IEC电气装置蓝色安全保护防止过流保护(外文文献翻译).doc

IEC -2008
LOW-VOLTAGE ELECTRICAL INSTALLATIONS-3
Part 4-43: Protection for safety Protection against overcurrent
A protective device may be placed on the supply side of the reduced cross-sectional area or another change made, provided that it possesses an operating characteristic such that it protects the wiring situated on the load side against short-circuit, in accordance with .
NOTE The requirements of may be met by the method given in Annex D.
Omission of devices for protection against short-circuit
Provided that both of the following conditions are simultaneously fulfilled:
• the wiring is installed in such a way as to reduce the risk of a short-circuit to a minimum (see item b) of ), and
• the wiring is not placed close bustible material, devices for protection against short-circuit need not be provided for applications such as:
a) conductors connecting generators, transformers, rectifiers, accumulator batteries to the associated control panels, the protective devices being placed in these panels;
b) circuits where disconnection could cause danger for the operation of the installations concerned, such as those cited in ;
c) certain measuring circuits;
d) at the origin of an installation where the distributor installs one or more devices providing protection against short-circuit and agrees that such a device