I am a Homeowner with some electrical experience. I have run many new circuits in my 1836 home and updated many outlets and switches. I am into a new project to update my attached barn with a 100 Amp service panel. I have the 100 amp panel, it was removed from my home when a 200 amp service was installed by an electrician. My question in how I do this safely. I would like a recomendation on the subpanel feeder double pole cuicuit breaker, what size? Also what size feeder cable to install to power the subpanel. I will need to run about 50 feet of wire to get to the subpanel. Not sure if I should go with a 60 amp subpanel? I thought that I would use the 100 amp panel that I currently have, which has the curcuit breakers already and is in pretty good shape. Any help or information would be most helpful. Thanks.