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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
    Check with your  DNO, but at least round here, they expect (and will only connect a supply if ) the BNO works also comply with BS7671, for anything and everything after the DNO cut-out, so the wring to secondary cutouts and the meters if they are some distance away do end up in SWA, as split concentric, is not really suitable for cables that are routed in the fabric of the building, as the earth is not an over-all armour.  Fine however anywhere that T and E could be routed.Certainly true in flats, not so sure of your situation, but probably. There are plenty of legacy cables of course, but they seem stricter on the new stuff. I'd suggest to call the DNO and clarify before installing something they don't like. There will also be some duplication of bonding to services, if this spits one supply to multiple 'origin'
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  • 0
    Check with your  DNO, but at least round here, they expect (and will only connect a supply if ) the BNO works also comply with BS7671, for anything and everything after the DNO cut-out, so the wring to secondary cutouts and the meters if they are some distance away do end up in SWA, as split concentric, is not really suitable for cables that are routed in the fabric of the building, as the earth is not an over-all armour.  Fine however anywhere that T and E could be routed.Certainly true in flats, not so sure of your situation, but probably. There are plenty of legacy cables of course, but they seem stricter on the new stuff. I'd suggest to call the DNO and clarify before installing something they don't like. There will also be some duplication of bonding to services, if this spits one supply to multiple 'origin'
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