Ground faults are the most common type of fault mostly due to probability. It is more likely to have one phase fault than two or three phases fault at the same time (unless there is something like grounding jumpers, back hoe, crane etc. involved.

Here is this week’s question:

If only one fuse blows during a ground fault, do you/clients replace:
-Only the blown fuse
-All three fuses
-We don’t use fuses