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Resistance of earth 1.5 + 2.5

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  • 19-03-2019 10:31pm
    #1
    jasushaw
    Registered Users Posts: 151 ✭✭


    Hi

    What is the resistance of 10m of 2.5 t+e
    ,10m of 1.5 T+e, 10m 6 sq t+e and
    10m 16sq t+e

    Thanks


Comments

  • Options
    #2
    2011
    Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,532 Mod ✭✭✭✭2011


    jasushaw wrote: »
    Hi

    What is the resistance of 10m of 2.5 t+e
    ,10m of 1.5 T+e, 10m 6 sq t+e and
    10m 16sq t+e

    Thanks

    A twin and earth cable has 3 cores within it (live, neutral & earth).
    Which cores do you want the resistance of within each twin and earth cable?


  • Options
    #3
    jasushaw
    Registered Users Posts: 151 ✭✭jasushaw


    2011 wrote: »
    A twin and earth cable has 3 cores within it (live, neutral & earth).
    Which cores do you want the resistance of within each twin and earth cable?

    Ye just looking to find what the earth resistance is?


  • Options
    #4
    meercat
    Registered Users Posts: 4,726 ✭✭✭meercat


    2011 wrote: »
    A twin and earth cable has 3 cores within it (live, neutral & earth).
    Which cores do you want the resistance of within each twin and earth cable?

    The reading will be the same between all conductors if it’s the new t&e cable

    Page 6 of this newsletter gives typical readings for 1.5 and 2.5

    https://safeelectric.ie/contractors/wp-content/uploads/sites/2/2018/09/Sept-2018-Newsletter.pdf


  • Options
    #5
    2011
    Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,532 Mod ✭✭✭✭2011


    meercat wrote: »
    The reading will be the same between all conductors if it’s the new t&e cable

    Page 6 of this newsletter gives typical readings for 1.5 and 2.5

    https://safeelectric.ie/contractors/wp-content/uploads/sites/2/2018/09/Sept-2018-Newsletter.pdf

    I understand that the conductors are now the same size I was not clear if the OP wanted to know the resistance of phase + neutral, phase + earth or just phase for each 10m length. As it happens it would seem that the OP just requires the resistance of the earth conductor.


    I also don’t know if the OP is referring to the new T & E or the older type (which has the reduced earth).


  • Options
    #6
    2011
    Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,532 Mod ✭✭✭✭2011


    Approximate values:
    • 1.5 mm sq. copper cable is 12.1 mΩ per meter
    • 2.5 mm sq. copper cable is 7.41 mΩ per meter
    • 6 mm sq. copper cable is 4.61 mΩ per meter
    • 10 mm sq. copper cable is 1.83 mΩ per meter
    • 16 mm sq. copper cable is 1.15 mΩ per meter

    So multiply by 10 to get the resistance for 10m.


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