Is as access floor required to be grounded? In an office building, carpeted tiles. Power under floor in raceway. Non-stringered flooring spec'd (tiles screwed down at each corner) and ground straps at corner.
250.4 (A)(3) and (4) required that normally non-current carrying conductive material enclosing electrical conductors....be connected … ground-fault current path. Or likely to become energized also be grounded (paraphrased).
Is the intent to required access floor be grounded?
To answer, we should first know what you have there. "Access floors" isn't a term that is used in NEC [2017].
Do you mean Article 372? 374? A raised floor in an IT room?