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IEC60664 第2.2.2.1.1里有相应的定义. 大家可以看看。
' ]& g* C6 C. S& L" W' [, \. b-equipment of overvoltage category IV is for use at the orgin of the installation.! \- h: A% g( C @& Y3 S
- equipment of overvoltage category III is equipment in fixed installations and for cases where is reliability and the availability of the equipment is subject to specialrequirments.. C+ E6 J( v: f
Note: examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.: N5 d, o3 O7 Y0 C7 i2 p
- equipment of overvoltage category II is erergy-consuming equipment to be supplied from the fixed installation. & E+ k1 q( s% ?' P9 j; a
Note examples of such equipment are appliances, portable tools and other household and similar loads. , H/ b" l6 x2 @9 G5 }
If such equipment is subjected to special requirments with regard toi reliability and availability, overvoltage category III applies.# y% l. A$ j; n% t) u$ K
-equipment of overvoltage category I is equipment for connection to circuits in which measures are taken to limit transient overvoltages to an appropriately low level. |
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发表于 2007-9-16 00:33
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