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IEC60664 第2.2.2.1.1里有相应的定义. 大家可以看看。
* p6 x# ~# D. u$ @-equipment of overvoltage category IV is for use at the orgin of the installation.8 I. H2 O, |/ K( T0 B
- 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.5 }& e* s# k" ?, [7 E7 |% i
Note: examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.
* {4 R9 @8 M" @- equipment of overvoltage category II is erergy-consuming equipment to be supplied from the fixed installation. 0 V7 M+ C8 }4 [0 \
Note examples of such equipment are appliances, portable tools and other household and similar loads.
! N a3 @7 W7 Y( SIf such equipment is subjected to special requirments with regard toi reliability and availability, overvoltage category III applies.
0 n6 p! z3 @( H- W' s. X9 h) 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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