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Tool Talk Discussion Forum

Re: BD, How does the transfer box with the few breakers work

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JD Seller

07-26-2013 12:36:38

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JohnT your are correct in that cost is an issue in this application. This is on the youngest son's house. So he has two kids and money is limited right now. Also the house in question is older and very well could be replaced not far down the road. So do not want to go hog wild to only have to redo it in a few years down the road.

I will enact the "Don't ask and do not tell" rule on how he has been doing it. LOL

This is why I wanted an economical way to correct his current way of doing it. Plus I have an extra 7500 watt gas generator that has electric start. It is one out of a RV so it does not have any wheels or anything. So it is just setting not being used. So I am thinking a little enclosure for weather protection plus a box and switch interlock set up, his wife could make it work safely if he was not home.

Thinking a small metal box/shed 20-30 feet away from the house. A good heavy cord hard wired to the generator. So all you would need to do would be open the enclosure. Hook the cord to the house box. Start the generator. Then go to the main breaker box and flip the main off and the generator breaker on. Interlock to make sure you do it correctly. Flip off all the breakers you don't need and you should be good to go.

I think it would be a cheap but safe setup and is what I am trying to help him get.

PS the generator is setup for propane. So Away from the house would allow me to tie it into the propane tank much easier.

OK guys pick this apart so I can see what I need to change. LOL

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John T

07-26-2013 15:13:31

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 Re: BD, How does the transfer box with the few breakers work in reply to JD Seller, 07-26-2013 12:36:38  
NOPE, NO NIT PICKING, sounds like a reasonable cost effective method to me JD. A few thoughts:

Since its a 7500 instead of a 4000 and out of an RV my best "guess" is its indeed 120/240 volt which is great as the smaller RV gensets are only 120 volt. Smaller RV's use a 120 volt 30 amp (2 pole 3 wire grounding) plug, while the big boys with 2 roof AC's use a 240 volt 50 amp (3 pole 4 wire grounding) plug that has both Hots, Neutral and Ground. One AC works on one 120 VAC leg, other AC the other.

Sorry, I just dont know if it has its Neutral floating or not (i.e. it has a connection to the case frame), but since youre only using a two pole (2 pole backfeed breaker) transfer method, the gennys Neutral needs to be unattached from its case/frame and then when you get to the house panel it, of course, wires to the panels Neutral Buss. The Equipment GroundING Conductor (bare/green) runs out of the panel and wires to the gennys case/frame.

Be sure the enclosure is ventilated enough for that air cooled genset. Many of those RV gensets already have a fan on one end which vents to the outside so Im sure you can get that figured out


John T

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