|
本帖最后由 H-RH 于 2012-3-22 22:28 编辑
2 v' f: l5 N9 D, X# F) R
9 h$ D0 z5 w$ d5 K( @) g2 yPollution Degree 1: No pollution or only dry, nonconductive pollution occurs. The pollution has no effect. , t, U9 v9 |& D9 y
Pollution Degree 2: Normally only nonconductive pollution occurs. Temporary conductivity caused by condensation is to be expected. & W# V+ k" c) E$ [6 ^$ J' x
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). # B: v4 {. ?8 a* y. S( m/ J: Z
Pollution Degree 4: The pollution generates persistent conductivity caused by conductive dust, rain, or snow.
Y7 }# X6 O* ` D8 ^ b
: ?% U" N' a2 [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。
6 R3 Z) _% C& H) O# M1 q/ V [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)。
, k% G2 e: \9 P( D: i# g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)。
' w. _( r! U' [8 X3 j' }! I1 r$ }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)。
; k! H5 B0 F: U
4 h2 W' X/ g9 @ |
评分
-
查看全部评分
|