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Mains cable without an Earth

Discussion in 'Cables & Switches' started by Boogie Badman, Jul 25, 2005.

  1. Boogie Badman

    Boogie Badman
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    I have just noticed that my Marantz DVD player and Amp do not have an earth pin on the IEC connector. I opened the plug and can confirm there are just the live an neutral wires. I wanted to know if:
    1 - What effect this would have on the equipment (if any)?
    2 - Would this cause a hum in my subwoofer?
    3 - Would it still be worth me upgrading my mains cables?
    4 - Am i being silly?

    Thanks.
     
  2. eviljohn2

    eviljohn2
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    Most modern consumer electrical equipment has the power supply double-boxed so doesn't need an earth. This is represented on the rear panel by a concentric square symbol usually by the power receptacle. Anything that has the figure-8 type power inlet also doesn't have an earth - it's really nothing to worry about.

    Professional audio or very high power equipment usually does have an earth (my Behringer Feedback Destroyer for example) and it certainly is necessary to a 3-core lead connected to earth in these cases.

    Having floating ground levels (ie. no earth connection) should help prevent hum in a sub as these are caused when there is a small difference in the earth value used by the 2 devices whilst if neither or only 1 is connected to earth then it will be common to both.

    You're not being silly and I don't think that there is enough knowledge with regards to power supplies and cabling when it comes to consumer hifi equipment. You'll have to decide for yourself if you think upgrading them is worthwhile but if you're bored have a read of this thread which is fairly comprehensive. :)
     
  3. Boogie Badman

    Boogie Badman
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    Thanks - very interesting.
     
  4. guli

    guli
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    which thread is it eviljohn?

    thanks
     
  5. eviljohn2

    eviljohn2
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    Just click on the underlined "this" in my post which is a hyperlink. :)
     

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