Grounding cable gauge size

Could someone who has a grounding box take a voltage measurement between one of the ground terminals on their grounding box and the “D” shaped hole in their wall outlet?  I’m curious if a voltage differential exists.  I imagine it will be in the microVolt range if at all.  The D shaped hole in the wall plug should go to the earth ground outside of your home so virtually no risk plus a voltmeter has a high resistance across the leads.  Put the red lead in the D hole and the black lead on the grounding box terminal.  I would expect a positive voltage reading if anything.  

I also added a outlet on the grounding box that grounds dac and server , using a 14 g pure silver wire attached to furutech ncf plugs into the house outlet like Entreq does and it certainly adds a more 3D space.

Interesting. I have always separated the ac grounding from the signal grounding.

ozzy

Agree Ozzy, but with your meter you may be surprised that the  signal grounding is part of the chassis which may also be the AC grounding. Pull your power cable and check the exterior or the RCA connectors to the ground plug and you may find they are the same.

bugremachine,

You are probably right about the rca ground being the same as the chassis ground. But my personal experience has not been good when I mixed the chassis ground and the signal ground. In several cases I got hum.

My solution has been and is now to keep them separate. Perhaps some time, I will check it with an ohm meter.

Question: Are you also referring to the ground on the AC outlet being the same as the signal ground?

ozzy