4mm T/E CPC?

Discussion in 'Electricians' Talk' started by Virtual Voodoo, May 13, 2008.

  1. Virtual Voodoo

    Virtual Voodoo New Member

    Can you get 4mm T/E with a 2.5mm CPC?



    Reason I ask is I may have a job comming up which is a large open plan office which is being devided up in to modular offices add additional sockets are required.

    It's quite large (not measured it yet) and including all the drops from the suspended ceiling in to each office I suspect that the circuit length will soon add up.

    The main board is situated at one end and there is only two spare ways left so I want to avoid running loads of radials if poss and was therefore considering 2 x 4mm Rings but standard 4mm has the same cpc size as 2.5mm so I suspect the max Zs will not greatly improve?
     
  2. Clark Kent

    Clark Kent New Member

    Why not use singles...



    :)
     
  3. Clark Kent

    Clark Kent New Member

    Why not use singles...



    :)



    Or run an additional earth...
     
  4. Clark Kent

    Clark Kent New Member

    It's quite large (not measured it yet) and including
    all the drops from the suspended ceiling in to each
    office I suspect that the circuit length will soon
    add up.



    Forget the singles then...


    :(
     
  5. fooman

    fooman New Member

    i always thought th cpc of 4mm was 2.5 ??? :(
     
  6. sparky Si-Fi

    sparky Si-Fi Screwfix Select

    .......can also be in 1.5

    page 158 OSG (my beat up Blue 'un)
     
  7. sinewave

    sinewave Screwfix Select

    So can you get it with a 2.5mm CPC then cause I don't know either?
     
  8. M107

    M107 New Member

    Live & learn dont you Foo, I thought the same as you :)
     
  9. fooman

    fooman New Member

    i always thought the cpc should be a least 50 percent bigger than the phase and neutral conductors

    altho 16mm does not work like that :(
     
  10. sinewave

    sinewave Screwfix Select

  11. fooman

    fooman New Member

    cpc of 16mm T&E is only 6mm :(
     
  12. M107

    M107 New Member

    i always thought the cpc should be a least 50 percent
    bigger than the phase and neutral conductors

    altho 16mm does not work like that :(

    Dont you mean half the size of L & N conductors?
     
  13. fooman

    fooman New Member

  14. splater-and-duck

    splater-and-duck New Member

    rcd on the ends would solve the Zs prob as the disconnection times would be met. however if its an office then guess computers and earth tripping may be a prob for you and the rcd would be more trouble.
     
  15. Clark Kent

    Clark Kent New Member

  16. Clark Kent

    Clark Kent New Member

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