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本帖最后由 H-RH 于 2012-3-22 22:28 编辑
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: t; L/ \4 Q' y* r' s! OPollution Degree 1: No pollution or only dry, nonconductive pollution occurs. The pollution has no effect. 4 c ]6 ~6 M+ i9 m2 n, s, O5 f
Pollution Degree 2: Normally only nonconductive pollution occurs. Temporary conductivity caused by condensation is to be expected.
; G$ d3 @2 p/ U) GPollution 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).
; ?: `8 O h; s0 o3 D$ iPollution Degree 4: The pollution generates persistent conductivity caused by conductive dust, rain, or snow.
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+ P. b: a' N" w$ }/ f! D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。
/ O' X4 V x: O2 X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)。
: t% Q6 N" \9 b/ _. X# N8 t/ w# }$ V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)。
9 W$ p8 g+ y, K3 s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)。 % g7 N" s* |5 s6 J8 |
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