Looks almost agricultural, though perhaps the rest of it is  a bit tidy for that, and at least power does not come in through the open window. It is quite hard to see what exactly was upgraded, or why one of the 3 fuse carriers is on a different board - perhaps they did not bring enough tail with them and ran out of reel. I agree it could have been better. Surprised the customer did not complain.

M.

My guess was that the original supply was 2-wire, DP fused (via those cotton covered tails that emerge out of the wall just below the window cill) - there was space for a new N block next the the existing pair of fuseholders, but the 3rd fuseholder had to go elsewhere. The red (rather than brown/grey/black) tape on one of the new tails and the amount of dust on top of everything including the new cut-out fuse makes me think it might have been that way for quite a while before the photo was taken.

   - Andy.

Or split-phase?