Originally Posted by
Sideshow
It's fine if you're sticking to the extension cord socket at the shed end (ie don't wire it in as a feed to a power point or other fixed wiring).
As for the RCD, if you have RCD's in your switchboard already - providing protection to the power circuit in the laundry then you'll be fine. If not, then as suggested get yourself a plug-in RCD and plug the extension cord into that. Should be ok.
Not sure about the conduit, why not run the cord out whenever you use it? Seems like a lot of trouble for a temporary set-up. Guess you could use the cord as a draw wire for the permanent wiring later on.