I have posted this information before but for the record South African fixed wiring is exactly as described for Australia by Dave.
Flex for single phase is the brown (live), blue (neutral), green/yellow (earth). As for three phase flex, I am not sure.
A note on conduit wiring. Black is always neutral and earth is either green or bare. Red is usually phase but I have seen brown used. For switched feeds and travellers, I have seen used brown, blue, white, yellow and pink.
