Reading the same line that iwire was reading:
404.1 Scope.
The provisions of this article shall apply to all switches, switching devices, and circuit breakers where used as switches.
Make it pretty clear to me that 404.1 does _not_ apply to all devices which may possibly be used as switches.
In particular, the scope calls out 'circuit breakers were used as switches'. While a circuit breaker is clearly mechanically a switch, 404.1 only applies if the circuit breaker is used in a switching application.
I believe that the same point could be made for a GFCI. If it is used in an application to turn loads on and off, then IMHO it is a switch and 404 applies. If, on the other hand, it is used as a circuit protection device, then IMHO 404 does not apply.
If 404.1 applies to anything that could be used as a switch, then it applies to plugs, receptacles, and screw shell lamp holders, among other 'non-switch' devices.
-Jon
