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. 

I want to insert "part of" after "shall be".


Alternatively, given the prohibition of N-E connexions after the meter, all final circuits may be regarded as being TN-S, but it cannot mean that.


Perhaps it does mean that there should be an isolating transformer.

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. 

I want to insert "part of" after "shall be".


Alternatively, given the prohibition of N-E connexions after the meter, all final circuits may be regarded as being TN-S, but it cannot mean that.


Perhaps it does mean that there should be an isolating transformer.