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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& C1 i8 H/ Y% q! q3 [3 c* n+ B3 u# k-equipment of overvoltage category IV is for use at the orgin of the installation.
1 s5 @ V2 H+ s) N! n- 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., Y( T7 m, e8 ]3 _# _3 v
Note: examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.* ]" a0 E* u! m9 {' \. Z3 U1 e
- equipment of overvoltage category II is erergy-consuming equipment to be supplied from the fixed installation.
. D4 Q8 o L$ v+ _* _Note examples of such equipment are appliances, portable tools and other household and similar loads. ! Q% e I: `/ V% O( q2 b
If such equipment is subjected to special requirments with regard toi reliability and availability, overvoltage category III applies.( f4 ^: U: o4 y
-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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