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IEC60664 第2.2.2.1.1里有相应的定义. 大家可以看看。
+ B& m8 r& M9 q# m8 A& Y( N-equipment of overvoltage category IV is for use at the orgin of the installation.; V1 k8 A* X+ ~$ H
- 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.. G$ r% F3 C m$ D
Note: examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.% i. y \; T: t0 P2 \% }0 J
- equipment of overvoltage category II is erergy-consuming equipment to be supplied from the fixed installation.
+ @ }* n1 A3 Q& \' ]% z# ^; SNote examples of such equipment are appliances, portable tools and other household and similar loads. 5 q/ {* U' r8 S
If such equipment is subjected to special requirments with regard toi reliability and availability, overvoltage category III applies.
& e& g1 B$ \; v3 \% U( Y' S-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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