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Mains Isolation Transformer

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james_s:

--- Quote from: Ian.M on May 18, 2022, 01:39:44 pm ---Since the O.P. is in the USA, that isn't really an issue.   A 55-0-55 Reduced low voltage site supply transformer's total output voltage is near enough the same as one side of their nominal 120-0-120 domestic supply, and if they can't find one with 120V input, they can run an imported 230V input one from a 240V circuit.  However, its seldom worth importing used transformers as the high weight makes shipping prohibitively expensive.

Also, as noted by Terry, the center tap of the 55-0-55 is grounded, to meet applicable regulations for site supplies, and as site transformers are commonly potted, you cant really tell if it can be converted to a (floating) isolation transformer  until you have it on your bench with the lid off.

--- End quote ---

Site transformers aren't a thing here, so it would have to be imported and that's going to cost a lot more than buying a proper benchtop isolation transformer even if you get it for free and just pay the shipping. Power tools here run on 120V directly out of the wall, building sites use GFCI protection with no isolation.

Ian.M:
I suspected that was the case.

Terry Bites:
You can get 110 to 55-0-55 site transformers- though not in the uk.

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