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

well it has been a few years but here in Michigan 18 inch. deep with no traffic, and for a sub panel that has its main breaker in the house the sub panel would not pass inspection if it had its own main. if you are taking power from the main panel you should have to hot, or power red and black, one Nuetral white, and a bare copper and should not have to run an extra ground cable to a grounding rod. but it has been a few years some codes may have changed