NO. I'm hoping that if you undertake to back feed your houses wiring that if anyone is killed it is you. I never said you should be killed for asking questions.
As for providing you with the applicable facts in an internet posting it simply cannot be done. I have been installing and servicing power systems for most of my adult life. It would take a book to provide you with all of the sneak current paths I have encountered over those years.
I thought it was pretty glib of you to say that only stupid people would forget to open the main breaker. Fatigued, drug or alcohol impaired, or over stressed people who are not stupid can and have made that mistake. Not all panels have a single main breaker. Some have four or six and one of those mains would be the dryer outlet while another would be the stove outlet and so forth. In order to get power into those homes you would have to close one or more of the main breakers each of which is connected to the service entry conductors from the service drop or lateral and thus to the transformer. Federal Pacific two pole breakers, of an extensive number of production runs, will fail closed after a very limited number of manual or automatic operations. I have seen other brands fail closed as well usually from internal corrosion secondary to water following the service conductors to the main breaker from the service entry cable.
I am a firefighter and I have responded to a child shocked by a suicide cord as well as to a tree worker electrocuted by a generator back feed.
The injured child was shocked after a playmate found a double male cord hanging in the garage and plugged it in. When the child touched the exposed pin on the other end he received a shock that fortunately did no permanent harm. He was treated for a small The cord had been made up by the landlord to bridge out an open circuit in order to avoid the cost of an electrician on a service call. The circuit continuity had failed at a push in terminal receptacle. After the tenant had demanded the repair of the circuit through the city housing office the landlord had stored the cord for future use.
The back feed death occurred during the 1988 micro burst clean up in the Maryland suburbs of Washington, DC. A tree trimming crew was clearing limbs and trees off of power lines so that they could be rebuilt. The power was out over a very large area and some of the sub stations had been taken off line and grounded out to facilitate the tree work. When my engine arrived on scene we were met by the owner of that family owned, two truck, tree trimming company begging us to get his son down. He had come in contact with a 13.9 kilovolt line that was energized through a neighborhood transformer from the only service drop that was still intact. That drop was to a home were the back feed was coming from. Another fire fighter used one of our fiberglass pike poles as a hot stick to open the fuse above the transformer while I pulled the homes meter. We then brought the tree worker down and attempted CPR and applied an automated external defibrulator. The tree worker did not recover and was pronounced dead after nearly an hour of resuscitative effort at the hospital emergency department less than five minutes from the scene.
Several utility workers have been killed by back feeds from generators. A search of the FACE reports on the OSHA web sight will bring up several examples. In one case, in Georgia, the line had been grounded out but the lineman had failed to notice that the grounding wire on the pole had been broken by a motor vehicle. Since that incident occurred during the clean up after hurricane Hugo the Multi Grounded Neutral (MGM) that should have provided a perfectly safe ground had been broken into short segments by falling limbs. With the only grounding electrode conductor that was still attached to that segment of the MGM damaged near the base of the pole the protection of the grounding was lost.
I'm a sore looser when it comes to the death of young healthy people who are killed by the negligent actions of others.
-- Tom H