Twisted pair cable/ Shielded twisted pair

Discussion in 'General Electronics Chat' started by Lundwall_Paul, Jan 18, 2012.

  1. Lundwall_Paul

    Thread Starter Member

    Oct 18, 2011
    220
    19
    Anyone have references to Twisted pair cable/ Shielded twisted pair? I am looking for general guide lines as to when twisted pairs should be used, and how shields should be used. I have used RS-485 shielded twisted pairs just don’t understand why one end of the shield is grounded but not the other end. I suspect it is to prevent ground loops, but I see in other applications where the shield is tied at both ends.
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,016
    3,235
    For low frequency shielding (such as for 50-60Hz) you can connect the shield at one end to minimize ground loops. For high frequency (RF) shielding the shield should be connected at both ends.
     
  3. Lundwall_Paul

    Thread Starter Member

    Oct 18, 2011
    220
    19
    That much I knew. I was looking for a more scientific answer, theory and rules.
     
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