Hello -- Two questions about grounding a standard 4-foot fluorescent fixture, fed from conduit. The fixture is grounded with a grounding screw and pig tail connected to the circuit ground wire. I expect that the conduit is supposed to be grounded via its physical connection to the fixture. However the fixture is painted, and doesn't make a good electrical connection with the conduit fittings. I can scrape a bit of paint off around the knock-outs to improve the connection. Is that what is usually done?
Also, I note that the fixture is actually composed of five separate pieces of stamped sheet metal, which were painted prior to assembly. They don't actually make good electrical connection with each other. In particular, there's no continuity between the sheet with the grounding screw and the panel with the knock-out where the conduit connects. This seems really odd. If there isn't continuity between the different sheets, I'm not sure how the grounding is supposed to work. Connecting them electrically would probably mean completely disassembling the unit and sanding or scraping off the paint where the different parts connect. Do people actually do this?