Wiring 2 outlets to 2 dedicated 20 amp circuits with a single 10/3 electrical wire.

EDIT:

  (12-20-2022 at 10:08pm post)   jea48 said:     

A multiwire branch circuit is merely an extension of the split phase winding of the utility power transformer.

Replace the word merely  with the word basically.

A multiwire branch circuit is basically an extension of the split phase winding of the utility power transformer.

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In this case each circuit does have a separate breaker. The voltage is being sent to the outlet from separate starting points on the panel.

The issue i see is the neutral going back to the panel. And here the neutral wires are joined between the outlets and then directly wired back to the appropriate spot on the panel. Further, the ground similarly is being handled the same way and routed back to the panel. The two hot conductors are separate, from their own breaker, in support of the outlets.

It's crystal clear this is not a true dedicated circuit.  But that's not the issue. The issue is trying to clarify why noise somehow is affecting the outlet in a manner that impacts performance of a system.

@emergingsoul said:

The issue is trying to clarify why noise somehow is affecting the outlet in a manner that impacts performance of a system.

Maybe why noise from one circuit is affecting audio equipment connected to the other circuit of the multiwire branch circuit.

Lets try this again.

Just for an example.

Say on circuit Hot L1 conductor (coming from the electrical panel) you have a total connected 120V load of digital equipment of 2 amps.

Say on Hot L2 conductor (coming from the electrical panel) you have a 120V analog integrated amplifier load of 2 amps.

L1 = 2 amps.

L2 = 2 amps.

Load is Balanced on both L1 and L2.

Because of the way a multiwire branch circuit works Zero amps will return on the shared neutral conductor to the source).

So where is the circuit for the current (amps) to flow back to the panel, (source)?

The two connected loads are in series with one another. The shared neutral conductor from the panel is not involved.

One line diagram.

L1 conductor from panel >>> digital load >>> in series with >>> integrated amp >>> L2 conductor from panel.

The two series loads are being fed by 240V. (There is still a voltage drop across each load of 120V... 120V + 120V = 240V.)

So hopefully you can see the noise from the digital equipment, (if present), will be transferred to the primary winding of the power transformer in the integrated amp in the current as it passes through the primary winding back to the source on L2 conductor.

 

 

/ / / /

 

 

Note:

The source is actually the 120/240V split phase secondary winding of the Utility Power Company’s step down transformer.

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jea48,
 

You say that, Zero amps will return on the shared neutral conductor to the source).

Not sure why this would be happening. And then from this point on in your response above I sort of lose an understanding of what you're saying.

But I'm really trying to follow. And I think for many it would be nice to know the rationale here as well, as this is a very profound issue.

@emergingsoul said:

You say that, Zero amps will return on the shared neutral conductor to the source).

Well it’s a fact... That is how a center tapped single phase 120/240 secondary winding of a step down transformer works.

Watch this video again. Make note the guy has the switch opened on the shared neutral conductor and the two light bulbs stay lit. The two light bulbs are in series with one another. At one point in the video he removes one of the bulbs, (breaks the series circuit), the other light bulb goes out. He reinstalls, (completes the circuit), and both bulbs are lit again.