I'm going to borrow your deadman peddle idea.
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I seldom work on tube/valve equipment today, everything is 5 or 12V.
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Which is safer in one way because I'm not constantly poking around in 300V circuits, dangerous in others because I've grown careless and have to really keep thinking "This will knock the pee out of you if you aren't careful" when working with tubes/valves. A GFI isn't of any use on the output of a transformer HV power supply.?
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I have this nice foot peddle I bought with the idea of a stomp to transmit for my ham radio, since I seldom play ham, so it was never used.
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A friend is bringing a Fender tube/valve amp over later this week, and, if I can get my pain meds straightened out so I can sleep, I'll be working on it. A "Keep your foot on this peddle or the power goes away" is a nice safety feather. A full nights sleep is another!
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It is DPDT, so I'll wire the contacts in series down closed, that way a single contact failure welded shut won't defeat the safety and I'll control a nice small STDP 50A contactor, energise to close contacts.
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I wish I knew why electricians insist on calling large relays contactors. One of life's mysteries.
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My wife has her great-grandfather's wooden cane, complete with curved handle like a Shepard's crook. I shared "And you can use it to pull be free if I really mess up." She moved it from her art room to my electronics / radio room hanging it on the wall next to the emergency "kill the AC to the work bench" switch.
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You cannot have too many safety steps.
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