VictorPS
That is true IF the MEN strap is in place at the entry point in Australia (strapped Earth bar to Neutral bar)
I am probably stating the obvious here, but the fact that there is no voltage relative to Earth does not mean it does not carry current. You cannot open the Neutral and expect not to get a shock. The moment you open the neutral there can be line voltage on the neutral side of any appliance that is switched on.
As an aside, the neutral in an office block may carry almost 1.7 times the current that is present in any single phase due to triple N harmonics currents generated by non-linear devices such as SMPS , Fluoros and general sloppy balancing of phasing loads . Early installations (before smps and other computer loads) had a neutral wire that was only as big as the phase wire. I have been in installations where the Neutral Conductor was running quite warm in the cable and switchboards.
I think that modern installations now require a larger diameter Neutral .
The main point here being (use a meter to check before you touch any bare conductor) Especially in dual or triple switched lighting ccts (the convenient ccts where you turn on and off the lights at different switches)
Cheers
RH