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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:

    TT earth islanding for the building or the rooms involved  is the nearest you will get to that.


    You can do it but you need to have an RCD up front, perhaps 100mA slow acting, and then from then onwards you then ignore the company earth, and use the local electrode. The two earth zones must not meet, so plastic radiator pipes or boxing in if parts of the building are to one earthing system and the rest to another.




    The two earth zones may require separation by the DNO. It may not be achievable in a built up area, and might depend on the extent of the PME and arrangement of the distribution and other metallic services in the area.

    DNOs aren't always keen on two different earthing arrangements within a building either.


    An earthing approach to BS EN 50310 would, I believe, be far superior in most cases, and a TN system earthing arrangement is usually better.






    To add any value at all in terms of noise ingress you need to have some mains filtering on the circuits or perhaps just before the whole CU feeding the quiet zone.

    We tend to specify things like  these  on RF chambers, where we mount them on / stuck through  the chamber wall, with the dirty side out, clean side inwards  for receiver tests, and the other way round for transmitter or pulse power testing, but that may be overkill and you probably need to keep an eye on the earth leakage the filters cause.




    All single-phase supplies through a split-phase transformer would make a big improvement as well, but this would be costly. Just pulling a phase and neutral off the three-phase not always best for EMC

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  • 0

    mapj1:

    TT earth islanding for the building or the rooms involved  is the nearest you will get to that.


    You can do it but you need to have an RCD up front, perhaps 100mA slow acting, and then from then onwards you then ignore the company earth, and use the local electrode. The two earth zones must not meet, so plastic radiator pipes or boxing in if parts of the building are to one earthing system and the rest to another.




    The two earth zones may require separation by the DNO. It may not be achievable in a built up area, and might depend on the extent of the PME and arrangement of the distribution and other metallic services in the area.

    DNOs aren't always keen on two different earthing arrangements within a building either.


    An earthing approach to BS EN 50310 would, I believe, be far superior in most cases, and a TN system earthing arrangement is usually better.






    To add any value at all in terms of noise ingress you need to have some mains filtering on the circuits or perhaps just before the whole CU feeding the quiet zone.

    We tend to specify things like  these  on RF chambers, where we mount them on / stuck through  the chamber wall, with the dirty side out, clean side inwards  for receiver tests, and the other way round for transmitter or pulse power testing, but that may be overkill and you probably need to keep an eye on the earth leakage the filters cause.




    All single-phase supplies through a split-phase transformer would make a big improvement as well, but this would be costly. Just pulling a phase and neutral off the three-phase not always best for EMC

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