My grounding bus in my subpanel, which is secured to the panel frame, reads 122 VAC to hot phase which is great. I also get 122 VAC from hot phase to neutral bus. Shouldn't I also get 122 VAC +/- from hot phase to the cabinet being that it is bonded to the grounding bus? Instead I get a reading of 1 volt.
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2Make sure you're on to metal and not on paint.– JACKCommented Aug 14, 2022 at 23:49
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1Panels are usually painted well. Paint is an insulator. Did you touch bare(non-painted) metal of the panel?– crip659Commented Aug 14, 2022 at 23:49
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I installed a brand new panel, passed inspection, etc. so no paint, On a lark, ck’d that panel frame was bonded and seems like it’s not.– RogerCommented Aug 15, 2022 at 0:42
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Ah! I see what you mean by painted--not a coat over the new metal. Will recheck on the bare metal. Thanks– RogerCommented Aug 15, 2022 at 16:32
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1 Answer
You're probably trying to read voltages through the paint on the panel. Try taking the reading from a metal connector screwed into a knockout on the panel and to hot. If you don't get a good reading, then your ground bus isn't connected electrically to the panel.
