Yes. Just connect the black wire to one of the poles and the white wire to the white bus bar. Make sure the wire you use is sized for the ampere rating of the breaker. 15 A = 14 AWG, 20 A = 12 AWG and 30 A = 10 AWG.
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No. Three phase power must be supplied to you from your electric utility, or you can get a phase convertor.
To get three phase 220v from 440 you need to have a 440 to 220 three phase transformer installed. Cost is not prohibitive most depending on what KV is required are in the $500.00 range.
On the North American electrical system, no. A single pole breaker feeds a load to the neutral wire with 120 volts. It takes two breakers to obtain a 240 volt potential.
A 220 VAC breaker can be single pole or double pole depending on the application. For standard 220 VAC circuits like most household appliances, a double pole breaker is typically used. However, in certain situations where only one hot wire is needed, a single pole breaker can be used for 220 VAC circuits.
I assume you have a 30 amp two pole 220 volts breaker. Check the voltage source. If the source voltage is 220V, but out let voltage is 120 then the breaker must be faulty, a high resistance or partial open circuit could have caused the reduced voltage at the breaker outlet.
The equation that you are looking for is I = W/E. Amps = Watts / Volts.
Yes, a double pole 20 amp breaker can be used with 12-2 wire for a 240V circuit. However, make sure the device you are connecting requires 240V and not 120V. Also, consult local electrical codes and regulations to ensure compliance with safety standards.
Answer for USA, Canada and countries running a 60 Hz supply service.Breakers are rated in amperage and by the amount of poles that they have. Your classification of a 220 breaker is described in electrical terminology as a two pole breaker.Choosing the amperage of the two pole breaker depends upon the 220 volt load that it feeds.Two pole breakers for 220 volt loads.Single pole breakers for 120 volt loads.If the service is only 120 volt then every other bus bar in the panel will be energized. If the panel is a 120/240, then every bus bar in the panel will be energized.This is how and why a 240 volt load requires a two pole breaker.To the answer, yes you an use a two pole breaker in a 120 volt service but only one side of the breaker will have voltage on it depending on where it is situated in the panel board.