Whilst I had a couple of floorboards up in my kitchen, I noticed that my cooker point is fed by two 2.5mm cables. I traced the cables back (through the garage) to the CU, where it is protected by a 30A fuse. I took the cover off the cooker point (after switching the power off of course) and there's no other cables to or from the socket except the 6mm cable to the fan oven itself, which is rated at 4.3KW. So, it has it's own ring circuit. Is this ok ? Or do I need to get it replaced ?