Type N is actually the only one of these that's a global standard, IEC 60906-1. That's the reason why South Africa adopted it when deciding what to use as a rep

Type N is actually the only one of these that's a global standard, IEC 60906-1. That's the reason why South Africa adopted it when deciding what to use as a replacement for Type M. There was a bit of a push some years ago to encourage countries to adopt IEC 60906-1 but there's obviously huge inertia against that sort of move.