Talk:Ufer Earthing

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Revision as of 02:03, 16 June 2007 by John Rumm (talk | contribs)
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The bit that says "Ufer earthing equipotentially bonds a house's concrete slab floor to the electrical earthing system, eliminating the risk of shock from the CPC or equipotential bonding to floor. This risk exists with TT systems where a floor slab is damp, and to a lesser extent with PME supplies."

could do with a bit of refinement I think. "Risk of shock from the CPC" I suspect you are referring to reducing shock risks from "indirect contact" caused by high touch voltages present on earthed metalwork in the property, when a phase to earth fault exists.

This risk is *lowest* with TT systems due to the level of RCD protection.

The need for EQ bonding on PME supplies is the greatest, and having multiple redundant earth connections is a "good thing" since it reduces touch voltage should the suppliers neutral connection be disconnected.

--John Rumm 03:03, 16 June 2007 (BST)

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