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I plan to drill 3 x 20 mm holes (lined with plastic conduit) through the external wall of my house to run cable for: outside wall light, socket, low voltage garden lighting. How should I position these new holes to minimise structural weakening of the wall? Should they be arranged vertically...

Thanks very much for the replies. I'll give it a go this weekend. From what I can see it looks like I need to unclip the MCB at the bottom, then slide it off the finger of the busbar, while at the same time removing it from the DIN(?) rail, all in one action I suppose? Reverse procedure to...

My upstairs lighting circuit is wired in 1mm^2 twin and earth cable, and protected by a 10A MCB (Wylex type B). This past spring we had new (more) loft insulation fitted, and now the lighting circuit cable is under the insulation through much of its length, increasing the chance of...