thanks for everyone's input...I think as "busbar" suggested, I need to some self studing to better educate myself. I wonder if there is a good and simple to follow book out there...?
thanks again to everyone.
DanDel-
As you've mentioned, I like to know the benefits to mfg. of equipment, end-user of equipment, Utilit company. Also, you mentioned that no Neutral line for Delta, then what about the center tap from Delta to get 120V (line to center)...?
thanks