if the RCD tripped out as soon as you switched it on at the wall then either the oven is connected wrong or it is faulty ie it has a fault to earth. if the MCB tripped out then then you are pulling to much load for the rating of the circuit breaker and probably the cable too. there is a rating plate on the cooker you need to check how much current the cooker will draw and fit suitable cable and protective device to control the cooker. I suggest you get an electrician to check it out.
mick, March 2010
