Will you be measuring it on various outlets, extension cords, power cords ?
determining the ASC is essential for calculating wire diameters, lenghts and fuses/circuit breaker properties when designing electrical wiring.

For stereo equipment this would relate to the inrush currents mainly ?
The ASC will generally be MUCH higher than that of the power transformer in audio devices.

Interested to see if there is a relation and how that relation can be shown.

Will you be measuring the actual currents (using an oscilloscope to evaluate actual wave forms and peak currents) in the mains cables of individual equipment in 'operational' state as well ?

I have measured it on my 'standard' house power distribution system as well as my dedicated runs for the audio and computer system using 9 different cables.

That's the interesting thing about ASCC it essentially measures short duration, high amperage availability of the branch circuit.

Alas I wish I had a 'calibrated' and tweako O-scope setup, but all I have are 2 handheld AC circuit load testers.  One is the Extech CT70 and the other is a General CA10.  Neither is calibrateable nor do their readings always agree on these peak current readings.

But they both show the same trends and show a relationship between the increases in current dumping ability and wire gage and type of circuit being tested.  Which tells me that while I can't 'trust' the specific numbers I can use the trends and patterns as confirmation of the effects, especially when 2 separate units confirm these patterns and trends.

As for measuring all of this in realtime on my gear that is in my system, again no, I'm not set up to be able to 'tear into' my Rok nor my PWD and monitor these actual values in situ.

But the results are interesting none the less.
At least I think so.

JJ

I have already done some real life measurements a while ago.
Not regarding fuses but currents in rectifiers, so on the secondary side.
It is good to know that the currents drawn on the primary side are the same factor lower than the voltage factor a transformer has.

This may be an interesting read.
https://diyaudioheaven.wordpress.com/tutorials/power-supplies/
scroll down to the rectifier section (5) and don, t forget to read the snubber section (6) as well.
Forget about my objectivistic vieuws and read over that in the knowing I don, t have any audio knowledge at all.

The measurements are made with single phase rectifiers, with bridge rectifiers the , on time,  and currents will be shorter.

Edit: I added examples of a 160VA trafo with an 80W load with single- and dual-wave rectifiers in the article: https://diyaudioheaven.wordpress.com/tutorials/power-supplies/.
Numbers below have been altered accordingly to those measurements.

Of course things change when a bridge rectifier is used. They change for the better as the capacitor is charged double the amount of time.
For 60Hz the currents will probabaly even be a factor 0.9 smaller as the capacitor is charged is a faster rate namely every 8.3ms instead of 10ms.

To estimate the peak currents that are present with the rag will thus depend on power usage and rating of the transformers used.
The power transformer is 400VA and the smaller one 75VA so lets assume 500VA in trafo and at max ouptut power 500W is drawn.
This will never be continuous but peak only when listening to music at almost distortion levels the actual power drawn may be around 300W or lower.
Acc to Schiit's power ratings the currents drawn are 4.5Arms (at peak loads) and 0.7Arms in idle (while driving HP's the output load won't increase much, say 1.2Arms at the most).

I assume dual phase rectifiers are used so the peak currents will be lower and the pulse duration will be shorter compared to the example.
In the 160VA example a 1:3.5 ratio was found for 50Hz in between peak currents (12.5A) and drawn continuous current (3.55A).
At 60Hz the time between 'replenishments' is 20% shorter so the ripple will be smaller and the currents will be smaller.

Assuming worst case (inrush and max power drawn) of 500W and 115V mains voltage this would be 4.4A rms. Because the peak currents are a factor 3.5 higher in my tests (50Hz) the factor will likely be slightly above 3.2 for 60Hz. It would be reasonable to assume a 400VA trafo will act quite similar to a 160VA trafo. The peak currents will thus be around 14A peak when 500W is drawn.
When driving HP's at deafening levels around 3.5A peak.

Don't have a Ragnarok so cannot check it but figure these numbers won't be that far off.

When you have a poor mains wiring (say 1 Ohm) the 14A peak would drop the input voltage at the trafo by 14V peak while the mains 115V has peak voltages of 162V.
The rms voltage on the mains input will thus 'clip' close to '106V RMS' and will be causing harmonics on the mains due to flattening of the sine wave.

For us Europeans (50Hz, 230V) the current will be about twice as low and because our peak voltage is higher as well (325V) the penalty is less percentage wise as the drop would only be about 8V.
Of course in the USA the wiring in the house is thicker and fuses are rated higher.
In the EU most fuses are 16A, some 10A in normal houses.