Stairwell Light Controlled By Two-Way Switches
Stairwell Light Controlled By Two-Way Switches
This is a wiring diagram for a Stairwell Light Controlled By Two-Way Switches.
Components
- Two-way switches: There are two identical two-way switches, one located at the bottom of the stairs and the other at the top. These switches have two common terminals and two traveler terminals.
- Stairwell light: The light fixture is located somewhere between the two switches. It is represented by a bulb symbol in the diagram.
- Power source: The power source is represented by a line symbol labeled “Phase” on the left side of the diagram.
- Neutral wire: The neutral wire is represented by a line symbol labeled “Neutral” on the left side of the diagram.
How it works
- When either of the two-way switches is turned on, it connects the common terminal to one of the traveler terminals, completing the circuit and supplying power to the light.
- When both switches are in the same position (both on or both off), the traveler terminals are connected together, but not to the common terminal, so the circuit is incomplete and the light is off.
- Because each switch has two possible configurations for its terminals, either switch can turn the light on or off, regardless of the state of the other switch. This is why they are called two-way switches.
Additional Notes and Consideration
- This wiring diagram is for a basic two-way switch setup, which is a common and effective way to control a light from two locations.
- The advantage of this system is that it allows you to turn the light on or off from either end of the stairs, which can be convenient and safe.
- However, it is important to consult with a qualified electrician to ensure that your stairwell lighting system is installed safely and up to code.
- According to the National Electrical Code (NEC), section 404.2(C), switches that control line-to-neutral lighting loads must have a neutral conductor installed at all switches. This includes switches in bathroom areas, hallways, stairways, and habitable rooms. The purpose of this requirement is to complete a circuit path for electronic lighting control devices, such as occupancy sensors. A grounded conductor is the neutral conductor, which can be white, gray, or a wire with three white stripes on other than green insulation. Article 404 of the NEC specifically bars switching the grounded (neutral) conductor or the grounding conductor.