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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. - R8 ?& b+ f# \' t/ v I
Pollution Degree 2: Normally only nonconductive pollution occurs. Temporary conductivity caused by condensation is to be expected. # a6 E0 r3 I. O* ]2 s# U
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).
S" S* D1 ?" z" t$ W/ f/ d2 tPollution Degree 4: The pollution generates persistent conductivity caused by conductive dust, rain, or snow.6 \3 _4 E. u! F; m
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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。 5 }" I" N/ T9 e [2 `
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)。 % y! k6 C6 r, m4 v' u7 P6 S+ o
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)。
, Y- m3 l/ i Q$ Z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)。 * Z2 s' b% z3 j: |+ o! ~
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