3 Way Wall Switch May 28, 2019 Understanding Three. Three-way wall switches are most commonly used to control a light fixture from two locations, such as from both ends of a hallway or stairway. www.thespruce.com Hot Neutral Ground Wire ColorsHome Electrical Wire Size ChartConverting 4 Prong To 3 Prong Dryer Cord1985 Corvette Wiring DiagramExtension Cord Wire Colors4 Wire TrailerInstalling A Digital Thermostat In Home3 Way Switch Doesn T Work Properly