diy_master
DIY
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I need to replace an existing fan which has 3 wires and earth. They are red blue yellow. The new fan i have needs switched live, live and neutral. I have a fluke voltage pen so can i just identify which is the switched live cable by putting switch on and seeing if pen bleeps and then turning switch off and seeing it doesnt bleep? Live should be detected by the pen bleeping? Neutral will be the only wire that does not bleep when using the pen?