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Type of wire.

Discussion in 'Electrics UK' started by uncletone, 30 Jun 2021.

  1. uncletone

    uncletone

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    Hi,
    I've been swapping some light switches and light fittings recently and being an older house, late 70's I think.
    I found the lighting circuit runs off this wire, this being the live to all the switches, with an accompanying sheathed (red or black depending if its from the switch to light or the light to another light) and earth running along inside it.
    The sockets run off twin and earth. So i'm wondering if this was the normal setup back in the day and what would you call this type of wiring with the live being separate.
    Seems weird to me not to just use twin and earth for the lot unless 1.5mm didn't exist.
    Thanks
     

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  3. EFLImpudence

    EFLImpudence

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    It's just single insulated and sheathed (plus earth) for when only one wire is required from point to point - switch to switch and/or switch to light as you have realised.

    Nothing normal nor odd.
     
  4. winston1

    winston1

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    1.5mm would be oversized if it did exist. 1.0mm is the size for lighting. What you have is probably 3/029 imperial cable.
     
  5. JohnW2

    JohnW2

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    In "late 70s" ?
     
  6. winston1

    winston1

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    I did think about that and decided that “he thinks” late 70’s was mistaken. The cable certainly looks like imperial to me.
     
  7. JohnW2

    JohnW2

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    It does, not the least because it is certainly stranded. However, I may be wrong but IU had a feeling that there was a brief period during which stranded metric T+E was available?

    ... and I suppose I should have added that 3/029" was closer to 1.5mm² than to 1.0mm² - so I wonder what you thought about the use of that for lighting circuits?
     
  8. AndyPRK

    AndyPRK

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    It's confusing.

    The cable certainly looks like imperial to me. (stranded)
    But the green earth sleeve is more 70's

    Old cable stock installed in early half of 70's I guess
     
  9. bernardgreen

    bernardgreen

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    The type of wire / cable used in a house re-wiring project may not be the correct / latest / modern type of cable.

    A house built in the 1990's or later could have been wired or re-wired using old stock cables from the 1960's.

    1.0 mm² is adequate for lighting supplied by a 6 Amp MCB. 1.5 mm² is also acceptable for lighting
     
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  11. AndyPRK

    AndyPRK

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    Not really oversized. The Irish seam to insist upon it.
     
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  12. winston1

    winston1

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    Well that says it all
     
  13. winston1

    winston1

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    Never come across stranded metric cable in those sizes.

    3/029 works out at 1.28mm2 so midway between the two sizes. 1/044 [=0.98mm2] was also used for lighting but as far as I know singles not T&E.
     
  14. Astra99

    Astra99

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    1/.044 was definitely available in twin rubber sheathed (no earth!!!!!). My parents 1938-built house had it on the lighting circuit, but the 2-pin sockets (also on the lighting circuit) were wired in 3/.029
     
  15. john4703

    john4703

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    Using old cable can be confusing. A couple of months ago I rewired the lighting circuits in a boiler room, a simple job, one switch, four light fittings. Nothing seemed strange until I realised the cable was red and black 1.0mm T&E. There is a nice sign on the consumer unit warning people that there is a mix of colours of cable so I left my work as it was. I just wonder how long that drum of cable had been lurking at the back of my workshop. Will someone be confused to find red and black cable with yellow/green earth sheathing?
     
  16. securespark

    securespark

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    Green was prohibited from 1978, when it was superseded by green/ yellow.
     
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  17. Harry Bloomfield

    Harry Bloomfield

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    3.029 singles, plus 3.029 single with earth. 1970's -ish. The Appleby back box is a type intended to be a sunk in the wall type, not intenged for a surface mounting.
     
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