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IEC60664 第2.2.2.1.1里有相应的定义. 大家可以看看。- ~5 f. M2 c; V f) P) G5 p$ Q
-equipment of overvoltage category IV is for use at the orgin of the installation.
% V& v8 c) m. _. Z" `- 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.
; i& E0 m: i! b; R. n& D& Z9 V0 qNote: examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.! w/ @) p- x6 q
- equipment of overvoltage category II is erergy-consuming equipment to be supplied from the fixed installation.
- @7 g) ^( w4 p* ?Note examples of such equipment are appliances, portable tools and other household and similar loads.
* u, x4 ?- a" F2 M, wIf such equipment is subjected to special requirments with regard toi reliability and availability, overvoltage category III applies.
" b' P: I9 c$ }+ U% b: b5 G-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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