This is for wiring in the United States.
My wife ordered a new GE electric range top, and it came with a 3 wire flex conduit permanently attached. I cannot change it. It has a black wire, a red wire and a ground wire. It looks like this:
We plan to use it in an old cabin that was built in the 1940's. There is an existing 240V 3 prong 50A outlet in the kitchen. Upon opening the outlet, I found a red wire, white wire and black wire in what looks to be 6 gauge? It's very thick, and hard to bend. There is no ground wire present.
My understanding was that I could just wire in the black and red on the range top, and not use the neutral wire in the outlet box. But the fact that there is no ground in the outlet box means I can't ground the range top.
What is the proper way to wire this up without having to run an entirely new outlet from the breaker panel?
UPDATE: Added picture of breaker panel wiring, and it appears the metal box is indeed grounded?
@ThreePhaseEel, yes I plan to hard wire it. I'm away at the moment, but can take a photo later. There is a 3/4 inch metal conduit entering the top of the outlet box. You can see it in the 3rd photo.
Now, I consider myself to be very handy. I do all my own mechanical and electrical work on my cars, I run my own outdoor gas lines, run my own electrical for my landscaping, etc. Add outlets within the house... But I'm obviously not an electrician. It seems like it would be easy enough to replace that sub-panel myself, but in light of all the other panels on that wall, is this looking like something that I should have an electrician handle?
Update 3 My original question has been answered, but it opened another can of worms. And so I've created a new question to address the panel replacement/rewiring: Proper way to modernize 1940's cabin sub-panels
Thank you all so much for your very generous help! It is greatly appreciated.