IB-02Check for cables and pipes, and get ready to drill safelyRun a detector over your marked points, but don't trust it completely — detectors miss cables that are deep, in metal conduit, or outside the usual safe zones near sockets and switches. Find your stopcock, usually under the kitchen sink, and check it turns before you start. If you have any doubt about what's behind the wall, isolate the circuit at the consumer unit before drilling, and be ready to shut off the water at the stopcock if you hit a pipe.