Reusing cable for diy?

Stuff? well if you expect 'audiophile' quality powercords out of it. Since stuff Like "acrolink' power cable sells for $170. per meter for the raw wire, and the connectors to go with it are in the hundred buck range, or neotech NEP1001 at $1000. per meter for the bare wire.. i think your reuse of an old wire is not in the same catagory as the 'audiophile' one.
Then you can buy decent complete powercords in the under $100. range which are good, but the audiophile snob may stick up his/her nose at them too

If YOU feel comfortable using the wire, then use it.
I bought some MilSpec Teflon insulated 12 gauge wire off eBay and use it for stuff. It is not 'Audiophile Approved', But i can live with my choices.

Fair enough. If it amuses me to work with it, then I will. I won't go into it with any illusions or misplaced excitement.

ST—Hard service cord with all thermoplastic construction, 600V. (PVC)

Should work great for a power cable (as is).
Or strip the ground out, twist a pair in a tube and use a 12-10ga ground (Counter rotated VH style would be great).
You should be really pleased with the performance.

Do it- Give it a try- It'll work. I was really happy with many DIY cables/cords projects.

But in the future, as you'll move up in gear and/or try out diff "audiophile cords" you'll then realize this DIY cord was just really doing what it was best: powering up machinery.

All copper is not created equal, and it probably has some oxidation. In my opinion, that project, as an audio power cord, would be a complete waste of time.