You don't understand. If you somehow mixed the gas pipe with the electricity, the whole block would explode.
I hope you don't want to become an engineer.
I didn't even listen to his whole story so that is out of the question. I'm simply stating that it is pointless to add a stupid little story to this puzzle. And how slow and precisely he tries to teach it like were all a bunch of Neanderthals. Keeping it as circles and boxes and lines that don't touch simplifies everything just as an engineer would.