High quality in-wall UL-C2 rated 10-gauge A/C wiring ?

@jea48 
The breaker limits the current below the wire ampacity. A 15A circuit has 5A current reserve capacity in the wire according to the NEC.

From Pass:

Typically, a Class AB stereo amplifier rated at 200 watts per channel continuously should be capable of delivering 700 watts or so, and this means a transformer rating of about 2000 watts. Anything less means non-continuous operation. This might be alright for a class AB amplifier where maximum continuous operation is not required.

Confirms that most systems do not require 20A. Any humongo transient that occurs when the 120v line is 0v is going to suck down the caps regardless of the transformer size. The supply capacitors need to be of sufficient capacity and low ESR to handle the transients supplying the required current without falling below the required voltage.

Toroids are somewhat fan-boy sales bait. They are not a free lunch.
http://www.soundstagenetwork.com/maxdb/maxdb071998.htm

I'd read Ralph's post and agree with him.

Table 310.15(B)(16):
          60°C     75°C      90°C
          TW       THWN    THHN
14ga  15A        20A         25A

Encore Wire NM-B : Color-coded Polyvinyl Chloride (PVC) compound meeting the required thickness of Type THHN or THWN-2 with a heat-stabilized Nylon jacket rated for 90°C in dry locations.
https://www.encorewire.com/wp-content/uploads/EncoreWire-NMB.pdf

The NEC de-rates 14ga to 15A per circuit by breaker.

Table 310.15(B)(2)(b) allows increasing a 90°C current rating by 14% below 25°C in some installation types.

The bottom line is 14ga is not going to starve the typical HiFi.

What will gum up the works are ’sh.tty’ daisy chain ’quick-connects’ so typical of modern construction.

ieales

356 posts
06-10-2019 1:46pm

Table 310.15(B)(16):
60°C 75°C 90°C
TW THWN THHN
14ga 15A 20A 25A


Encore Wire NM-B : Color-coded Polyvinyl Chloride (PVC) compound meeting the required thickness of Type THHN or THWN-2 with a heat-stabilized Nylon jacket rated for 90°C in dry locations.
https://www.encorewire.com/wp-content/uploads/EncoreWire-NMB.pdf

The NEC de-rates 14ga to 15A per circuit by breaker.

Table 310.15(B)(2)(b) allows increasing a 90°C current rating by 14% below 25°C in some installation types.

The bottom line is 14ga is not going to starve the typical HiFi.

What will gum up the works are ’sh.tty’ daisy chain ’quick-connects’ so typical of modern construction.

None of your post addresses Voltage drop.

You throw out a Link for NM-B and disregard the footnotes below the chart. Did you even check them out?

Here is some reading material for you.
https://www.ecmag.com/section/codes-standards/sizing-conductors-0

What will gum up the works are ’sh.tty’ daisy chain ’quick-connects’ so typical of modern construction.

But don’t worry the wire is rated for 20 amps. As long as the insulation is rated 75C, and all of the termination connections are rated 75C.  No need to worry about VD, Voltage Drop, for what ever reason on the branch circuit. The 15 amp circuit breaker will pass a continuous load of 15 amps all day long without tripping. If the Voltage is bouncing around due to a power amplifier being driven hard playing a high dynamic music source Just blame the distortion heard solely on the amplifier.

Food for thought. When using the formula for single phase voltage drop on a circuit the temperature rating for the insulation covering of the wire is not part of the equation.
Example:
http://www.adamselectric.coop/wp-content/uploads/2015/02/Voltage-Drop.pdf
.

We're getting lost in the weeds. 14ga wire will power most any HiFi without any problems providing the wiring is up to snuff.

Most modern houses have ’sh.tty’ daisy chain ’quick-connects’  and a fancy power cable at the end of a series of ’sh.tty’ daisy chain ’quick-connects’ ain't gonna do jack. 

Just FYI, I removed all the ’sh.tty’ daisy chain ’quick-connects’  in my house [100s of them] because they eff-up everything from my espresso machines, to our waffle makers, to the missus iron, blow-dryer, etc.

I had a 3v drop form one side of our media room to the other just due to the ’sh.tty’ daisy chain ’quick-connects’  on a lightly loaded HT circuit.

Removed the oxidation, and screwed the terminals down gas tight and now nary a VD to be found.

PAX