How low is low current? You'd be surprised how little it takes to stop your heart.
Also, I'm pretty sure for any sustained arc like a Jacob's ladder, you need AC. Be careful with these though, they generate Ozone which IIRC, is even more poisonous than carbon monoxide. Headache and nausea aren't unusual. It has a sweet burning electronics smell. Kind of like brushes on a high powered DC motor.
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