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Tool Talk Discussion Forum

OT---- Floating Neutral

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1945 A

08-15-2005 09:17:00




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The 240 volt receptacle on my portable generator set has a note saying "Floating Neutral".
What exactly is it referring to?
There are two seperate 120 volt receptacles with 20 amp breakers, and 1 240 volt receptacle that takes a twist-lock plug.
My plan is to use each of the 120 v in my small cabin. How would you go about providing a ground circuit? I used my meter to check the twist lock receptacle, and got 125 V phase to neutral, 254 V phase to phase, but a strange, very low voltage from phase to the ground lug....

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buickanddeere

08-15-2005 12:46:51




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 Re: OT---- Floating Neutral in reply to 1945 A, 08-15-2005 09:17:00  
Your generator is set-up for connection to a building service. The generator chassis is connected to the grounding system. The only neutral to ground bond will be in the service panel. Foe connecting to portable plug in equipment the neutral and chassis need to be bonded together to keep the live line from floating. The chassis should be bonded to a good earth ground too. Is there a drilled well nearby. Or a deep earth trench available?

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1945 A

08-15-2005 13:44:07




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 Re: OT---- Floating Neutral in reply to buickanddeere, 08-15-2005 12:46:51  
I don't have a well, or a deep earth trench yet.
Would a grounding rod serve the purpose of supplying a ground for the system? Should I also put in another grounding rod for the building?
My plans call for eventually having permanent power. I'm just trying to maximize the capabilities of this generator.



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Richard H.

08-15-2005 21:09:43




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 Re: OT---- Floating Neutral in reply to 1945 A, 08-15-2005 13:44:07  
To get a better understanding of what buickanddeere is saying google "generator floating neutral" He is right about what he is saying, but it sounds like your building a new cabin. So if you do have a new well put in, odds are it will be done in plastic pipe. So that"s out. What I have done to my place and I recommend you can do is locate the nearest place to your service entrance at the cabin and drive 3- 10" rods, 6 feet apart in a triangle shape. Connect all 3 together and then center tap one side to go to your panel, and if your power company wants a ground at their meter base there it is. This would be a permanent grounding electrode. With that said if you do use a steel casing for the new well that would be the best choice. When you put the recepticles in the place please use GFIs. Richard

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buickanddeere

08-15-2005 20:45:49




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 Re: OT---- Floating Neutral in reply to 1945 A, 08-15-2005 13:44:07  
When installing the grounds. Leave yourself the ability to hook from the service panel ground to the well casing. Don't make turns less than 3 ft in dia with the ground wire. A minimum of two 10 ft ground need to be driven in at least 10 ft apart. Are you pouring any concrete footings, walls etc?



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