Flat 12AWG Wire Legal?

[G33K]

For various reasons I am looking into using flat 12AWG wire to drive the two motors for our shooting mechanism. I have found no rules thus far that prohibit the use of flat wire, as long as they are the appropriate gauge for the application [R44]. Additionally, the lack of color coding on the flat wire is not an issue as pointed out in [R45] because the output from the Jaguar is not necessarily constant polarity (granted we'd still mark the wires for reference).

Here's the wire I'm looking at: http://cableorganizer.com/flatwire/audio-cable.html (P/N FTW-55921201)

Is there anything I've missed that prohibits the use of flat wire? Thanks