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IEC60664 第2.2.2.1.1里有相应的定义. 大家可以看看。
# A0 F2 o' M/ B; y3 @% O-equipment of overvoltage category IV is for use at the orgin of the installation.
9 q+ g( D5 Y6 r" S- 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./ e8 j/ ~# F" Y) |
Note: examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.
1 X9 M% M" D' |* Q- equipment of overvoltage category II is erergy-consuming equipment to be supplied from the fixed installation.
$ m" i- z( Z; G% K4 UNote examples of such equipment are appliances, portable tools and other household and similar loads.
- h8 P* G- j( RIf such equipment is subjected to special requirments with regard toi reliability and availability, overvoltage category III applies.
& w7 E' S3 C$ F8 f# 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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