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IEC60664 第2.2.2.1.1里有相应的定义. 大家可以看看。
! ?( z$ n4 ~2 M' E3 t8 s) ^-equipment of overvoltage category IV is for use at the orgin of the installation.$ b {9 O3 g; i. o# @# m. ?' `5 a6 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.3 _7 n8 i: G% m5 r7 |+ o7 A3 n
Note: examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation." j7 L! ~3 {& O8 r& N( q2 I$ i
- equipment of overvoltage category II is erergy-consuming equipment to be supplied from the fixed installation. 0 A7 i% x- w9 K% f f0 p: Z
Note examples of such equipment are appliances, portable tools and other household and similar loads. ; P$ g2 A" V$ @2 x l- }
If such equipment is subjected to special requirments with regard toi reliability and availability, overvoltage category III applies.
# E' Z! G. A# B4 M7 N-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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发表于 2007-9-16 00:33
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