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Use Of Cable Ferrules

Former Community Member
Former Community Member
Morning gentlepeople of the IET forum.


I'm just throwing this out there to try a get some opinions on cable ferrules and if people use them and where.

From my understanding, they are mainly used during panel builds, IT equipment and even on flexible cables. However, I recently went to a domestic property to perform an EICR and every cable connected to the RCBOs (ignore the earth fly lead which already comes crimped from the manufacturers) had ferrules clamped on the ends.

Clamped on every cable with the exception of the cooker and garage supply, which from memory i believe were both 6mm cables.

in hindsight, i should have taken a picture and shared this, but i didnt, so I failed you all!

To be fair, the electrician who did this, I can see committed to being very neat and tidy. One of the nicest installs i have seen in a while.


I personally have never done this with T+E so just found the ferrule thing a bit strange and wondered if it's something others do, and maybe this could or should be a future reg!?? Pro's and Con's i suppose. 

My thinking was that it does protect the copper cable inside the ferrule, allowing for a better connection too i suppose!?
Parents
  • Ferrules are mainly intended for use on Class 5 (flexible) and Class 6 (extra-flexible) cables to:
    1. Help reduce the risk of "dropping strands" or accidental shorting between terminals (one reason for their use in control panels, especially "hot swap", as Class 5 conductors are often used in this type of equipment).

    • Help prevent damage to strands in maintenance, testing and fault-finding (another reason for their use in control panels)

    • "Convert" the Class 5 or Class 6 stranded conductor into a "solid" conductor for terminals that are unsuitable for Class 5 and Class 6 conductors.


    Whilst I can see that ferrules may be of use for stranded conductors (Class 2), and these are not precluded, I don't believe any manufacturer of ferrules expresses their suitability for solid conductors with less than 7 strands.



Reply
  • Ferrules are mainly intended for use on Class 5 (flexible) and Class 6 (extra-flexible) cables to:
    1. Help reduce the risk of "dropping strands" or accidental shorting between terminals (one reason for their use in control panels, especially "hot swap", as Class 5 conductors are often used in this type of equipment).

    • Help prevent damage to strands in maintenance, testing and fault-finding (another reason for their use in control panels)

    • "Convert" the Class 5 or Class 6 stranded conductor into a "solid" conductor for terminals that are unsuitable for Class 5 and Class 6 conductors.


    Whilst I can see that ferrules may be of use for stranded conductors (Class 2), and these are not precluded, I don't believe any manufacturer of ferrules expresses their suitability for solid conductors with less than 7 strands.



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