Pierre C Belarge said:
Wall space is wall space.
And chimney space is chimney space, and never the twain shall meet.
Pierre C Belarge said:
The chimney wall space is no different that any other wall space. . . . If the chimney was to be sheetrocked, no one may even know it was a chimney.
It would be the sheetrock that turned the chimney space into a wall space. That may seem a bit glib. But look at it from the perspective of the homeowner.
If all you see from one end of the room to the other is sheetrock, you are going to call the whole thing a wall. You are going to hang pictures on the wall, and you are going to look for receptacles on the wall so you can plug in your lamps or your vacuum cleaner. But if you see sheetrock, then brick, then sheetrock, you are not going to hang pictures on the brick, and you are not going to look for a receptacle on the brick. The entire thing might comprise your "north side wall" of the room, but you will decorate and generally treat the two sheetrock areas as though they were separate wall spaces.
Why should the NEC treat them as one long wall?
Pierre C Belarge said:
Fire places have openings that are used for a portion of time during the year.
During those same times, the chimney is also being used. That tells us nothing.
When 210.52(A)(2)(1) uses the phrase "or similar openings," I do not look for holes in the wall. I don't look for a hole I can walk through (i.e., a doorway) or a hole through which I can pass another log for the fire. I look for something that isn't a wall, something you could remove and leave the wall in place, something that would look like a hole during the rough-in stage of construction, if the wall was build first, and the other thing (like the chimney) was built into the hole in the wall.
I simply see a chimney as being a "similar opening," as far as the wall is concerned. So I would place receptacles on the wall to the left of the chimney, and I would place receptacles on the wall to the right of the chimney. In this specific case, the receptacles would be for countertop spaces, not wall spaces, but they would still be left and right of the chimney.