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2.7.3 Short-circuit backup protection(EN60950 2.7.3)- J" S- k4 \5 r# @3 c$ n( p5 L! t
Unless appropriate short-circuit backup protection is provided, protective devices shall have
) l7 F' C4 y5 |) T. f; Tadequate breaking (rupturing) capacity to interrupt the maximum fault current (including shortcircuit
) B9 w/ f/ Z; c8 _current) which can flow.
' i+ [" W* o7 n. {6 A GFor PERMANENTLY CONNECTED EQUIPMENT or PLUGGABLE EQUIPMENT TYPE B, it is permitted for& @2 M, S i& T+ J. Y
short-circuit backup protection to be in the building installation.' W; o/ X, L f" ~
For PLUGGABLE EQUIPMENT TYPE A, the building installation is considered as providing shortcircuit
) P+ k+ M6 q6 j* H5 hbackup protection
' b4 l8 n" ~# @# P- o除非具有适当的短路后备保护装置,保护装置应当具有足够的分断(遮断)能力,能切断可能
! S" i, {( t/ U2 I8 L' U' _流过的最大故障电流(包括短路电流)。' l3 {2 N2 z; @, t$ I1 ?; h/ e
对永久性连接式设备或B型可插式设备,允许在建筑设施中提供短路后备保护装置。
^1 |& y* y+ n9 S1 Q: |1 x对于A型可插式设备,可认为建筑设施提供了短路后备保护8 I: o/ y! @% \1 {8 a
6 k, r( ~; @8 {6 v% g, ~按这句话的意思是,设备可以不用保险丝,但仍然不是很确定,望高手解答 |
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