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Single Core (Shielded) LV Cabling for Audio Equipment

Adrian B
Hi All


Quick question regarding suitable cabling for LV supplies to Audio equipment.....

I have a client (Sound Studio Designer) who is insisting on the LV power cabling to serve many different types of Audio equipment being shielded.  Firstly, I have never specified anything of the sort previously, normally specifying 6491 or 6242 etc., so is there something out there that is suitable?  Secondly, has anyone had any experience in this type of installation, and if so, what are the thoughts on single core or multi core cabling with shielding?  I personally would have thought that shielded singles would be the preference, but what do I know, I am quite obviously not a specialist in this field.


Any advice/ help would be hugely appreciated as always.


Thanks


Adrian B.
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    mapj1:

    Transformer isolation will be good for low frequency junk, less useful for higher frequencies, RF tends to also be  a problem for audio as well as direct in -band break though, as it intermodulates to create audible responses.

    However any isolation will only be as good as the separation of pre- and post filtered wiring in any case, running them alongside for any length will largely undo the good. Hence shielded walls where it really matters, which is not here.




    If we are looking at how the electrical system deals with harmonics and reception of radiated emissions, a centre-tapped transformer (earth the centre-tap) is much better for single-phase supplies.






    I'm  not aware of any restriction requiring you to use the DNOs earth after the meter,  you can TT one house in a row, or indeed one room in a building, much as you would a garden shed.

    However, if there are shared services these do need some thought, and so does where the TT earth electrode goes needs to be far away from sources of current injection or removal from the terra firma, I suspect we are saying the same thing in different words.




    Well, whilst there are no restrictions per say, the DNO may have a separation requirement. Whilst to-date not often invoked, some of the installation practices employed thus far for EV are making DNOs think again about TT. If the TT is required for a caravan site or marina, the IET recommend 10 m underground separation between anything connected to the TT, and anything connected to PME.

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  • 0

    mapj1:

    Transformer isolation will be good for low frequency junk, less useful for higher frequencies, RF tends to also be  a problem for audio as well as direct in -band break though, as it intermodulates to create audible responses.

    However any isolation will only be as good as the separation of pre- and post filtered wiring in any case, running them alongside for any length will largely undo the good. Hence shielded walls where it really matters, which is not here.




    If we are looking at how the electrical system deals with harmonics and reception of radiated emissions, a centre-tapped transformer (earth the centre-tap) is much better for single-phase supplies.






    I'm  not aware of any restriction requiring you to use the DNOs earth after the meter,  you can TT one house in a row, or indeed one room in a building, much as you would a garden shed.

    However, if there are shared services these do need some thought, and so does where the TT earth electrode goes needs to be far away from sources of current injection or removal from the terra firma, I suspect we are saying the same thing in different words.




    Well, whilst there are no restrictions per say, the DNO may have a separation requirement. Whilst to-date not often invoked, some of the installation practices employed thus far for EV are making DNOs think again about TT. If the TT is required for a caravan site or marina, the IET recommend 10 m underground separation between anything connected to the TT, and anything connected to PME.

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