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IEC60664 第2.2.2.1.1里有相应的定义. 大家可以看看。
2 b9 E4 f+ g/ j5 R-equipment of overvoltage category IV is for use at the orgin of the installation.
" ~% f+ j1 D( o: d& H" e4 E) O- 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.3 }5 C8 b" [ p: v4 U; p
Note: examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.
" A) R. k# g" p/ O, F$ ]- equipment of overvoltage category II is erergy-consuming equipment to be supplied from the fixed installation.
) G) o# D( c- G- qNote examples of such equipment are appliances, portable tools and other household and similar loads.
t8 ]$ `8 u% m8 nIf such equipment is subjected to special requirments with regard toi reliability and availability, overvoltage category III applies.
7 W5 r8 U! F7 c, O( Z-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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