in regards to the 2391 practical.....
1, for the external earth fault loop impedance, do you disconnect the earth coming into the 3 phase db from the main earth terminal? have heard conflicting methods of this, some saying yes because of the pp's and some saying no because its a test board????
2, similarilly, when doing the ze at the single phase cu do i disconnect the earth from the earth terminal in the single phase cu or leave it in??
1, for the external earth fault loop impedance, do you disconnect the earth coming into the 3 phase db from the main earth terminal? have heard conflicting methods of this, some saying yes because of the pp's and some saying no because its a test board????
2, similarilly, when doing the ze at the single phase cu do i disconnect the earth from the earth terminal in the single phase cu or leave it in??