Of relevance here is just exactly when sockets were first manufactured in NZ. My uneducated guess is mid 1960's. Or was it earlier than that ?
Prior to NZ manufactured sockets we must have imported them right ? So could that be why the BS sockets were used ?
Which leads me to the question:
How old would a sparky be today that would have installed these sockets back in the day ? ?
Trumpy you mentioned that steel conduit makes ring circuits impractical, but aren't steel conduit ring circuits in use in the UK ?
