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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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    I think the argument against this view, Mike, is that the letters describe the system, that is, the whole system, from transformer to the point in question, not just the installation. Based on that, it would be wholly incorrect to describe part of a TN-C-S system downstream of the TN-C element "TN-S"
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    I think the argument against this view, Mike, is that the letters describe the system, that is, the whole system, from transformer to the point in question, not just the installation. Based on that, it would be wholly incorrect to describe part of a TN-C-S system downstream of the TN-C element "TN-S"
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