It is designed for three phase mainly, coloured as below:
2 core : | Red / Black | |or| Brown / Blue |
3 core : | Red / Yellow / Blue | |or| Brown / Black / Grey |
4 core : | Red / Yellow / Blue / Black | |or| Brown / Black / Grey / Blue |
You can get SWA in Brown / Blue / Green&Yellow, but it is VERY expensive. You can also get a 5 core SWA with Brown / Black / Grey / Blue / Green&Yellow.