Where can I find proof?
I know very well that a GFCI does not require a ground to work... but I need to convince an inspector that this is the case. He only sees that it does not trip with his tester... which I know is using the ground to trip it... as opposed to the built in test button that uses the neutral. And I know it is perfectly legal and code compliant to have a GFCI in an old house which does not have aground, in order to meet the 6ft kitchen GFCI code. But the inspector (not electrical inspector... but rental habitability inspector) is asking for proof or statement from an electrician. Is there a section of the NEC that states this is code compliant I can refer him to?