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to wire a 3-way like this you first need to run 14/3 romex wire from the light box to each of the 2 switch locations. at each switch connect wires as follows: white wire to common screw(usually black or brass) connect red and black wire to silver colored screws, does not matter which way. in the light box you need to identify you incoming power, once you have identified that wire connect one of the white wires from the new 14/3 romex to it,secure with wire nut.the red and black in each 14/3 romex are connected red to red, black to black. this should leave you with one white wire frm a 14/3 romex, this connects to the black wire of your light fixture, the white of your light fixture connects to the white of the incoming power wire.

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โˆ™ 2007-03-18 01:50:36
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Q: How do you wire a three-way switch when the power supply is in the light box?
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Related questions

Is it still within code to run power from panel to light switch then to light?

You can either go to switch or to light first. I wired house for my brother ran power supply from junction box then to each switch then to light. Passed inspection no problem

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That's one I've never seen. Does the bathroom light turn ON when the bedroom light is switched Off? Does the bathroom light switch turn the bathroom light on and off normally when the bedroom light switch is left on? Need to answer these questions, then find where the bathroom light power comes from. It's power supply should either go directly from the power oanel to the bathroom light or to the bathroom light switch. The bathroom light switch merely acts as an interrupter for the hot leg of this power supply.

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I can not understand your question.

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A switch mode power supply incorporates a switching regulator to convert the electrical power efficiently.

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When switch is off of power supply output shown on the multimeter is negative voltage from power supply?


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SMPS stands for?

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Full form of smps?

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The upstream supply has been interrupted.

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In a compound Microscope, Power Switch turns on the lamp( Light source)