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In Reply to: RE: Clean Ground posted by skudra on September 21, 2014 at 11:18:44
http://centralindianaaes.files.wordpress.com/2012/09/indy-aes-2012-seminar-w-notes-v1-0.pdf
go to page 29.
AB.
Follow Ups:
if you have another conductor linking the two ground rods, you have zero resistance between them and are not using your house as a resistor when there's a voltage differential at the two ground rods.
if you have another conductor linking the two ground rods, you have zero resistance between them and are not using your house as a resistor when there's a voltage differential at the two ground rods.
If the installation is done per NEC code, where the auxiliary ground rod is connected to the branch circuit safety grounding conductor, theoretically that would be true. Even then the point would be mute because the power cord safety equipment grounding conductor of any connected audio equipment would be tee tapped off of the equipment grounding conductor connection of the branch circuit safety equipment grounding conductor.
Again my problem with an auxiliary ground rod is lightning. A lightning strike can travel horizontally through the earth for many miles. Current will always take a least resistive path when one is provided. I would not want a large current flow from a nearby lightning strike to travel through a #12 awg branch circuit safety equipment grounding conductor. Also the lightning strike voltage can be 10s of thousands of volts. The insulation cover on the hot and neutral conductors of the branch circuit is rated for 600 volts.
If the OP believes the myth the earth possess some magical mystical power that sucks RFI/EMI from his audio system and wants a lower Grounding Electrode resistance to earth then I would suggest he do so at the main electrical service earth connection.
He can hire a Power Quality company or a commercial/industrial electrical contractor to check the electrode to earth ground resistance.
ANSI/IEEE recommends a ground resistance of 5 OHMS or less. NEC Code only says if the ground resistance is greater than 25 Ohms it shall be augmented by one additional ground rod. That's it. No further testing is needed. If the initial test was 100 OHMS only one additional rod is needed. End of Program. Food for thought how many residential electricians check the ground resistance? None that I know of.
Keep in mind the main purpose for the earth connection of the service neutral conductor to earth is for lightning protection..
.Henry Ott
hottconsultants.com-pdf_files-ground.pdf
Edits: 09/24/14 09/24/14
This topic of "separate" ground rods keeps coming up over and over on AA and other forums. It seems like there should be a sticky on the subject.
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