Thanks for your reply.
As I'm in Australia, our 240v plug slightly different with USA one,
we have 3 plugs (as indicated at the following picture)
Now, As far as I know the two tops are the HOT plugs? and the bottom one is the ground?
As most of Australian power board don't exposed their HOTS and GROUND sockets (see example here), I'm not sure where I can attach the anti-static alligator bit to the ground