I'd guess the red and black go to the permanent panel inside the house; when the temp is no longer needed, this panel will be removed and the red and black lines will be pulled into the meter can. They are taped up so they won't accidentally touch anything. The GFCI is connected to the lone 20A breaker and to the ground bar (with both ground and neutral in the same hole). The 12ga back to the meter is the main fuse; the 200A breaker is just the disconnect :-)
