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Discuss Voltage drop taken to extremes in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. TaffyDuck
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    TaffyDuck Electrician's Arms

    Just been asked to go and check out a new agricultural barn wired up by a builder. The barn is 350m from the house ( where they have fed it from a socket in the living room) and they have fed it with 1.5mm two core SWA." because its only a socket and a couple of lights".
     
  2. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

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    no problem. fit a 110 socket and step up transformer. and some 110v site lights on a string.
     
  3. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

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    top of me 'ed without looking up 13A would just about give a VD of 110V, so ideal for the odd 110V power tools.
     
  4. Mark_Burgess
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    Mark_Burgess Electrician's Arms

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    Did you measure the VD, I'd like to know how accurate the book figure is to the real thing.
     
  5. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

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    the book gives a VD of 130v at 13A, so i was close. like to know a real life figure. of course he could always DUCK out of this one
     
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  6. TaffyDuck
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    TaffyDuck Electrician's Arms

    Well i only had my little fluke T100 on me, so no accurate reading, well below 200V though and I wasnt going to trudge quarter of a mile back down a hillside to get the megger but tel is about right. will get a proper reading at the end of the week but I make it, on paper a VD of 140V!!!!!!

    0.031 x 13 x 350
     
    Last edited: Feb 27, 2012
  7. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

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    looks like 25mm will be needed as minimum. that will give around 6V VD at 10A.
     
  8. TaffyDuck
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    TaffyDuck Electrician's Arms

    I guessed at that onsite, 25mm 3 core x 350m = BIG MONEY and the will have to bury it again lol
     
  9. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

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    be cheaper to use a genny.
     
  10. TaffyDuck
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    TaffyDuck Electrician's Arms

    absolutely right, either way not my problem thank god. Whats 3c 25mm SWA at the moment £5 a meter at least I would think. Thats £1750.....ouch
     
    Last edited: Feb 27, 2012
  11. Dunc
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    Dunc Guest

    Just for giggles I'd like to see someone try making that off in to the back of a FCU! :p
     
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  12. TaffyDuck
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    TaffyDuck Electrician's Arms

    lol, very true. Havent even added a bit for 3 x armoured resin joints, they will add a fair bit of VD to the system
     
  13. JD6400
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    JD6400 Trusted Advisor

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    Now that connection in the back of the living room socket will be worth a photo ! :grin:

    (I must improve the speed of my typing , been beaten to it yet again !)
     
    Last edited: Feb 27, 2012
  14. SPARTYKUS
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    SPARTYKUS Trusted Advisor

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    Shropshire
    Can you get 200mm DG surface patressses
     
  15. HandySparks
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    HandySparks Trusted Advisor

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    Neish Electrical Services
    Still, you could always leave the existing cable in as an independent lighting supply. You can fit up to 145W and stay within the 3% VD!

    Edit: You might have to put it on a 3A breaker to meet the Zs though.
     
    Last edited: Feb 27, 2012
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