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Discuss Old Twin and earth conductors and cpc? in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. elecypwn
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    elecypwn EF Member

    Hello, This is the first time iv came across anything like this and i went to quote this fuseboard for a upgrade yesterday and had a look inside and did all the required testing and inspecting and said id get back to them with a date when i can do the installation but came across one slight snag, the current cable that has been used is Twin&earth but with one difference it has a very shiney but soft AL conductor and CPC, is this installation suitable to be terminated to Brass termination bars/protective devices? if not will there be any 17th edition units that support this type of wiring or will it be sufficient to use a board that has AL termination bars/screws? or is it a rewire job/walk away.

    You can slightly see the colour of the cable on the neutral side and also on the second picture of the earth bar, any advice would be appreciated cheers.


    IMG_0170.jpg IMG_0171.jpg
     
  2. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

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    cheshire/staffordshire
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    Telectrix
    if the cable is in good nick, as long as you are careful, no problem. your terminals in the new CU are plated anyway. i would make the comment on your cert. though, as ali cable is generally deemed to require replacement.
     
  3. elecypwn
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    elecypwn EF Member

    Cheers mate,

    So to clarify its still OK to do works on aslong as its in good condition, and i should note on the EIC that it is ALI cable and should recomend a rewire within - when ever i think is applicable.
     
  4. QSGAZ
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    QSGAZ Guest

    Try and push them for a full re-wire.Ive come across many of these as long as you have plenty of earth sleeving you should be ok, but keep an eye for bonding as sometimes the old installations dont have it.
     
  5. wirepuller
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    wirepuller Trusted Advisor

    Location:
    south uk
    Dont know if you've done any continuity tests on finals and ring finals....but ali is notorious for breaks and poor connections......allow for issues.
     
  6. jase
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    jase Electrician's Arms

    sure its not tinned copper? looks like it's a 1950's/1960's install
     
  7. elecypwn
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    elecypwn EF Member

    It very well could be tinned copper, i was unsure since this is the first time iv came across this type of Twin&earth, i will try scraping it to see if i can expose any copper when i start it, i just wanted to make sure it would still be ok to go ahead an do the work with this type of cable, because of the material it is. But the insulation/continuity tests of finals and RFC came back ok, so i assume it would be ok to continue with the upgrade like tele recommended as long as the wiring is in good condition and done properly, and comment on the cert because of the type of wiring used it should really be re-wired asap?
     
  8. needasparks
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    needasparks Electrician's Arms

    Location:
    Essex
    As above really, doubtfull its ali with pvc sheathing would prob be tinned copper. Only ali i've come across is the old black rubber.
     
  9. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

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    definitely looks like ali. to me, looking at the neutrals twisted in the block.
     
  10. elecypwn
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    elecypwn EF Member

    I rang my ELECSA tech line and the guy said it was common practice to use that type of twin and earth back in the 60s and still satisfactory to have aslong as the current installation is in good nick as you said tele, but ill have a good look at it while im upgrading the board to see if it is ali or tinned copper, Cheers guys thanks for the info!
     
  11. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

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    if it's ali. don't twist the ends when terminating and give them a tug, make sure they're not fractured after terminating. as said, if all test results come in OK< then recommend a 5 yearly inspection schedule.
     
  12. londonlec
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    londonlec Regular EF Member

    Location:
    London
    Dont forget potential asbestos flash pads in that old MEM board.
     
  13. D Skelton
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    D Skelton Fidei Defensor Trusted Advisor

    Location:
    Canada
    Something else to be aware of is that there is a high chance the lighting circuit/s will not have CPC's.
     
  14. wirepuller
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    wirepuller Trusted Advisor

    Location:
    south uk
    Back in the early 70's there was a copper shortage and ali was widely used. Looks the same as old T/E but is larger....2.5 equivalent looks more like todays 4mm. There's a whole estate near me done in the stuff.
     
  15. Dave 85
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    Dave 85 Guest

    Tell em its dangerous and they have to pay 10k for a rewire then go around and cut every wire in every acessory in the house just to make sure they dont turn their dangerous circuits on.....
     
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