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The IFD makes sense on pad-mounts because sometimes it’s difficult to tell if the fault is in the transformer or the cable.
Some of our linemen close in on bayonet fuses on a pad-mount when trying to re-energize it, even though there is no fault close rating. We had a close call recently where a lineman almost got hurt doing that. The IFD would prevent this.
The real operational advantage of using IFDs is that they remove the faulted transformers from the time consuming (return to service or replace) decision-making process.