Here is some additional information. I am upgrading almost all the switches and receptacles to the modern Decora units on the first floor. I don't want to get into doing the second floor, unless absolutely necessary. All the new receptacles are tamper resistant. All the receptacles in the kitchen are on a GFI breaker, but none are tamper resistant. All the outside receptacles are on GFI breakers. Tonight I was working on finishing up the dining room, which has 3 receptacles on each wall times 2, equals 6, plus one more on a third wall, for what I thought was a total of 7. Then my wife told me that the microwave, and the receptacle on the common wall with the dining room, wasn't working. I had turned off the breaker that was marked for the dining room. I did a quick count, and realized that there are 9 receptacles on that one 20 amp breaker. The entire home is wired with 12 gauge wire. The microwave is mounted inside a cabinet, and the plug is not accessible without first removing the microwave. It is highly unlikely that all of these receptacles would be used at once, and we have never had a problem with the breaker tripping. My question is, is there a maximum number of receptacles that are allowed on one circuit? Does the microwave need to be changed out to a GFI receptacle? I am not certain if I can split up these 9 receptacles, since I don't know how they were originally run. I will be checking into this if necessary, by trying to locate the wires in the cellar. If necessary, I can put them all on a GFI breaker if the number of receptacles isn't a problem.
The garage was never on a GFI breaker, and I will make that change this week. I can also change out the bedrooms if this is a safety concern, but do I need to use the arc fault/GFI or can I use just the arc fault breakers for the bedrooms? All the bathrooms have GFI breakers installed from day one. The breaker panel is a Square D QO.