CHach
thats exactly what happened in my house built 1892, downstairs there was 100 amp circuit breaker service and skeins of romex running up to the house, BUT after the $4,000 computer failure it was found the top two floors were powered by K&T, and it gets better, the prior alcoholic homeowner just brought the romex up to the attic for 11 rooms and stripped it and WRAPPPED it around the K&T -- then he place newspaper and two layers of fiberglass insulation over the whole mess. K&T can handle a lot of current; when my electrician found this he cut the wires and he said they flew apart and 11 rooms immediately went dead. There is now 5,000 feet of new romex snaked through this whole house.
I won't tell you what the prior bojack owner did with the gas pipe in the third floor, but I can tell you my plumber came down white as as sheet and AFTER he shut the gas off to the entire house took me up to see it.