On Wed, 27 Jun 2007 08:32:17 +1000, Franc Zabkar
wrote:

I've just checked the Australian fittings. Our new batten holders have
bakelite collars, but the old ones were metal. There is no continuity
between the collar and any other terminal, including the earth
terminal (which doesn't exist on some fittings).

- Franc Zabkar

That is true Frank, but often the ring is earthed which effectively
connects it to the neutral pin of the socket.

Easiest way is to make a lead which plugs into the socket, and then
you have access to the test leads in a more controllable situation
than probing into the socket itself.

Peter Dettmann