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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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    The use of the terminology in this way pervades IEC and CENELEC standards.


    It seems the terminology is used in this way, rather than saying "don't re-combine neutral and earth downstream of a point at which they've been separated" type of statement.


    Having said that, with prosumers electrical installations, we will need to reconsider how we use terms like "downstream" going forward !
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  • 0
    The use of the terminology in this way pervades IEC and CENELEC standards.


    It seems the terminology is used in this way, rather than saying "don't re-combine neutral and earth downstream of a point at which they've been separated" type of statement.


    Having said that, with prosumers electrical installations, we will need to reconsider how we use terms like "downstream" going forward !
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