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IEC60664 第2.2.2.1.1里有相应的定义. 大家可以看看。: y0 v! d% q2 f* o$ ]% f( X6 }* H
-equipment of overvoltage category IV is for use at the orgin of the installation.6 R* a2 Z+ B5 t4 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.* h- \$ z3 {. w4 j% e. |0 G
Note: examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.0 P7 O) n* ]* R. D2 ~$ \; r
- equipment of overvoltage category II is erergy-consuming equipment to be supplied from the fixed installation. 0 A2 D4 i1 }+ |: w) S% c& L! G, m
Note examples of such equipment are appliances, portable tools and other household and similar loads.
( ?1 b8 ]; I7 d: K1 JIf such equipment is subjected to special requirments with regard toi reliability and availability, overvoltage category III applies.
* R& _& x$ D- @$ G- b-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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