Is it possible to convert a 220vac, 10AWG, line with only 2 black hot wires and a bare ground wire to a 110vac line? Can the source at the main junction box, which has a 2-pole CB, be rewired to replace the 2-pole breaker with a 1-pole breaker and grab the neutral at the main box by connecting one of the black wires to neutral at the box?
Is it to code to use one of the 2 black hot wires as a neutral?

Tape the 1 wire with white tape at both ends, connect one end to neutral bar, the other to the white screw on the receptacle, install 1 20 amp single pole breaker.
You will have to wirenut a short piece of # 12 to allow making it around the screws.

Absolutely not!

Neutral conductor insulation can be Gray (usually used in commercial installations) or White.

Please see NEC 2008, Chapter 2 article 200.6 (Neutral Identification) and 200.7 (Use of White or Gray)

Can you remove a 240 circuit and use one of the spots for a new 120 VAC circuit breaker, yes. However, you can only use a 20A or 15A breaker. You could use the cable that is installed already if it were a Black/White and bare ground. However, you would have to pigtail the receptacle to the 10AWG cable because it will not attach properly to the receptacle.

P.S. You are also required to cover the empty slot in the panel by using a blank on the panelboard cover grill.

If you get a 12 vdc power supply that will accept 220 vac 50 Hz (LED POWER SUPPLY) you take the 12 vdc output and connect it to a 120 vac inverter that runs off 12 vdc. A 12 vdc 30 amp power supply will provide enough power to run a 360 watt inverter. This will allow you to run equipment that needs 120 vac 60 hz off 220 vac 50 hz like in AU. You can wire the power supply to the inverter, tape the two together and you have a nice small package that will provide 120 vac 60 HZ for such things like motors that require 60 HZ, or other equipment rated at 120 vac 60 HZ. The cost of power supplies have come way down due to their use for LED power sources. Likewise, 360 watt inverters can be purchased for under $30. The total cost of a 360 watt
Power system can be just over $50. Easy to do, and works great.

Hank Wolfla
Greenfield, IN
Sept. 2016

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Originally Posted by hwolfla

If you get a 12 vdc power supply that will accept 220 vac 50 Hz (LED POWER SUPPLY) you take the 12 vdc output and connect it to a 120 vac inverter that runs off 12 vdc. A 12 vdc 30 amp power supply will provide enough power to run a 360 watt inverter. This will allow you to run equipment that needs 120 vac 60 hz off 220 vac 50 hz like in AU. You can wire the power supply to the inverter, tape the two together and you have a nice small package that will provide 120 vac 60 HZ for such things like motors that require 60 HZ, or other equipment rated at 120 vac 60 HZ. The cost of power supplies have come way down due to their use for LED power sources. Likewise, 360 watt inverters can be purchased for under $30. The total cost of a 360 watt
Power system can be just over $50. Easy to do, and works great.

Hank Wolfla
Greenfield, IN
Sept. 2016

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Why spend the money when all you need to do is make 1 wire white and possibly pigtail a wire or two?

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Originally Posted by ma0641

Why spend the money when all you need to do is make 1 wire white and possibly pigtail a wire or two?

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Hank could also check the dates of the posts he is replying to and see that it is six years old.

Dummie Brian too!