Interesting post M. I would counter with the thought that the majority of us with a dedicated CU and multiple supplies for our hifi have heard the sonic benefits. Improved Resistance and impedance are clearly beneficial.
The “grounding” issue is another matter and I have read a lot of conflicting opinion on whether a dedicated one for our hifi actually acts as a drain for unwanted “noise” or not be it from our home or other properties on the same grid if our supply is PME.
I envy you being on a TT supply and my ideal final home will be in a rural area with a close by underground stream. If so I will look to have the largest possible copper plate buried close to it for an obvious purpose!
If nothing else it means you are in control of the grounding and isolated from your neighbours, interference and noise can come from multiple sources of course, including those outside your control or influence. I’m also not pushing this to levels of experimentation that others are, I’m just providing personal perspective, in others situations a better setup may well apply of course.
I’ve gone for a setup that is simple and with high levels of protection for the whole installation fundamentally, I would say that my systems run entirely silently, at my old house which was in a town centre, near a train station and had a different earthing arrangement, I did get transformer hum, even with all the separate wiring and CU setup as others typically lean towards.
I think it’s the latter – I’ve never dug in to this, it’s just something which came up many years ago when discussing wiring et al (as these folklore matters go ).
Having fitted my new CU c.20 years ago (scary!), I asked him to post-fit a 2nd bus bar (only a bar metal plate). He bought one and then found it wouldn’t fit
Many thanks to everyone who helped me plan my hifi circuit installation.
In the end I put in 2 radials:
Lapp Olflex Classic 110 CY 10mm sq to Furutech (G) single socket. This cable has a tinned copper braid and PVC outer sheath.
And Belden 83803 (12 AWG) cable to an MS HD Power (G) duplex socket. This cable has (7×20) tinned copper conductors, Teflon insulation, 100% Beldfoil shield with 85% tinned copper braid and a Teflon jacket.
I can switch either of these radials off at the Hagar hifi CU in the room if I want to.
The thin Belden cable had a circuit impedance of 0.08 Ohms and the fat Lapp cable measured 0.04 Ohms.
The Earth loop impedance of the Belden radial was 0.07 Ohms, of the Lapp cable was 0.06 Ohms, and the house ring main was O.41 Ohms.
It may be yet more weeks before I set up the hifi because we have to decide whether to install bookshelves on the rear wall, and I do not want any dust from that work getting into the hifi.
Looks like a good job Jim.
How have you configured the shields on the cables ???
Remember they need to be an earth/grounded conduit & not part of the earth circuit path as such.
To do this the industry stnd is to connect the shield to earth only at the ‘power in’ end & leave the other end open (unconnected)
All three shields in the 2 cables are connected to the earth bar in the hifi CU - and are not connected at the socket ends.
Is that what you’re suggesting is best practice?
I think the 3 shields therefore join the same earth path as the 2 earth connectors in the 2 cables (and the unused connector in the Lapp cable, which is connected to the hifi CU earth bar at the CU end and not at the socket end).
I would plug something into the circuits now to start the long burn in process. This will make initial switch on of your kit sound even better on the new mains.
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