Why eould you not use the bare wire for ground ? That is its intended purpose. In romex each circuit wire has insulation and the ground is bare and all of it is in a protective sleave
Time for dedicated outlets!
I would like some advice on what exactly to tell my electrician to be sure I get what I need. Is just saying that I want two separate dedicated lines to the listening room sufficient or are there other key fraises that should be included in my description of the work I would like done?
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cerberus79 17 posts 05-06-2017 9:09pm Multiwire branch circuitshttp://ecmweb.com/code-basics/branch-circuits-part-1 "single-pole circuit breakers with handle ties identified for the purpose" The tie used must be a Listed tie for the intended purpose. Or, just use a 2 pole breaker...... Or, in the case of a 3ph. 4wire multiwire branch circuit a 3 pole breaker. Just going from memory I believe this was added to the 2008 NEC. After State and local AHJs adopted the new language, at least in my state, the 120V as well as 277V multiwire branch circuit became a thing of the past. I don’t know of anyone that installs them today, or for the last 8 years. Best regards, Jim |
@cerberus79 Please read the first 36 pages of this white paper. https://centralindianaaes.files.wordpress.com/2012/09/indy-aes-2012-seminar-w-notes-v1-0.pdf quote from page 31 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 . |
perazzi28 ... the power company does not supply a ground wire. No, you're mistaken: You're confusing ground with safety ground. They are two different, though related things. All grounds and the neutral must be tied to together at the service panel. Whether you are subject to NEC or not, failing to comply with this practice is dangerous. The ground rod - codes usually requires two of them today - is predominately for lightning protection, and is not a reliable (low impedance) path to ground. There is no magic associated with grounding rods, although many audiophiles imbue their ground systems with exceptional importance. The whitepaper linked by jea48 is an excellent treatise on how grounds work (and don't work): https://centralindianaaes.files.wordpress.com/2012/09/indy-aes-2012-seminar-w-notes-v1-0.pdf Consider that electrical systems in airplanes, cars and on boats work quite well without what you mistakenly define as a ground system. |
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