![]() Leave the black probe on neutral and move the red probe to the “other” wire going into the switch you will get a reading of approximately 120v when electricity is supplied to that circuit. ![]() Put the black multimeter probe tip on the switch’s neutral wire terminal and the red probe on the ground wire terminal there should be 0v (voltage) displayed. Ok, now you do some testing with your multimeter set to measure AC Volts (Alternating Current Voltage).We usually say this because it is not uncommon for the wire colors to be incorrectly used, which is both bad practice and dangerous!! You will often see a piece of colored tape or tube around wires representing the color the wire should be, and there should be matching tape or tube on the other end note the use of the word should! Black wires are normally HOT (Live), Red are also normally HOT (Live), White is normally NEUTRAL (Common), and Green or Bare copper wire is normally GROUND (Earth). Again DO NOT TOUCH any exposed copper wire or other metal parts of the switch at this stage treat all wires as live until they are proven otherwise. You MUST identify the true function of each wire attached to the light switch with your multimeter.Remove the necessary screws from the switch plate, and carefully lift the switch plate away from the housing, exposing the wiring going into the switch itself. ![]() DO NOT TOUCH any exposed copper wire or other metal parts of the switch. ![]() Remove the outer covering from the switch if it has one modern switches can have clip-on coverings that are easily removed generally by prying with a flathead screwdriver.If the light/s do not come on or there is no light bulb/s in the socket/s, insert known working bulb/s or carry on to 4. If the bulb/s are the smart type with a remote control, you may need to activate it to make the bulb light up. Turn on the light switch you’re going to replace with a smart device the light/s should come on as normal if so, there is obviously power to the light bulb/s.It is imperative to understand that a light bulb that is not glowing or an appliance that is not functioning DOES NOT GUARANTEE THAT THERE IS NO ELECTRICITY AT THAT DEVICES ON/OFF SWITCH OR WALL RECEPTACLE simply because that bulb or appliance may be faulty. A bulb or appliance test is simply a quick way to check that you have the correct switch and whether there is power to that circuit. Check that you have the correct switch that you will be installing your dimmer to control its associated light or lights.Be sure you understand how to select the correct voltage range AC Voltage is what you will be testing. Please read the general instructions on its use, then thoroughly read the measuring AC Voltage (Alternating Current Voltage) section. We strongly recommend purchasing a multimeter and learning how to use it before going any further they are not expensive and are a must-have for carrying out electrical work safely.When you’re ready to install a three-way dimmer switch, start with these safety precautions: Some Safety Precautions for 3-Way Dimmer Switch Wiring But if you’re sure you can handle it, here’s how to get started. If you haven’t done this before, consider calling an expert professional to take care of your wiring. Improving the room’s ambiance and the longevity of your bulbs are only some of the added positives.īefore you get started, remember to try a DIY project only if you have some experience in doing electrical work. After installing a three-way dimmer switch, you’ll economize on power bills and get the right amount of brightness you need at a given time. Installing a dimmer with any light fixture has multiple benefits. Figuring out 3-way dimmer switch wiring is one of the first steps of any DIY project.
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