Ufer Earthing
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Using Ufer Earthing in conjunction with the standard earth rod brings 3 main advantages:
- Much lower TT earth resistance makes the house earthing system safer and more effective.
- 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, and to a lesser extent with PME supplies.
- Lastly a Ufer earth means the house has 2 earths, and loss of a connection to either one does not leave the building with no working earth.
Ufer Earthing explained. Note that the site also discusses standard US grounding practices, which are not identical to ours.