Christian McArdle wrote:

Mine is certainly much lower, despite living in an urban area. I can't
remember the figure, but it is less than 2kA.

Mine's very similar at about 0.16 ohm, or 1.5 kA. These seem to be very
typical figures.

Not that you are allowed to rely on it, in case of upgrading in the
supply somewhere.

You are allowed to rely on the attenuation of the PSCC due to the
impedance of your service cable. The idea is to assume that the fault
level on the main distributor cable in the street is 16 kA at 0.55 PF at
all points (since in principle they could drop a new transformer in at
any point) and then calculate the reduction due to adding the impedance
of the length of service cable between the street cable and your supply
intake.

16 kA at 0.55 PF corresponds to a source impedance of 8.25 + j12.53
milliohm, to which add about 1.4 + j0.06 milliohm per metre of service
cable (for the usual 25 mm^2 Cu or 35 mm^2 Al cable). So a 10 m long
service will give a PSCC of 9.3 kA at 0.86 PF, an so on. (These numbers
are for single-phase supplies, of course.)

--
Andy