Fluorescent light connection
Learn how a switch is connected in a two-way switch wiring diagram to control one light from two locations using COM and traveler connections.
light control from two switches
In a two-way switch wiring diagram, the first switch uses the Line to the COM, two traveler wires run to both switches, the second switch uses the light as the COM and Neutral as the lamp.
lamp connection two way switch
A two-way switch wiring diagram is used to illustrate how to use two SPDT (Single Pole Double Throw) switches to turn one light on or off in two different locations, like a staircase, hallway, or bedroom. The purpose of each switch is to switch the line (phase/live) to the traveler wires or to the common (COM) terminal.
The Line of the first switch is connected to the COM terminal. Two traveler wires interconnect L1 and L2 of the first switch and L1 and L2 of the second switch. The lamp (load) is attached to the com terminal of the second switch. The Neutral is straight to the lamp. Any switch can be flipped to switch the current on or off at either point. This is a simple and intelligent method of wiring commonly applied in homes and buildings.
Work / Installation (Inputs → Outputs)
- Input: Line (Phase) → Switch 1 COM
- Travelers: Switch1 (L1/L2) → Switch2 (L1/L2)
- Output: Switch2 COM → Light → Neutral
Thus, any switch can turn the light ON or OFF.
Testing and Final Adjustments
Once wired, restore power and test switches. Flip Switch 1: This should be a light that goes ON or OFF. Flip Switch 2: The light is supposed to flip once more. Repeat a couple of times to ensure smooth running. When you find that the light will only work in a single switch position, verify the connections to the COMs - they can be reversed with traveler terminals. Make sure as well that you connect Neutral only to the light, but not to any switch. Tape exposed copper ends and tighten all screw terminals. Be safe and apply correct color codes (brown/red Line, black/blue Neutral, and green/yellow Earth). And finally, label the switch terminals in a way that will allow them to be easily troubleshooted in the future.
