Results 1 to 5 of 5

Thread: Reading are to high

  1. #1
    New Member
    Join Date
    Aug 2015
    Location
    Kempton Park
    Posts
    2
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Reading are to high

    Please can someone help me we did a revamp of an old house but when we did the tests the PSC was 5.67KA and the Earth Loop was 4.78 oum. What can be wrong and how can we fix it

  2. #2
    Full Member
    Join Date
    Sep 2015
    Location
    port elizabeth
    Posts
    26
    Thanks
    0
    Thanked 1 Time in 1 Post
    Have you isolated the installation and do the loop impedance test on incoming to see if its a supplier problem?

  3. #3
    Full Member
    Join Date
    Sep 2015
    Location
    port elizabeth
    Posts
    26
    Thanks
    0
    Thanked 1 Time in 1 Post
    What is the earthing system? You could try and add additional earth like the crow foot or just one or two earth spikes to the installation earthing.

  4. #4
    Silver Member
    Join Date
    Sep 2010
    Location
    cape town
    Posts
    297
    Thanks
    3
    Thanked 42 Times in 36 Posts
    how close is the house to the minisub?

  5. #5
    Bronze Member
    Join Date
    Mar 2008
    Posts
    174
    Thanks
    2
    Thanked 36 Times in 30 Posts
    I am assuming you have a TN-S earthing systems if you are getting a high prospective short circuit and and low earth reading. Is it the old style supply cable, metal sheath used as earth. An earth wire kind of wrapped around the metal tape sheath? The earth on that stuff is usually useless after many years. Sometimes you just getting an earth from the old metal conduits (you said was an old house, right?)

    Check with the local supplier if its possible to convert to TN-C-S earthing system. Check with them first to see if there is PEN conductor. A lot of the time when they run new cables to feeder pillars they link Neutral and earth at the feeder pillar.

    Also the nice people from the power company could have done a kak joint on the cables outside the house under the road. They still use the armouring as the earth and have been known not to bother connecting it. Had them dig up the road a few times. They love that.....

    Alternatively, new supply cable from boundary to board as a last resort.

Similar Threads

  1. [Question] Reading of sars efiling documentation
    By ericg@vodamail.co.za in forum Tax Forum
    Replies: 4
    Last Post: 09-Jul-15, 12:26 AM
  2. high loop impedance reading
    By ians in forum Electrical Contracting Industry Forum
    Replies: 3
    Last Post: 20-May-15, 07:00 PM
  3. [Question] KA Reading
    By pes in forum Electrical Contracting Industry Forum
    Replies: 5
    Last Post: 18-Aug-13, 01:30 AM

Did you like this article? Share it with your favourite social network.

Did you like this article? Share it with your favourite social network.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •