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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# Z/ j* h& _1 Z$ e
-equipment of overvoltage category IV is for use at the orgin of the installation.
/ D; C2 \9 n: T* c4 y3 K- 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.* L2 j& L; _0 H9 j
Note: examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.4 }1 k& `: K: Y" R) f: U
- equipment of overvoltage category II is erergy-consuming equipment to be supplied from the fixed installation. 0 N' m8 @' u# ^& [1 G
Note examples of such equipment are appliances, portable tools and other household and similar loads.
' k% M9 x1 T- e- h- e) DIf such equipment is subjected to special requirments with regard toi reliability and availability, overvoltage category III applies.
: T& J* n' _& }) c y% C/ 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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