[I am sure it was the previous homeowner that did this because there were multiple things he did that were absolutely wrong when it came to repairs around the house.]
My parents old house, built in the 90s, had 5 sinks. None of the handles turn the same. Some rotate inward for on, some outward. Some both clockwise, some both counter-clockwise. Bugged the crap out of me when I visited. When my house was built, the way the key went into the lock was not consistent. Even between the dead bolt and latch knob. One would take the key flat side up, the other flat down. One key went in sideways. I had to go back and turn them all the same way. Sometimes contractors aren’t worth their pay rate.
I was working on the stove top to replace a burner on a glass top electric stove. It is separate from dual wall oven.
So, I went down in the basement and flipped the breaker labeled range. The wall oven went dead. Range still worked. No biggie, just labeled wrong in the box.
So, I actually decided to just discount the wires in the junction box attached to the joist in the basement.
What I found in the junction box was BURN'T WIRES. Where the copper wires that came from the stove connected to the ALUMINUM 10 gauge wires going to the breaker box.
The problem is that you can NOT just twist copper Romex wire together with Aluminum wires. Over time it will cause corrosion. Which will eventually lead to sparking and FIRE.
They make special connectors that you are supposed to use when connecting Aluminum to Copper. Whoever hooked up the electric range top did not use them. So, I assume the previous owner did it because ANY electrician knows this. THIS IS THE REASON WHY THESE TYPE OF CONNECTIONS NEED TO BE MADE IN A STEEL JUNCTION BOX. That junction box kept my house from burning down.
I discovered this the week prior to Christmas 2023. I have lived there for almost 13 years.