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As long as one of them is isolated you should be fine. I normally isolate the piece of equipment that I'm working on. I got mine from an RCA distributor many years ago, when they sold VIZ test equipment. I agree they are very hard to find. You could also use a 1 to 1 ratio isolation transformer and then plug your variac into it. It would serve the same purpose, just a little more hassle having to use both pieces of equipment.
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