This flex is sold along other types of NM wire molding, but I can't find anywhere where this product explicitly allows NM or not.
Wiring – run NM wire through this type of flex legally
code-compliancewiring
Related Solutions
Couple problems I see. First is the textured ceiling. You'll never be able to open that up and patch it without being obvious, the texture is something that just isn't done these days. Second, the exterior wall should have insulation in it, so you'll end up fishing the line through insulation and the vapor barrier.
Instead, I'd suggest running the line around the floor if you can get it to a convenient wall anywhere in that room. Use some fasteners to keep the cable at the base of the wall to run it around the room:
This is how I suspect the circuit is wired, but you'll have to investigate to be sure.
In the fixture junction box:
White = Grounded (neutral) conductor.
Black = Ungrounded (hot) conductor.
Red = Switched ungrounded (hot) conductor.
The circuit may be wired this way because it continues on to feed other rooms, or simply because the switch is a "smart" switch that requires a grounded (neutral) conductor.
You'll learn a bit more about the circuit, when you open up the switch box and take a look inside. If you're still not sure what's going on, you'll have to probe the wires to gain a better understanding. If at any point you don't feel comfortable, or you're in over your head. Don't hesitate to contact a local license Electrician.
Related Topic
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Best Answer
According to the 2015-16 UL White Book, this product is only allowed to contain the following:
Which means no NM cable, no lamp cords, no extension cords, nothing but the types of cable listed in the table above.
NOTES:
- I had trouble finding UL marking on this product, so this information could be inaccurate. Check the product/packaging for an official UL mark and listing. Specifically look for the wording "General-use Cable Routing Assembly" and/or "ANSI/UL 2024"