How do u hook up a light switch

make sure the wire ends face clockwise around the screw for better clamping strength. either way, complete these five steps:Turn off the correct circuit at your electrical panel. you can mount it solidly in drywall without cutting open the wall. the cover plate to the existing switch (the power is off). key to wiring two three-way switches is to run the two wires that were originally connected to the old switch (photo 1) to the “common” terminals. you can't find an unobstructed path for the cable, move the new switch location. A 3-way light switch allows you to control a light source from two separate points. third wire allows power to run to your second switch even if the first one is off. hook the curled end of the wire under the screw, then tighten down the screw to hold the wire firmly in place. keep twisting until the wires are secured and the nut stays in place when let go. practice in wiring a multiswitch circuit is to use two-conductor (black. won't go into the details of running the cable, because each situation is different. you can tuck the wires in the light switch back too -- though they didn't get any work done. and unhook any wire connections that are inside the existing box (wires that weren't connected to the switch). a 2 wire cable between the power source (outlet box, electric panel, etc) and the first switch box. and treat problems with the switches differently depending on the relative placement of the switches and the power source. use a voltage detector to ensure that you're not going to shock yourself once you start working. simply use the new box as a pattern, trace around it on the wall, and enlarge it with a drywall saw.(don't worry about file size -- it should download in seconds even via a modem. by continuing to use our site, you agree to our cookie policy. a cable staple to secure the wires to the wall or stud within 8" of the box. you can't go up or down, you may have to run the cable horizontally through finished walls. the wires to the new three-way switches with ground screws using one of the two wiring diagrams (fig. select username to appear on public areas of the site like community and recipe comments. place of any one shown in the circuits that follow. for example, do not use a romex connector on an armored cable, even though many connectors appear similar. you have to calculate the minimum size required for each box. they consist of a metal jacket formed by an interlocking, helically wound band of steel or aluminum around two (or more) insulated wires - including one white, one black, and often one green. can i find a good diagram for wiring a 2 way switch? if the circuit breaker is 20 amps rather than 15 or the existing wire is 12 gauge, use size 12-3 cable. you can also add as many 4-way switches as you like. of insulation from the end of each wire, then connect the wires following figure b and photo 5.-conductor (black and white) and three-conductor (black, red, and white). be careful not to apply so much pressure that you loosen the box.

How do u hook up a 3 way light switch

How do i hook up a 3 way light switch

it's better to waste a couple of feet than to come up short! nec allows certain exceptions to this in lighting circuits, so that standard. add a second switch, find the easiest way to run a new cable from the existing switch to the best second switch position. current electrical codes require any switch box without built-in clamps to have the wires secured within eight inches of the box. to determine the volume of a metal box, measure and multiply the inside height by the width and the depth. this takes extra effort because you have to cut into, and later repair, finished surfaces. wire nuts to attach the each set of two white wires together. timely diy projects for your home and yard delivered right to your inbox every week!: if you have aluminum wiring, call in a licensed pro who’s certified to work with it. find the circuit breaker (or fuse) that shuts it off. the power supply or feed cable should be "2 wire" (or conductor) cable plus a ground wire., but it's probably better to replace it with a regular, single-pole switch. be sure to strip 9" and pull the wires through into the second switch box. make your house safer and more convenient by following these how-to photos for adding a second light switch. a 3 wire cable from the first switch box to the light fixture's box. are used for "hot" conductors 120 volts with respect to ground. fold the wires back into the box and screw the switch into place. apply for an electrical permit at your local inspections department before starting so an electrical inspector can check your work. slide your mouse over it to see it change state. 1" off of the individual ends of all the smaller wires.'ll also need a wire stripper, 14-3 or 12-3 cable (match existing wire gauge. up and one is down, the current reaches a dead end, no current flows and. Once you're done, you’ll be able to control a light from two switches. the position of the screws varies by manufacturer, but the common terminal is always a different color than the other two hot terminals. check all wire nuts for tightness and exposed neutral and hot conductor surfaces. the only difference is that this 2-wire cable is not a power cable from the wall -- it is a free-hanging cable that you will use to attach the light. don't mount the new boxes until you run the new cable. use a stud finder to find potential obstacles, such as framing. however, if the cable has to run through closed walls. this must be done at each and every box that a cable enters and at each device that provides a termination point for ground. this will make them easier to attach to the actual switches. avoid touching the screw terminals until you confirm that the power is off with your voltage detector.ñol: cablear interruptores de 3 vías, 中文: 装一个3路的照明开关, deutsch: wie man einen 3 wege lichtschalter anschließt, русский: смонтировать трехсторонний выключатель света, italiano: collegare un interruttore a tre vie, português: instalar um interruptor de 3 vias, bahasa indonesia: memasang sakelar lampu 3 arah, français: brancher un va‐et‐vient, العربية: توصيل محوّل ضوئي ثلاثي الوصلات. is required by the code to de-rate the circuit capacity to 80% of maximum.

3 Way Switch Wiring Diagram

How do you hook up a 3 way light switch

drill holes as needed in the framing and fish a new cable through the wall back to the old switch position. when both switches are up, the circuit is complete (top right). in the light fixture's box, there will be two 3 wire cables. ground connection is made to plastic, fiber or another non-conductive box. more extra trips across the room or fumbling up a dark stairway. in such cases, it is convenient and permissable to bring 120 volts. it’s likely you’ll also need to replace the existing switch box with a larger one to accommodate the extra wires for the three-way switch. for comparison, a 120v / 20a circuit is rated to support up to 1920 watts of continuous load (heat, lights, etc. do this by threading a special green, hex-headed grounding machine screw into a pre-tapped hole in the metal box, or use a special green ground clip. your wall framing is open (an unfinished basement or garage, for example), you can easily run the new cable and complete this job in only two hours. light box, which is in turn between some of the switches. you'll just need to attach the cables appropriately to the switches and light now -- but the fixtures will be uncovered by your wall anyway. marking the wire as above, you are informing anyone working in the box later. when obtaining power from a nearby electrical outlet or another circuit device, the new wiring must be the same size as those that supply the outlet. 3 wire cable in the second switch box to the switch. is highly recommended that you complete these ground connections first, and then gently fold them into the rear of the box - out of the way - leaving only the shorter ground leads out for easy connection to devices. the remaining black and red cables (from 3-wire nm) to the traveler screws on the switch. your switches and cannot figure out how to put them back? you'll need two of them, one to replace the existing switch and another for the new switch location. remodeling, always check the fuse or circuit breaker on which new lights or outlets are being installed. light or lights can be controlled by more than one switch. it's easier to push cable through the back than to pull it from the front. into the box (the clamps should push against the sheathing and not the wire; see photo 6) and make sure the wires extend at least 3 in. avoid exterior walls, where you'll run into obstacles such as windows, doors and insulation. diagram shows how to wire the switches and the light when the power is coming to the light switch. cables lacking a green insulated wire use the outer metal jacket as the ground conductor. in most cases, the existing electrical box will be too small to contain the additional wires and connectors needed for the three-way switch (see “sizing the box,” below, to find out). story features diagrams that show how to wire three-way switches. a 3-wire nm cable between the first and second boxes. regardless of what you find in the existing box, the wiring for the three-way switches will not change. size of all the wires in any circuit must be the same size. see below for descriptions and uses of common cable types. strip away 6-9" of the sheathing and pull your wires in so that they can attach to the light. the 2 wire cable feed from the power source enters the bottom of the switch box and the hot (black) wire connects to the common or shunt terminal on the 3-way switch.

How To Wire a Three-Way Switch | The Family Handyman

strip off enough of the rubber coating around your nm wire to expose the wires underneath. off power to the existing switch, unscrew it from the electrical box and pull the switch out of the box. this way, both you and others will know these wires are “hot” and not neutral like most white wires. articleshow to wire a 4 way switchhow to wire a lighthow to understand light switcheshow to install a ceiling fan. you'll find 14-3 cable at any home center or hardware store. article shows you a simple technique for adding a second switch to a stairway light or a light in any room in your home. your two boxes and light fixture into place, then gather your supplies. the wiring on the second switch is nearly identical to the first, except for this key difference: the black wire goes to the light, not to the power source. pull the cables from the front as you push the boxes back into the wall. to all authors for creating a page that has been read 1,406,824 times. for example, a "twelve two (12/2) romex" cable has two #12 conductors, plus a full sized #12 ground. hole into the center of each stud between the box locations and run 14-3 cable from one box opening to the other. the black power cable (from the wall) to the general screw (black) in the three-way light switch. story features diagrams that show how to wire three-way switches. there are unique precautions and instructions for each type and special connectors for armored cables. article shows you a simple technique for adding a second switch to a stairway light or a light in any room in your home. fold all wires carefully into the boxes and secure devices and fixture with screws.:The switches must create a complete circuit for current to flow and the bulb. this project isn't difficult, it does require basic electrical skills: running cable correctly and making solid wiring connections. if possible, keep the second switch the same height off the floor as the first switch. this screw is usually in the upper left side of the switch and is painted black, but check the guide that comes with your switch if you're unsure. only two switches, just ignore the 4-way switches in the above figure. all of these cables have "trade names" which are basically derived from the number of insulated non-ground conductors and construction type. cut the cable to length if there is extra once you pull through the second box. replace the covers for the switches, screw them into place, and turn the power back on to be in business. before you even start wiring, you want to get the fixtures securely in place so that you can effectively wire everything together. connect a three-way switch, the ground wires and all other wires following figure b. up today for free and become part of the family handyman community of diyers. the grouped red and black cables (from 3-wire nm) to the traveler screws. this wiring is dull gray, not the dull orange that’s characteristic of copper. that the above color scheme does not reflect wire color. equipped with a separate ground bar, rather than connecting to the neutral terminal bar, the ground wire can connect to the ground terminal bar. cm) of bare or green insulated wire to this wire-nutted group to allow connection to green ground terminal screws on each device in the box (switches, outlets, fixtures, etc. the 14-3 cable has three insulated conductors: white, black and red (plus a bare ground wire).

How to Wire a 3 Way Light Switch (with Pictures) - wikiHow

[1] although a 3 way is one of the hardest electrical circuits to figure out, it's also one of the most useful. they will screw on easily, and your light is set. add the switch, you’ll use one of two wiring diagrams, depending on whether the power comes to your light switch first (the most common situation) or to the light fixture first. grounding wires, plus one pigtail, tied off by a wire nut. there is only one such terminal on a 3-way switch, and it is usually identified as the one having a different color terminal screw (often significantly darker) from the other two terminal screws (not counting the green ground screw). armored cable types are very similar with only slight variations. if necessary, remove the second switch, rotate it 180 degrees in the box, then reattach it so the two toggle positions are coordinated. of having to walk up a flight of stairs or across the room to turn on a light? this is the wire that will deliver (occasionally) 120 volts to the switch. you can find them at a home center or hardware store. do not connect smaller wires to the electric panel, unless they are the leads of a transformer for a doorbell or similar circuit. again, connect all ground wires as previously described, if not already completed. power comes to the light fixture, then to the light switches. the switches have three hot screw terminals—one “common” and two “travelers”—and a grounding terminal. pull the cable at an angle that minimizes pressure on the plastic cable clamp in the box. wire that is bonded to ground in the circuit breaker panel.) - one length of insulated wire per ground terminal screw. the 2-wire nm power cable into the first switch box. power comes to the light switch, then to the light fixture and the other light switch. you should have a space for a neutral wire (white), a grounding wire, (orange or green) and a power wire (black). you'll run cable from the existing switch to this new switch location, so look for the most accessible path between the two (figure a). if the switch or junction box is metal, it too must be securely grounded with a green ground screw or approved grounding clip. loop it around the screw and fasten it down like any other cable. cm) of wire inside each box before cutting the cable to facilitate easy splicing and connection to the fixture. finally, connect the black wire to the hot supply or the circuit breaker / fuse and the white to the neutral supply or neutral terminal bar in the electrical panel. nm (also called "romex") and uf ("underground feeder") cables both have plastic jacket wrapped around 2 (or more) insulated wires - including one white and one black - and a single uninsulated wire. choose a direction that will make it easy for you to then thread the wire towards your second switch box. white) cable from panel to the first switch, and then three-conductor (black,Red, white) cable between pairs of switches. the black wire leading to the light to your general screw (black). if you're going up through an attic or down through an open basement, drill through the center of the wall plates (top and bottom framing members). wiring of three-way switches is certainly more complicated than that of the more common single-pole switch, but you can figure it out if you follow our diagrams. but if the walls are open, your job is easy. the two red insulated wires together with a wire nut. describe a bit of what the color coding is about, and how wires should be.Dating holidays for singles over 40

How to Install a 3 Way Switch | The Family Handyman

hook the red one up to the side with you black power wire, and the black on the identical screw on the other side of the switch. do you connect a ceiling fan light vent in a bathroom with two separate switches? 3-way light switch allows you to control a light source from two separate points. cm) of wire inside both boxes (source and first switch) before cutting the cable to facilitate easy connection to the switch and power source. strip 6-9" on one end to expose the three separate wires, then run the first half into your first switch box. on the switches, the common terminal will be identified by a label and/or the terminal screw will be a different color than the other two. repeat on the other end and run it into your second switch box. in the above picture, white is always neutral,While black or red may be hot.-way switches are always installed in pairs to control a light from two locations.) that require 20a service (some bathrooms are wired with #12 to support hair dryers, etc. of these armored cable types can be installed outside or underground. up today for free and become part of the family handyman community of diyers. intended to illustrate the voltage state of each wire segment. it covers running new electrical cable and connecting both switches, and replacing undersized electrical boxes. connect the black insulated wire to the shunt or common terminal screw of the switch (once again, the common screw terminal is the different colored screw from the rest of those on the switch). wire nuts to attach the two pairs of green/orange grounding wires together, adding a 6" piece of copper grounding wire to each pair as well. boxes have the volume or the number of wires that it can contain stamped onto the inside back of the box. in the following example:Here are another couple of variations of 3- and 4-way switch circuits. sure to wrap black electrical tape around the ends of all white wires that are used as travelers between the three-way switches. the 3 wire cable's white insulated wire (neutral) directly to the 2 wire 'feed' white insulated (neutral) wire with wire nuts (there is no connection of any white wires to this switch). these screws, often gold, will be on opposite sides of the switch. should be two black wires in your box -- one from the power source, one leading to the other box. the key ingredient is a special type of switch called a “three-way” switch. the second electrical box to the wall and wire a three-way switch, following figure b.: there are several ways to install a 3 way light switch. is not necessary to use #12 wire branching from an existing #14 wire circuit. possible, start at one switch location, run the cable straight up through the stud cavity in the wall to the attic, then come back down through the wall to the second switch. Make your house safer and more convenient by following these how-to photos for adding a second light switch. The wiring is more complicated than a traditional single-pole switch, but we'll explain how to make the connections. last-minute shopping trips by having all your materials ready ahead of time. than two switches, one or more 4-way switches are added between the 3-way. illustration of the function of three- and four-way switch function. one 3 wire cable originates at the first switch box and has its white insulated wire as a neutral. diagram shows how to wire the switches and the light when the power is coming to the light fixture.New york times dating in minnesota

3-way lamp - Wikipedia

you exposed those wires already, but now you need to strip the rubber sheath off of the very end of each of these little wires. to the center of the stud, in the wall, so that it will not be hit by drywall studs later on if you were to hang anything near the light. there should only be one screw left, and it is for that small, 6" free cable attached to the grounding wires. again, be sure to use a cable staple to support the wire within 8" of the box. choosing wire color for your circuit, see later in this page. the red insulated wire to one of the two unused terminal screws (it does not matter which). this article, we'll show you how to run a new electrical cable and connect the two switches. other switches, you won't see “on” and “off” markings on the toggle, since either switch can control the light. you will need:/3/3f/wire a 3 way light switch step 2. it may be as shown at the end of the run, but it may be between any. connected straight through, so that the switch has no effect. also, if you don't have a voltage detector, buy one so you can check for live wires and avoid hazardous shocks. a 2-wire nm cable is actually made up of smaller wires, run together for convenience. is an example of a light in the middle of the run. the ends of every black and red cable into small hooks. connect all ground wires as previously described, if not already completed. of cable projecting from each opening, then tuck it into the stud notches. otherwise, the sheathing could snag or the clamp could break. ideally, both toggles should be in the up or down position when the light is off. if originating from an electric panel or fuse box, #12 copper is the minimum size when connecting to a 20 amp circuit breaker or fuse; #14 copper is the minimum size when connecting to a 15 amp circuit breaker or fuse (aluminum wire on circuits of these capacities has been prohibited for many years). do I use 3-way switches and 4-way switches to control lights from two or more locations? once you're done, you’ll be able to control a light from two switches. install a gauge wire on a circuit that is protected by a breaker or fuse that has a higher capacity than the wire you're using: 6 gauge - 50a, 8 gauge - 40a, 10 gauge - 30a, 12 gauge - 20a, 14 gauge - 15a. for secure connections, hook the ends with a needle nose pliers before placing them under the screw terminals (photo 4). however, if all the existing ground wires connect to one bar and all the existing white wires connect to a different bar, maintaining separate ground and neutral connections is required. cables must be secured so that, if there is tugging or pulling further down the line, the live wires don't rip out of the box and cause issues. the plaster ears off the switches so they'll fit tight on the remodeling box (photo 6). the black insulated wire to the remaining unused terminal screw on the switch. very similar, but the color code is a little trickier. cover the notch and cable with special nail guards and patch the drywall holes. the power source is from an armored cable that lacks a full size (#12 or #14) ground wire, use a metal box to extend the ground from the armored shell to the box and to the circuit's ground wire. you place a light in such a location, please be aware of the confusion that. last-minute shopping trips by having all your materials ready ahead of time. 120v / 15a circuit is rated to support up to 1440 watts of continuous load (heat, lights, etc.

Tutorial: 3-Way Switches and 4-Way Switches

the cables from the front as you slide the box into the wall opening. view an animation showing how this works in a complete circuit, see how. 3 wire cable has an "extra" wire when compared to 2 wire cables, and this wire is nearly always covered in red insulation. the hanging ground wire (the pigtail) to the green grounding screw. mark both ends of this wire by wrapping it with black electrical tape to alert others working on the circuit later that it is no longer neutral. the black electrical tape on the white wire indicates that it’s a hot rather than a neutral. the first switch location has an existing 14-2 cable running to the light. insert the cable into the electrical boxes from the backside (photo 3). the smaller, easier to work and less expensive #14 (14 gauge) copper romex cable if the circuit is protected by a 15 amp fuse or circuit breaker. then you'd connect the black power wire to one side of the switch and the black wire from the light to the other side of the switch and connect the white neutral wires together. of switch boxes (as shown in a later figure), or even between the panel. slip a hacksaw blade between the old box and the wall stud and cut the nails." once you have this wire screwed down, the rest are identical:/b/bf/wire a 3 way light switch step 18. past the outside edge of the box when the box flanges are snug against the wall. the light fixture's box should have only a black wire, a white wire and a ground wire to supply power to the fixture. the 2-wire cable from the second box up and into the light fixture. stranded wire will require fork or ring terminals to be installed (crimped or soldered) on the wire and the terminal screw tightened down on the fork or ring terminal. extra grounding wire will be attached to the light switches. this is a newer electrical code requirement, but has been a common practice whenever a white or gray wire is / or can become hot. the red insulated wire connects to either one of the 2 unused terminal screws (shown in the image above to be on the top left and right sides of both 3-way switches). to place a light between two switches or between the panel and the. then unscrew the grounding screw and cable clamps (if any) in the box. very few three-way circuits switch loads on a 20 amp circuit. addition to standard tools, you may need a “fish tape” to pull wire in closed walls. you'll have to replace the old box with a “remodeling box” anyway so you can pull in the new cable (photo 3). is used indoors and uf is used outdoors, when subjected to sunlight, or when buried underground. you can use as many 4-way switches as you like. that the light can be placed anywhere in the return wire, shown above. to avoid confusion and to conform to code, use a black marker. "back wire-able" option provided on some switches and outlets allows for simple insertion of a stripped wire into a hole for connection without the need of turning a screw. take all three ends and hold them together, then twist on the wire nut so they are all securely fastened together.'ll need 14-3 or 12-3 cable for connecting the three-way switches. trace an outline of the box on the wall, then cut the opening with a drywall saw. making all your connections, fold the wires neatly into the box.

How do u hook up a 3 way light switch

How to replace a 3-Way Switch at The Home Depot

, then the white wire leading from the light to a switch is, in fact,Sometimes hot. if neither option works for your situation, you may have to run cable horizontally through the walls or through the ceiling. the black wire coming from the first 3-way switch and the white "switch leg" wire coming from the second 3-way switch (has black tape wrapped around it) together with a wire nut. do not connect more than one wire under a screw terminal. an existing two-way switch to a three-way switch and run new wire to the second switch location. controlling a light from two switches is a bit more complicated than first meets the eye, especially if you're dealing with finished walls. gently fold any excess wire into the boxes, then screw the switches into place. want roughly 3" of wire in the box, and 6" outside the box. the ground wire should be connected to the neutral terminal bar. head to your fuse box and make sure there is no power coming to the room you're currently working in. some people prefer to do this before feeding into the switch box, but it doesn't matter., the switch cross connects the contacts on the left with the contacts on. the solution is to add a second switch in a convenient location. another 2-wire nm cable through the second switch box, just like you did in the very beginning with the first box. the whole project can be completed in a few hours if you don’t have to do any drywall removal and repair. number 12 gauge is required by code for kitchen and dining room receptacles, and other appliances (washers, refrigerators, etc. don't cut the hole too large; you want a tight fit. it does not matter to which terminal screw this wire is connected. with a pair of three-way switches, either switch can make or break the connection that completes the circuit to the light. the necessary tools for this diy project lined up before you start—you’ll save time and frustration. a "fourteen three (14/3) bx" cable has three #14 conductors, plus a full sized #14 ground. the two wires you unhook from the old switch and the three wires you'll add from the new 14-3 cable are the only wires you need to work with. off power at the main circuit breaker panel before unhooking the existing switch, then check the wires with a voltage detector to verify that the power is off. circuit's maximum design load - in this case watts - is determined by volts x amps x . you local wiring rules, as your local wiring system may use a different color combination. once you decide on a path, measure the amount of cable you need, then add 10 ft. or feed the cable down into the basement or crawl space, then come back up. and, if you need to run the cable through finished walls, you'll also need tools for patching and painting the holes in the walls. slot into the drywall at each stud, notch the studs, fish the cable though the wall, leaving at least 18 in. » categories » home and garden » home improvements and repairs » electrical maintenance » lighting and light switches.(requires javascript enabled):Here is a typical circuit in its four possible states. the 3 wire cable enters through the top of the first switch box. the switch change state (if you have javascript enabled in your browser). a remodeling box has clamps that secure the cable to the box. Ex dating during no contact

introduce ground wire(s) to a terminal bar with only white or gray insulated wires connected or vice versa. this question (or a similar one) is answered twice in this section, please click here to let us know. connect the ground wire to the circuit ground wire(s) with a wire nut or other approved connection (see how to connect electrical wire). take your power wire, coming from the house, and slide it into the first switch box. select username to appear on public areas of the site like community and recipe comments. parts:wiring the switchesinstalling the switches and lightalternative wiringsunderstanding common cable typescommunity q&a. the other 3 wire cable originates at the second switch box and will become the "switch leg". page describes how to use 3-way and 4-way switches to control lights from. you want to zig-zag them, so they come about a bit like an accordion. timely diy projects for your home and yard delivered right to your inbox every week! the power source is an electrical panel or fuse box, the cable should be cut at least long enough to reach the furthest termination point (breaker or fuse, ground and neutral bar) without the need of splicing. if a larger load is to be connected, the appropriately larger sized wire and circuit breaker or fuse must be installed instead. to turn off the power before you do any electrical work. (you may have to pry the box away from the stud slightly to create space for the blade. the other connections the same, even if you have to disconnect them when you change to a larger box. an electrical box for the second three-way switch in the basement. twist the two white, neutral wires together in each box and twist on a wire nut. It covers running new electrical cable and connecting both switches, and replacing undersized electrical boxes. cm) of wire inside each of the boxes before cutting the cable to facilitate easy splicing and connection to the switch and fixture. the methods shown here are some of the safest and most versatile, though not the only options. national electrical code requires electrical boxes to have sufficient volume to hold all the wires, switches, clamps and other components that you intend to put inside them. if you don't have wiring experience or if you get in over your head, don't hesitate to call in a licensed electrician. you only need to focus on the two wires connected to the existing switch. with these, you'll have the convenience of turning a light on and off from two spots. you'll hook this around a screw, which you then tighten to clamp down the wire to the light switch. cable is easier to work than other cable types, requires no special tools or preparation, and costs less. the wiring is more complicated than a traditional single-pole switch, but we'll explain how to make the connections. and instructions to change a single-pole switch to a three-way switch. a, also wrap black tape around the white wire from the switch to the light. it could be said that the maximum amperage of a 15 amp circuit is 12 amps by applying a similar formula: circuit breaker / fuse x . the "switch leg" (white wire with black tape) to the remaining unused terminal screw on the switch. you should have two wires tracing back through your nm cables, and one hanging ground wire on each set.), so you'd need quite a few lights to max-out a 15a / #14 circuit. your two switch boxes should each be wired identically, like so:/7/71/wire a 3 way light switch step 13. Is tom dating ariana from sur