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Really Victor? I didn't know that..

Like I said it depends on the design of the audio equipment. If the designer was under the impression that earth has some mystical magical power that will suck EMI/RFI noise from his equipment and the designer connects the signal ground to the chassis safety equipment ground then yes long multiple dedicated runs may cause ground loop hum problems. I have seen the same problem where said equipment is plugged into the same duplex receptacle fed from the same branch circuit. What does the manufacture suggest the user do in that case? Use ground cheaters?

I have also seen ground loop hum problems where only one new dedicated branch circuit is installed and the user uses an existing convenience outlet receptacle circuit to power other equipment that is connected together by ICs. This can definitely cause ground loop hum problems.

IF the run is long and the connected load is small make sure the wire is the same gauge and approx the same length. Also as in my case I installed #10 ga wire. Over kill? Maybe but my system is dead quiet.

I would rather have multiple dedicated audio branch circuits of say 40' to 50' long than multiple dedicated audio branch circuits of 10' or less. Not much power supply decoupling going on with 10' or less long branch circuits.
Jim



Edits: 08/19/14
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