Thanks for the info. I guess one cannot round up. Not a problem. Like I said its been a while since I did this sort of thing.
To Cpal: thank you for your advice, its been a while since I had to do this sort of thing and I will round down.
To Bjarney: I fully intend to cut the cord cap off and hard wire this thing. Reason number one is that a twistlock recept is not cheap. About the same as a real disco.
Reason number two is that there is no way I would allow a cord cap to be a disco for a 3 hp motor.
