I have an outdoor temporary power/meterbase panel that has a 20 amp 240 GFI breaker in it. I am going to replace it with a 60amp single breaker (and a breaker blank for the hole) to run my RV subpanel off of. The subpanel has 30 amp and 20amp gfi breakers in it. Do I need to put a gfi breaker in the main panel since it is an outdoor panel even thou the subpanel has a gfi breaker in it. I am going to use DB cable. I know about the bus isolation for subpanel wiring and groundign the subpanel, but am not sure if I need the gfi breaker at the main panel. Any help would be appreciated. 
