Irecieved a shock from my wall switch that controlls the dishwasher,stupidly a had a wet hand and bare feet.The circuit is protected by an mcb and a 30milli amp rcd but i still got a shock.i have checked the earth and the operation of the mcb and rcd and they work fine.Why did i still get ba shock,any answers from qualified people.Also the rcd or the mcb did not trip.