I need guidance on a recurring issue we face in our projects:

In accordance with BS7671, we advise installing consumer protective devices if the tails exceed 3 meters in length. This is because the Distribution Network Operator (DNO) cannot guarantee fault protection for cables over this length.

My question is whether to opt for an uplifted agreed connection, which would entail additional cost for the customer but ensure discrimination between DNO and consumer equipment. Alternatively, should we recommend installing both with the same rating switch-fused isolator and hope for the operation of consumers equipment?

While I can address LV network overloads downstream using electronic devices and as a main switch, direct fault protection on the tails could trigger either device.

Your insights on the most effective approach would be greatly appreciated.