fzbuilder wrote:
Hey Guys, I have a double 20 amp breaker that is connected to each
other. I have one side running the kitchen and one side running the
washing machine in the garage. I was told this is a standard practice,
however, I have a portable hot tub that I use in my garage that I only
use when not using the washing machine. The hot tub is plugged into a
GFCI outlet located about 5 feet down the wall off the washer
receptical that was installed before I moved in.

Here is the big problem, I have just noticed a piece of conduit that
comes off the furnace that was buzzing, getting hot and it stopped
after turning off the hot tub, the other day I was running items from
the kitchen and the conduit got so hot it was burning paint off the
wall. I shut off the double 20 amp breaker and it cooled down. It now
gets hot with that breaker off and running a space heater upstairs
that is on another breaker. I have the breaker off on the furnace and
am stumped to what is going on or how this my be wired. The conduit
going to the furnace goes to a junction box on the wall that has some
sort of relay on the top of it. Any help would be great. Thanks

Perhaps you have a broken ground somewhere, and the route to ground via
the conduit (or wires inside it) is substituting.

While I can't surmise from what you've told us whether that's truly the
case, nor how the system is wired, it sounds dangerous to me. Stuff
shouldn't get hot.