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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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  • Former Community Member
    0 Former Community Member

    AJJewsbury:




    Not a PE in the diagram, but a PE in real life. I can not find or see any problems if earthing it multiple times.



    But it not just a PE, even in real life it's also a N - it's liable to be carrying current in normal service - even if in this case of not distributing N to the loads it'll still be carrying circulating currents. Remember that comment that it should be thought of as 'similar to a PEN'?


       - Andy.

     







    Where is that current coming from though? Are circulating currents really that bad in magnitude? Keep in mind they are not regulated nor restricted in TN-C-S which in theory would produce parellel current in orders of magnitude more.


    Mandating an insulated neutral would force 5 wires if the HV neutral must be tied into the LV neutral. 


    What about a wye-wye connection?


     

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  • Former Community Member
    0 Former Community Member

    AJJewsbury:




    Not a PE in the diagram, but a PE in real life. I can not find or see any problems if earthing it multiple times.



    But it not just a PE, even in real life it's also a N - it's liable to be carrying current in normal service - even if in this case of not distributing N to the loads it'll still be carrying circulating currents. Remember that comment that it should be thought of as 'similar to a PEN'?


       - Andy.

     







    Where is that current coming from though? Are circulating currents really that bad in magnitude? Keep in mind they are not regulated nor restricted in TN-C-S which in theory would produce parellel current in orders of magnitude more.


    Mandating an insulated neutral would force 5 wires if the HV neutral must be tied into the LV neutral. 


    What about a wye-wye connection?


     

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