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IEC60664 第2.2.2.1.1里有相应的定义. 大家可以看看。& x9 t/ r3 `, h
-equipment of overvoltage category IV is for use at the orgin of the installation.1 \( M1 X/ ^1 U" Z# c: Y/ w+ \
- 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.
8 o, h- r+ g% v7 C/ C# ANote: examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.
. e, q1 R0 D" }; s- equipment of overvoltage category II is erergy-consuming equipment to be supplied from the fixed installation.
2 b, n3 C: R4 S0 I7 y2 WNote examples of such equipment are appliances, portable tools and other household and similar loads.
9 A8 b0 A+ P% v) ]! Q o5 v2 SIf such equipment is subjected to special requirments with regard toi reliability and availability, overvoltage category III applies.' K' `) z# @& }6 o+ ^+ Y4 D1 V
-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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