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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 must say I disagree, I see no difficulty in saying the post-metering part of a TNC-s installation has separated neutral and earth (SNE in UK DNO-speak), and the pre-metering part has combined neutral and earth. (CNE in DNO-speak)  and defining TNCs that way.

    If not we have to invent some new words.

    It has in the past been suggested on this previous forum that we could extend the notation and use upper and lower case to distinguish the DNO and consumer side respectively, so TNCS has the separation in the street, so presents as TNS at the meter cupboard, while  TNCs has it at the cut out. I do not think that has caught on..

    Mike.

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    I must say I disagree, I see no difficulty in saying the post-metering part of a TNC-s installation has separated neutral and earth (SNE in UK DNO-speak), and the pre-metering part has combined neutral and earth. (CNE in DNO-speak)  and defining TNCs that way.

    If not we have to invent some new words.

    It has in the past been suggested on this previous forum that we could extend the notation and use upper and lower case to distinguish the DNO and consumer side respectively, so TNCS has the separation in the street, so presents as TNS at the meter cupboard, while  TNCs has it at the cut out. I do not think that has caught on..

    Mike.

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