millercarbon
The next step up from this is to drive an extra ground rod dedicated to the one system circuit. Oh no, that's potentially lethal and an NEC code violation. All grounds must be bonded together with the neutral in the service panel. No exceptions. |
@ jsautter
Mother earth does not posses some magical, mystical, power that sucks nasties from an audio system
Grounding Myths
From Henry W. Ott’s big new book "Electromagnetic Compatibility Engineering"
3.1.7 Grounding Myths
More myths exist relating to the field of grounding than any other area of electrical engineering. The more common of these are as follows:
1. The earth is a low-impedance path for ground current. False, the impedance of the earth is orders of magnitude greater than the impedance of a copper conductor.
2. The earth is an equipotential. False, this is clearly not true by the result of (1 above).
3. The impedance of a conductor is determined by its resistance. False, what happened to the concept of inductive reactance?
4. To operate with low noise, a circuit or system must be connected to an earth ground. False, because airplanes, satellites, cars and battery powered laptop computers all operate fine without a ground connection. As a mater of fact, an earth ground is more likely to be the cause of noise problem. More electronic system noise problems are resolved by removing (or isolating) a circuit from earth ground than by connecting it to earth ground.
5. To reduce noise, an electronic system should be connected to a separate “quiet ground” by using a separate, isolated ground rod. False, in addition to being untrue, this approach is dangerous and violates the requirements of the NEC (electrical code/rules).
6. An earth ground is unidirectional, with current only flowing into the ground. False, because current must flow in loops, any current that flows into the ground must also flow out of the ground somewhere else.
7. An isolated AC power receptacle is not grounded. False, the term “isolated” refers only to the method by which a receptacle is grounded, not if it is grounded.
8. A system designer can name ground conductors by the type of the current that they should carry (i.e., signal, power, lightning, digital, analog, quiet, noisy, etc.), and the electrons will comply and only flow in the appropriately designated conductors. Obviously false."
Henry W. Ott
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Right jea48. That's why I said it may or may not be better.
Right jsautter except unfortunately you have to slog through 43 pages to get to page 44 where finally they show what I clearly explained in far fewer words: plugging connected components into different outlets can cause noise. So plug all your gear into one circuit. Voila! No ground differential. No hum. Geez how hard was that?
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millercarbon443 posts
03-19-2019 6:40pm
Right jea48. That’s why I said it may or may not be better.
Right jsautter except unfortunately you have to slog through 43 pages to get to page 44 where finally they show what I clearly explained in far fewer words: plugging connected components into different outlets can cause noise. So plug all your gear into one circuit. Voila! No ground differential. No hum. Geez how hard was that? @ millercarbon , Please read pages 31 through 36. https://centralindianaaes.files.wordpress.com/2012/09/indy-aes-2012-seminar-w-notes-v1-0.pdf In most cases where the building electrical branch circuit wiring is the cause of ground loop hum it is due to the type of wiring used and or the type of wiring method that was used. I have two 20 amp branch circuits, (10-2 with ground Romex), that are 75ft each for my 2ch audio system. My audio system is dead quiet. No ground loop hum whats so ever. No difference of potential, voltage, between the two equipment grounds measured at the wall duplex outlets. Jim . |
