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Tractor Talk Discussion Forum

Re: Generator test, one more time

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David G

07-10-2014 11:07:10
12.130.116.70



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A 120V generator will not work with 240V by hooking the phases together, it will feed all 120V circuits, but not 240.

240VAC is 2 120VAC circuits 180 degrees out of phase.




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Milan

07-10-2014 11:12:42
173.31.220.124



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 Re: Generator test, one more time in reply to David G, 07-10-2014 11:07:10  
I realize that, I guess I did not make myself clear, I can easily do without the air conditioner, it would effectively see "0" volts seeing as both lines would be connected together.

But, everything else in the house would still see 120.

I will admit, I have done this many times, connect both phases together, then feed them both with the same one 120 volt hot lead from the generator and connect the other wire from the generator to neutral.

Works. But, I want to get away from backfeeding and do things legal and proper.

Basically, they are saying that there is no legal way to connect to the house wiring with a 120 volt generator.

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Ken Macfarlane

07-10-2014 11:29:11
142.166.168.2



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 Re: Generator test, one more time in reply to Milan, 07-10-2014 11:12:42  
Yes there is, move your 120 V loads to a small transfer switch/generator subpanel. You can't move all of them, just important ones. When power is out it will let you switch those loads over to your generator.

If you move too many, on regular power your L1 L2 would be out of balance which is not good. Happens by chance in some panels by nature of North American power setup so there is some tolerance.

Shouldn't be backfeeding your panel really, especially if asking basic questions about how 120/240 works.

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Milan

07-10-2014 11:57:26
173.31.220.124



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 Re: Generator test, one more time in reply to Ken Macfarlane, 07-10-2014 11:29:11  
Gosh, guys, I am sorry, I apologize, I did not make myself clear.

I am not touting the wisdom of connecting the phases together, not at all.

I did mention that I have done this several times, and it works quite well, but, that is not the point of my original post.

I thank each of you who have responded so far, and I know each of you are right and correct in everything said so far.

But, you are all missing my point.

My point is, I want to get away from backfeeding like this, and want to connect my 120 volt generator to the house with a transfer switch in such a way that I can feed the entire house.

I am just stating that I have effectively done this many times by the method I described, so I know my 2800 watt generator can power up everything I need in an emergency power out situation.

I just want to do it legally and properly with a transfer switch and not switch individual circuits.

That is my only point and several electricians say it cannot be done, that they want no part of connecting a 120 volt generator to house wiring.

That's my only point. I was just soliciting comments on using a single transfer switch with a 120 volt generator.

They would not install one to even power up one side.

So, am I to assume that a guy with a 120 volt generator is limited to transfer switches for individual circuits or using extension cords?

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JMOR

07-10-2014 12:09:03
72.181.173.171



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 Re: Generator test, one more time in reply to Milan, 07-10-2014 11:57:26  
Quoting Removed, click Modern View to seeSee my other post. For reasons given there, I understand why they won't do it. You don't sound like an electrical do-it-yourself'er, but the diagramming is simple, however, there is a lot of work to install & if you are in some jurisdiction that does not allow such & must have an electrician perform the work, then you are probably SOL unless you can show/convince/otherwise to get him to sign on.

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Billy Shafer

07-10-2014 14:15:21
173.184.21.29



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 Re: Generator test, one more time in reply to JMOR, 07-10-2014 12:09:03  
I am staying out of this one.



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