I guess my understanding of electrical circuits is quite deficient. I installed two pendant lights, from the attic, and have them wired to a new switch, The new switch has the cable from the light closest to it connected to it (the switch), and a another cable connected to it which will supply the power once I get that cable connected, i.e. spliced to, a line in the attic that is a live line. I have a line sensor (Commercial Electric brand, model MS8907H). In the attic, I see 3 lines going down into a column (about 18" x 20" dimensions) next to the kitchen. This column has 3 switches on it. One - the left of 3 switches - is a 2-way/3-way switch turns on/off a chandelier light in a foyer; that light can also be turned on/off with two other switches. The cable I see connected to that switch (in the column) is a round and black. The middle switch is a standard single-function switch which is connected to an outlet [this allows turning a lamp, or other device, plugged into the outlet on/off]. The right switch turns a ceiling light on/off. Let's ignore the left switch mentioned above since it is obviously a special case. My confusion then, regarding the middle and right switch on the column, is that I only see one cable per switch going down into the column. My electrician-deficient brain thinks those switches would require two cables each, one cable supplying power to the switch and one cable supplying power from the switch to the outlet/fixture. So, how the heck can a switch control an outlet or fixture if it only has one cable connected to it? The other part of my confusion is that my electrical sensor (Commercial Electric brand, model MS8907H) detects power present in the lines leading to the outlet and the light fixture when I know the switches are turned off. I have attached a photo of the lines I see going into the column from the attic and a photo of the 3-switch panel on the column. [url]https://photos.google.com/photo/AF1QipNxuvw-wPCrbei7acgt80wx3956Xev1VkHQiW0G[/url] [url]https://photos.google.com/photo/AF1QipMky0HeBH_sR_FuiPergBlX2OCU7nLVDP5rJ_ys[/url]

I have an unfinished basement that has two outside doors. Inside each door there is a switch for the outside lights that only turns on one side of the outside lights. Is there a way to wire so both switches are a 3 way so both switches can turn on all the outside lights instead of just one side? Thanks