what if it not audible / below your threshold of hearing.
If only "audible" improvement count then why test it with Topping A90 that is "perfect" even 15dB below audible threshold (by Amir standards)
It might be clear to you, but it is not clear to everyone.
The same way the marking / use caes for this product is to some apperently not clear.
maybe there is misunderstanding. or i disagree...
Not sure if i’m getting you correctly pleases let me rephrase so there is no misunderstanding
so we are talking about this cases?:
"If the sec N is not bonded to PE the common mode impedance is close to Infinite"
What do you mean by "the frame". the PE ground of the connected device?
1.) If in this case If "N out" and PE would come in contact nothing would relay happen, right?
2.) If "L out" and PE would come in contact N would become live at mains voltage.
At least here this would be no problem because because plugs are reversabel and N is protected the same way as L
In both ceases an electronic ground fault detection could detect this:
3.) if L out and N out would come in contact the fuse would blow
But in "normal operation" the user could touch L out or N out would only get a small shook because because "N is not bonded the zero sequence Z is infinite"
so no (Low impedance) return part = no (high) current.
And in this case a electronic ground fault detection could trip.
View attachment 198959
But if on the other hand we have secondary side connection between N and PE we have all the same "problems" as with an normal NT-system
And every RCD in fromt of the transformer
would not trip:
View attachment 198960
An isolation transformer like this can’t trip any RCD in front of! so how/why would it be "saver" without an second RCD on the transformer output?!