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Old 07-11-2019, 2:29am   #8
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Originally Posted by ZipZap View Post
I think the biggest difference is that a normal GFCI will not work very well below the rated voltage, so being on the output might be problematic.

I would think a decent isolation transformer would get rid of the fluctuations driven by the load in the VAT draw. So 1/1 isolation transformer on the line, and then the VAT plugged into that.

If everything is grounded properly the GFCI should still serve as protection, even if the problem occurs in the ultimate load, as the imbalance will show up back at the outlet.
Originally Posted by ZipZap View Post
I would agree that a VAT powering a stable load should be fine, but if the load is changing, the single coil characteristic of the VAT will definitely cause imbalances on the input power that could trip the GFCI.
Thank you, it sounds like it may be fine but it may be time to set up a test location by changing to a GFCI breaker and seeing if it is stable or trips
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