No, its NOT a stupid question, its indeed a GOOD WELL THOUGHT OUT QUESTION. Some panels are classified suitable for Service Entrance while others are NOT. This has to do in part with them having only one or two seperate busses and if its to be a sub panel in the same building IT CANT HAVE BUT ONE IT NEEDS TWO BUSSES THAT CAN BE SEPARATED. On service entrance dual buss panels, however, theres a bonding strip that can be used if its service entrance but the same would NOT be used if its a sub panel.
First of all, most of what I was talking about above refers to one building, outbuildings are treated somewhat different. Under prior NEC it was permissible to ONLY run 3 wires to an outbuilding, 2 hots and a Neutral IFFFFF theres no like phone lines or shared metal water pipe etc etc. BUT if there any shared conductive path like phone or water lines 4 wires were required and the N and G had to remain seperate and isolated just like any other sub panel in the same building. I believe in the new NEC 4 wires are ALWAYS required now i.e. those 3 wires to outbuildigns are no longer permissible.
Nowwwwwwwww before anyone jumps my stuff, hey 3 wires to outbuildings will work and its been done for years, Im just telling you that was when there wasnt and conductive path like phone or water lines between the buildings and Im just tellin what the NEC says and THEY ARE NOTTTTTT STUPID those rules can save your life or prevent a fire, do as yall wish, its your farm and life.
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