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Cable thoughts?

Martyn
Hi All, 


So I am looking at a job to install a cable inside a commercial building from an existing 100A 3ph service head to a 9 way TP Ryefield; circa 20M


The client has aggreed with the DNO that it will be a BNO installation, there will be no meters until after the Ryefield fuses.


Choices would seem to be,


External trench around the building or run internally (client prefered)


Stright Con

Split Con

SWA

Singles in trunking (nightmare)


Thoughts? 


I wont be deciding, it’s not going on my tickets! 


Thanks


Martyn


Jesus this new forum malarkey is crap on mobile, it seems to break all the text integration rules.

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  • 0

    Martynduerden:

    . . . If as you suggest it will need to meet BS7671, How would Concentric meet BS7671 with CNE after the head? . . . 


    . . . Why do you contend Split Con does not meet BS7671, there are millions of meters of it installed in to flats from Ryefields? . . . 


    . . . Why would I need armouring? . . . 




    Four core concentric has four cores with an overall screen/armour. With four cores you can use the screen/armour as the earth - it can be easier to get round corners than SWA sometimes. It must be SNE after the head. 


    Split con does not comply with BS7671 as the neutral surrounds 1/3 of its diameter, a conductor that BS7671 refers to as a “live conductor”. It could be used in places where T&E is acceptable. 


    You need armouring partly to protect it from damage, and it is also the easiest approved way to protect it against abstraction. 


    Regards,


    Alan. 

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  • 0

    Martynduerden:

    . . . If as you suggest it will need to meet BS7671, How would Concentric meet BS7671 with CNE after the head? . . . 


    . . . Why do you contend Split Con does not meet BS7671, there are millions of meters of it installed in to flats from Ryefields? . . . 


    . . . Why would I need armouring? . . . 




    Four core concentric has four cores with an overall screen/armour. With four cores you can use the screen/armour as the earth - it can be easier to get round corners than SWA sometimes. It must be SNE after the head. 


    Split con does not comply with BS7671 as the neutral surrounds 1/3 of its diameter, a conductor that BS7671 refers to as a “live conductor”. It could be used in places where T&E is acceptable. 


    You need armouring partly to protect it from damage, and it is also the easiest approved way to protect it against abstraction. 


    Regards,


    Alan. 

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