Discuss Earthing Arrangements Explained + Photo's in the UK Electrical Forum area at ElectriciansForums.net
I found this comment on the IET forum (thanks Archy S): "Up in Scotland as one of the DNOs, CEW or (SEN) is a Continuos earth wire earthing system given to consumers who have an earth loop higher than 0.35 ohms. ie 3 wire single phase system consisting of a phase, neutral and a separate earth. If PME they'd just get a phase and a combined earth/neutral."
How's the earth actually made, and where does it join neutral (if at all).
I'm comparing with our supply, which is the same type of pole mounted 11kV transformer but in our case we're connected by underground split concentric to provide TN-S (DNO called this CEW as well). As explained by the DNO our transformer's neutral on the LV side is connected to an earth cable/rod/spike or something at the foot of the pole.
A previous house, served by overhead 240V, only had L and N overhead with a locally provided earth.
In this case, are they really providing Earth on an overhead cable?
That'd be TNS then. (?)
Further research needed, when I'm totally C[SUB]2[/SUB]H[SUB]5[/SUB]OH free!
"Up in Scotland as one of the DNOs, CEW or (SEN) is a Continuos earth wire earthing system given to consumers who have an earth loop higher than 0.35 ohms."
I'm not sure if it's the same thing he was meaning, but SSE publishes a target of max 0.35 ohms for TNCS, but up to 0.80 for TNS. It doesn't necessarily mean that TNS will be over 0.35 though, ours is 0.29.
You may be misunderstanding me, I'm not an electrician but I have taken a keen interest in our earthing arrangements because of the need to take supplies out to some outbuildings with a lot of extraneous metalwork so I made it my business to get a definitive answer.Hi aesmith, thank you for replies. I am only versed in basic electrics. Can you tell me were I should b looking to answer your question "how's earth made, and whre does it join neutral". I have a basic understanding of the more obvious systems TN-S etc. I could take more pics.
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