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7 STRAND TAILS V 19 STRAND

John Peckham
I changed a consumer unit  a week ago and for the first time used 19 strand tails instead of 7 strand tails. I have to say they are much easier to use and manipulate in tight spaces. I think they are a much better for terminating in a cage clamp as they fill the space under the cage making more contact than 7 strand.


I purchased them from Tool Station and found they were made by Doncaster cables. A bit more expensive than 7 strand but worth the extra money. 


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    AJJewsbury:

    Ah, but does your local DNO/supplier approve them for use in their supply terminals?

       - Andy.




    Do the terminals themselves (supply end of consumer unit end) support connection of conductors without suitable preparation (e.g. ferrule), re Regulation 526.9.1 ?


    There are 4 classes of conductor currenty in use for installation cables, although there used to be more (hence the numbering):


    Class 1 - solid (although larger csa conductors are obviously not a single solid strand, there may be 5, 7 or more).

    Class 2 - stranded (typically, minimum of 7 strands for all csa)

    Class 5 - flexible (sometimes called finely stranded)

    Class 6 - extra-flexible


    Most fixed wiring terminals are suitable for Class 1 solid, and Class 2 stranded, conductors without preparation, and Class 5 and Class 6 requiring ferrules (the exception being connection units to BS 1363 which are suitable for connection, at least on the outgoing terminals, of Class 5).


    Worth checking.what you have, and what the terminals are designed for.

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  • 0

    AJJewsbury:

    Ah, but does your local DNO/supplier approve them for use in their supply terminals?

       - Andy.




    Do the terminals themselves (supply end of consumer unit end) support connection of conductors without suitable preparation (e.g. ferrule), re Regulation 526.9.1 ?


    There are 4 classes of conductor currenty in use for installation cables, although there used to be more (hence the numbering):


    Class 1 - solid (although larger csa conductors are obviously not a single solid strand, there may be 5, 7 or more).

    Class 2 - stranded (typically, minimum of 7 strands for all csa)

    Class 5 - flexible (sometimes called finely stranded)

    Class 6 - extra-flexible


    Most fixed wiring terminals are suitable for Class 1 solid, and Class 2 stranded, conductors without preparation, and Class 5 and Class 6 requiring ferrules (the exception being connection units to BS 1363 which are suitable for connection, at least on the outgoing terminals, of Class 5).


    Worth checking.what you have, and what the terminals are designed for.

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