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UM2 power questions : do I need to ground the board ?

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For "the machine i'll someday build" I have a few high quality industrial power blocks. As I don't have the right connector I think I'll just wire one up directly and remove the board connector.


Is it ok to only use the +-  or do I also need to ground the board? and if so should I ground the board by connecting the mains ground to the inner metal part of the connector (green circle in the picture) ?GroundPower.thumb.jpg.e08742f03bd4c12c4f81a1838deb53dc.jpg


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