Mikelite68
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I’m a marine electrician. I was recently working gfci circuits on a vessel that where wired in delta. Gfci is wired with 60v on each leg. When checking the gfci with a tester it showed an open ground and tester would not trip the gfci. There is 120v with meter and test button on gfci itself works properly. Gfci is grounded properly. I’m wondering if the tester is only made to work on y wired system with a hot and nuetral rather than delta with two hots? Thanks for any clarification.