Smokey,

I was told by Washington state inspectors that "on edge" means the narrow side of the romex is laying against the stud and stapled. The flat side is supposed to lay against the stud (so as not to damage the cable when stapled). I think you're right and the city inspector is misinterpreting Article 336-18-Supports. I would be inlcined to discuss this issue with him. Also, our inspectors will red tag piggy-backing romex in a heartbeat. [Linked Image]