I'd assume that the OPs reason for even thinking about something as unconventional as running a drop cord room to room is that they're trying to save money and lack the experience to confidently assemble a makeshift drop cord as was previously suggested.
I don't know what permits cost in Calgary, but if CA is anything like NC, the OP would be better off investing the money in another two Cyberpowers, or APCs, if battery backup isn't needed for any rooms. In fact they might even come out cheaper. It'd certainly be lot less trouble (especially if thier building inspection dept is spread as thin as ours) and a better long-term solution as well.
The reality is, people rig stuff like the proposed all the time, in violation of code or not. It's kind of like speeding, except, there's nothing the inspection dept can do, on the extremly slim chance they'd find out about it. I'd be surprised if they even cared. I
I'm not a licensed electrician, though I know and have worked with plenty in the field - residential construction being the family business and all, since 1970 - and I've seen and done my share of wiring. I suspect any legislation related to using power cords in walls to be based on the much more varied (lax) construction standards of such cabling or even the manner in which such cords are most commonly installed - considering such would likely on be used after the fact, and most don't want to replace drywall and repaint the whole room. If they're really that worried about a building code that makes less and less sense every year, with many regulations that have less to do with safety than lining someones pockets, run the cable in conduit.
Having seen lots of wiring hastily installed with breaks and punctures in the jacket still get passed, by inspectors whom are considered overly strict (not experienced enough in the trades they police to reasonably interpret how to apply code) even by fellow inspectors, having dissected many commercial-grade drop cords when repairing cuts or re-terminating damaged ends, and having hand-stripped (for salvage) thousands of feet of electrical wire of varying guages, builds, and ages spanning standards going back 70 years, I'd have no compunction with substituting a quality guage/built power cord in a wall if I really need to, as extremely unlikely as such might be.
That said, I wouldn't recommend taking the route inquired about either.
Chad Varnadore <><ex-armchair quarterback***************Our HT