![]() Instead we were suggesting leaving the 200 amp main breaker in the panel in place, just not connected to anything, and supplying the panel with a 100 amp double pole breaker that will plug onto the stabs of the panel, and then back feeding the panel thru this breaker. We were not suggesting removing the 200 amp breaker and replacing it with a 100 amp. If someday you build a detached shop or garage, you will have the breaker to supply the feeder to it this way. ![]() Probably the best course is what mrb has suggested and installed the biggest main breaker panel you can (I prefer full forty space 200 amp Siemens panels with copper bus'es) and buy that 100 amp breaker and a hold down kit and supply it thru the 100 amp. It indirectly protects the wires by limiting the load that could be drawn thru them, it will not protect them from short circuits before the panel. The advantage to having a 100 amp main is that it will trip should you overload it and it will prevent you from pulling too much thru the unprotected service wires. If you do not have an outside disconnect now, the wires from the meter to the panel are unprotected, and changing the panel will not make this situation any different. The 200 amp main breaker inside the new panel would only be protecting the panel, it doesn't care what size wire is supplying it (so long as the lugs are rated for that size).
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