TT, TN-S and TN-CS Earthing Arrangements

Discussion in 'General Electronics Chat' started by E&EE, Jun 25, 2015.

  1. E&EE

    Thread Starter New Member

    Jun 14, 2015
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    Can someone help me how to complete the earthing arrangements, with PME systems and PEN conductors also Line and Neutral conductors for TT, TN-S and TN-C-S.
     
  2. E&EE

    Thread Starter New Member

    Jun 14, 2015
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  3. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,548
    2,373
    Get hold of a copy of the 'Bible' 'Book on Grounding' by E.C. Soares.
    Used by NFPA95 NFPA90 and also used by the Intl. Inst. of Electrical Inspectors.
    I picked up a 'new' copy for $1.00 from AbeBooks clearing house.
    Max.
     
  4. E&EE

    Thread Starter New Member

    Jun 14, 2015
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    Whats the typical earth loop impedance for TT, TN-S and TN-C-S system?

    What protective device for TN-C-S and a TN-S System and why?

     
  5. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,986
    745
    In the UK, Tns is 0.8 ohms, Tncs is 0.35 ohms,TT is upto 200 ohms, protection device is a RCD 30mA trip at 40milli seconds.

    BS7671 has all the regulations
     
    Last edited: Jun 28, 2015
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