Power and noise

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A .25" x 2" X 10" Copper Ground Bar is gross over-kill for domestic hi-fi. That's for telephone buildings with thousands of miles-long copper lines coming in from overhead poles. I've seen it in large networking installations. I've seen it in small optic-coupled 1-switch racks and knew the specifiers were clueless. (They also specified a 20A plug on a 0.5A switch forcing an electrician's bill for no reason.)

I don't think it has any bearing on turntable buzz due to overhead lights. More likely some bit of metal in the TT is not grounded, and a piece of thin #28 wire is all the bond it needs.
 
That's not a big bus bar at all. Maybe the left 1/4 of this one.

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