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Discuss Conduit back boxes 16mm knockouts in the Electrical Tools and Products area at ElectrciansForums.co.uk.

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  1. SSE
    Offline

    SSE Regular EF Member

    Don't suppose anybody knows where I can source some 2 gang metal back boxes that are compatible with the old steel conduit systems? Basically need to change a 1 gang to a 2 gang but local wholesalers can't seem to locate anything. The old conduit is about 16mm diameter so knockouts need to fit this.
     
  2. davesparks
    Offline

    davesparks Trusted Advisor

    Location:
    guildford
    That'll be 5/8" conduit at a guess.
    You'll have to get a little bit creative I suspect, is the conduit the cpc?
     
  3. happydundee
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    happydundee Regular EF Member

    Location:
    Dundee
    Cone cutter?
     
  4. spinlondon
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    spinlondon Trusted Advisor

    Location:
    Harlow Essex
    Conduit adapted to make it 20mm.
     
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  5. 7029 dave
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    7029 dave Trusted Advisor

    Location:
    bedfordshire
    I have 2 left , had them for over 30 years.
     
  6. SSE
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    SSE Regular EF Member

    Conduit is the cpc yeah.

    ??

    There's really not much hope of adapting it, to get under the floor is a no go as she's put down laminated flooring over hatch!! There's no play in the conduit either, must be saddled underneath.

    Boxes? If so would you be willing to sell them?
     
  7. 7029 dave
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    7029 dave Trusted Advisor

    Location:
    bedfordshire
    No they are conduit adapters, imperial to metric, like couplers. Not boxes of them just 2.
     
  8. davesparks
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    davesparks Trusted Advisor

    Location:
    guildford
    You've got to maintain a good connection then. How does the box connect to the conduit currently? Is it the old old cast iron box or is it bush and coupler onto a more modern style box?
    Your only option may be to mount a twin surface box over the front of it.
     
  9. davesparks
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    davesparks Trusted Advisor

    Location:
    guildford
    Are they 3/4" or 5/8" (I think unless it was 1/2")?
    The 5/8" adaptors are like hens teeth these days, wholesalers only keep 3/4" and 1"
     
  10. 7029 dave
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    7029 dave Trusted Advisor

    Location:
    bedfordshire
    [h=1]Lewden PD1452A 3/4" Male x 20mm Female Conduit Adaptor Galv. Steel[/h][h=3]Part Number: LEWPD1452A[/h]
     
  11. 7029 dave
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    7029 dave Trusted Advisor

    Location:
    bedfordshire
    They might be 5/8 don't know Dave had them for years, yeah just posted the 3/4 and they don't look like them.
     
  12. SSE
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    SSE Regular EF Member

    Thanks anyway.

    It's a more modern style box attached by bush & coupler, would still say it's about 20 years old at least though.
     
  13. davesparks
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    davesparks Trusted Advisor

    Location:
    guildford
    then make a suitably sized hole in the new box and fit it in the same way!
     
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  14. Aindowsimon
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    Aindowsimon Regular EF Member

    Location:
    Caernarfon
    Last edited: Jan 8, 2016
  15. Flanders
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    Flanders Regular EF Member

    Location:
    Tamworth
    As above use a conversion socket or use a metal clad surface back box (as it has not got knock outs in the back) if the hole is deep enough of course and drill out 16mm or cone cutter as suggested to get the exact size, You may struggle to drill out a normal metal back box due to the knock outs and you need a good connection for the earth .
     
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