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#21962 - 02/11/05 02:49 PM Re: 15A circuit enough for 755?
Bandit Offline
Deputy Gunslinger

Registered: 02/10/05
Posts: 12
Loc: New Orleans, LA

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#21963 - 02/11/05 03:10 PM Re: 15A circuit enough for 755?
Bandit Offline
Deputy Gunslinger

Registered: 02/10/05
Posts: 12
Loc: New Orleans, LA
I'll do my homework, but maybe a licenced electrician would be better to advise on this subject. That way if I did something wrong I'll be more appreciative of the heads up.

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#21964 - 02/11/05 03:32 PM Re: 15A circuit enough for 755?
gonk Offline
Desperado

Registered: 03/21/01
Posts: 14054
Loc: Memphis, TN USA
Hullguy is an licensed electrician, so if he wanders past this thread he might be able to shed some light on the subject. In the interim, here\'s a good FAQ I found on google that offers some guidelines. It includes a wire size chart about half way down the page. The chart gives the following values: 14ga for 15A, 12ga for 20A, 10ga for 30A, 8ga for 40A, and 6ga for 65A. It also recommends increasing wire size for runs longer than 100 feet. Based on that, a 20A circuit should use 12ga wire. If it's long run, it should use 10ga.

Circuit breakers are interchangeable because it makes electrical panels significantly less expensive. The same space in the panel can hold a 15A breaker or a 20A breaker, and two spaces can be used for larger breakers. This interchangeability should not be construed as suggesting that you can swap out different sized breakers any time you want. The installer must still make sure that the wiring used for each circuit is properly sized for the length of run and the load.

Nutone can of course sell their units, but when they say "20A circuit" they mean the entire circuit, including wiring. If you don't have a 20A circuit available, they assume you will either run one or pay to have one run. If you don't run one, it would be better to keep the 15A breaker - it would be more likely to be tripped under certain circumstances, but it would also reduce the risk of overheating that 14ga conductor (thereby reducing the risk of fire). Outlaw recommends a 20A circuit for the 770 because its power supply is capable of using 20A of power if it is available and there is a call for it. Most 770's are connected to 15A circuits and typically share that circuit with other devices, but they still work because the 770 does not "need" that full 20A under normal circumstances. If you had a system where you were trying to wring a full 1400W of power out of the 770 at one time, you would need to either put in a dedicated 20A circuit or get used to resetting the 15A breaker. Of course, that would also require some severely loud listening levels, some very unusual source material, and probably some pretty inefficient speakers.
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#21965 - 02/11/05 10:29 PM Re: 15A circuit enough for 755?
Bandit Offline
Deputy Gunslinger

Registered: 02/10/05
Posts: 12
Loc: New Orleans, LA

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#21966 - 02/11/05 10:57 PM Re: 15A circuit enough for 755?
Bandit Offline
Deputy Gunslinger

Registered: 02/10/05
Posts: 12
Loc: New Orleans, LA
Speaking of speakers, I'm running my Studio 60's and CC470 on large, and surrounds on small, oh I also have a Klipsch RSW 10" Sub, 385 Watts w/front and rear firing woofers.

If I get the 755, do you think my system would benefit from the Outlaw Audio ICBM-1, according to the Outlaw write up, it's more for large fronts with no sub, or a satleite system with a sub?? My Sony STRDA3ES suprising has allot of high, mid and bass management for a receiver.

Time for spring in new orleans....and I'll celebrate with a new amp!!

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#21967 - 02/11/05 11:26 PM Re: 15A circuit enough for 755?
gonk Offline
Desperado

Registered: 03/21/01
Posts: 14054
Loc: Memphis, TN USA
I used the 750 (the 755's predecessor) with the Studio/60's set to large for a year or so (prior to getting a subwoofer) with very good results. I would have no qualms about recommending it - especially if you are currently driving them with a receiver. As for multichannel, well, that's pretty much the 755's reason for being, and it does it well.

I don't know much about the Sony's bass management, but the ICBM is intended to provide flexible bass management (separate crossover adjustment for front, center, surround, and surround back) for any sort of speaker combination.
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#21968 - 02/12/05 11:41 AM Re: 15A circuit enough for 755?
ScottH Offline
Gunslinger

Registered: 10/07/02
Posts: 83
Loc: NY, NY, USA
I am currently running 7 M200s, my sub amp, my RPTV, the rest of my components and the room lights on a 15amp circuit. I have never tripped the circuit. In the kitchen, however, a microwave and the refrigerator share a circuit that I have tripped. I am not an electrician. But I did a fair amount of research on this topic before running some electrical circuits in a basement. In exposed space, I was required, by code, to run 20amp circuits.

If you want a 20amp circuit, you need a 20 amp breaker, 12 gauge wiring and a 20 amp receptacle. The code is very clear that is NOT ok to use 14 gauge wiring for a 20amp circuit. Today, 12 gauge Romex has yellow outer sheathing while 14 gauge Romex has white outer sheathing.

I’m sure the code has a lot of over-kill built into it. Although most places use the standardized code, they do not have to. I see that Bandit is from New Orleans, and Louisiana does have a different legal system vs. the rest of the country. So I do not know if the advice Bandit got from the home inspector is acceptable where HE lives. I do know that it is NOT acceptable where I live. As Wharf Rat said, I believe you are opening yourself up to legal liability, if damage is caused by work that wasn’t up to code.

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#21969 - 02/12/05 12:38 PM Re: 15A circuit enough for 755?
gonk Offline
Desperado

Registered: 03/21/01
Posts: 14054
Loc: Memphis, TN USA
Since I have an "affliction" for knowledge (wonder if there's a support group?) and have a pretty good background in building codes because of work, I checked into Louisiana's codes. The state-adopted codes are the 2000 International Building Code, the 1999 National Electric Code, and the 2003 NFPA. IBC is becoming the national standard (Tennessee is adopting it in place of the Standard Building Code this summer because SBC is being phased out). NEC and NFPA are both widespread and have been for quite some time.
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#21970 - 02/12/05 03:29 PM Re: 15A circuit enough for 755?
painttoad Offline
Desperado

Registered: 10/25/04
Posts: 688
Loc: peoria il
gonk, if you really need help with your "problem", perhaps writing all that knowledge down on paper would help.staple it together,call it GONK:THE OUTLAW,and sell it through the outlaw store.i'll preorder mine now!

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#21971 - 02/17/05 04:54 PM Re: 15A circuit enough for 755?
lmHT Offline
Gunslinger

Registered: 02/01/05
Posts: 42
Loc: Columbus, OH
Always remember that the sole purpose of a breaker (Main or Circuit) is to protect what it is feeding. In most cases the breaker is feeding an electrical wire (Circuit), except for the MAIN breaker, which protects the electrical BUS bars in the breaker box to what the breaker box, is rated for (i.e. 100A, 200A, etc.).

If you did put a larger BREAKER on a smaller gauge wire (NOTE: The higher the # the smaller the wire) then you have put that given circuit at risk of getting the wire hot which could cause it to melt or worse, catch on fire.

So with that being said, you should NEVER increase the breaker size unless you are FOR SURE that the wire meets the gauge requirements for the circuit.

GONK has the correct gauge sizes above...
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