As a point of interest - working the adiabatic equation backwards -

taking t as 0.1s and k as 115 as most modern domestic cases will be

a 10mm² earthing conductor is good for a Ze down to 0.06Ω and

a 16mm² is only good down to 0.04Ω .

It would seem that the 16mm² is very rarely required, if at all.
 
another few minutes, we can prove that a bit of wet string will do. :sunny:
 
judging by some of the Ra values i've seen lately, more than adequate.
 
The DNO are only responsible to the meter, anything from the outgoing side is our responsibility ........ But they seal it and we are not allowed to cut them to inspect the connections on our side...... Hmm, so tell them to leave you an isolator to connect to
 
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Adiabatic Equation
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Electrical Wiring, Theories and Regulations
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2glasseyes,
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malcolmsanford,
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