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IEC60664 第2.2.2.1.1里有相应的定义. 大家可以看看。# Z6 h$ [' v: c+ X9 V! @
-equipment of overvoltage category IV is for use at the orgin of the installation.+ l- ]. h; x) E
- 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.
) d- v% z( S6 r V2 ?; {Note: examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.& c! B9 n3 O, r3 Z' ~! F
- equipment of overvoltage category II is erergy-consuming equipment to be supplied from the fixed installation.
7 K1 z- c, J5 U8 D& j# jNote examples of such equipment are appliances, portable tools and other household and similar loads. ( _! p: o1 H3 u- }! r) I3 @
If such equipment is subjected to special requirments with regard toi reliability and availability, overvoltage category III applies.3 r x3 F3 g, a- v
-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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