What is the yellow wire for on a fan?
What is the yellow wire for on a fan? Blue and Yellow Electrical Wires Yellow wires are used as switch legs to ceiling fans, structural lights, and outlets paired with light switches, while blue wires are usually used as travelers for three-or-four-way switches. How do 3-wire fans work? In a 3-wire fan, first two wires are the power supply wires of the fan. The third wire, comes directly from the output of the built-in 'Hall Sensor' chip generates output pulses during the fan rotation. With the help of this third wire, a monitoring circuit can 'see' the rotation. Which is...