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Crimping bootlace ferrules for RCBO neutrals

Discussion in 'Electrics UK' started by f0rmula, 29 Apr 2013.

  1. f0rmula

    f0rmula

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    I want to cut, and put bootlace ferrules on, 8 RCBO neutrals. They're way too long at the moment. See below.


    I can find ferrules for a sensible price, but anything to crimp them seems to be £100+. Shortening these cables is worth a few quid to me, but I only need to crimp 8 ferrules, so I can't justify spending that kind of money. Are the £100+ crimps the only way to crimp bootlace ferrules? This price looks promising :) http://tinyurl.com/c7y6uvo

    Also, if I can find a suitable way of crimping, what size ferrules would I be after? They seem to be specified in thickness and diameter, right?

    http://www.cablecrimper.co.uk/product-info.php?ccs-pid243.html

    Cheers
     
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  3. Iggifer

    Iggifer

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    • Thanks Thanks x 1
  4. Monkeh

    Monkeh

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  5. f0rmula

    f0rmula

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    Cheers. They look about 4mm.

    Well, they're not bootlaced, but they are pressed into a square tip, with what looks like a touch of solder (?) to keep the strands together. Threads on here suggest you can't just chop them as the terminals aren't designed to take stranded cable. I'd much rather not spend £40 if there's no need, but from reading on here it looks like I have to bootlace them.
     
  6. Chri5

    Chri5

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    I can't see the point, and the tails from the makers don bother so why should you.

    Cut back each, making sure there's slack to rejig the config (should you ever need), strip, tin with some solder and terminate.
     
  7. EFLImpudence

    EFLImpudence

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    You must not 'tin'.

    Just fit the smallest uninsulated ferrule and 'squash' to prevent it falling off.

    This will prevent the terminal screw tearing the strands and will 'crimp' when you tighten the screew.
     
  8. bernardgreen

    bernardgreen

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    NOT a good idea, solder is soft and deforms under the pressure of the screw. As the solder deforms the contact pressure reduces leading to the development a high resistance joint, overheating and failure follow.

    The square ends of the tails are formed under very high pressure with the strands effectively cold welded together into a solid mass.
     
  9. Lectrician

    Lectrician

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    Ferrules like these do not have a crimp tool - You place the ferrule over the cable and stick it in your terminal. Doing the terminal up "crimps" the ferrule.
     
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  11. ricicle

    ricicle

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    If you're talking about the insulated ones Lec, I have a tool for crimping them...
     
  12. Spark123

    Spark123

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  13. f0rmula

    f0rmula

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    Picked up these crimps and the 4mm ferrules. Perfect job. Highly recommend those crimps. They feel really solid, and only £24.

    My cable strippers say they're 6mm, but I could _just_ about squeeze them into the 4mm ferrules, minus a couple of hairs. Very snug, but a great contact. :)

    Thanks again.
     
  14. f0rmula

    f0rmula

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    And the results...

     
  15. Monkeh

    Monkeh

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    Much nicer.

    You should note that the diameter of stranded cable can't be used as a reliable indicator of CSA. Round strands cannot be packed together without a gap.
     
  16. Iggifer

    Iggifer

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    nicer than the job eaton did on the Neutral tail!
     
  17. ban-all-sheds

    ban-all-sheds

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    But isn't 99% of the improvement down to simply shortening the leads?
     
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