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IEC60664 第2.2.2.1.1里有相应的定义. 大家可以看看。
: j- B, }3 C; B8 l: Z, i5 n-equipment of overvoltage category IV is for use at the orgin of the installation.& L3 C3 p- e% Y6 _ b# L
- 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" l: S, K6 R, o: L
Note: examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.# D K3 o. W# d; y" A3 W% x7 a
- equipment of overvoltage category II is erergy-consuming equipment to be supplied from the fixed installation. 4 S- |& T4 r) v5 }- p- P
Note examples of such equipment are appliances, portable tools and other household and similar loads.
, R5 ]: k5 f8 L- R) G! `( N# ^' d. eIf such equipment is subjected to special requirments with regard toi reliability and availability, overvoltage category III applies.
9 U' S" K7 j( ^. T-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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