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Discuss 10mm t&e submain cpc in the Electrical Wiring, Theories and Regulations area at ElectrciansForums.co.uk.

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  1. JakeF
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    JakeF New EF Member

    Location:
    Liverpool
    I know there’s the adiabatic equation to work earth size but generally if you install a twin and earth cable for distribution, do you need to worry about the smaller cpc size

    My situation is 20 metre 10mm t and e run and not using it to provide earth bonding. Will the 4mm cpc be adequate. 50A mcb not many circuits to feed.
     
  2. telectrix
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    telectrix Scouser and Proud of It Respected Member

    Top Poster Of Month

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    what's the earthing arrangement?
     
  3. Risteard
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    Risteard Respected Member

    Location:
    Derry, Ireland
    Business Name:
    Walsh Electrical Services
    Can you clarify what you mean by this? Earthing and bonding are completely different things, and "earth bonding" does not exist.
     
  4. JakeF
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    JakeF New EF Member

    Location:
    Liverpool
    Tncs
     
  5. JakeF
    Offline

    JakeF New EF Member

    Location:
    Liverpool
    Will the 4mm in the t and e suffice.

    Won’t be used for water and gas bond
     
  6. Risteard
    Offline

    Risteard Respected Member

    Location:
    Derry, Ireland
    Business Name:
    Walsh Electrical Services
    So it's just being used as a cpc then?

    Apply the adiabatic calculation to verify its adequacy then.
     
    • Optimistic Optimistic x 1
  7. Pete999
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    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Show your calculations Jake.
     
  8. Strima
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    Strima Electrician's Arms

    Location:
    St Neots
    What's the Ze at source of circuit?

    Type/rating of OCPD etc?

    Installation method?
     
  9. davesparks
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    davesparks Forum Mentor

    Location:
    guildford
    Yes you do need to worry about it, whether it be a final or distribution circuit.
     
  10. spinlondon
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    spinlondon Forum Mentor

    Location:
    Harlow Essex
    The term ‘sub main’ suggests a distribution circuit.
     
  11. davesparks
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    davesparks Forum Mentor

    Location:
    guildford
    Yes I saw that, my point was that the same consideration needs to be given to both types of circuit.
     
  12. Taylortwocities
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    Taylortwocities Electrician's Arms

    Location:
    Oxfordshire
    20metre run of 10mm T&E?
    is this an inside or outdoor run?
     
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  13. buzzlightyear
    Offline

    buzzlightyear please let me back in to the prison cell.

    Location:
    star command
    sub mains to and from would be help full .
     
    • Optimistic Optimistic x 2
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