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In Reply to: Re: More on the listening room as an evaluation tool posted by Srajan Ebaen on January 18, 2007 at 02:10:24:
"Installing separate system grounds with copper rods in the yards is something most end users who rent won't ever do"This is illegal and an incredibly dangerous practice. What can happen here is that in a near lightening strike the current/voltage can travel from one earth ground rod to the other through the wiring of the house. This is not something anyone should wish for. I have a had one piece of equipment returned to me when this happened in a customers system, and I bet he's still wondering why his surge suppressors didn't work.
If you are a responsible reviewer, and check with your electrician on this, please do not recommend this practice to anyone in the future. In fact you would do your readership a service by warning them of the hazards of doing this.
Disregard all of the above if you are seriously trying to win the Darwin award.
d.b.
Follow Ups:
The ground rod installations I was referring to are fully encapsulated affairs used by Japanese recording studios. While I haven't studied all the specs nor done it myself, I have talked to people who have. Unless I missed something (and some of these were manufacturers of power products), they thought this solution perfectly safe and legal. It was a rather expensive kit that included professional installation by an electrician.
The last I knew it was outright illegal to do this for residential installations. For professional/industrial installations both ground rods must be tied together with something like #2 AWG wire. This is technique is rarely done in industrial applications here to the best of my knowledge.However: This does not excuse you from disseminating this information as something for audiophiles to think of. In short; ignorance of the law is no excuse in this country, and I think you owe your readers an explanation and an apology.
d.b.
Time out. I didn't condone, suggest or recommend any of it, I merely made a mention higher in this thread about certain tweaks some audiophiles are willing to implement which ordinary music lovers wouldn't or couldn't and that hence, there's an argument to be made that reviewers not go overboard tweaking too much since they'd go beyond what the average customer liable to buy the stuff they're reviewing could or would duplicate.Both the Magnan and Galen Carol Audio websites mention specialized earth grounding and I've also seen it references on the PureAudio site. Sound Application had first mentioned a specialty Japanese implementation which he was considering importing as a kit. Not sure whether he ever did. Additionally, I know people who've hired electricians to install these kits to measure a severe drop of impedance on their ground leg with reportedly very audible effects.
That's all she said on that topic and insinuating anything more is putting words in my mouth. -:)
About 8 years ago when I was working on high power radar transmitters we had a 3/8 inch copper pipe that led back to the main panel for a safety ground. It was very effective in discharging 25 Kv and the instantaneous current that went with it.
The point of this is, is that Audiophiles/Recording people seem to love going the most expensive route available, as in digging up the ground to install an additional rod and wiring the two together, when all you needed was a run of copper pipe back to the main panel.
d.b.
Bill Whitlock's Jensen paper on the subject contains this quote: "If multiple ground rods are used, Code requires that they all must be bonded to the main utility power grounding electrode."
"This is illegal and an incredibly dangerous practice. What can happen here is that in a near lightening strike the current/voltage can travel from one earth ground rod to the other through the wiring of the house. This is not something anyone should wish for. I have a had one piece of equipment returned to me when this happened in a customers system, and I bet he's still wondering why his surge suppressors didn't work."I don't think you really understood this Maybe you need time to think about it.
d.b.
That's what I said when I mentioned "back to the main panel"
d.b.
I've got half my back yard dug up... please don't tell me it was all for naught! If you're serious I swear I'm gonna sue that guy!
No Guru, No Method, No Teacher
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