Pauluk: Specifically yes to your question. If you break apart a residential grade recep.,either 15 or 20 A, you will find the same stampings, they just use a different piece of plastic on the face. And also, the Leviton 5320, pretty much the standard device around here, costs me 39 or 40 cents, the guts are exactly the same as a Decora receptacle, which sells for $ 1.68...
If you open a commercial device, say a hubbell CR15, it has the same innards as a CR 20, just different plastic on the front. Go Figure

On the issue of GFI receps, there seems to be some kind of current sensing built into some that won't allow you to draw more than 15 A from the recep.,I have not done much of a scientifical double blinded by the light test, but several times I have tried to pull more than the 15A load and the unit tripped...

[This message has been edited by Almost Fried (edited 11-19-2006).]