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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

RE: Running 2 Romex 10 gauge circuits thru the wall 20 feet

As long as the voltage isn't sagging much, and the power supply has decent reserves, I can't think of any other *measurable* reasons to worry about the cable type -

Quote from Link below.


Bill Whitlock, 9/4/2012 Overview of Audio System Grounding & Interfacing

The “Conduit Transformer”

• This finally explains what drives 99% of all ground loops!
• Load current in line and neutral produces opposing magnetic fields
since instantaneous current flow is in opposite directions
• Imperfect cancellation magnetically induces voltage over the
length of the nearby safety ground conductor
• Strongly affected by geometry and proximity of wires
• Highest voltages with randomly positioned wires in conduit
• Lower voltages with uniform geometry of Romex®
• Voltage is directly proportional to load current, wire length, and
rate of change in current or ΔI/Δt
• Mechanism favors high-frequency harmonics of 60 Hz
• For constant current in L and N, induced voltage rises at 6 dB/octave

The favoring of higher harmonics of 60 Hz is why we usually hear “buzz” more often
than the more fundamental 60 Hz “hum” and why light dimmers have such a horrible
reputation for “causing” noise problems.

Read pages 31 through 39.

Not all branch circuit wiring materials or wiring methods are created equal.





Edits: 12/12/14

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  • RE: Running 2 Romex 10 gauge circuits thru the wall 20 feet - jea48 09:30:44 12/12/14 (0)

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