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IEC60664 第2.2.2.1.1里有相应的定义. 大家可以看看。9 u3 J3 L7 O5 d* k8 |
-equipment of overvoltage category IV is for use at the orgin of the installation.
2 p0 M y: p& Z+ ?5 D% S 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.# T8 R- c0 c& x$ r
Note: examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.. K; c. P0 x( \- x9 v& X1 D
- equipment of overvoltage category II is erergy-consuming equipment to be supplied from the fixed installation.
6 D1 x0 {3 m& p+ o, u8 Y9 C' @Note examples of such equipment are appliances, portable tools and other household and similar loads. + N, Y* T5 Y: t& H7 Y
If such equipment is subjected to special requirments with regard toi reliability and availability, overvoltage category III applies.
# w* P# ~1 g$ X1 w6 K) @0 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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