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Originally Posted by Mike
This is making sense now (thanks) so does J/B = Joint box. Is the cooker outlet the socket box on the wall ?
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A cooker outlet usually consists of a 30 amp double-pole switch at high level and a connection unit lower down. Some cooker switch units have a socket outlet on them also (a socket outlet and a large switch marker Cooker). Have you got anything that resembles this? Or have you got a normal socket outlet?
Whether this is the JB or not depends how it was done. Somewhere there will be a joint where the 6.0mm2 cable is joined to a 2.5mm2 cable. It may well be a proper Joint Box.
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What is this..........Some one has retrofitted an extension to the high ampage fuse in your fuse box.
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Your cooker circuit is protected with a 30 amp fuse of circuit breaker. This is too large for a 2.5mm2 cable, so if you are running a standard socket outlet off this circuit, and assuming that the joint is okay (i.e. done in a proper safe manner), then the fuse or circuit breaker for this circuit needs reducing to 15 amp (16 amp for an MCB)
Thanks again[/QUOTE]