Good topic...

Now that we've decided (maybe) what a structure is, I just have to ask: What, exactly, does "separate" mean?

Example: You build a brick barbecue one foot from away the house. Is it a structure? Is it "separate"? If you mount a weatherproof receptacle on it for your rotisserie, does NEC require a disconnect?

Another example: If the gazebo is attached to the house with an overhead shade lattice, is the gazebo still a separate structure, or is it part of the house? Why?

Taken-to-Absurdity example: How about a single 2x4 stretching from the house to the gazebo for "shade"? Are they still separate structures?

Somehow, I don't think Article 100 is going to help here.