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Discuss Sy cable question in the Electrical Forum area at ElectriciansForums.co.uk.

  1. nathansinar

    nathansinar EF Member

    Location:
    Uk
    Hi guys new to the forum and will introduce myself shortly :p

    I have attached an image of a spur i have taken as you can see from the attached image

    I am doing a trainee maintenance engineer role and just wanted some info on the below.

    1.) when using sy cable do you have to earth the sheeth? i have had various reponses saying it is good practice but you can get away with using the cpc inside the cable and that alone?

    2.) in the image i have posted becuase the sheeth hasnt been used an earth from the the spur to what ever it is feeding, does an earth need adding from the back of the spur plate to actual spur box as it could become live?? is it a reg that this needs to be done?

    Thanks for help!

    Nathan

    20161121_102753.jpg
     
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  3. telectrix

    telectrix Appreciated Member Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    SY cable should not be used for that purpose. in the pic shown, what would happen if the strands of that metallic screen shorted out to a Live terminal in the accessory. at best it's a bodge. at worst dangerous.
     
  4. nathansinar

    nathansinar EF Member

    Location:
    Uk
    Thanks for the reply it was something i did earlier this week i showed a sparky who said it isnt compulsory to earth the sheeth

    I just wanted some proper feedback to the questions i rasied

    Thanks
    Nathan
     
  5. nathansinar

    nathansinar EF Member

    Location:
    Uk
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  7. westward10

    westward10 Electrician's Arms

    Top Poster Of Month

    Location:
    Northamptonshire
    You will have difficulty finding a worded statement from an official source whether to earth the braid or not.
     
  8. nathansinar

    nathansinar EF Member

    Location:
    Uk
    But as regards to the questions i asked is their any proper awnser? i was quite pleased with what i did
     
  9. telectrix

    telectrix Appreciated Member Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    IMO< the braid should be earthed, but i still frown on SY cable being used instead of SWA . also any of those black insulated conductors that carry line voltages should be sleeved brown and any neutrals sleeved blue.
     
  10. nathansinar

    nathansinar EF Member

    Location:
    Uk
    Im only stating what a proper sparky said sy is adequte to use in this scenario?? and im just curious to see what the regs actually state to the 2 questions i posted
     
  11. Jamchiv01

    Jamchiv01 Electrical Installer

    Location:
    Swindon, Wiltshire
    Are you allowed to use those glands to terminate SY? I was always taught to use these:

    [​IMG]
     
  12. drzsta

    drzsta Regular EF Member

    Location:
    S.Wales
    I have seen plenty of instances where SY has been used such as you have shown but it does amuse me that if you are not going to use the appropriate glands and earth the braid, why bother using it at all?
     
    Last edited: Nov 27, 2016
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  13. telectrix

    telectrix Appreciated Member Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    them's the correct glands for SY cable. braid is earthed and the cable is secured in the gland.
     
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  14. Risteard

    Risteard Electrician's Arms

    Location:
    Derry, Ireland
    Business Name:
    Walsh Electrical Services
    Of course the correct SY glands should be used.

    Strictly speaking BS7671 does not recognise the use of SY cable (or CY or YY) and it normally should only be used for controls. These cables are to VDE standards and there is no appropriate British Standard for them.
     
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  15. telectrix

    telectrix Appreciated Member Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    and the braid is NOT A BLOODY SHEATH.
     
    Jamchiv01, Risteard and drzsta like this.
  16. nathansinar

    nathansinar EF Member

    Location:
    Uk
    Im just stating what a proper sparky has told me... the regs dont state that they have to be glanded like that? i agree earthing the sheeth is better but its not compulsory? and in the image shown does an earth need to be run from the back of spur plate to the actually box??

    Thanks
     
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  18. Jamchiv01

    Jamchiv01 Electrical Installer

    Location:
    Swindon, Wiltshire
    In answer to question 2:

    The backbox doesn't need to be earthed as you have 2 fixed lugs that the faceplate screws into. However its always good practice to run an earth strapper from the FCU to the backbox.

    Personally, I Connect the braid to earth but not to be used as an earth, as it can't handle the fault current
    A internal conductor should be used for this.
     
  19. Jamchiv01

    Jamchiv01 Electrical Installer

    Location:
    Swindon, Wiltshire
    I meant the plastic glands he is using ;)
     
  20. nathansinar

    nathansinar EF Member

    Location:
    Uk
    Thanks for the feedback i completely agree with what your saying i am only stating that ive been told you can use plastic glands and you dont always have earth the metal braid i agree its better but the im sure the regs dont state its a must do???
     
  21. nathansinar

    nathansinar EF Member

    Location:
    Uk
    And the image i have posted doesnt break any regs
     
  22. Wilko

    Wilko Gorillas are Great Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
  23. nathansinar

    nathansinar EF Member

    Location:
    Uk
    Hi
    sorry cant open the link for some reason what is your point?
    from the image i have attached their is nothing wrong with it i agree yes many will say to earth the braid but all i wish to know is

    is it compulsory? and becuase i havent done so does an earth need running from the spur face plate to the actual fcu?

    thanks
     
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