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Earthing neutral

Former Community Member over 5 years ago

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

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0 Former Community Member over 5 years ago

OMS:

ProMbrooke:

Ok- but what is the theory behind keeping a PE insulated? I know I keep asking because to be frank those behind BS7671 know WAAYYYY more than I do.

1 - To limit the impression of the HV side fault appearing on the LV Neutral - ie the Rise of Earth Potential transfer voltage

2 - To ensure it is only earthed at one point - if it were bare (and buried) then it would effectively be multiple earthed

Regards

OMS

Again, I see no harm in multiple earthing of a PE.

I agree about HV fault current being imposed into LV, but if the decision has been made to tie the HV PE into the LV PE then a bare PE would not make any difference.
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0 Former Community Member over 5 years ago

OMS:

ProMbrooke:

Ok- but what is the theory behind keeping a PE insulated? I know I keep asking because to be frank those behind BS7671 know WAAYYYY more than I do.

1 - To limit the impression of the HV side fault appearing on the LV Neutral - ie the Rise of Earth Potential transfer voltage

2 - To ensure it is only earthed at one point - if it were bare (and buried) then it would effectively be multiple earthed

Regards

OMS

Again, I see no harm in multiple earthing of a PE.

I agree about HV fault current being imposed into LV, but if the decision has been made to tie the HV PE into the LV PE then a bare PE would not make any difference.
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