I'd say Alex is far more an expert than you are in the field of electricity.Yes, you OBVIOUSLY post images of you bridging electrical terminals as part of your "expertise" in electrical contracting and engineering.
lol, as someone in the field for a "few" years, I'm only laughing at loons like you who don't understand.
Meanwhile someone somewhere is looking at those images and either wondering what the fuck you think you're doing and hoping like hell he never ever meets you; or,
Now it's 24 V DC. First it was 12 V, then 6V...keep going up, sooner or later you will actually find the DC voltage that can kill. Then you'll be right!!is thinking he can just follow along with the things you're doing and go out and arc across the bus bars in his electrical panel or across the terminals of the 24v batteries in his diesel truck. Because YOU SAID IT'S SAFE TO DO IT.