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2.7.3 Short-circuit backup protection(EN60950 2.7.3)# B, W6 C6 Q, x- _; N
Unless appropriate short-circuit backup protection is provided, protective devices shall have) u5 y2 ]% m( x7 i) r: z# I
adequate breaking (rupturing) capacity to interrupt the maximum fault current (including shortcircuit7 O; @$ E) S$ v, F) I
current) which can flow., L; O7 ?* Z6 x$ o/ I7 f$ H0 `
For PERMANENTLY CONNECTED EQUIPMENT or PLUGGABLE EQUIPMENT TYPE B, it is permitted for% T7 b# ~, O' I. j) R; n$ r7 d
short-circuit backup protection to be in the building installation.
8 Q* f# d$ x; D7 h6 eFor PLUGGABLE EQUIPMENT TYPE A, the building installation is considered as providing shortcircuit- S) u4 y5 z2 e" f
backup protection! Z* W0 E9 o, _8 E7 x8 S
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 Z2 j. W8 ^8 S0 q6 g
流过的最大故障电流(包括短路电流)。1 O$ D- ?1 H. Z0 l2 |
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。/ K) q0 U) z" {# k5 Z g) ~1 D. k
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; [) O- ~. l+ z
+ R8 ~3 H; L1 T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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