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IEC60664 第2.2.2.1.1里有相应的定义. 大家可以看看。
- Y( x! y+ Q- j/ G-equipment of overvoltage category IV is for use at the orgin of the installation.
/ f! S% e+ I, b0 I; x& O& ]' |; 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.
( Y% u2 e; u2 P* Z: p0 S8 J' ?Note: examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.
% V: A- K5 ~# b- equipment of overvoltage category II is erergy-consuming equipment to be supplied from the fixed installation. ; x+ e4 J7 {: @- i% h
Note examples of such equipment are appliances, portable tools and other household and similar loads. 4 T" I# S. C% L- X* r8 ]% `
If such equipment is subjected to special requirments with regard toi reliability and availability, overvoltage category III applies.
6 }( [- D5 x, o9 k-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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