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Earthing neutral

Former Community Member
Former Community Member
Why is it forbidden to earth the neutral at the source of a 3 wire system? 


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    Actually your diagram is a little different to the one in BS 7671 (in appendix 9) - I'm guessing yours is the IEC original and the one in BS 7671 has been 'modified by committee'. Does yours have a title or description that refers to the Earthing system?




    The BS 7671 ones - both with a distributed N (Fig 9A) and without (9B) appear identical in earthing arrangements (TN-S to my eyes) but in BS 7671 9A is tagged TN-C-S and 9B TN.  I wouldn't have put it passed the UK committee/typesetters to have got things confused - they seem to have replaced the note/key references (a) to (d) with (1) to (4) so they don't match the diagrams any more.



      - Andy.
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  • 0


    Attached files





    Actually your diagram is a little different to the one in BS 7671 (in appendix 9) - I'm guessing yours is the IEC original and the one in BS 7671 has been 'modified by committee'. Does yours have a title or description that refers to the Earthing system?




    The BS 7671 ones - both with a distributed N (Fig 9A) and without (9B) appear identical in earthing arrangements (TN-S to my eyes) but in BS 7671 9A is tagged TN-C-S and 9B TN.  I wouldn't have put it passed the UK committee/typesetters to have got things confused - they seem to have replaced the note/key references (a) to (d) with (1) to (4) so they don't match the diagrams any more.



      - Andy.
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