Any code problem putting single phase 240 and three phase 240 in same outlet box

I am running both single phase 240 and three phase 240 in my shop. I discovered that each of the locking, industrial round plugs for these (L14-30R and L15-30R) can fit in one double gang box. Is there any code problem with doubling them up? The single phase 240 comes from the breaker, and the three phase 240 comes from a three phase converter fed from the same panel.