Indeed - I obviously hadn't seen your previous post until after I finished typing mine.
Kind Regards, John.
Pvc Armoured cable run(single phase)
- Thread starter huggy30cycling
- Start date
Kind Regards, John.
Hi there guys ,yes the run was measured using the Pedometer??(I think that how its spelled),But i'm grateful to you for your remarks,I knew inside that it was a no go-er for this work,I will pass on this info to the people cocerned ,that they will have to negotiate with the elec/company to bring the O/H line right up to the house,and from hence run the pvc armour into the and instal a service head,thanks again.
Well no.
The isolator at the supply end could be in the 10mm² before it gets joined to the ginormous SWA....
And terminate the fock off great SWA into what?
Easier to use a fock off great isolator / sw-fuse at either end.
**** = F0ck (yep, I typed F0ck).
Mmm.
My thinking was this:
Yes, whatever, you're going to need an FOBB of some sort to terminate the ginormous SWA into - either a busbar chamber or an isolator/switch fuse.
But...
Any switch or switchfuse designed to feed ginormous SWA is surely going to be designed to handle humongous currents? (I love these technical terms
)
In this case 185mm² would be used not because it's a 400A load but because of volt-drop, but who's going to be making switches that you can terminate 185mm² into without them being able to handle 400A?
And that sort of switchgear has got to be pretty expensive - markedly more than a simple box with some sturdy copper bars downstream of what would only need to be the sort of switch you find as an incomer in a domestic CU. Or a 63A MCB.
I guess compared to £10K worth of cable it's trivial though.
My thinking was this:
Yes, whatever, you're going to need an FOBB of some sort to terminate the ginormous SWA into - either a busbar chamber or an isolator/switch fuse.
But...
Any switch or switchfuse designed to feed ginormous SWA is surely going to be designed to handle humongous currents? (I love these technical terms
)In this case 185mm² would be used not because it's a 400A load but because of volt-drop, but who's going to be making switches that you can terminate 185mm² into without them being able to handle 400A?
And that sort of switchgear has got to be pretty expensive - markedly more than a simple box with some sturdy copper bars downstream of what would only need to be the sort of switch you find as an incomer in a domestic CU. Or a 63A MCB.
I guess compared to £10K worth of cable it's trivial though.
HV is the way to go over that distance, unless they can turn the LV wick up so that VD isn't an issue.
But then where would the meter be? Would the supplier want to pay for the soil heating?
I'd second the suggestion to up the voltage somehow - I suggest either a 2-phase or split-phase supply transformed at the other end, or even at both ends, depending how the economies work out with the cost of the transformers.
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