If I installed the required 20a circuit in a bathroom,actually I am installing 3 on the vanity countertop,. . .
I guess that you aren't installing three circuits to the vanity, rather three receptacles on one circuit.
My take on 210.11(C)(3)exception, is that one can add additional outlets to the required bath 20 amp circuit serving only one bath. . .as long as the additional outlets are inside that same bath. However, I am not told that ALL the outlets within that bath MUST be added to that 20 amp circuit. Rather, I can pick and choose.
The GFI requirement for receptacles in the bathroom is blanket, gotta have it.
For me, the common sense logic, of the larger capacity circuit serving the vanity and thereby the large hairdryer load, is covered once the receptacle is at the vanity. Additional outlets (lights, fans, WC receptacle) may be added to the 20 amp bath circuit, but are not required to be.
[This message has been edited by ElectricAL (edited 09-27-2003).]