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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
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?
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    "Testing a 30mA RCD at 5 times In, is not enough to be truly sure of this " agreed
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    "Testing a 30mA RCD at 5 times In, is not enough to be truly sure of this " agreed
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