On Tue, 04 Sep 2007 22:45:47 +0000, Larry wrote:

It's really stupid marinas put megadock power systems on 35' finger piers
that need 20A of 115/230VAC for sailboats.

Most docks in the north east have outlets for both 30 amp cables (120
volt) or 50 amp (240 volts split). Smaller boats without shore power
connectors usually carry an adapter which converts a 30 amp twist lock
plug into a conventional 15 amp socket. You could do the same thing
with a 50 amp plug just using one leg of the 240.