This is in relation to Annex A722.
The calculation for minimum resistance to earth for a three-phase charging installation in A722.3 Earth electrode resistance is:
Note that Im is the maximum neutral current as calculated in A722.1.
And if or the calculated RAev is >200Ω then the above equation should be ignored and the max RAev is 200Ω.
Just from logic and by reading the second requirement, it seems to be that a normal situation would be for Im to be < 70(IL1 + IL2 + IL3)/U0Cmax. However, if that is the case, then in normal situations the required maximum resistance to earth comes out as a negative number.
Am I missing something here?