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个人理解为Ⅲ级即配电级
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Equipment 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.3 x$ [2 A5 y% ~/ h% p7 G. \) `
NOTE 2 Examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.- Z; \3 ~* ?, b7 r& G
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Equipment of overvoltage category II is energy consuming equipment to be supplied from the fixed installation.
/ W3 c& I/ a& E7 j# i& RNOTE 3 Examples of such equipment are appliances, portable tools and other household and similar loads.* {( ^$ i( X1 A# v2 b( O
If such equipment is subjected to special requirements with regard to reliability and availability, overvoltage category III applies. |
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