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

---

[ Follow Ups ] [ Post Followup ] Thread: [ Display  All  Email ] [ Tweakers' Asylum ]

---

[ Alert Moderator ]

---

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

Posted by jea48 (A) on November 24, 2014 at 09:51:54

In Reply to: Running 2 Romex 10 gauge circuits thru the wall 20 feet posted by wsill on November 23, 2014 at 16:40:03:

Unless you have already bought the #10-2 with ground Romex for a 20' run, #12-2 with ground will work the same as the #10. A 20' run is nothing in the scheme of things. But that is your choice.

Bored holes through studs are a very good support and meets NEC Code. Holes shall be bored 1 3/4" from the face to protect the cable from screws or nails from damaging the cable by the installation of wallboard/wall covering.

A staple is required within 12" of the outlet box, and if run parallel along framing no farther than every 4-1/2' apart. Be careful when using staples do not damage the outer sheath of the cable. Snug is all that is needed.

I would recommend the two parallel runs be separated by at least 6" to 8" to help stop what is called the transformer effect of the magnetic fields of the two branch circuits from interacting with one another. Also a gentle twist of the cable's length before it is pulled through the bored holes helps cancel the transformer action of the hot and neutral conductors and the bare equipment grounding conductor. Not a tight twist, do not distort the outer jacket of the cable.
Jim

Quote from Link below.
Page 31

Overview of Audio System Grounding & Interfacing
Bill Whitlock, 9/4/2012
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
∆I/∆t
•
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.

• http://centralindianaaes.files.wordpress.com/2012/09/indy-ae   (Open in New Window)

Edits: 11/24/14

This post is made possible by the generous support of people like you and our sponsors:

---

[ Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2024, Audio Asylum, all rights reserved ]

---

[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]

---