@norust said:
I was able to touch base with the electrician first thing this morning and now have him running two dedicated lines vs one.
FWIW, there is a very good chance the "electrician"(s) that install the electrical service, branch circuit wiring and trim out electrical devices and light fixtures in your new home are Residential Wireman. There is also a very good chance he/she does not have any experience with branch circuit wiring for feeding audio equipment. Therefore you the audiophile/home owner may want to give them some specifications, you want them to follow. (What you suggest must meet AHJ bare minimum electrical safety standards/requirements)
You will first have to give the list of specs, requirements, you want the residential electrician(s) to follow, to the Electrical Contractor, they work for. He may require more money for what you are requesting, wanting. Good chance he will... Time, labor, and material used, is money...
You are not trying to tell the Residential Wireman electrician how to do his job. Electrical Specs are the norm in commercial and Industrial buildings/facilities. Same for expensive custom built houses.
Unless there are specific specs given before the Electrical Contractor gives the builder his price, the Electrical Contractor uses bare minimum electrical safety code to bid the electrical job. Therein the AHJ (Authority Having Jurisdiction) bare minimum standards/requirements for the area the house is being built. Usually the electrical installations is no more, or, no less than AHJ code. The AHJ may adopt all of the NEC or may delete parts of the NEC and add their own requirements. The AHJ, has the final say...
Example of one bare minimum NEC requirement. NEC requires an individual 20 amp GFCI branch circuit to feed receptacle outlets installed in a bathroom(s), one on each side, within 3ft, of the basin above the countertop. This meets bare minimum NEC code.
Lets say your home has four bathrooms. Unless you specify otherwise per NEC code all four bathrooms receptacle outlets above the basin countertop can be fed by a single 20 amp individual branch circuit. (Want to guess how the wiring will done? The cheapest way. One 20amp branch circuit will fed all four bathrooms.)
Do you have any daughters living at home? What are the chances of the wife and one or more daughters using hair dryers at the same time in the morning, getting ready for school and or work?
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You can spec what type of branch circuit wiring you would like to have installed and follow best practices for the installation of the branch circuit wiring, that will feed your audio equipment. You can exceed bare minimum AHJ requirements. It can not be less than AHJ requirements.
Example, You don’t want TR, (Tamper Resistant), duplex receptacle wall outlets installed on the two dedicated branch circuits. You want these 20A Furutech audiophile duplex receptacles you bought installed instead. The Furutech outlets are not TR outlets. I am not sure if they are even Listed. The electrician will tell you he/she can not install them. They do not meet code. The Electrical Inspector will Red Flag the outlets.
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Recognized best practices for branch circuits used to feed audio equipment.
1) Both 120V 20A branch circuits should be fed from 20 amp breakers that are connected to the same Leg, Line, in the Electrical Panel. Both from Line 1 or both from Line 2. If the residential electrician questions that and says he/she normally would balance the two 120V circuits, one on L1 and the other on L2, tell him all the 120V loads of you audio equipment added together is probably less than 8 amps continuous load. Digital equipment 120V loads are squat...
2) 120V Dedicated branch circuit for audio equipment.
A raceway or cable that only has,
One Hot conductor.
One neutral conductor.
One equipment grounding conductor.
A true dedicated 120V branch circuit does share a raceway or cable with other branch circuit wiring. (Again induced voltage problems.)
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3) Type of branch circuit wiring used. NM sheathed cable , (Romex trade name), is probably the most commonly used. (Unless the AHJ in your area doesn’t allow it. Some don’t.)
Two wire, with ground, Romex is good if best practices are followed when installing it.
1) Twisting of the cable should be kept to a minimum. Twisting can change the Lay, position, of the Equipment Grounding Conductor, EGC, in relationship to the Hot and Neutral current carrying conductors. Result, an induced voltage onto the EGC.
2) The two Romex cables should not be ran parallel against, along, side one another. They should be separated by at least 8" or more from one another after getting out of the electrical panel, as soon as practicable, all the way to where the wall outlet boxes are installed. The two Romex cable should NOT be ran through a single bored hole through wall studs or joists. Problem here, induced voltages from the hot and neutral current carrying conductors from one Romex cable on to the other Romex cable. It kind of defeats the purpose for installing dedicated branch circuits, (to decouple the power supplies of digital equipment from analog equipment), if the two Romex dedicated branch circuit cables are installed running parallel against one another.
3) Here is the tough one. Avoid running the two dedicated branch circuits in close proximity of branch circuits that are used to feed noisy harmonics loads. Examples, LED lighting, lighting dimmers, kitchen branch circuits, (refrigerator, microwave, ect, and any other such branch circuit wiring connected to such loads. All can induce noise on the Romex wiring. The Object of the Dedicated branch circuits to be clean as possible from EMI and harmonic distortion loads noise being induced onto them, from other parallel running branch circuit wiring in very close proximity.
An Overview of Audio System Grounding & Interfacing
Read page 16, and pages 31 thru 36.
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Integrating Electronic Equipment and Power
Read pages 11,12,13.
Page 25.
Furthermore, if a signal cable is connecting two pieces of
ungrounded equipment powered from opposite phases, the leakage current flowing in it will increase (causing more noise) as compared
to powering the equipment from the same phase
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4) Wire size of the conductors used. Per NEC code the minimum wire size for a 20 amp branch circuit wiring is #12awg copper. That’s bare minimum. You can go bigger if you want. If the length of the wiring is less than 50Ft and you are not using a big wattage power amplifier, and like listening to your music loud then #12awg copper would probably be ok...
Over 50ft (distance measured to, up, down, and around), you will find a lot of audiophiles move up to #10awg solid copper wire. A little extra cost now, mostly material, very little labor increase, if any, but it should be a one time install. It eliminates the what If I had installed #10awg wire at a later date in time. (Breaker at the electrical panel is still an AFCI 20A. The breaker determines the ampere rating of the circuit.)
FWIW, unless the branch circuit is really short I would use #10awg solid copper wire.
5) Type of branch circuit wiring used to feed audio equipment,
I recommend 10/2 MC (Metal Clad) solid copper wire, aluminum armored cable. Follow the same best practices for installation as for Romex above. (Though, worth noting, there is less of a chance of induced voltage from one cable to the other.)
*** NOT AC / BX armored cable. ***
https://forum.audiogon.com/discussions/new-electrical-wiring-specifications
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FWIW...
NEC, Article 90
Quote:
90.1 Purpose
(A) Practical Safeguarding. The purpose of this Code is the practical safeguarding of persons and property from hazards arising from the use of electricity. This Code is not intended as a design specification or an instruction manual for untrained persons.
(B) Adequacy.
(A) Covered. This Code contains provisions that are considered necessary for safety. Compliance therewith and proper maintenance result in an installation that is essentially free from hazard but not necessary efficient, convenient, or adequate for good service or future expansion of electrical use.
"but not necessary efficient, convenient, or adequate for good service or future expansion of electrical use."
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NEC and AHJ could care less if you have ground loop hum or how an audio system sounds. Is the electrical installation and wiring safe? Code is satisfied.
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