Whenever I've done this, I have taken SWA from a switchfuse at the beginning to an isolating switch at the remote end, then tails from the isolator to the DB. It adds a few quid to the cost, but it makes it easy to terminate the SWA properly and you can easily (and reliably) isolate the DB when you need to work on it.Does the switch fuse need to be able to be locked off?