Articles about wires in junction box
How to Wire a Junction Box: Selecting a Junction Box for Electrical Wiring, The Basics of Electrical Junction Boxes, The number of wires that are allowed in a Junction Box.
Can more than one circuit be run through a single junction box? Junction Box Wiring and Multiple Circuits.
How do I disconnect the electrical wires and leave them in the panel for future use? Disconnecting Unused Electrical Wires, How to Keep Spare Electrical Wiring Safe for Future Use.