I think we discussed it here. It was published around November 2021 but retracted mere weeks afterwards. To be sure, you’d have to consult the latest version of SANS10142-1-2, which of course is not free to the public.
As I understood it at the time, they want a kind of fireman’s switch.
There will be a connection point somewhere on the outside wall of the house. Usually a box that has been painted over a bajilion times over the years, with two/four screws or a cabinet with one of those square-drive latches, revealing a simple cavity where the wire conductors pass through, and in some cases (TN-C-S installations) the local earth rod is also connected and bonded to neutral. You could probably trace the cable back from this point to the perimeter.
We also had a discussion in the past about the safety of having your electricity switch reachable by just anyone. In my town, there is a criminal element known as the “roof rats” (there may be multiple “teams” with the same MO too). They turn off your power outside the house, wait for the alarm battery to run dead, and then break in through the roof. So you would probably need to have this switch in a box as well, alarm the box or some similar arrangement.
Anyway, I hope that helps.