Installed 3/4" wainscoting on wall and used an extension box to bring the outlet forward per code. Outlet is nice and tight, but when I screw the cover on, the middle is tight but the corners of the cover are loose and rock back and forth. Are there special covers I need to use, or do I need to chisel some material away to let the extension box tabs sit further in thus letting the outlet sit further in?

Updated question: I should have just phrased my question this was... 1. Can anything happen to the main electrical service panel if both legs are fed by the same 120v source? 2. If both legs are fed by the same source, as if some one had jumped the legs together because they only one leg was hot (This would juice both legs), what would happen to any 220 appliances that might get connected? For example, a well pump, hvac, dryer, or oven, if anything? ---------------------------- I'm wondering what would happen... I currently have a Interlock with a NEAM 14-50 outlet to power my service panel when I lose power. My "Portable" Generac GP15000E can power everything without a hitch. The problem is, it's really not portable and it's a bear to get it setup and hooked up. Basically I only use it when power goes out for extended periods of time. For short outages, up to a few hours, I've been using a Honda EU2000 with extension cords everywhere.. It's just powering TVs, lights, computer stuff and sometimes a fridge.. But I was thinking. I was thinking I might get a 2nd inverter generator and put them in parallel. This would allow me to use a 120V 30amp RV plug. If I put an adapter on it, it'll split it so I can connect it to my house, but I'm going to end up with 120V, I think it's called in phase, on both legs of my service panel. Does anyone know what might happen if anything at all? Might it kill my 220 appliances like the dryer or HVAC system or will they simply just not run? This is assuming someone forgets to turn off the 220v breakers of course. I'd love to do this because these little inverter generators are so easy to move around and I hate running extension cords around the house. I just don't know what might happen, if anything to the electrical panel or anything connected. Thanks!