Q. What are the requirements when replacing nongrounding-type receptacles?
A. If an equipment grounding conductor doesn’t exist in the outlet box, the existing nongrounding-type receptacles can be replaced with [406.4(D)(2)](Fig. 1):
a) A nongrounding-type receptacle.
b) A GFCI-type receptacle marked “No Equipment Ground.”
c) A grounding-type receptacle, if GFCI protected and marked “GFCI