What applications have you used 10 gauge for?
long length to minimize voltage drop. For example I recently did a temp setup to power an air compressor that drew around 15amps at 240v. It was about 140' of cable so I used 10/3.
I havent had to, but I would also use 10/3 for long runs if welding (assuming mig welder running at 120v)
Thanks for posting the image too. 