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The maximum permissible disconnection time is 0.4 s in TN system. Why and from where this value (0.4 s) is obtained?
Former Community Member
The maximum permissible disconnection time in in the event of a short circuit between a phase conductor and a body or protective conductor or a protective-neutral conductor is 0.4 s in TN system. Does anybody know this value (0.4 s) obtains from where? How this value is obtained?
That's true of course but the OP wanted to know the origin of the 0.4s disconnection time. It probably also explains the 0.2s specified for the TT system. What remains for us to establish the is the origin of the 5s and 1s disconnection times.
That's true of course but the OP wanted to know the origin of the 0.4s disconnection time. It probably also explains the 0.2s specified for the TT system. What remains for us to establish the is the origin of the 5s and 1s disconnection times.
