I have tried to explain to my customer why it is not a good ideal to have a 3 phase high leg panel with 120v and 3 phase circuits in it. They are looking for a better explaination on why they need to have an single phase panel with the 3 phase equipment in another panel. Anybody got a good way to explain this? I was always taught it is not a good ideal to have this because you only get 2/3 of usuable panel spaces for 120v. There only is 2 peices of equipment that need the 3 phase so what I did was set 2 disconects for those and put in a single phase panel for all of the 120 stuff.