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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Generator "Back Feed" through GFI Outlet
Hi,
I am planning on getting a generator incase of a long term loss of power. So far that has never happened to me, but I want to be prepared. If such an event would occur, I would "open" the main breaker, then use the generator outside in back of my house to "back feed" through an outside GFI outlet. Note: I have no interest in whole house power, but power for the refrigerator and some low power devices. I was planning on replacing the GFI outlet with a "regular" outlet, but a friend told me he once used his generator and "back feed" through a GFI outlet without a problem. Does anyone know if "back feeding" through a GFI outlet is OK? Thank You in advance, John |
#3
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Generator "Back Feed" through GFI Outlet
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#4
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Generator "Back Feed" through GFI Outlet
On Tue, 27 Nov 2012 15:57:37 -0500, wrote:
I was planning on replacing the GFI outlet with a "regular" outlet, but a friend told me he once used his generator and "back feed" through a GFI outlet without a problem. Does anyone know if "back feeding" through a GFI outlet is OK? It is NOT ok, GFI or regular outlet. The technique is often called a "suicide cord" where you have a power cord with a male power plug at both ends. One goes to the generator, the other into a wall outlet. Lots of problems. 1. If you forget to disconnect your house from the mains, you're going to either power the rest of the neighborhood, or electrocute the utility company employee trying to restore the power. 2. Your house is probably wired with two phases from the transformer on the pole. The neutral wire carried the difference between the two phases. If you backfeed one phase, the neutral is carrying the entire load. If you had a two phase generator, and try to backfeed both phases, you will to identify which wall jacks have each phase, and then build an even bigger suicide cord with plugs for both phases. If you do something really dumb, like parallel the phases, you'll overload the capacity of the neutral wire and possible start a fire. 3. Generators are rated by their TOTAL power. Most home generators supply two phases, each with HALF of the total power. If you try to run your house with a generator with only one phase loaded, you're going unbalance the generator and potentially cause a bearing failure. At the least, it's going to sound rather funny. If you try to load the generator to full capacity from one phase, it will likely shut down in protest from overload. 4. Powering the entire house is wasteful and messy. Do you really want to run around the house and turn off or unplug everything that doesn't need power during an emergency? As Phil Hobbs suggested, get a transfer switch with a safety interlock. They come in various flavors and sizes, but all are far better than a suicide cord. If your generator is portable, get a transfer box with an appropriate connector rather than permanently connecting your generator. https://www.google.com/search?tbm=isch&q=transfer+switch -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#5
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Generator "Back Feed" through GFI Outlet
Cydrome Leader wrote in message
... wrote: Hi, I am planning on getting a generator incase of a long term loss of power. So far that has never happened to me, but I want to be prepared. If such an event would occur, I would "open" the main breaker, then use the generator outside in back of my house to "back feed" through an outside GFI outlet. Note: I have no interest in whole house power, but power for the refrigerator and some low power devices. I was planning on replacing the GFI outlet with a "regular" outlet, but a friend told me he once used his generator and "back feed" through a GFI outlet without a problem. Does anyone know if "back feeding" through a GFI outlet is OK? Thank You in advance, John backfeeding into an outlet is never ok. don't do it. just run your fridge off a really good quality extension cord. Assuming the power rating of the generator was just enough power for when the fridge is on, would such a generator be able to start with the fridge compressor load in line and on, when powered up? How much of power headroom required to overcome such an initial load, should the owner not be aware of this , and wait and not power on the fridge when the gen is up and going. |
#6
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Generator "Back Feed" through GFI Outlet
On 11/27/2012 9:14 PM, Jeff Liebermann wrote:
On Tue, 27 Nov 2012 15:57:37 -0500, wrote: I was planning on replacing the GFI outlet with a "regular" outlet, but a friend told me he once used his generator and "back feed" through a GFI outlet without a problem. Does anyone know if "back feeding" through a GFI outlet is OK? It is NOT ok, GFI or regular outlet. The technique is often called a "suicide cord" where you have a power cord with a male power plug at both ends. One goes to the generator, the other into a wall outlet. Lots of problems. I found a good deal on a generator at a garage sale. I found another good deal on a DIY transfer switch at another garage sale. These were both impulse purchases with no opportunity to research. When I got around to setting it up, I discovered that the permit fees exceeded the cost of the hardware. There were other issues where the national electrical code seemed to specifically prohibit things that the inspector said would be ok. And since the electrical service doesn't meet current code, there's risk that messing around in the breaker box might require some other major COSTLY changes. Opinions vary. I don't think the project will ever happen. Extension cord sounds like the right option. |
#7
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Generator "Back Feed" through GFI Outlet
On Wed, 28 Nov 2012 04:13:24 -0800, mike wrote:
I found a good deal on a generator at a garage sale. I found another good deal on a DIY transfer switch at another garage sale. These were both impulse purchases with no opportunity to research. I currently have two small generators, neither of which runs. At one time, there were four generators. I bring home obvious repair jobs in the hope that I would find the time to repair them. Somehow, it never happens. When I got around to setting it up, I discovered that the permit fees exceeded the cost of the hardware. There are two types of transfer boxes. The one that connects on the utility side requires utility company involvement and can be expensive. If your transfer box is designed to work with an autostart type generator and/or you plan to power the entire house, you need this type. The type that installs on the load side of the breaker box, is much easier to deal with, does not require utility company involvement, and is treated by the county as a secondary breaker box. Any competent electrician can do the work. I don't recall the exact permit fees, but I think they were about $150 as of a few years ago. Something like this: https://www.northerntool.com/shop/tools/product_200321033_200321033 http://www.reliancecontrols.com There were other issues where the national electrical code seemed to specifically prohibit things that the inspector said would be ok. Welcome to the real world. One of my friends finished a custom home last year. Inspector 1 would show up and declare everything to be wrong. After changes were made according to Inspector 1's opinions, Inspector 2 would arrive and declare that it's all wrong and should be done yet another way. The process is endless and seems to be designed to keep general contractors and inspectors in business. Reciting NEC code chapter and verse to the inspector does nothing useful. We even have examples of the county breaking state law, and not caring because they know it's too expensive for a homeowner to run it through the courts. http://www.santacruzsentinel.com/localnews/ci_15801577 And since the electrical service doesn't meet current code, there's risk that messing around in the breaker box might require some other major COSTLY changes. Opinions vary. Yeah, that's a problem. As soon as they find anything that's not to current code, they will sometimes make you bring the entire house up to specification. You could be doing a minor electrical modification, but the county will sometimes turn it into a major project. This tends to discourage homeowners from obtaining permits. The major incentive is that the homeowners insurance company will not use non-permitted construction as an excuse to not pay a claim. I don't think the project will ever happen. Extension cord sounds like the right option. Yep. Cheap, easy, and versatile. Incidentally, one of the neighbors nearly had a fire trying to run his freezer, fridge, electronics, and who knows what else, from a series of cheap 16/3 extension cords. Make sure the extension cord can handle the load. Also, make an effort to balance the load between the two phases. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#8
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Generator "Back Feed" through GFI Outlet
On Wed, 28 Nov 2012 08:25:42 -0800, Jeff Liebermann
wrote: https://www.northerntool.com/shop/tools/product_200321033_200321033 http://www.reliancecontrols.com The manual, which shows how it works and how it's wired. http://www.reliancecontrols.com/Documents/ProTran%20Instructions.pdf -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#9
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Generator "Back Feed" through GFI Outlet
On 11/28/2012 10:25 AM, Jeff Liebermann wrote:
There are two types of transfer boxes. The one that connects on the utility side requires utility company involvement and can be expensive. If your transfer box is designed to work with an autostart type generator and/or you plan to power the entire house, you need this type. Probably not for auto-transfer. The generator would have to supply the total connected load. The transfer switch below is more likely to be auto-transfer. It only runs selected loads which a properly sized generator can supply. The type that installs on the load side of the breaker box, is much easier to deal with, does not require utility company involvement, and is treated by the county as a secondary breaker box. Any competent electrician can do the work. I don't recall the exact permit fees, but I think they were about $150 as of a few years ago. Something like this: https://www.northerntool.com/shop/tools/product_200321033_200321033 http://www.reliancecontrols.com A third approach is in Phil's post. You install a breaker in a top position in the service panel and backfeed it from the generator. A mechanical interlock on the door prevents the service disconnect and generator breaker being on at the same time. Phil gave a source for the interlocks. Some panel manufacturers also sell them. I agree with others that a "suicide cord" is a real bad idea. For an easy to disconnect connection a proper method is to use an "inlet" with appropriate ratings: http://www.leviton.com/OA_HTML/Secti...minisite=10251 The cord from the generator to the inlet is a normal extension cord with the appropriate rating and ends. With a transfer switch or interlock, the prongs of the inlet will never be live. |
#10
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Generator "Back Feed" through GFI Outlet
On 11/28/2012 8:52 AM, bud-- wrote:
On 11/28/2012 10:25 AM, Jeff Liebermann wrote: There are two types of transfer boxes. The one that connects on the utility side requires utility company involvement and can be expensive. If your transfer box is designed to work with an autostart type generator and/or you plan to power the entire house, you need this type. Probably not for auto-transfer. The generator would have to supply the total connected load. The transfer switch below is more likely to be auto-transfer. It only runs selected loads which a properly sized generator can supply. The type that installs on the load side of the breaker box, is much easier to deal with, does not require utility company involvement, and is treated by the county as a secondary breaker box. Any competent electrician can do the work. I don't recall the exact permit fees, but I think they were about $150 as of a few years ago. Something like this: https://www.northerntool.com/shop/tools/product_200321033_200321033 http://www.reliancecontrols.com I bought one of those for a buck. And a new 5KW generator for $100. Were those "Can'tPassItUp" deals that I later regretted. I have some really nice cable that can easily handle the generator interconnect, but it doesn't have the proper markings, so wouldn't be strictly code compliant either. An additional $150 for a permit and iffy approvals killed my ambition. A third approach is in Phil's post. You install a breaker in a top position in the service panel and backfeed it from the generator. A mechanical interlock on the door prevents the service disconnect and generator breaker being on at the same time. Phil gave a source for the interlocks. Some panel manufacturers also sell them. I asked about interlocks and was beat bloody in the newsgroups that those were NOT legal under any circumstances. Didn't really matter cuz... My box has 5 primary breakers each supporting a set of secondary breakers. Since there's no single disconnect, I have no way to get from one branch to another using an interlock. Next time we have a substantial power outage, I'll dump the whole lot on Craigslist. I agree with others that a "suicide cord" is a real bad idea. For an easy to disconnect connection a proper method is to use an "inlet" with appropriate ratings: http://www.leviton.com/OA_HTML/Secti...minisite=10251 The cord from the generator to the inlet is a normal extension cord with the appropriate rating and ends. With a transfer switch or interlock, the prongs of the inlet will never be live. |
#11
Posted to sci.electronics.repair
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Generator "Back Feed" through GFI Outlet
N_Cook wrote:
Cydrome Leader wrote in message ... wrote: Hi, I am planning on getting a generator incase of a long term loss of power. So far that has never happened to me, but I want to be prepared. If such an event would occur, I would "open" the main breaker, then use the generator outside in back of my house to "back feed" through an outside GFI outlet. Note: I have no interest in whole house power, but power for the refrigerator and some low power devices. I was planning on replacing the GFI outlet with a "regular" outlet, but a friend told me he once used his generator and "back feed" through a GFI outlet without a problem. Does anyone know if "back feeding" through a GFI outlet is OK? Thank You in advance, John backfeeding into an outlet is never ok. don't do it. just run your fridge off a really good quality extension cord. Assuming the power rating of the generator was just enough power for when the fridge is on, would such a generator be able to start with the fridge compressor load in line and on, when powered up? How much of power headroom required to overcome such an initial load, should the owner not be aware of this , and wait and not power on the fridge when the gen is up and going. the compressor in a fridge isn't too bad. Being able to shut off the defrost cycle coils might help a big during a power outage though. They waste lots of power. |
#12
Posted to sci.electronics.repair
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Generator "Back Feed" through GFI Outlet
Jeff Liebermann wrote:
On Wed, 28 Nov 2012 04:13:24 -0800, mike wrote: I found a good deal on a generator at a garage sale. I found another good deal on a DIY transfer switch at another garage sale. These were both impulse purchases with no opportunity to research. I currently have two small generators, neither of which runs. At one time, there were four generators. I bring home obvious repair jobs in the hope that I would find the time to repair them. Somehow, it never happens. When I got around to setting it up, I discovered that the permit fees exceeded the cost of the hardware. There are two types of transfer boxes. The one that connects on the utility side requires utility company involvement and can be expensive. If your transfer box is designed to work with an autostart type generator and/or you plan to power the entire house, you need this type. The type that installs on the load side of the breaker box, is much easier to deal with, does not require utility company involvement, and is treated by the county as a secondary breaker box. Any competent electrician can do the work. I don't recall the exact permit fees, but I think they were about $150 as of a few years ago. Something like this: https://www.northerntool.com/shop/tools/product_200321033_200321033 http://www.reliancecontrols.com There were other issues where the national electrical code seemed to specifically prohibit things that the inspector said would be ok. Welcome to the real world. One of my friends finished a custom home last year. Inspector 1 would show up and declare everything to be wrong. After changes were made according to Inspector 1's opinions, Inspector 2 would arrive and declare that it's all wrong and should be done yet another way. The process is endless and seems to be designed to keep general contractors and inspectors in business. Reciting NEC code chapter and verse to the inspector does nothing useful. We even have examples of the county breaking state law, and not caring because they know it's too expensive for a homeowner to run it through the courts. http://www.santacruzsentinel.com/localnews/ci_15801577 And since the electrical service doesn't meet current code, there's risk that messing around in the breaker box might require some other major COSTLY changes. Opinions vary. Yeah, that's a problem. As soon as they find anything that's not to current code, they will sometimes make you bring the entire house up to specification. You could be doing a minor electrical modification, but the county will sometimes turn it into a major project. This tends to discourage homeowners from obtaining permits. The major incentive is that the homeowners insurance company will not use non-permitted construction as an excuse to not pay a claim. I don't think the project will ever happen. Extension cord sounds like the right option. Yep. Cheap, easy, and versatile. Incidentally, one of the neighbors nearly had a fire trying to run his freezer, fridge, electronics, and who knows what else, from a series of cheap 16/3 extension cords. Make sure the extension cord can handle the load. Also, make an effort to balance the load between the sadly the only way to get a good extension cords these days is to make your own. goto the hardware store or electric supply and get some good rubber cord and some real plugs and make a receptable box. I'm terrified by the **** they sell as extension cords these days. The contact are always utter crap, the crips are usually corroded by the cheap plastic and they are going to burn up at more than a 3 amp load. If you're a contractor doing work an a cord burns up running a chop saw, no big deal. If you're asleep at home, that's different story. |
#13
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Generator "Back Feed" through GFI Outlet
mike wrote:
I found a good deal on a generator at a garage sale. I found another good deal on a DIY transfer switch at another garage sale. These were both impulse purchases with no opportunity to research. Extension cord sounds like the right option. When the Y2K mania was in full swing, my wife let me buy a small generator. We had a really messy ice storm some years ago, and I knew power was going out when I could hear major branches falling at one second intervals. When the juice went off, I went to the basement and rewired our furnace to a power plug, brought in the extension cords and went to bed, About 6 AM, my wife woke me and said it was freezing. So, I started the generator next to our garage, plugged the extension cord in, and powered our fridge, freezer and furnace, and charged some batteries. Even before the generator ran out of gas, it was warm in the house, and the fridges were cycling normally, so I shut it down. I was just about to do it again when the power came back on. (There is an advantage being close to the substation with no HV fuses between, you get your distribution line up first.) Jon |
#14
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Generator "Back Feed" through GFI Outlet
Government asshole bull**** ends at the outlet. It is not that hard to setup a system that does not touch the electrical wiring in the house and just use cords. The transfer switch is built into an electric cord basically, they have absolutely no jurisdiction.
I could do it, I could show you how to do it and I can do it reasonable in cost. Not one single permit required. You don't even have to take an outlet cover off. Get a couple 24V relays and a transformer, a roll of 12-3 WG UF Romex (has to be UF) and a few other things and you can tell the inspectors to go **** off. However you WILL have to completely understand how the thing works and all the safeties involved and never defeat them, otherwise your house insurance might refuse to pay in the event of an ,,,,, event. One of the most important things is that the device(s) must not cause a fire or any other problem like that. This is VERY important. The insurance can say whatever they want, but no matter what you do, I mean you could have a ****ing meth lab in there, and if it does not CAUSE the loss it is not grounds for denial of claim in any jurisdiction of which I am aware. Just like if you are drinkiing or don't have a license, they will tell you that any accident is your fault because you should not have been there even if you get reareanded at a red light. That is another thing "they" tell you that is simply a ****ing lie. Some are told that if you don't have car insurance you cannot collect if you get rearended. That is also bullmother****ing****. Maybe it is different in othr countries, but in the US that is the way it is no matter what the lawyers say, even the ones in government. The COURTS say, and that is a bit different crowd. And the cops are not lawyers eityher, so do not forget that. Remember what YOU know if you get busted for something, not what they tell you. Enough on that. This is not tht hard to do. With a bunch of extension cords going to a couple of boxes I can do this in a prefaectly acceptable fashion. I can make it comply with all major UL requirements. Not a big problem at all. J |
#15
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Generator "Back Feed" through GFI Outlet
On 11/28/2012 11:24 AM, mike wrote:
On 11/28/2012 8:52 AM, bud-- wrote: A third approach is in Phil's post. You install a breaker in a top position in the service panel and backfeed it from the generator. A mechanical interlock on the door prevents the service disconnect and generator breaker being on at the same time. Phil gave a source for the interlocks. Some panel manufacturers also sell them. I asked about interlocks and was beat bloody in the newsgroups that those were NOT legal under any circumstances. I have no idea what "the newsgroups" are. I have only looked at SquareD and Siemens. Both have panel cover interlocks. They are code compliant. Likely Phil's link is also allowed. |
#16
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Generator "Back Feed" through GFI Outlet
On Thu, 29 Nov 2012 10:12:45 -0600 bud-- wrote in
Message id: om: On 11/28/2012 11:24 AM, mike wrote: On 11/28/2012 8:52 AM, bud-- wrote: A third approach is in Phil's post. You install a breaker in a top position in the service panel and backfeed it from the generator. A mechanical interlock on the door prevents the service disconnect and generator breaker being on at the same time. Phil gave a source for the interlocks. Some panel manufacturers also sell them. I asked about interlocks and was beat bloody in the newsgroups that those were NOT legal under any circumstances. I have no idea what "the newsgroups" are. ObMadge: You're soaking in it. |
#17
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Generator "Back Feed" through GFI Outlet
On Nov 29, 11:31*am, JW wrote:
On Thu, 29 Nov 2012 10:12:45 -0600 bud-- wrote in Message id: om: On 11/28/2012 11:24 AM, mike wrote: On 11/28/2012 8:52 AM, bud-- wrote: A third approach is in Phil's post. You install a breaker in a top position in the service panel and backfeed it from the generator. A mechanical interlock on the door prevents the service disconnect and generator breaker being on at the same time. Phil gave a source for the interlocks. Some panel manufacturers also sell them. I asked about interlocks and was beat bloody in the newsgroups that those were NOT legal under any circumstances. I have no idea what "the newsgroups" are. ObMadge: You're soaking in it. I was recently talking with a utility lineman who brought a TV in here for repair. We were discussing this very thing. I told him that I wouldn't want his job for any salary. He told me that back feeders who are not smart enough to kill the main are a constant problem. There was a case here a few years ago where a lineman was critically injured from a back fed secondary. I'm also told that if an electrocution should take place the AG might seek a manslaughter conviction. So "how" I asked do these poor guys protect themselves against these bozos? There are apparently a number of ways this is done. First, with utility power off on the primaries the guys ground the line, (phase) on each side of where they're working. This does two things. first it protects them against 240v induced into a pole pig's secondary and second, as long as Mr. Bozo's generator connects to house neutral at some point, which it would if he's using a suicide cord etc, it should trip out the breakers on the generator or smoke it. They also have inductive poles they can hold near a line that will light up and sing in the presence of primary voltage. I still wouldn't want the job. Lenny |
#18
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Generator "Back Feed" through GFI Outlet
On Thu, 29 Nov 2012 10:12:45 -0600, bud-- wrote:
On 11/28/2012 11:24 AM, mike wrote: I asked about interlocks and was beat bloody in the newsgroups that those were NOT legal under any circumstances. I have no idea what "the newsgroups" are. I had to check your newsgroup posting headers to double check that you weren't just another Google Grooper... |
#19
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Generator "Back Feed" through GFI Outlet
klem kedidelhopper wrote in message
... On Nov 29, 11:31 am, JW wrote: On Thu, 29 Nov 2012 10:12:45 -0600 bud-- wrote in Message id: om: On 11/28/2012 11:24 AM, mike wrote: On 11/28/2012 8:52 AM, bud-- wrote: A third approach is in Phil's post. You install a breaker in a top position in the service panel and backfeed it from the generator. A mechanical interlock on the door prevents the service disconnect and generator breaker being on at the same time. Phil gave a source for the interlocks. Some panel manufacturers also sell them. I asked about interlocks and was beat bloody in the newsgroups that those were NOT legal under any circumstances. I have no idea what "the newsgroups" are. ObMadge: You're soaking in it. I was recently talking with a utility lineman who brought a TV in here for repair. We were discussing this very thing. I told him that I wouldn't want his job for any salary. He told me that back feeders who are not smart enough to kill the main are a constant problem. There was a case here a few years ago where a lineman was critically injured from a back fed secondary. I'm also told that if an electrocution should take place the AG might seek a manslaughter conviction. So "how" I asked do these poor guys protect themselves against these bozos? There are apparently a number of ways this is done. First, with utility power off on the primaries the guys ground the line, (phase) on each side of where they're working. This does two things. first it protects them against 240v induced into a pole pig's secondary and second, as long as Mr. Bozo's generator connects to house neutral at some point, which it would if he's using a suicide cord etc, it should trip out the breakers on the generator or smoke it. They also have inductive poles they can hold near a line that will light up and sing in the presence of primary voltage. I still wouldn't want the job. Lenny ++++ I don't know about electricity supply but this is what they do on UK railways. At least like in our area with the third rail at ground level. When the ground crews have possession of a piece of track a shorting bar is clamped between the rails at either end of the possession. These bars are then tested regularly at Southampton University , that they will carry 5,000 amps or whatever the rated figure is. |
#20
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Generator "Back Feed" through GFI Outlet
On 11/30/2012 3:32 PM, Allodoxaphobia wrote:
On Thu, 29 Nov 2012 10:12:45 -0600, bud-- wrote: On 11/28/2012 11:24 AM, mike wrote: I asked about interlocks and was beat bloody in the newsgroups that those were NOT legal under any circumstances. I have no idea what "the newsgroups" are. I had to check your newsgroup posting headers to double check that you weren't just another Google Grooper... Better would have been "no idea which of the newsgroups you are referring to". Panel cover interlocks have come up at least a couple times since Sandy on alt.home.repair and many times before that. I have watched this newsgroup for years - one of the more interesting (for my interests). |
#21
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Generator "Back Feed" through GFI Outlet
bud-- wrote: On 11/30/2012 3:32 PM, Allodoxaphobia wrote: On Thu, 29 Nov 2012 10:12:45 -0600, bud-- wrote: On 11/28/2012 11:24 AM, mike wrote: I asked about interlocks and was beat bloody in the newsgroups that those were NOT legal under any circumstances. I have no idea what "the newsgroups" are. I had to check your newsgroup posting headers to double check that you weren't just another Google Grooper... Better would have been "no idea which of the newsgroups you are referring to". Panel cover interlocks have come up at least a couple times since Sandy on alt.home.repair and many times before that. I have watched this newsgroup for years - one of the more interesting (for my interests). He trolled some of the other electronics newsgroups with this crap a while back, and got the same replies. |
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