![]() Note: if this method were used in a long hallway where both switches were downstairs and presumably the neutral is not borrowed from another circuit (DON’T PRESUME THIS) then this safety issue would not exist. If you are not sure ISOLATE ALL LIGHTING CIRCUITS BEFORE WORKING ON ANY OF THEM. If you see this method used in your home ISOLATE ALL LIGHTING CIRCUITS BEFORE WORKING ON ANY OF THEM. The live is picked up downstairs and there are still live conductors feeding the switch upstairs and if someone flipped the downstairs switch in this diagram that live feed would extend all the way to the lamp too (you’re fried baby!!). The first reason this is BAD is on safety grounds say we are working on the light upstairs, so we turn off the upstairs lighting circuit thinking we are safe. 3 way light switch using a two wire controlįig 2: Two way swtiching with 2 wire control (DON’T DO THIS).3 way light switching (new cable colours).2 way switch (3 wire system, old cable colours).2 way light switch (3 wire system, new harmonised cable colours).Old multi-point radial lighting diagram using junction boxes.Multi-point radial lighting circuit (old cable colours). ![]() Multi-point radial lighting circuit (new cable colours).Basic multi-point radial lighting circuit.New lighting circuit cable colours (harmonised).Old lighting circuit cable colours (unharmonised).
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