You can't. The 120 volt GFCI is probably just a 2-wire (hot, neutral and ground) You would have to run a new 3-wire (2 hots, neutral and ground). The two hots are how you get the 240 volts (120+120=240). Also you must make sure the wire is gauged properly. #10 wire for 30 amps, #12 wire for 20 amps, etc.
Yes, GFCIs can be installed on 240 volt circuit. GFCIs protect against electric shocks from ground faults. They trip the circuit if the current is more than a certain level.
yes
A load of 1600 watts should be placed on a 20 amp 120 volt GFCI outlet.
Only if the cable going to your well pump is a three wire. The third wire could carry the neutral and you will have 120 volts from either 240 leg to the neutral.
No, not a good idea. You have to use a 347 volt ballast.
Should be about 120 VAC.
yes
A load of 1600 watts should be placed on a 20 amp 120 volt GFCI outlet.
Yes <<>> In North America, a three wire 120/240 volt system uses a neutral wire. For 240 volts two "hot" wires are used with no neutral.
Answer for USA, Canada and countries running a 60 Hz supply service.A three wire installation provides a power source for independent 120 volt circuits and 240 volt circuit with neutral.A common 120/240 volt 200 amp distribution service panel can have 42 circuits supplied from it. These circuits can be in any number of different combinations of 120 volts or 240 volts.
Only if the cable going to your well pump is a three wire. The third wire could carry the neutral and you will have 120 volts from either 240 leg to the neutral.
No, it must be on a dedicated circuit of it's own. It must be on AWG 12/2 wire with 20 amp breaker. It also must be protected with a GFCI outlet.
Yes, but it will not work.
No, not a good idea. You have to use a 347 volt ballast.
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First of all there is no common three phase 120 volt service. There is in North America a three wire 120/240 volt single phase service. That being said, if you want to change a 120 volt source to 240 volts it must be done with a transformer. Its classification is a step up transformer. The primary side of the transformer H1 - H2 will be connected to the 120 volts. The secondary side of the transformer X1 - X2 will be connected to the 240 volt load. The transformer is sized by the current required by the 240 volt load.
A four wire plug suggests to me that it is for split voltages. 120/240, hot - neutral - hot - ground will be the four blade connections for shore power in the US. With UK shore power three wire there will be no neutral as you know it. 120 volt equipment will not work. If there is a special berth for 120/240 shore power that is what you will need to tie up to.
Should be about 120 VAC.