Just prior to Part P becoming active, I updated my 1960s fuse box to a split-load MCB consumer unit. I was happy that the existing wiring was still serviceable, so decided to simply route it to the new consumer unit, and then add additional cabling as required for new circuits. However, due to length restrictions on the original cables (including the meter tails), it was not possible to get all of them to reach to the appropriate positions in the new consumer unit. I did not want to splice on additional lengths (at least not for 6mm and larger cables), so the fix I adopted was to re-arrange the layout of the consumer box such that the Incomer was to the right of the split-load RCD. In other words, looking at the face of the consumer unit, the split load RCD is on the left hand side, and the Incomer is approximately in the middle. I obviously also re-arranged and re-connected all the manufacturer-supplied interconnecting cables within the consumer box to suit. A friend I mentioned this to recently said that he thought it was unnacceptable, as it was a "non standard" configuration. That led me to check again in BS 7671 (16th Edition) and I can see nothing in there that prohibits my layout. Any views?
CRB