Extend new circuit from outhouse into another property with an existing supply, which is bad idea or not allowed?

davezawadi (David Stone):

There were several overlaps in posting there, and I will go a bit further. Alcomax is right, we need simplicity. It sounds to me as if you need to get the 3 phase supply to the main house even if you need a trench which may not be as difficult as you assume. The options are to get the DNO to supply 3 phases to the house in place of the existing single phase (not ruinously expensive if you get someone with a digger to do the trenches) or to run this other cable which you say may be difficult but still only digging and careful threading under the tree roots. The new cable length needs to be considered too, and the new DNO supply may be easier than other options. I assume that the supply cable is underground, if overhead it is quite simple and cheap. You will find that most contractors will give you high prices for this kind of job, and probably suggest a lot of additional works are necessary to do the job at all. Most will run away from the two supplies problem I outlined earlier. I would expect the 10mm cable would run your new laundry fine, with satisfactory volt drop unless very long, in which case it is not the best place to put the laundry! The NICEIC is not the only contractor body, and not in any way any kind of requirement, so you can probably find a local electrician who may well be better and more reasonable to properly help you. Any questions may be asked here for solution from him or you.


Regards

David CEng etc.

Not so easy David, they have the biggest oak tree in the town between the two buildings that is protected by a TPO.

Pre-planning advise has said the council will only allow digging a trench if it is 25 meters under the soil or a semi circle with a circumference of 20 meters to avoid root disturbance. That too with strict limits on vibration created and speed of boring machines!


Cost of project including surveys, specialist equipment and arobrists was around £30k....

davezawadi (David Stone):

There were several overlaps in posting there, and I will go a bit further. Alcomax is right, we need simplicity. It sounds to me as if you need to get the 3 phase supply to the main house even if you need a trench which may not be as difficult as you assume. The options are to get the DNO to supply 3 phases to the house in place of the existing single phase (not ruinously expensive if you get someone with a digger to do the trenches) or to run this other cable which you say may be difficult but still only digging and careful threading under the tree roots. The new cable length needs to be considered too, and the new DNO supply may be easier than other options. I assume that the supply cable is underground, if overhead it is quite simple and cheap. You will find that most contractors will give you high prices for this kind of job, and probably suggest a lot of additional works are necessary to do the job at all. Most will run away from the two supplies problem I outlined earlier. I would expect the 10mm cable would run your new laundry fine, with satisfactory volt drop unless very long, in which case it is not the best place to put the laundry! The NICEIC is not the only contractor body, and not in any way any kind of requirement, so you can probably find a local electrician who may well be better and more reasonable to properly help you. Any questions may be asked here for solution from him or you.


Regards

David CEng etc.

Not so easy David, they have the biggest oak tree in the town between the two buildings that is protected by a TPO.

Pre-planning advise has said the council will only allow digging a trench if it is 25 meters under the soil or a semi circle with a circumference of 20 meters to avoid root disturbance. That too with strict limits on vibration created and speed of boring machines!


Cost of project including surveys, specialist equipment and arobrists was around £30k....