OP
sjm
Re: Protection for cables suppling Consumer Unit, due to distance greater than 3 Metr
I've just had a similar situation. Asked both DNO and NICEIC about the need for additional protection of tails. The answers I got were definitely isolation (so fit a type S (time delayed) RCD) however, unless you're reducing the CCC of the tails, you can rely on the service head fuse for overcurrent protection. If I were you I would consider using standard tails inside of flexible conduit for the run in the cavity. Tails are th only cables allowed to run in the cavity but you should protect them from possible future cavity insulation. Also fixing the conduit could help to stop bridging of the cavity.
I've just had a similar situation. Asked both DNO and NICEIC about the need for additional protection of tails. The answers I got were definitely isolation (so fit a type S (time delayed) RCD) however, unless you're reducing the CCC of the tails, you can rely on the service head fuse for overcurrent protection. If I were you I would consider using standard tails inside of flexible conduit for the run in the cavity. Tails are th only cables allowed to run in the cavity but you should protect them from possible future cavity insulation. Also fixing the conduit could help to stop bridging of the cavity.
