I have found while looking under my floorboards that my cooker cicuit has been joined using one of the round junction boxes, is this safe or should i run a new cable from the CU
what size cable is being used and what is the current rating of the joint box? Also, what is the power/current rating of the cooker? Do the joints in the box look like they've over heated? Turn off the juice before checking!!!
Yes, if it's a BIG cable then the junction box probably is not of the correct rating. Probably better to run one complete new length of cable whilst you have your boards up anyhow. Just to be on the safe side for the future.