Discuss Main bonding at outbuilding in the Commercial Electrical Advice area at ElectriciansForums.net
I understand the 50mm required is copper.
I have seen a chart which suggests the SWA is equivalent to 33mm of copper.
www.earthingnuts.co.uk/pdf/pvc_xlpe.pdf
I understand what you mean re isolating the TNCS, however I am reluctant to abandon a good earthing system in favour of a potentially unreliable TT system (in London).
Im not aware why it can't be used if its size and structural integrity are sound then why not? Its a conductive path of suitable low impedance and structurally solid.
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