Electricians on FABO - I want to add a 60Amp sub panel

As a licensed general contractor in Az, I would suggest you look into the local building and electrical codes..In the county where I am they require 48" for entrance service burial and 36" for secondary service all in 3"conduit. Also you have to consider the distance you will be running to the sub panel to determin the proper wire size...I'd consider getting a couple bids from licensed electricians so you get a better idea of what you need to prevent problems.