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some questions on TT

Discussion in 'Electrics UK' started by oldspark, 13 Mar 2007.

  1. oldspark

    oldspark

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    Hi: on a TT system what Ze would you use to base a circuit design on.

    Where it says on the EIC Electrode resistance is that a standard test for Ze or is it the actual resistance of the rod.



    If putting 2 ring mains through the same hole in Joists there are 4 cables and 2 circuits do you rate it as 2 circuits for Cfs

    finally if half your circuit lenth is pulled through joists and half in plaster ie downstairs sockets is it C or what do you reakon

    Cheers
    W J
     
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  3. securespark

    securespark

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    The maximum laid down in the OSG?

    I would measure Ze after rod installation.

    2 circuits.

    A C?

    You mean installation method?

    I would say that was Method 1.
     
  4. comms

    comms

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    Take a reading for Ze.
    Use efli meter and test Ze this can be used as electrode resistance (Ra).
    Same circuit but count as 4 cables.
    C ?
     
  5. comms

    comms

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    Beat me to it securespark.
     
  6. securespark

    securespark

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    What are these strange letters of which you speak?

    I'm not familiar with them... :oops:

    Send secure back to the classroom...
     
  7. comms

    comms

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    If your on about the C ...I havent got a clue, I thought the same as you he was after installation method & yep I'd go with 1.
     
  8. oldspark

    oldspark

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    Sorry..... C is on the cert for PVC cables in non metallic trunking
    OS
     
  9. davy_owen_88

    davy_owen_88

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    Could you clarify what the options are. On the forms I have it would be A as there is no conduit involved but C on these forms stands for PVC cables in non-metallic conduit (not trunking...). Is that what you meant?

    Davy
     
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  11. RF Lighting

    RF Lighting

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  12. oldspark

    oldspark

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    Sorry for confusing you all. got most of the answers apart from the installation one, as I said if half the lenth of your circuit is pulled through joists and half is drawn into pvc conduit and then plastered what is the correct installation method to record on the cert.
    know what I'm after now??

    Os
     
  13. RF Lighting

    RF Lighting

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    Go for the worst case scenario, so it would be listed as wiring type 'C'
     
  14. davy_owen_88

    davy_owen_88

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    You didn't mention the conduit before :p In that case put it as C for the same reason as RF.
     
  15. oldspark

    oldspark

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    Cheers: sometimes you need to clarify.

    Os :)
     
  16. ricicle

    ricicle

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    Where the bloody hell did those codes come from? :confused:
     
  17. davy_owen_88

    davy_owen_88

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    They are on the NIC electrical installation cert.
     
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