Wiring routes out of my garage subpanel through exposed flexible metal conduit (FMC) to metal boxes for just about everything. Garage is detached, and 1990's era. The pool equipment, pool lights, and receptacle circuits all have a dedicated green wire equipment grounding conductor (EGC). The overhead shop lights and garage door circuits don't have such a conductor.
I'm replacing the garage door opener and wondering if I should pull a dedicated EGC wire to the box/receptacle that serves it power. Am I grandfathered in to some 1990's version of the NEC that allowed FMC to be a EGC if the run is greater than six feet? Or was the electrician who did this wrong?
Incidentally the subpanel is feed through a GFCI breaker at the main panel; does this provide code-compliance in the absence of an EGC, if the receptacles on those circuits are labelled appropriately?