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个人理解为Ⅲ级即配电级$ ]; l2 R3 W3 x0 c6 s3 X. k
; [6 ?6 W2 J! H: e" VEquipment of overvoltage category III is equipment in fixed installations and for cases where the reliability and the availability of the equipment is subject to special requirements.
" Z0 q) f8 R' s3 b. c4 UNOTE 2 Examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.
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Equipment of overvoltage category II is energy consuming equipment to be supplied from the fixed installation. Z! Q$ P1 {) a. {
NOTE 3 Examples of such equipment are appliances, portable tools and other household and similar loads.! x2 h: e A; l; C' `! O N7 U
If such equipment is subjected to special requirements with regard to reliability and availability, overvoltage category III applies. |
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