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IEC60664 第2.2.2.1.1里有相应的定义. 大家可以看看。
* H0 Q/ L! p' C& z# J1 }-equipment of overvoltage category IV is for use at the orgin of the installation.
2 l9 M5 b- {* Q8 r9 I. z, h% e- 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.
4 t1 V0 ^) U1 E$ j( q- W- d) N9 X9 B1 g KNote: examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.' j7 Z) ]# c# `& t' F' T
- equipment of overvoltage category II is erergy-consuming equipment to be supplied from the fixed installation. ( B+ A, l3 P# u8 T5 T1 D. i4 g
Note examples of such equipment are appliances, portable tools and other household and similar loads.
" V5 w! I, j# q( N8 i+ rIf such equipment is subjected to special requirments with regard toi reliability and availability, overvoltage category III applies.3 D6 u$ A7 e M9 C) ~; N' F$ u
-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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