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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...

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...