Open Delta Fusing 1

[buzzp]

We have an open delta transformer configuration used for metering purposes. This is an old installation so only two legs of the delta are fused with the middle leg tied to ground and no fuse.
Is it still standard practice to fuse only the two outter legs and not the third (grounded) leg? I can't picture a scenario where the two fuses will not see the current (and therefore open the fuses). With motors, this set-up is not allowed any more (overloads). I was wondering if the same can be said for an open delta transformer configuration?

 

[busbar]

 
Very happy to help, buzz. This message board is a very fitting use of the internet.