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So heres a seperate question. I couldnt find black and red solid core wiring.
About stranded and solid core wire ... this applies more to the work I do than any particular standards.
Solid wire - better over-all conductor. Stiffer so it's harder to work with but if it's used in an application with moving parts, it will eventually break. On a drop type line like hooking your lights to a remote driver you would want that extra flexibility. Stranded is a better choice due to that added flexibility as long as your wire size fits the amp/volt specifications.
Example: Extension cords you buy use stranded wire.
on your stranded wire that you marked with a marker, you can also label them +/- or red/black using wire labels or electrical tape .... if you're concerned that the marker ink wearing off. Remember, color schematics are so you can easily identify the circuit so you know what is doing what ....