I am trying to find the best place online to find stranded wire to wire the inside of my control box.
MMy problem is I really don't have anyplace close
You shouldn't use primary wire, its not rated for high voltage. Its meant for automotive use.
Its good for 600V How high a voltage you going to push thru your control panel? Its not SAE wire, that is why I recommended West Marine
http://catalogs.westmarine.com/WebProject.asp?CodeId=7.7.1.4&BookCode=wmm13&pagelabel=423#