yes dosnt pay to cut corners and not use the wire size you should use . My machine shop is wired in number 6 wire when setting up my machine shop ended up using about 3 x 500 ft rolls of number 6 , most my machine are 3 phase so you end up with a extra wire to run . plus all the emt conduite and breakers and sub boxs. I think with everthing doing it with my dad was like 1500.00 . but know i am up to code and not over stressing the wiring.