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Audio Component Grounding and Interconnection
Audio Component Grounding and Interconnection
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Old 24th January 2021, 09:56 AM   #51
russc is offline russc  England
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Location: W Yorkshire
Not at all. Think of it as one extra thick grounding cable.
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Old 24th January 2021, 11:15 AM   #52
campbellr is offline campbellr
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Thank you. Advice much appreciated.
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Old 16th March 2021, 02:15 AM   #53
therling is offline therling  United States
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I just wanted to say that your article of almost eleven years ago (as of March 2021) is still a valuable resource.
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Old 5th April 2021, 04:07 PM   #54
Tiguarist is offline Tiguarist
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This masterpiece still deserve kudos, so kudo.
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Old 10th April 2021, 03:25 AM   #55
Mello4 is offline Mello4  United States
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Originally Posted by russc View Post
Each IEC MUST have its earth connected.
Otherwise, should one or more not be plugged in fully for any reason, accidentally or otherwise, you would lose the safety ground.
It will cause no audible detriment.

Many old houses in the USA only have two wire outlets & for those houses the third wire ground is completely useless.. The neutral (white wire) is somewhat referenced to ground. The black wire is definitely hot.

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Old 10th April 2021, 03:54 AM   #56
rayma is online now rayma  United States
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Yes, however many USA home outlets are also wired backwards.
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Old 10th April 2021, 05:51 AM   #57
Mello4 is offline Mello4  United States
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Originally Posted by rayma View Post
Yes, however many USA home outlets are also wired backwards.
With a two wire to three wire adapter and a tester, one can check the wiring.


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Old 21st July 2021, 07:51 PM   #58
weltersys is online now weltersys  United States
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Originally Posted by Mello4 View Post
With a two wire to three wire adapter and a tester, one can check the wiring.
Unfortunately, most simple testers will not detect a potentially lethal mis-wire, the reverse polarity bootleg ground (RPBG).

A bootleg ground is a wire jumper connected between the bonding screw terminal to the outlet's neutral connection. This practice is a NEC code violation, but a standard 3-lamp receptacle tester will report the outlet as correctly wired, often passing electrical inspections.

An RPBG has hot and neutral wires connected to the opposite terminals (reversed polarity) with the jumper or pigtail connection (bootleg ground) placing live voltage on all grounded parts of all equipment plugged into that outlet, thus allowing people to come into contact with a deadly voltage with a current path back that will not trip a normal circuit breaker, or a GFCI.

Further information on the RPBG can be found here:

Failures in Outlet Testing Exposed | EC&M

A non-contact voltage tester (NCVT) can be used to detect RPBG outlets.
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Old 10th October 2021, 04:07 PM   #59
HiDave is online now HiDave  United Kingdom
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This thread is one of many that I used when "trying" to understand the best way to to stop my double insulated (no requirement for electric safety earth) components giving me static shocks!....(The measured potential difference was within the allowed limited for Double insulated).

I might have to revisit what I did & modify, but for now it works....Basically thick cable of suitable voltage/current capacity) soldered to eye terminal sandwiched between the join of the back panel & side panel where there is a screw, as bare metal in the join. This on all three items (network player, amp, CD). The CD & network player connect to the connection on the amp. The amp connection goes to an insulated block with a class x/y cap & a resistor in parallel. This then goes to the earth pin in a plug which is plugged into the mains filter block as per a normal plug.

This now keeps the whole casework at the same potential as earth therefore its no longer "floating" & cannot give off static shocks!

Where I am the electrical safety earth is actually the neutral & actually the armour as we are on PME & single core incomer cable to the fuesboard. Then off course all gas pipes, water pipes & metal sinks & taps are connected to the earth connection in the fuse board to x-bond as per the regs.

I still think I need to add a bridge rectifier maybe next to the cap & resistor?? I also still think that a couple of the back panel connections on the network player are purposely connected to the casework as outputs.....need to have another detailed look...!!!
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Old 28th October 2021, 07:49 AM   #60
ZackPlonk is offline ZackPlonk  Germany
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Originally Posted by SandroN View Post
My SE amp (L' Amp - L’Amp: A Simple SIT Amp: Part 1 - diyAudio) was done with star-grounding. Transformer has 2 secondaries, so I've built 2 PSU (1 for left and 1 for right). Their ground go to star. RCA shield from each channel input and its bias ground go to local references (source of FET).
- With inputs shorted, the amp is super silent (mute).
- With open inputs, almost mute.
- With RCA cable + open ends, almost mute.
- With RCA cable + 2k resistor in each end, mute.
- If the resistors at RCA end (left and right) share the same "ground", audible hum is generated. This occurs with any source connected to the amp (CD player, DAC, etc) because their RCA shields are connected to ground.

Where is my error?

Obs.: I tried loop breaker to star point, earth to star, no earth, all without success.
I know, I'm replying to a 5 year old post but since I had to deal with almost the same problem just the other day, I'll leave a comment here and maybe that is helpful to someone at some point...

In the "not OK" case, where the RCA cable's ground is connected together at the far (source) end, a loop is formed by the two shields as these are both connected to CG in the amp. Now for example, if there is a varying magnetic field from a transformer, it will induce a voltage into that loop and a current can flow and depending on how the inputs are hooked up in the amp, that can represent a voltage drop over the amps input resistance which gets amplified.
What helped in my case:
- Ensure input jacks shield's are insulated from the chassis
- Connect the input jack's shields together on the inside
- have a single connection from there right to your star-ground

What also helps:
- Using an interconnect that uses a single lead for ground (no loop is formed but your choice of off-the-shelf cables become much constrained)
- Using an insulating transformer at the amp's input (but then you have another element in the signal path that could potentially degrade audio quality)
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