I’m trying to install a new light fixture in Chicagoland. From what I’ve read, junction boxes here do not have a grounding wire and are instead grounded through the junction box. Is there an easy way to confirm this? From what I’ve read it sounds like the threads and locknut in the junction box are telltale signs the box is grounded.
If so, is simply mounting the fixture enough (ie not connecting the light fixture’s grounding wire to anything). This seems to be what the previous fixture was doing. Is there any benefit to adding a grounding screw and tail?