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IEC60664 第2.2.2.1.1里有相应的定义. 大家可以看看。
5 @6 S1 y' o+ p: Y: n) w-equipment of overvoltage category IV is for use at the orgin of the installation.
( z. u( ?- T' \! ~/ \, O: { X- 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.
% |7 ^# A6 ]# {% f; V b+ SNote: examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.7 X( w7 o* y9 Y; P5 p: z8 N" f
- equipment of overvoltage category II is erergy-consuming equipment to be supplied from the fixed installation. 5 t1 L8 x9 P1 [7 X; s2 ?/ R
Note examples of such equipment are appliances, portable tools and other household and similar loads.
( W0 O& n8 C' r1 bIf such equipment is subjected to special requirments with regard toi reliability and availability, overvoltage category III applies.
0 [) r; a$ V- L" A q+ f6 L-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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