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We have a 25 year old home and since it was a foreclosure we had an electrician we knew check it out. I asked about adding a circuit for a welder or plugging in an electric car. He suggested doing neither and calling the power company for a second service.
Same applies if you back feed the circuits for a grid tie solar array. You want to use a low use circuit as it can load it up towards the breaker vs away and you can over load a circuit by back feeding too much power. If its a heavy use circuit you can burn out the wiring before it even gets to the box.
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