Does anybody know how to roughly calculate the Short Circuit Arc Flash energy given things like voltage, fault loop impedance and fuse rating?

Guidelines on this or rules of thumb? Looked at a few papers. I understand how it works but I have got to admit I'm not making much headway applying the formulas.

In particular what would happen from a single phase fault, say 240V, 0.3 ohm fault loop impedance but protected by a 100A service fuse. Not really sure of the curve of this fuse anyway.