Another quick 510 ground question

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If i understand correctly the prototype case used the case as the 510 ground through the board. If using a 6061 (non cast) aluminum case, will there be any real benefit in using an external/traditional ground wire at the 510? Or is the board ground through the case sufficient for the capacity of the board?

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If you run all three pads, and make sure that the geometry of the case grounding bosses matches up with the pads on the board, and you avoid corrosion related issues, then there is more than plenty of current carrying capacity in a metal aluminum case. 

You might want to do a (Rohs, trivalent not hexavalent!) chromate conversion on the pads if you were in production. 

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