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Annex K 定義了overvoltage categories 而這 categories 是由 IEC 60664-1 抽出來,
! m- d8 o/ Y4 r& x+ e似乎一般家電應是 category II
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3 w: d# l' U+ {; ^; I; a( rIEC 60664-1
0 D! i: c7 ]2 p) R/ ]; S4.3.3.2.2 Equipment energized directly from the supply mains2 J+ `4 [8 c& z/ M
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Technical committees shall specify the overvoltage category as based on the following general explanation of overvoltage categories (see also Clause 443 of IEC 60364-4-44):
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3 B4 \( q% D! ?– Equipment of overvoltage category IV is for use at the origin of the installation.) l& }2 C% M7 ]( ~) }3 ~/ E4 f- S$ y
NOTE 1 Examples of such equipment are electricity meters and primary overcurrent protection equipment.
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/ c! J9 j* b( h9 v/ }# Y) b– 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.# u" Z2 e0 ^. `- B, \. K" s
NOTE 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.
0 I$ j9 M, U/ c( R) }6 @NOTE 3 Examples of such equipment are appliances, portable tools and other household and similar loads. If such equipment is subjected to special requirements with regard to reliability and availability, overvoltage category III applies.8 Y1 y5 X, g+ {" {
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– 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. These measures shall ensure that the temporary overvoltages that could occur are sufficiently limited so that their peak value does not exceed the relevant rated impulse voltage of Table F.1.
& l5 V$ v! |9 f* Q5 K; u$ u! INOTE 4 Examples of such equipment are those containing electronic circuits protected to this level, however see the note in 4.2.5.
# @1 r, L w7 _# eNOTE 5 Unless the circuits are designed to take the temporary overvoltages into account, equipment of overvoltage category 1 cannot be directly connected to the supply mains. |
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