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Discuss Armoured cable 16mm or 25mm in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. Cliff C
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    Cliff C New EF Member

    Location:
    Essex
    I am not an electrician. Can anyone help please?

    I have an outbuilding which I am converting into two offices.

    The building is currently served by a 16mm armoured cable running underground from my house, the distance is about 100 metres.

    Potentially the building could have a maximum of the following appliances:-

    2x2kw electric oil filled radiators
    1x1.5kw electric oil filled radiator
    Hand wash 2.5kw
    Electric Kettle 2.5kw
    Saniflo 400 watts
    Vacuum Cleaner 1kw
    4 Fluorescent Lights
    2 Computers
    Total aprox 13kw

    Will the existing 16mm cable be adequate or will I have to have it replaced with a 25mm armoured cable.

    Thank you
     
  2. telectrix
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    telectrix Scouser and Proud of It Respected Member

    Top Poster Of Month

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    bear in mind that not all loads will be in use simultaneously. applying diversity, I'd allow for an aveage load of 8kW. that equates to c. 40A, so as far as current capacity, 16mm will,be fine. volt drop however may be a factor.
     
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  3. Strima
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    Strima Electrician's Arms

    Location:
    St Neots
    For a 40 amp load over that distance you will have a volt drop of 11.2 volts.

    As you have lighting the maximum permitted is 3%, 6.9 volts, even using 25mm you are just over for volt drop.

    Also depending on your current earthing arrangements and protective device type you would be looking at 35mm as a minimum.

    My advice is to employ the services of a local electrician to design and install this for you, a few figures and a bit of SWAG on the internet is no substitute for a full site visit and survey.
     
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  4. telectrix
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    telectrix Scouser and Proud of It Respected Member

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    Location:
    cheshire/staffordshire
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    Telectrix
    i could not be arsed to work out the VD as books are in van. however, for wtat it would cost to replace the 16mm cable versus exceeding the 3% for lighting, I'd fit LED lights which are happy with a slightly reduced voltage and sod it. at the end if the day, it's only a shed, not a hospital operating theatre. tin hat ready.
     
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  5. Spoon
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    Spoon Forum Mentor

    Location:
    Lancashire
    With your current 16mm cable, you can have a 25A breaker.
     
  6. telectrix
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    telectrix Scouser and Proud of It Respected Member

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    and what purpose would that serve apart from OP wearing ot his shoes going backwards and forwards to reset???????
     
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  7. Spoon
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    Spoon Forum Mentor

    Location:
    Lancashire
    Following on from this mate. If he is to reduce the items going into the shed then the max breaker he can have is 25A.. :kissingheart::kissingheart:
     
  8. Pete999
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    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Will that be a 3 phase or Single phase supply?
     
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  9. Cliff C
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    Cliff C New EF Member

    Location:
    Essex
    Single phase.
     
  10. telectrix
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    telectrix Scouser and Proud of It Respected Member

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    Location:
    cheshire/staffordshire
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    Telectrix
    i'm at a loss to see why he should fit a 25A breaker protecting a 16mm cable.
     
  11. Spoon
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    Spoon Forum Mentor

    Location:
    Lancashire
    Voltage drop.
    Any higher than 25A and the voltage drop would exceed 3%
     
  12. Archy Styrigg
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    Archy Styrigg Forum Mentor

    Location:
    Manchester
    Sorry, couldn't resist :D:D:D:D
     
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  13. bill01803
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    bill01803 Regular EF Member

    Location:
    Devon
    I make just over 20A max
     
  14. Spoon
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    Spoon Forum Mentor

    Location:
    Lancashire
    I'll show you mine if you show me yours...
     
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  15. Archy Styrigg
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    Archy Styrigg Forum Mentor

    Location:
    Manchester
    You're obviously in possession of warm clothing.
    I get 23.91 Amperes with just the heaters on full balls.
     
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