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本帖最后由 H-RH 于 2012-3-22 22:28 编辑 8 s1 ^) G# F' K- T" C
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Pollution Degree 1: No pollution or only dry, nonconductive pollution occurs. The pollution has no effect. 8 L- t5 F4 A) O0 }5 L
Pollution Degree 2: Normally only nonconductive pollution occurs. Temporary conductivity caused by condensation is to be expected. ) E3 F( l4 ^3 B9 m# ~
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). - d% e$ W! O7 T. n) l" U
Pollution Degree 4: The pollution generates persistent conductivity caused by conductive dust, rain, or snow.
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6 I! A+ D# ]8 V/ m4 w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。 7 a2 f( r, y; D' a5 Q/ Q) r
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)。
- _! f) \1 X( J0 I4 X) C/ T$ J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)。 / A9 w" N9 V, a7 t1 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)。 0 @3 L8 O! V4 ^2 ?" s; Q
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