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IEC60664 第2.2.2.1.1里有相应的定义. 大家可以看看。" a- I. ^+ N* q2 B* \6 l
-equipment of overvoltage category IV is for use at the orgin of the installation.
% n& b/ f1 s3 G1 b" @- 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.
/ R4 X: V/ N& e' M% }, ?& SNote: examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.7 @/ p7 P2 j% }! x' r
- equipment of overvoltage category II is erergy-consuming equipment to be supplied from the fixed installation.
1 N# x) i6 d' {Note examples of such equipment are appliances, portable tools and other household and similar loads. " W" T+ {+ k1 n* w0 F
If such equipment is subjected to special requirments with regard toi reliability and availability, overvoltage category III applies.2 c* ?5 w& ?& G6 z% @' B, g& F5 d( V5 u
-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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