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个人理解为Ⅲ级即配电级* }6 P9 K2 l+ t7 O( R2 C) i A
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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.
8 ?; g& p: P$ Y5 o( g3 VNOTE 2 Examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation.9 E- A$ K, A! ~1 c1 }- u* \' O
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Equipment of overvoltage category II is energy consuming equipment to be supplied from the fixed installation.
. I1 t7 ~4 S, p" ~' \: BNOTE 3 Examples of such equipment are appliances, portable tools and other household and similar loads.
1 [- e5 d7 Y: _2 f; R4 IIf such equipment is subjected to special requirements with regard to reliability and availability, overvoltage category III applies. |
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