In New Zealand we use the AVO-Megger LT 310 Loop Impedance Tester on the 230 volts MEN system. The best way to test is to use a loop impedance tester instead of relying on neons which can give you false readings. This one imposes a test current between the phase and neutral and earth. It will tell you in Ohms and kiloAmps what fault level is available. it will also confirm that the polarity is correct.
The product of rotation, excitation and flux produces electricty.
