My point is that wouldn't the fault current be higher due to the reduced resistance to ground given the conductivity of the fence?
Yet in this case the current level was below the pickup of the fuse. A sustained vegetation ground fault should have a greater chance at reducing the current level...
Recently we had an incident involving a falling branch on an LV power line which energised a colour-bond fence.
Our (protection) fuses are generally set to operate above specific load currents in order to facilitate overload tripping. Faults involving vegetation are often high resistive earth...