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IEC60664 第2.2.2.1.1里有相应的定义. 大家可以看看。7 I) M) x* D# ~% D8 H
-equipment of overvoltage category IV is for use at the orgin of the installation.
/ P0 ^6 W( a5 `% w3 u( 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." e5 `6 R) s" v, ]. ~* `0 L; L) B8 k
Note: examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.
7 J3 P; q; s( J; A: K+ z/ M8 _- equipment of overvoltage category II is erergy-consuming equipment to be supplied from the fixed installation. 7 `) e" _+ t; u. Q+ t1 A
Note examples of such equipment are appliances, portable tools and other household and similar loads.
9 S: M1 |0 s2 S# _) |If such equipment is subjected to special requirments with regard toi reliability and availability, overvoltage category III applies.8 ?- Q2 ]2 f' x3 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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