bringing this back to life, its a good subject.
https://www.youtube.com/watch?v=twhzCgVst80
i really think 406.4(D)(2)(b) should not be allowed as-is. a EGC block-out pin should be supplied so that the 5- becomes a 1- GFCI.
But as said in the other thread, people will just find a way round that and actually end up creating a more dangerous situation- if they dont have a cheater, then they will remove the ground pin (yes you arent allowed to plug in most 5-15ps into non egc gfcis anyway per 250.114, but thats beside the point), and will have eliminated any protection afforded by an egc if the mutilated appliance is ever moved to a non gfci 5-15 receptacle.
What do you mean by a 5 becoming a 1? Just confused here is all.
What Fiona was getting at is that gfcis installed per the 406 exception be only of a 1-15 (AFAIK, no such receptacle exists) variety instead of the standard 5-15 gfci- imo, a terrible idea.
Except for the areas required to have GFCI protection there is little, if any, threat of a ground fault until you bring in an equipment grounding conductor into the circuit. Here in my living room I'm safer from a shock with a two wire circuit than I am with a three if I am using my table saw or hole hawg and I'm even safer with a two wire circuit protected by a GFCI. If you want to be really safe get rid of Equipment Grounds.
EGCs do present their own set of risks- you are surrounded by excellent paths back to the source w/ lots of surface/contact in your avg kitchen- Skin of Fridge,MW, range etc