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need more breaker spaces

  1. Electrical
    I am trying to replace a Square D 200A main breaker panel that is in my new home (30 space) with one that has 40 spaces. I see that some are listed as 30/40 (30 spaces/40 circuits) and some are listed as 40/40 (40 spaces/40 circuits). What does this mean. My current situation is this: Builder...