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table 41.1 max. disconn. times and the extra notes

psychicwarrior
good day folks


"Where in TT systems the disconnection is achieved by an overcurrent protective device and the protective equipotential bonding is connected with all extraneous-conductive-parts within the installation in accordance with Regulation 411.3.1.2, the maximum disconnection times applicable to TN systems may be used."


Does this [also] imply that where protective equipotential bonding is not needed, then TN times can be used ?


And what reasons might there be for no similar relaxation of effectively 411.3.2.4 to 411.3.2.3  (1s to 5s  for other circuits not covered in 411.3.2.2 and in the light of the above extracted note to 411.3.2.2 Reg ) ?


Regards

Habs


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  • 0
    "And the answer is...."; Nope i  dont 'get it' @mapj


    I cant see in what you have said that suggests why the relaxation (use TN times instead of the more stringent TT times) cant be made for circuits not covered by 411.3.2.2.


    What is it between a 32A socket circuit that can be relaxed and for one example (there might be others), a 40A distrib  circuit that can not be relaxed.


    Perhaps I am at the limit of my now lazy and too simplistic mind I fear :-)


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  • 0
    "And the answer is...."; Nope i  dont 'get it' @mapj


    I cant see in what you have said that suggests why the relaxation (use TN times instead of the more stringent TT times) cant be made for circuits not covered by 411.3.2.2.


    What is it between a 32A socket circuit that can be relaxed and for one example (there might be others), a 40A distrib  circuit that can not be relaxed.


    Perhaps I am at the limit of my now lazy and too simplistic mind I fear :-)


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