|
2.7.3 Short-circuit backup protection(EN60950 2.7.3)
2 ?5 E# U) O1 X( ~Unless appropriate short-circuit backup protection is provided, protective devices shall have2 r" t) f2 V; m) u) E9 `9 {
adequate breaking (rupturing) capacity to interrupt the maximum fault current (including shortcircuit+ D1 F1 u' Y" `4 o$ O) ]) W- e
current) which can flow.3 k+ V, W) x' Q/ W
For PERMANENTLY CONNECTED EQUIPMENT or PLUGGABLE EQUIPMENT TYPE B, it is permitted for
! I1 Y9 Z* |8 fshort-circuit backup protection to be in the building installation.1 @& X8 r2 g+ G$ r3 K8 V
For PLUGGABLE EQUIPMENT TYPE A, the building installation is considered as providing shortcircuit
7 H8 w. u+ m) x5 R0 o- nbackup protection7 w, x& _. H. S) ?' p4 g9 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
1 n: q* \5 m% e1 ~流过的最大故障电流(包括短路电流)。
0 h. x5 l# [& D5 m1 h8 G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。
# X7 P9 R3 ]4 w9 A. e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
5 c6 e! k$ s9 N K8 M, r
$ \1 J4 M8 v# t0 D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 |
|