Keep in mind, “separate” ground at the panel, even a separate panel not bonded to the main breaker box STILL goes into the SAME ground (earth) as the other ground rod(s).
Please explain in more detail what you mean.
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entire book(let)s have been written about the subject of grounding. Most of what I know is from setting up ham radio equipment at home, installing towers here and it’s a topic dweebs, geeks and “auty”/“aspy” folk will argue to death - or blocking - on the internet.
Basically:
I’ve read SO many posts here and on other audio forums about people spending beaucoup dollars installing a “dedicated”, “isolated” 20A power source for their audio equipment AND mentioning “with a separate ground.”
Typically, there is only ONE service entrance for power per home. ONE breaker panel. Ground (the bare copper wire) and Neutral (white wire in the US) are “bonded” at the breaker panel, meaning, connected. Ground goes to a ground ROD outside, outside the footer, usually a copper-clad steel rod (some use copper pipe which is fun to install)
Now someone wants to install a SEPARATE box, a SUBPANEL which is tapped off the main breaker panel, this box doesn’t have a separate grounding rod (I’ve read where others have done this) AND neutral (the “return” line for the hot feed) is STILL going to the ground rod(s) by the house (NEC code, IIRC, now requires two, connected to each other. I used Erico Cadweld one-shot thermite welding to fuse #4 copper wire to each ground rod for my ham radio tower), bottom line being, ALL ground goes into THE GROUND, the same ground (earth) beside the house. One service panel, one ground.
Any other appliance in the house is going to be on the same circuit no matter how “isolated” it’s made as hot and neutral go to the “appliance” (including stereo gear) and neutral is BONDED to GROUND at the panel - again - the ground lead going to the ground ROD.
It’s why so many people are using power conditioners on their equipment.
Hope this helps. And puh-lease, “experts,” geeks, dweebs, techies, “I’ve been an electrician for 40 years” guys, save it for another forum.