Before you attempt to fix a faulty light switch, make sure you understand the basics of light switch wiring.

Switches controlling line-to-neutral loads must have a neutral conductor installed at a switch serving bathrooms, hallways, stairways, or rooms suitable for human habitation or occupancy, as defined ...

Article 404 of the NEC applies to switches of all types, although the Code doesn’t include a specific definition for a switch. However, six types of switches are defined in Art. 100, which gives us a ...