I just read the rest of your questions...<br><br>120/240 volt, three-phase voltage would indicate 120 volts from leg to neutral and 240 volts from leg to leg.<br><br>Based on my above post, and assuming a 5kVA single phase heater (basically 5000 watts), the following should hold...
First of all, both voltages that you refer to are considered single-phase. Assuming a 120/208 volt, three-phase voltage -- three voltage configurations are possible.<br><br>The first is 208 volt, three-phase which is obtained by connecting to all three legs. This is the...