According to HA HA Budys Here :
Replacing an existing piece of _hardwired_ equipment, and inspectors insisting upon it.
Specific exemption. It's pretty hard to find a two prong receptacle here in any case.
See the electrical wiring FAQ.
According to Chris Lewis :
I should add, as an additional example of where grandfathering does not work is that of GFIs. If an outlet needs to be replaced in a location that now requires GFI, you're required to add GFI. Ie: "shaver outlets" in bathrooms.
You could even replace it with a 2 prong. But the circuit must now be GFI protected.
Ditto.
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