im ashamed to say but iv just bought a oven and it comes with a 3 amp plug and when i plug it into the socket the 3 amp plug blows i see extra terminals at top end of oven does it need to be hard wired too if so can it be 2.5 mm or 4mm or 6mm i asumed it was just throught the plug because hob is totally seperate can anyone please help me and tell me how ?