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EV TN system

lyledunn
722.312.2.1 in IS10101:2020 has only one stipulation and ignores all the TN-C-S issues highlighted in BS7671 2018 A1 regarding PME even though the vast majority of installations in Ireland are PME.

It says; "In TN system, the final circuit supplying a connecting point shall be a TN-S system". A rather unusual way of putting things. It sounds almost like a bit of bad translation. More to the point, I always thought that unless you had an intervening transformer TN-S referred to the whole system from source to final connected equipment.
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    Yes Andy, that misconception is even perpetuated with a multiple choice question by City and Guilds in the 2391exam asking “what earthing system has TN-C as the supply and TN-S as the arrangement in the installation?” 

    I can’t comment on the robustness of the PME installations in Ireland other than to say that in the new housing developments I have seen, significant efforts are made in the infrastructure to keep system neutral at earth potential.

    I rather think, like other European countries, Ireland tends not to see loss of system neutral in the EV roll out as an issue of concern. That would seem to imply that it is the U.K. that has the unreliable system.



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    Yes Andy, that misconception is even perpetuated with a multiple choice question by City and Guilds in the 2391exam asking “what earthing system has TN-C as the supply and TN-S as the arrangement in the installation?” 

    I can’t comment on the robustness of the PME installations in Ireland other than to say that in the new housing developments I have seen, significant efforts are made in the infrastructure to keep system neutral at earth potential.

    I rather think, like other European countries, Ireland tends not to see loss of system neutral in the EV roll out as an issue of concern. That would seem to imply that it is the U.K. that has the unreliable system.



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