Hi im doing an install first fix on an extremely large bungalow which has undergone a major reroof , the whole roof was taken down to accomodate a much larger loft space which in turn is going to be master bathroom with 3 bedrooms with ensuite in every room . What im planning on doing is running a 16mm t&e from the mains one end to feed a submain to the other half its about 20 metres long it will be clipped direct with very little contact with insulation .Would you feed this off the main board with a 63amp mcb rcd protected or fit a 80 amp main sw direct into henley blocks the supply is tncs 100 amp . The whole bungalow is approx 30 metres long so was hoping to run this in to cut down on cable lengths and amount of circuits back to the incoming supply im hoping one or two of you have come across a similar so hoping for some ideas ive only just started the job the plasterer not due for at least another 2 weeks.