- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
The way I read it seems pretty simple and clear:I agree with the Massachusetts interpretation. But don't find that it says anything more than the NEC does in 406.
The passage doesn't say "when you replace a receptacle, it has to be AFCI protected", rather, it says, go to the rest of the NEC to find out if you have to install AFCI protection when you replace a receptacle.
The "after thought": I mean, if all it said was AFCI must be added, then we'd be installing AFCI protection EVERYWHERE a receptacle is replaced.
They are not saying to go to the NEC to determine whether or not a replacement receptacle must be AFCI protected. They are saying that if that a receptacle/circuit segment in that location would have to be AFCI protected in new construction under the current code, then a replacement receptacle in the same location must also be protected.