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I am extending a ring main, with 2.5 mm cables. Is it best to drill two small holes in a joist, or one big one? By small I mean 11mm, big I guess about 16mm. I know that holes have to be three diameters apart, and I'm putting them in the middle of the joists, which are about 7 inches...

What are the restrictions around running ring main 2.5 mm cable next to central heating pipes - copper and plastic. I'm particularly thinking about cables under floors next to heating pipes, and running up inside stud and plasterboard walls. TIA

I am in the process of renovating a lot of my house. The first floor sockets are on a radial circuit, and I am about to replace this with a ring. I used to have an office in a bedroom with four four gangs on a double socket, on a radial spur! in my new office with a ring, I want lots of...