Adding a switch and new lights to a circuit?
The new cable going off to the new switch and lights comes in wo where the feed is, here, the existing switch box.
Black of the new cable connects to black of the feed. Now you cannot put both the feed and the new black under the same screw on the switch so you need to use a pigtail, that is cut a short length of wire to connect to the switch and the other end and the new cable black and the feed black are then connected together.
White of the new cable connects to white of the feed. This part is easy, just join together all the whites.
Black going off to the old lights stays connected to the old switch.
Now this is easier said than done. It is possible you cannot stuff all those wires into the box and also put back the existing switch. You might need to take everything apart and install a bigger box. To meet code you need 18 cubic inches of space inside the box.
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Last edited by AllanJ; 03-07-2010 at 05:16 PM.