Originally Posted by David48atTD
It's the cycles that is important.
Sorry Dave, but that's not the case for the question at hand. Hertz has nothing to do with if an appliance is earthed or not. Klondyke was right in the first post.
Originally Posted by Neverna
in reality the voltage is still at, or very close to, 240 volts
Makes little difference, 230 V or 240 V to the OP (or to the appliance). Klondyke was right.
Earthing is providing an alternative path for the current IF the casing of the appliance is conductive AND if the circuit is compromised. It's a safety feature.