We have just got our new electric double oven and thought we could wire up as the same as last one to the mains with RCD trip with a cooker socket so as to turn off to the right of oven, but at the back of the oven, other than the mains wiring part, there are 3 other small wires coming from the back bottom of oven one red, one green and a yellow & one black we have no idea what these are for as we did not have them on the other oven. Could anyone tell us what these are for and how they should be wired Would be very grateful as we have just had part of the house re-wired and a new consumer unit installed and don't want any more expense if we can help it.