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Orange Alu Split Con

Martyn
Hi All, 


As per the title I need a 25m ish length of 25mm Orange Alu split con, cant seem to get it from the cable suppliers unless I order to be manufactured with crazy minimum order quantities.


Cant use standard Split con as it’s PVC and I need LSF for an escape route, cable forming part of a BNO replacing a degraded cotton service.


It’s only manufactured in 25 & 35mm apparently, could use either but prefer 25mm.


Anyone with a short length?


Cheers


Martyn
  • 0
    I too have always understood, that a building network operator is just that, the operator of the pre-meter network in a building. Of course after any up front landlord metering, then it is a different game for that part of the system, but the BNO does not get an electricity bill for the energy consumed, because that is not part of the pre-meter building network, they are not a consumer. They may be the same legal entity that do get a bill for energy consumed by corridor lights, and fire alarms and so on, but that will be after a meter.

    As such, the ESQCR is not prohibiting CNE in a building network.

    What does limit this, and quite sensibly in my opinion,  is the house rules of the DNOs who provide the main supply and do not want diverted to see neutral currents between the plumbing in flat one and 2 dependent on the load in flat 3, which is the sort of odd issue you can get with multiple PME supplies.Except that most if not all of the DNOs now require that new building networks are to BS7671 or they will not connect. Like the 3m tails and double fusing  it is not a BS7671 issue per-se.
  • 0

    AJJewsbury:


     


    This cable is BS 7870, split concentric, a distribution (DNO) cable. This is used in a "wiring regulations" environment, if it is not recognised in the regs it must be detailed as a "deviation."



    I'd suggest that BS 7671 doesn't have a list of acceptable cable types - although it does (perhaps just for the convenience of the reader) list and provide data for some common types. I think all the cables listed in BS 7671 are for LV use - yet BS 7671 has a much wider scope these days - from SELV door bells to 12V electrics in caravans - yet bell wire isn't listed nor are automotive cables (usually to ISO 6722).


    The fundamental requirement is for all items to comply with an appropriate BS or HD, or in the absence of such a standard to an international standard or appropriate standard of another country. If a cable meets any of those, there's no deviation.


    Of course a cable needs to be suitable for its intended purpose - and just complying with some random BS is no guarantee of that.


      - Andy.

     




    I've quoted your post, just to say that it more or less matches the information on Electrical Safety First site
    https://www.electricalsafetyfirst.org.uk/professional-resources/wiring-regulations/new-rewired-and-similar-installations/ 


    Question Q1.130. Note, that most of the Q&A in this section are out of date and refer to 17th edition...

    I can quote the answer, but not the question which is basically "does split con to BS 4553 or BS 7870 have to be noted as a deviation from BS 7671?"




    No.  Appendix 1 includes only those standards which are included in BS 7671 and Appendix 4 is informative not normative.    



    Split concentric cable in the LV range complying with either one of two British Standards - BS 4553 and BS 7870 - may be selected, if appropriate to the intended use, without infringing the requirements of BS 7671.      



    Split concentric thermoplastic insulated and sheathed cable is listed in Table F4 of IET Guidance Note 1, Selection and Erection as one of the types of cable that can be used for fixed wiring.



    Split concentric cables can be used in consumers' premises, provided they comply with the relevant cable standard and are installed in accordance with the requirements of BS 7671.  Some types of terminal and clamping unit are unsuitable for the multiple neutral conductors of split concentric cable.  Consequently, installers must take account of instructions for terminations provided by the manufacturer of the distribution board / consumer unit.  



    Regulation number(s):



    • 133.1.1

    • 510.3

    • 511.1






     

  • 0
    "split concentric cables can be used on consumers premises"


    "but a building network, by definition, isn't a consumers installation"


    "it doesn't  (to me) seem to fit the definition of "consumer" More likely its just a type of "distributor"


    I have been watching this fourth court Brexit fiasco, on tv tonight, seeing these QCs arguing, oh yes it is, oh no it isn't. I don't know which is more entertaining, this forum or the Supreme Court.


    Regards, UKPN


  • 0

    "split concentric cables can be used on consumers premises"


    "but a building network, by definition, isn't a consumers installation"


    "it doesn't  (to me) seem to fit the definition of "consumer" More likely its just a type of "distributor"


    I have been watching this fourth court Brexit fiasco, on tv tonight, seeing these QCs arguing, oh yes it is, oh no it isn't. I don't know which is more entertaining, this forum or the Supreme Court.


    Regards, UKPN



    Ah, but I put it to you m'Lud that if BS 7671 permits something in a consumer's installation it therefore ipso facto also permits it in a distribution situation where that is equally covered by BS 7671 - BS 7671 not distinguishing itself between the two.


    The significance of the distinguishment of consumer and non-DNO distribution system applies only with reference to the ESQCR (hence on the use of combined neutral and earth conductors).


       Council (for the awkward squad) rests.


       - Andy.

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