The oven-as-Faraday-cage urban legend has been around a long time. It *might* work, but having been in the repair biz and having worked on a ton of lightning damaged boats, I would NOT COUNT ON IT. The damage can be incredibly variable and random. I had lightning blow my VHF antenna off and not damage the radio and I have seen boats sunk by lightning. In theory a closed metal box will conduct all charges around the outer skin and nothing inside will be damaged. It does not need to be grounded. Airplanes are like this - I have been hit while flying and it did no permanent damage. All the power went offline, but we got it back on with the time honored tradition of resetting the switches a couple of times ;)
Do make sure a heavy cable connects the base of the mast to a keelbolt. That helps as much as anything. Joe Della Barba Coquina C&C 35 MK I
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