When you install your GCFI outlets, remember that they will generally protect ALL the outlets “downstream” from them on a circuit. So, pick the outlet that’s risky (e.g., by the bathroom sink), then trace that circuit back to the fuse box, and find the outlet on that circuit that’s closest to the fuse box — that’s where you install the GCFI. That way you protect every outlet on the circuit for the cost of only one GCFI.
> When you install your GCFI outlets, remember that they will generally protect ALL the outlets “downstream” from them on a circuit.
I’ll probably install GCFI outlets at the places where I have concern. I rather like the idea of being able to press the Test button at the outlets that are most dangerous, and seeing that everything is working right.
After putting GCFIs at the couple of places I’m concerned about, though, I may take your suggestion and put them at places that will protect the whole house — just in case someone floods the living room, dining room, or bedroom, and then touches a live line (though that person’s luck has probably run out, anyway, and will probably be hit by a bus soon).
I don’t imagine having GCFIs in series would cause a problem. If it’s just a matter of an extra $15 or $30 — I have a small house — I might as well do so.