For what kind / scale of connection? What I'm familiar with is, for 480V
3ph systems, you have impedance in terms of short circuit current, so that your facility and equipment must use fuses capable of clearing 100kA or less, or 200kA, or even more. The impedance is largely determined by how big a transformer you have at the "drop", and somewhat by the HV wiring to the site. HV should usually be a small part, as there will be other customers on a given run (usually) and the resistance must be low enough to supply them as well.
I think inductive reactance is something like 10% of the resistance, pretty low at line frequency.
For low voltages, my experience is that 240V (semi- to non-industrial) is rarely over 10kA fault (again, depends on transformers, wiring and facilities), and residential 120V, under 2kA.
As for specifics, you'd have to ask someone else... as others have said, power co. is probably as good as any..?
Tim