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Troubleshooting and identifying electrical problems in new and old houses and offering possible wiring solutions

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Close-up photo of the electrical wiring connections on a ceiling hung light fixture.

Why Are My Lights Flickering

A dirty bathroom fan and grille

Bathroom Fan Repair

Three-way switch wiring diagram with the LINE and the LOAD inside separate switch boxes. LINE power is delivered to the first switch by using a two conductor cable with a bare or green equipment grounding conductor. The LINE wire is connected to the "Common" terminal on the 3-way switch. A three conductor cable goes from one switch box to the other switch box. From the second switch box a two conductor LOAD cable goes to the light fixture or ceiling fan. The black LOAD wire is connected to the "Common" switch terminal and the two white neutral wires are simply joined together with a wirenut.

Three-Way Switch Wiring Diagrams

Four-way switch wiring diagram depicting the LINE and the LOAD in two separate switch boxes. A two conductor cable with a grounding conductor supply's power from the source to the first three-way switch. From the first switch a three conductor cable goes to the first four-way switch and then to the next four-way switch and ends at the last three-way switch. The white neutral conductor is spliced through each switch box until it is connected to the white LOAD wire in the two conductor cable that goes to the lighting LOAD or ceiling fan. The black LOAD wire terminates on the 3-way switch common screw terminal. Travelers are connected on the 4-ways according to the manufacturers' instructions.

Four-Way Switch Diagrams

Aluminum wire terminated under two screws that have overheated

Aluminum Wiring

A new attic fan with thermostat wired remotely

Attic Fan Replacement

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