Hi all
Just wondered if someone would be able to give me some advice regarding earthing.
I've had the DNO out recently to have a survey done to replace my service head from the old cast iron one we have. My current earthing is TNS however the current earth cable is just strapped on the incomming pipe. DNO said this does not provide sufficient earthing. They also warned that on replacing the head they would possibly have to leave my installation unearthed if there was not enough slack on the cable in the pipe to get to the lead sheath within and that I'd have to get an electrician to install an earth electrode and make it a TT system.
When I asked about changing it to a TN-C-S PME arrangement, they said this would require pulling in a new cable?
My understanding of TN-C-S is that the earth and Neutral are combined in the DNO supply cable out in the street so the neutral can be separated and used as an earth from the service head? Is my understanding correct? And if so is it just a case the neutral and earth being connected together in the new service head? I do know a few of my other neighbours have a TN-C-S arrangement so i'm fairly sure this is available in my area.
Many Thanks!
Just wondered if someone would be able to give me some advice regarding earthing.
I've had the DNO out recently to have a survey done to replace my service head from the old cast iron one we have. My current earthing is TNS however the current earth cable is just strapped on the incomming pipe. DNO said this does not provide sufficient earthing. They also warned that on replacing the head they would possibly have to leave my installation unearthed if there was not enough slack on the cable in the pipe to get to the lead sheath within and that I'd have to get an electrician to install an earth electrode and make it a TT system.
When I asked about changing it to a TN-C-S PME arrangement, they said this would require pulling in a new cable?
My understanding of TN-C-S is that the earth and Neutral are combined in the DNO supply cable out in the street so the neutral can be separated and used as an earth from the service head? Is my understanding correct? And if so is it just a case the neutral and earth being connected together in the new service head? I do know a few of my other neighbours have a TN-C-S arrangement so i'm fairly sure this is available in my area.
Many Thanks!