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

[ultiarjan 1,223]

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.

Question;

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) ?

Edited November 1, 2015 by Guest

[ultiarjan 1,223]

ok, just got a brainwave a bit late... I know.... easy to measure..... on the original UM2 powerblock the outerring of the plug is indeed directly connected to the mains ground..

[IRobertI 520]

All I know is that if you don't ground it and rest your forehead against the frame you get a nice little tingle going on I live in an old apartment where the only grounded outlets are in the kitchen so I don't have much choice in the matter.

[ultiarjan 1,223]

ha ha ... the way you say it makes me believe you actually do this a few times day