本帖最后由 H-RH 于 2012-3-22 22:28 编辑
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Pollution Degree 1: No pollution or only dry, nonconductive pollution occurs. The pollution has no effect.
+ [: ^% [8 N. P4 Z0 e3 OPollution Degree 2: Normally only nonconductive pollution occurs. Temporary conductivity caused by condensation is to be expected. 2 a# d) `; d5 i0 m& h0 G( b! `
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). / M8 V( c2 y0 y1 q& `0 K
Pollution Degree 4: The pollution generates persistent conductivity caused by conductive dust, rain, or snow.
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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。 4 B# g9 J* D# R8 Z% G
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)。
6 ]" R' F6 ]9 j* h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)。 4 b7 C V! B; E: D- ]
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)。 + r! T" c9 v4 D: |% U1 J5 d
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