I've added a junction box with 3 connection blocks to a lighting cable in the loft in order to add a spur for loft lighting. The cable I've broken into operates the landing light and other on the upstairs floor. I've followed 2 wiring diagrams, both of which have identical layouts, but I can't get the loft light to work. Instead, when I switch it on, the landing light comes on instead. I'm using an intermediate switch (live to L1 & neutral to L3) - is that the problem? Source URL: https://www.electriciansforums.net/thre ... st-1581635
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