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If you do not have your main panel "close" to the meter (close can vary somewhat with the inspector but 6 feet is an often used number) you will need a disconnect at the meter which will become the "main" disconnect. From that point, you will need to run 4 wire (separate neutral and ground) to your distribution panel. Because of the distance, you breaker box becomes a "sub panel" Sub panels can not have the neutral and ground tied together in any way (no bonding screw on the busses). They have to be separate all the way back to the main panel. National Electrical Code is pretty specific but a lot of people get confused and are suprised when they flunk the inspection.
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