Is it a fan oven ? Conventional does it have an integral Grill ?
All of this increases the loading factors. some double fan ovens with Grills need a supply rated at over 25 amps
Its no good asking vague questions about an oven. We need a definite rating. Some appliances have an interlock to stop two elements being used at once bring their maximum rating under 3kw, some dont and can consume up to 7kw at once. The appliance's maximum rating will be printed on its data plate, which is normally behind the oven door on the frame or, more rarely, on the back of the appliance.