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Your suggestion sounds the best way forward as it is fairly easy and doesn't involve changing cables. Is the type of conduit regulated or can I use corrugated plastic conduit over these cables? I've already got some of this stuff and it's 20mm internal diameter, I brought it for sleeving copper...

If I was to consider insulation free channels for the ring cables what size should they be? If I was going to split the ring into two radials what kind of derating should I use? Previous advise has suggested that running cables inside insulation in the studs I may need to de-rate by up to...

So that appears to leave me up the creek as they say, I need to derate the fuse so that the derated current can never be exceeded, but the law will not allow lower value fuses? That sounds a little silly surely if the fuse is smaller it's safe? If I was to consider up-grading the 4mm cable...

For practical reasons (see other reply to Chri5), I feel that to up-grade might be just too much hassle. The rooms on the ring are really utility rooms, so I am thinking that 20A is probably never going to be a problem, there is heating in the rooms so I shouldn't ever need any electric heaters...

I feel that to try and up-grade cable is probably impractical as I'd likely have to pull the ceilings down (the studs are creating 4 small rooms in a side extension). Unless you mean that I should make cuts and joints so that 4mm is inside the studs only? But then isn't that inserting lots of...

What good would that do? Ib ≤ In ≤ Iz

Thanks for your reply, my lighting circuits are 1.5mm & protected with a 6A MCB, the ring main is 2.5mm & has a 32A MCB. The appliances that are fed from the ring main are: a washing m/c, Tumble dryer, a fridge/freezer and a chest freezer. If I understand your comments correctly using a...

I want to fit sound insulation into the cavity in some studwalls in my property, and was planning to use mineral wool bats (e.g. from wickes). My query is that since these bats also have thermal insulation properties, what should I do to ensure that the cables remain safe and do not gradually...