Getting 120v from 240v circuit?


Old 11-29-19, 02:47 AM
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Getting 120v from 240v circuit?

I have a large shed in my back yard and I would like to have more power out there. Right now it only has one 15A 120v circuit. The wire to the shed is only 2 conductor (with ground) and it's buried in the ground for over 100 feet. I really do not want to have to bury a bigger wire.

If I used the existing wire, I could double the voltage and make it 240v, thereby doubling the wattage. Unfortunately I need 120v and there is no neutral wire. Is there any other way to tap only one leg to get 120v X2 circuits? I know you're not supposed to use the ground for this, but what if I drive a new ground rod next to the shed and unhook the ground on the other end? Or is it possible to make a "fake" neutral by using a GFCI device?

To sum things up - I want to convert a 120v circuit to 240v for more wattage.from the panel, and then wire it as 2 separate circuits in the shed back down to 120v...but I have no neutral wire to do this.
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Old 11-29-19, 03:58 AM
Join Date: Nov 2015
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You cannot do what you want without neutral and you cannot use ground as a neutral. GFCI doesn't create fake neutral. GFCI is just a ground fault protection. Driving ground rod will not create neutral and new ground rod still needs to be bonded to ground from your house.

There really is only 2 way I can think of.
1. Run new cable.
2. Install 240V to 120V auto transformer. (will need something big enough for what you plan to put on it)
Old 11-29-19, 06:07 AM
Join Date: Sep 2002
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A new cable is really your only option.
CasualJoe voted this post useful.
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