I have my own thoughts on this but would like to hear what others think so I will tell my story.
New construction client is worried about location outside of city limits no city inspections. I have been following the construction stages of this home and client wanted a full structural and mechanical inspection before close of escrow and called me to do it. To make a long story short the interior of the home has not been completed to the point of inspection. The plumbing contractor was trenching for the septic system and cut the main electrical feeds to the home. The electrician came and made a temporary splice to allow construction to continue. The plumbing contractor tells the owner that the size of the incoming electrical feeds are not the proper size for the home and they should be replaced anyway. This home has one main 225 amp rated panel being fed with 4-0 copper wire in buried plastic pipe and two additional sub-panels that are fed from the main. According to what I read in the IRC 3-0 is the size for 225 amp main so I basically don’t have a problem with 4-0. My problem is I am afraid the electrican is not going to re-run the main feed and just bury the temp splice. My thinking is the plumbing contractors insurance should pay for the replacement of the complete line I would not want a underground splice on new service. Here are some pics of the splice and all three panels tell me what you think.