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ByDave Rongey © Ask the Electrician 2017 Author, Licensed Electrical Contractor

Wiring Diagram for Lights and Switches

How to Wire up Three Lights to One Switch

Light and Switch Electrical Wiring Diagram
Electrical Question: How do I wire up three lights to a switch leg and the main feed from the breaker box

This electrical question came from: Richard, a Homeowner from Greenfield, Indiana

Dave’s Reply:
Thanks for your electrical question Richard

How to Wire up Three Lights to One Switch

How to Wire a Switch
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Home electrical wiring diagrams are an important tool for completing your electrical projects. An electrical wiring diagram can be as simple as a diagram showing how to install a new switch in your hallway, or as complex as the complete electrical blueprint for your new home or home improvement project.


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4 Responses to “Wiring Diagram for Lights and Switches”
  1. john says:

    How do I connect 3 lights to 4 switches. One switch is a 3-way switch, using a main black and white wire, a bath black and white wire, a bedroom black and white wire, and a hall black and white wire? The hall has the two switches. Thank you.

    • Dave Rongey says:

      Hi John,
      From what you have described you are trying to wire 4 switches at one switch box.

      This is the process when all of the lights are connected onto the same circuit or power source:

      Locate the power source cable with the black, white and ground wires.
      The white neutral wires of each light connect to the neutral wire of the main circuit cable.
      The black wire of the power source is tailed out and connected to one of the screw terminals of each the single light switches, and (typically) the black screw of the 3-way switch (see note below).
      The black wire of each light connects to the other screw terminal of each individual single light switch.

      NOTE: The method of wiring used for the 3-way switches will need to be identified and verified so these wires are kept separate from the other single light switches, especially when white wires are used for the 3-way switching process.

      All the ground wires are connected together and attached to the frames of the light switches.

      I do not know the details and layout at this location, however it should be noted that light switches for rooms should be located inside the room where the light is located. For example, you should not be able to turn off the light in a bathroom from anywhere else other than inside the bathroom.

      I hope this helps,
      Dave

  2. Mirza Saleem Baig. says:

    I have a lighting arrangement for 20x20x25 meters(Lx Bx height) hall .how many 400 watt lights can be installed in this hall.

    • Dave Rongey says:

      Mirza,
      The number of light fixtures that would be installed would depend on the amount of illumination that is desired in the hallway. 400 watt lamps put out a lot of light so it would also depend on the exact type and style of light fixture as well.
      Dave

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