Ask Experts Questions for FREE Help !
Ask

Generator Help

Asked Dec 12, 2006, 06:13 PM — 14 Answers
OK, next question. I have bought a 6000 watt generator. It has four 110 outlets and one 220 "twist style" outlet. What I want to do is wire it into my house temporarily during winter power outages. I know already it will not run my entire house. We have two sets of gas logs, so heat is not an issue. What I really want it to do is run the fridge and one or two maybe rooms of light ( we usually use small lamps in rooms anyway 40 watt) and the TV and DVD player. The way I intend to do this is to first of all throw the main breaker at my entrance to prevent back feeding. Then I want to get a male plug for the "twist style" 220 plug on the generator. Then get a male plug for where my electric clothes dryer plugs in. This is the only 220 appliance in my home with a "plug". Between them I am thinking of using 8/2 bare copper ground wire. It would be about 20 feet long. I would then throw the breakers on my hot water heater and my HVAC so the generator will not try to power those. My questions are this. Will this work? If so what do I need to know about the plugs? Which terminals on the generator need to match which terminals on the dryer plug? Is there anything else I need to know? Thanks!

14 Answers
Fr_Chuck's Avatar
Fr_Chuck Posts: 72,627, Reputation: 37036
Expert
 
#2

Dec 12, 2006, 07:08 PM


This process is not legal in the US. To be within code for the US, you have to have a auto switch unit that will stop feedback unto the utilties.
Helpful
labman's Avatar
labman Posts: 10,673, Reputation: 3050
Über Member
 
#3

Dec 12, 2006, 07:12 PM
It will work, people do it. But the big thing you need to know is that it is illegal. Code requires an idiot proof, or at least resistant set up. I have spent a lot of time recently studying the problem. If you have a fairly new Square D box, it can be fairly cheap and easy to do legal, see http://ecatalog.squared.com/fulldeta...number=QOL3125 Scroll down to documentation. The kits are a fairly reasonable $16. Trouble is none of their kits will fit my old GE box.

For more discussion, see http://www.askmehelpdesk.com/electri...use-42426.html
And http://www.askmehelpdesk.com/electri...tch-38571.html

Go back and read those 2 threads. Then come back with specific questions. We will kick things around with others' inputs and maybe come up with safe, legal, reasonable solutions. Tk rusel is the best.
Helpful
john30563's Avatar
john30563 Posts: 8, Reputation: 1
New Member
 
#4

Dec 12, 2006, 07:14 PM
Please read early in my post. At my entrance there is a disconnect. A DISCONNECT. This kills the power either going in, or going out. I plan on throwing this disconnect before powering up the generator. When thrown, this disconnect will not allow backfeed onto the utilities lines. I did not ask about the legality of this. I asked about the process. Thanks!


EDIT:
OK I read the last post. I had to buy a switch when I bought my entrance. It is the main breaker. If I go out and throw it, it kills all power entering the house. I was told this was to protect linemen if someone used a generator. I will check with my local power company to see if I am correct. I just know I had to pay an awful lot for that part of my entrance that I wasn't planning on paying when we built two years ago. Also, by the way, the area I live in does not require inspections, so that portion of the legality is not a problem for me. I don't want to kill no one. But we live in a rural area of the NE GA mountains and last year we were without power for 6 days during an ice storm. The benefits of being on Rural EMC!
Helpful
labman's Avatar
labman Posts: 10,673, Reputation: 3050
Über Member
 
#5

Dec 12, 2006, 08:31 PM
Your disconnect will work if it is double throw. What they want is something that makes it impossible to feed into your panel unless it is disconnected from the utility lines. If you checked my Square D link, it is nothing but a metal plate that bolts into breaker box and slides up and down. Normally it is in the down position blocking a breaker fed by your generator. You can shut off the main breaker, and slide the plate up to block it, and turn on the generator breaker. There are also various sub panels you wire in to feed a double throw switch either from the main panel or the generator. They only give a few circuits and run $300-$400.

You have to realize in the big city, they have to take more precautions to keep the idiots from killing them.

I wouldn't really call where I am big city or rural. I don't know if anybody would ever check my set up unless the lineman came by and my house was lit up and a generator throbbing outside. I am not sure what would happen if I had an illegal set up, and I doubt I want to find out. We don't have any inspection here either, but my power comes from one of the largest power companies in the country, and I am sure they demand a legal system.

If you don't have a double throw disconnect, I would seriously look at the interlock plates. Your 6K generator is only slightly smaller than the 6250 I have. I did some figuring. My furnace, fridge, freezer, and pump if they all ever ran at once would only draw 4kw. They are never going to all be running at once unless I am dumb enough to flip the generator on with them all connected. You can do some serious surviving with your 6K generator if you take a little care.

About 2 years ago we had a bad ice storm here that just destroyed the electrical distribution system in a few counties. Some people didn't get power back on for 2 weeks. Fortunately it stayed above freezing. The typical pattern is to drop to zero after a storm. As bad weather sets in, I am getting more and more serious about this.

I have spent a ton of time trying to find reasonable alternatives. One outfit will make a custom plate to fit my box for $250 plus another $150 for a 240 V inlet. The inlets are readily available for $50. It is tough digging up hard numbers and links. Do a search and you see references to this, that, and the other thing, but no prices or links. And plenty of warnings with no help on doing it right.

Run across any good ideas, please post them here.
Helpful
john30563's Avatar
john30563 Posts: 8, Reputation: 1
New Member
 
#6

Dec 13, 2006, 03:55 PM
On the generator, I talked to a guy at my local electric supply shop today and he told me that what the EMC made me buy to go beside my entrance is essentially a 200 amp breaker. He told me that 'legally' I needed a double throw disconnect at a cost of $330. I asked why the breaker would not protect the workers. He said the breaker does prevent back feeding. He said there was no way to back feed through a open breaker, but that the double pole disconnect was how the utilities forced people to spend more money. I can't understand how the utilities would benefit from me giving an electrical supply house money, but he says the 200 amp breaker would work, even though it isn't exactly legal. He made another comment about "What if the power goes off and your wife forgets to go throw the breaker and back feeds?" Well if that is their thinking, what would keep her from forgetting to go throw the switch they want me to buy? I just can't understand what the difference is between this Main 200 amp breaker and a double pole disconnect? Maybe I am too stupid to understand it.
Helpful
tkrussell's Avatar
tkrussell Posts: 9,673, Reputation: 3698
Senior Electrical & Lighting Expert
 
#7

Dec 13, 2006, 04:16 PM


A manual transfer switch, is what they are referring to, and is a double pole double throw switch. It has two inputs and one output, and switches the output to either one input or the other, and is plain terms, foolproof. There is no way you can send power out onto the grid.

If you do what you propose, then you accept all the risk. The first time someone forgets to shut off the main, and send power out on the grid, there is the potential of killing a lineman.

Fortunately, when they are reassembling a grid after a storm, they treat all the wiring they are working on as it is live, and are constantly checking the lines with testers for voltage.

If they find power coming back at them on lines they know should be dead, they send out a supervisor truck with the tic tracer looking for the source of power, and will isolate it with pole switches, clearing the lines, and continue to look for the source.

Once they find your home is sending out power, they will cut your lines from the grid, and I assure you that your home will be the absolute last one re-connected, after the line super pays you a visit, possibly with the local, county, or state inspector to look over your system. They will, if something is not exactly correct, issue a summons to have the work repaired , to code, before allowing power to be re-connected.

And, if a lineman does get injured, or worse, due to your actions, criminal charges will be pending.

That's why they want people to pay what is needed.
Helpful  (1)
john30563's Avatar
john30563 Posts: 8, Reputation: 1
New Member
 
#8

Dec 13, 2006, 04:26 PM
How often would one be using a generator do you think? I can only think of two times in the last four years we have needed one. So, I know all about code, law, etc. Could someone here just answer my question..............Does that main breaker that the EMC made me buy on the outside of my house next to the entrance stop power from back feeding into the grid, that is my question? I understand their are a lot of STUPID people out there would may well forget to do something as simply as throw a breaker, but I for one am not one of them. I work on all my own stuff, cars, house, etc. I am very self reliant. I am not some scatterbrained geek who would think I can just go crank up the generator and go sit back down in my house. So if there is anyone here who can tell me if that main breaker will cut off the power going back out onto the grid, that would be great.

Oh yeah, by the way, as I stood with linemen last year after being without power for 6 days, they heard a generator and went to the house with me to get it turned off because I knew where the house was. So those guys aren't as stupid either. Thanks!
Helpful
tkrussell's Avatar
tkrussell Posts: 9,673, Reputation: 3698
Senior Electrical & Lighting Expert
 
#9

Dec 13, 2006, 04:28 PM


Yes throwing the main switch to Off will isolate your system from the grid. An open switch means current cannot flow in either direction.
Helpful
john30563's Avatar
john30563 Posts: 8, Reputation: 1
New Member
 
#10

Dec 13, 2006, 04:30 PM
I thought it did, I was just here making sure. Thank you very much.
Helpful

Not your question? Ask your question View similar questions

 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Add your answer here.

Remove Text Formatting

Undo
Redo
 
Decrease Size
Increase Size
Bold
Italic
Underline
Align Left
Align Center
Align Right
Ordered List
Unordered List
Decrease Indent
Increase Indent
Insert Email Link
Wrap [QUOTE] tags around selected text
Wrap [CODE] tags around selected text
Wrap [HTML] tags around selected text
Wrap [PHP] tags around selected text
Wrap [YOUTUBE] tags around selected text
Notification Type:



Check out some similar questions!

Generator Problem [ 17 Answers ]

Hello, My problem is this,I was given a new portable generator by my father-in-law.He bought a new generator from Max tool.com and it turned out to be no good (the one he gave me). I set up his generator to backfeed his service(residential application) in times for when the power goes...

Portable generator [ 2 Answers ]

QUOTE=tkrussell]The 100 volts is a bit low. Electrical device operate on +/- 10% , so the lowest volts supplied should be no lower than 108 volts. Incandescent lamps and electric heat will work fine on 100 volts. But any motors may overheat using 100 volts. Volts is usually changed on the...

Portable generator [ 2 Answers ]

The question I have is that my generator is only putting out about 100v. I would like to know if this will cause damage to anything that is running off the generator. Correct me if I am wrong but don't most appliances run between 110 and 120. I was told that the output of the generator could vary...

How big of a Generator should I get? [ 7 Answers ]

Well Hurrican season is rolling around again and this year, I am considering getting the power generator to add to my supplies. My question is this. How much power do I need to power my refridgerator and a few lights and fans? My new fridge has a 652 kWh/year power rating (from the yellow...


View more Electrical & Lighting questions Search