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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.
- U9 D r8 J3 z3 r" ]# S0 hPollution Degree 2: Normally only nonconductive pollution occurs. Temporary conductivity caused by condensation is to be expected. 9 k2 `; ?7 f' p, N2 D4 x% B* T
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).
+ |6 \% {( ?% |; M& iPollution Degree 4: The pollution generates persistent conductivity caused by conductive dust, rain, or snow.6 J, a/ J {; J3 X+ }. p f5 v
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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。
! l5 v) I; A4 f' k' P" w6 X1 l$ [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) Q! Z, i) d
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)。
! U* ]% O: |" `& {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)。 # P; U$ k I9 c9 ]0 ~' f. O
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