From my literature review and understanding, these are my comments.
The settings depends on the application. For a balanced load 10-20% of the system rated current is sufficient. For hazardeous areas, the leakage current should not exceed 15% of the rated current of the circuit or 5A, whichever...
It may be correct but the following comments apply:
In case of fault, the equivalent impedence is Ze=Z/n, where Z is the impedence when 1 unit is grounded, n umber of units in operation. Then , ground fault currents are higher.
You may have unbalance current circulating between units when 2 or...
