+18 Light Switch Wiring Colors 2023. Web the light switch has three wires. The 2011 national electrical code required a neutral in every switch box to accommodate new devices like motion sensors, occupancy.
The ground wires splice together and bond to the switch and the box. ( ground wires are not shown.) if the line carrying power comes into the light box first, the circuit must still be wired so the switch interrupts the black line. Find out more in our wiring colours guide.
