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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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    Where there are obvious flow and return currents, such as PSU + and - to a particular load, these are better under the same shield.

    So with that in mind, keep L and N to the same load together, not forming a big loop one turn mains hum generator.

    If magnetic pick up is the concern, twisted pair shielded is better than random bundle shielded, as the pick-up in alternate twists cancels.

    Generally fixed wiring in metal conduit is pretty much the best, but cannot be made leak proof.

    SY and CY may raise an eyebrow in wiring circles but are good enough for keeping trouble out of the wiring in EMP labs.


    Is there a shielding spec - how many dB better than a bare cable you need to be, or perhaps  an immunity spec such as no more than so many mV induced when illuminated by an external field of X volts per meter over a certain frequency range  ?


    ' be shielded ' is rather vague - how long is a piece of string. Some design authority input may be needed.

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  • 0
    Where there are obvious flow and return currents, such as PSU + and - to a particular load, these are better under the same shield.

    So with that in mind, keep L and N to the same load together, not forming a big loop one turn mains hum generator.

    If magnetic pick up is the concern, twisted pair shielded is better than random bundle shielded, as the pick-up in alternate twists cancels.

    Generally fixed wiring in metal conduit is pretty much the best, but cannot be made leak proof.

    SY and CY may raise an eyebrow in wiring circles but are good enough for keeping trouble out of the wiring in EMP labs.


    Is there a shielding spec - how many dB better than a bare cable you need to be, or perhaps  an immunity spec such as no more than so many mV induced when illuminated by an external field of X volts per meter over a certain frequency range  ?


    ' be shielded ' is rather vague - how long is a piece of string. Some design authority input may be needed.

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