Where do you connect shield when there is no Earth?

Discussion in 'General Electronics Chat' started by redbird_is, May 6, 2010.

  1. redbird_is

    Thread Starter Member

    Jan 13, 2008
    11
    0
    Hi everyone,

    I understand exposed metal parts are usually connected to Earth in a 3 prong AC applications. What happens when Earth is removed?

    The exposed metal I'm thinking of is a shielded RJ45 jack.

    My first guess would be to connect through a capacitor to low voltage circuit ground. But perhaps this isn't a great idea, especially if high voltage ground is connected to low voltage ground through a capacitor as well.

    Any thoughts on this? Much appreciated.
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,535
    On a 2 wire AC setup one side is neutral, which is also ground in that setup.

    The capacitor is probably a good idea.
     
  3. Ghar

    Active Member

    Mar 8, 2010
    655
    72
    Earth ground isn't useful for shielding, the connection you want is to chassis.
    Shielding is like an extension of the enclosure around your cables.
     
  4. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    The jack shield side / terminal may already be tied to the internal chassis ground of the equipment in question. You haven't explained exactly what your concern is, the nature of the equipment and/or why you want to complete the earth path connection.
     
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