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Rewire a Switch that Controls an Outlet to Control an Overhead Light or Fan

Rewire a Switch that Controls an Outlet to Control an Overhead Light or Fan

by Fred Fauth (email Fred) | | February 9, 2009 | 14 Comments »

Last week I described how an outlet should be wired for switch control when the voltage enters the circuit at the outlet.  This setup is how our master bedroom was wired before I installed an overhead ceiling fan.  As promised, I detail below how to modify this wiring setup with minimal effort so that the switch can instead control an overhead fixture.  Later this week, I’ll post some before and after pics from our ceiling fan installation.  Before we get started, let’s briefly review last week’s diagram:

Review of Switched Outlet Wiring (Power Enters at the Outlet)

In this diagram, voltage enters the circuit at location (A) in a standard 2-wire (+ground) Romex.  The white neutral wire from this Romex is connected directly to the silver terminals on the receptacle (E), and the black hot wire is connected to the white wire running to the switch (B).  The white and black wires from this Romex are connected to the switch (C).  The black wire at the switch is now switched hot which is run back to the receptacle and connected to the gold terminal (D).  The result:  the outlet is only hot when the switch is turned on.

Notice that in this diagram, the neutral wire never leaves the receptacle box.  Voltage exits the receptacle box on the white wire to the switch, and then returns as switched power on the black wire, both in the same Romex cable.

To rewire this circuit to control an overhead fixture, we need to get both hot and neutral to the switch box, and ultimately out a second Romex to an overhead fixture.  We do this by repurposing the Romex between the receptacle and the switch, and adding an additional Romex to the overhead fixture.  Here’s how the wiring diagram changes:

Rewire a Switch to Control an Overhead Fixture

Diagram Explanation

  • Step 1: We need to alter the wiring in the receptacle box to move hot, neutral, and ground up to the switch.  To do this, we use the receptacle as a bridge for the hot and common wires.  For both Romex’s in the receptacle box, the black wires are wired to the brass terminals, the white wires to the silver terminals, and the ground (copper) wires are nutted together and attached with a pigtail to the receptacle itself.
  • Step 2: Add an additional piece of Romex from the switch box to the overhead fixture.  This Romex should be sufficient gauge for the current (12 gauge for 20 amp circuits, 14 gauge for 15 amp circuits).  In our diagram we add 2-wire Romex with the intention that all of the voltage traveling to the overhead fixture will be switched.  We could also add 3-wire Romex and have one switched hot wire, and one constant hot wire running to the overhead fixture.  (This would be useful, for instance, if we were installing a fan with a separate fan and light control).
  • Step 3: Wire nut the neutral wires from both Romex’s in the switch box together.  (This sends neutral up the wire to the fixture).  Connect the black wires from each Romex in the switch box to the switch.  (The black wire running up to the overhead fixture is now switched hot.  Wire nut the ground wires together and add a pigtail to connect the switch.

Additional Notes

  • Note that once hot and neutral are both at the switch, we have a lot of options for expanding this circuit.  We could split the hot wire onto two switches that run to an overhead fixture.  This could be used to give us independent control of a fan and light fixture.  (Alternatively, modern technology gives us the ability to retrofit the switch with a “smart switch” that will independtly control the fan and light on a traditional two-wire circuit).
  • It goes without saying:  Only perform this work if you are qualified (and licensed if necessary) and always turn off the power at the breaker panel before you start work.

ProTool Reviews has a similar guide for wiring a ceiling fan that accounts for several different scenarios- pull chains, multiple switches and more. If this article hasn’t answered all your questions, check out their guide and helpful diagrams.

What do you think? Have you made this type of circuit change in your own home?

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14 Responses to Rewire a Switch that Controls an Outlet to Control an Overhead Light or Fan

  • Jeff responds...
    March 29th, 2009 9:49 am

    How do I throw a dimmer switch (for the lights on fan) into this mix? The dimmer is not on/off, only to dim lights. The gang box would look like this – (1) Romex in (Hot) dimmer switch – jump to on/off switch (dimmer swth & on/off swth in gang box). (2) romex leaving gang box (both no power) to overhead light/fan. Existing hot romex in gang box is currently terminated to on/off switch for 110 outlet on wall. I want this to remain active as t.v. is plugged into it.

    [Reply]

  • Robert responds...
    May 24th, 2009 7:27 pm

    I am currently in the middle of adding a ceiling fan with a light to my bedroom and have encountered a similar situation to what you have described above.

    Where my wiring set up differs is that I have 3 sets of romex coming in to the only outlet in the room that is controlled by the wall switch.

    Inside of the outlet box, The first romex cable – black wire goes to the gold screw, the white wire is connected to the black wires from the other two romex cables in a wire nut. The white wires from the other two romex cables each go to the siver screws.

    How do I determine which wire is which based on your above diagram? Can I still use the switch on the wall to control the fan? I’m not reall concerned with keeping the outlet controlled by the switch anymore if that helps.

    Rob

    [Reply]

  • Fred responds...
    June 1st, 2009 11:22 pm

    Hi Rob,

    I’m going to need some more information. The black wire that goes to the gold screw on the outlet… is that the only wire connected to the gold terminals on the outlet?

    Also, when you look at the side of the outlet, is the bridge between the top set of connectors and bottom set of connectors on either the silver or gold terminals broken? This configuration is frequently used to switch only 1/2 of an outlet while leaving the other outlet hot all the time.

    Assuming that no other wires are present and the bridge isn’t broken, it certainly *seems* like the outlet is wired wrong. It sounds like the neutral wire may have been used to switch the outlet, rather than the hot wire.

    Do you have a voltmeter that you could use to measure the voltage from each wire to ground?

    Note: I’m not an electrician, and it sounds like you aren’t either, so please be careful.

    [Reply]

  • Ben Garcia responds...
    August 19th, 2009 9:46 am

    Need help.. added a room (14 x 18), like to do myself the the wiring. Need to know how to run wires from panel box to outlets ( 2 outlets in each wall), and run wires for lights in closets ( 2 closets w/switches). Also have a bathhroom I need to wire as well. Have 12/14 gauge wire,outlets,boxes,and 100 amp panel box,breakers ( 15-20 amps). Unable to find help online how to wire a room(diagram).

    Thx. Ben

    [Reply]

  • Miguel responds...
    March 28th, 2010 8:17 pm

    Thanks for the excellent post and diagram..It made my job super easy

    Miguel

    [Reply]

  • jaime responds...
    April 3rd, 2010 8:57 pm

    I like to connect a fixture from the existen outlet cant you tell me how to do that. please tell me in my e-mail

    [Reply]

  • Terry responds...
    June 1st, 2010 3:18 pm

    I’m now going through the same scenrio as Robert stated in May 2009, “Inside of the outlet box, The first romex cable – black wire goes to the gold screw, the white wire is connected to the black wires from the other two romex cables in a wire nut. (JUMPES OVER TO THE 2ND GOLD SCREW)The white wires from the other two romex cables each go to the siver screws. THE BRIDGE IS REMOVED FROM THE GOLDEN SIDE TO WORK ON ONLY 1.S OF THE OUTLET.

    [Reply]

  • selevasio k barinisavu responds...
    June 1st, 2010 9:37 pm

    wat is the purpose of the contactor in the control circuit n how can we join or install another contactor to it .?

    [Reply]

  • selevasio k barinisavu responds...
    June 1st, 2010 9:40 pm

    how do you hot wire a switch.

    [Reply]

  • kevin responds...
    January 29th, 2011 12:57 pm

    I have the same problem as this posting. The only difference is that in my switch, I only have two wires…a black and a white…not a ground. The switch controls a plug across the room. I want to wire the switch to control a light, not the plug.

    [Reply]

  • Adding Ceiling Light - DoItYourself.com Community Forums responds...
    May 13th, 2012 12:16 pm

    […] are currently controlled by the switch. Link I've used in the last few bedrooms for reference. Rewire a Switch that Controls an Outlet to Control an Overhead Light or Fan – One Project Closer Current drawing: Drawing with ceiling light: […]

  • William Barrett responds...
    December 18th, 2012 4:16 pm

    I have a box with an outlet and a switch that controls the hood fan for my range. I want to replace the outlet with a GFCI outlet. Can you send me a diagram for that.

    Help

    [Reply]

  • Tara Bank responds...
    November 14th, 2013 9:38 pm

    Hi I need help. I have two outlets which are controlled by the one switch. I have removed the panelling and I see the switch wiring. there are wires one black and white + ground connected to the switch.

    – I want to install a light in the room and it should be controlled by the switch.
    – I want switch should not controll the both outlets. There should be power in the outlets all the time.
    – I do not want to remove pannelling from the outlets because it will be way too much work for me.

    Any easy way to achive the goal, just to rewire from the switch to new light. Thanks

    Tarabank2010@gmail.com

    [Reply]

  • Chris responds...
    June 3rd, 2014 3:25 pm

    What if the power comes in at the switch instead of the outlet?

    [Reply]





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