Replacing two switches on one plate, each wired to a different breaker.
How old is the house, and before you bought the home, how detailed was the home inspector, in the aspect of electrical, mechanicals (hvac), and plumbing? Did they note the age of the electrical system in the home, and possible problems. All of this would have been in the documents they would have provided you before you signed off on the sale.
Post pictures of the breaker or fuse panel (make sure that the picture is sized, so it shows the whole panel, same for the junction box), and the junction box in question. What you may have, is a bunch of MWBC (multi wire branch circuits), that means they would share a neutral and ground, but you would have two hots coming in.
As for blowing fuses or tripping breakers, it depends on how much load is on a circuit, not how many circuits are in the home. If you are tripping the main breaker, then yes there would be a problem, that the system is outdated and can not handle modern conveniences.
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Last edited by gregzoll; 10-10-2011 at 11:29 PM.
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