- Reaction score
- 36
Hi all , im new here but have always looked for answers over the months
description of my question
there is an external 100 amp 3 phase metered head that this new 10 bed house is to be fed from , the builders installed a 35mm 4core swa as i directed however they forgot about a 16mm earth
now is my only option to treat this a a tt supply or a really stupid question is can i simply make it a pre from the neutral at my distribution board (as it would be the same as whats at the source ) obviously not but it would definatly be easy
now over the last 20 or so years i have not ever done a tt supply (not since collage anyway) do i need to drop earth rod then cover the new 3phase dis board with a 30 ma main switch or can i install 100ma main switch and then protect all circuits with planned rcbos as original plan
also one more thing , was i right in thinking that i was never allowed to take the earth from the pme head regardless to if the builder had remembered the earth ?
so many questions
and thanks
description of my question
there is an external 100 amp 3 phase metered head that this new 10 bed house is to be fed from , the builders installed a 35mm 4core swa as i directed however they forgot about a 16mm earth
now is my only option to treat this a a tt supply or a really stupid question is can i simply make it a pre from the neutral at my distribution board (as it would be the same as whats at the source ) obviously not but it would definatly be easy
now over the last 20 or so years i have not ever done a tt supply (not since collage anyway) do i need to drop earth rod then cover the new 3phase dis board with a 30 ma main switch or can i install 100ma main switch and then protect all circuits with planned rcbos as original plan
also one more thing , was i right in thinking that i was never allowed to take the earth from the pme head regardless to if the builder had remembered the earth ?
so many questions
and thanks