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Panel Diagram

Mike Lamb

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What you have there is a 16/20 panel, meaning that there are 16 full size spaces, but the panel is rated for 20 poles, total. On newer panels (at least) the tabs are different and the upper slots would not accept twins...of the same brand. Off brand breakers can often circumvent that. The purpose is to prevent Johnny Homeowner from over-cramming the panel.

But...there's nothing else magical about the upper or lower ends of the bus-bars. As long as the breakers actually fit (and haven't been modified or forced), and he hasn't added more than 4 of them, there's really nothing wrong with it...at the moment.

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