I just purchased on old loft. I opened a four panel box (I want to swap out some of the switches for dimmers) and discovered the following:
B/W/R B/W/R B/W/R B/W
B/W/R
So four sets of wires coming in from the top of the box (three sets of Black/White/Red and one set of Black/White) and one set of wires coming in from the bottom of the box (Black/White/Red). Assume I number each wire as follows:
B1/W1/R1 B2/W2/R2 B3/W3/R3 B4/W4
B5/W5/R5
B1, B2, B3, R3 and B5 are the hot wires.
All of the wires are hooked up to the same fuse (the one that controls the ceiling lights), except for R3. R3 is hooked up to the fuse that controls a plug near the box, and is tied together with B4 and B5.
Why are R3, B4 and B5 all tied together? What is the purpose of this?
Thanks.