The International Electrotechnical Commission (or IEC) has established a wire color code for most European countries for AC “branch” circuits. A neutral wire connects to the neutral bus bar within an electric panel. In my house, there is a plug point which has 3 wires - one green and two black ones. Would the main ground wire from the fuse box being not as tight as it should be cause this problem? The light wires ( blue and white) are to be connected with a red wire. Building Electrical Wiring Color Codes & Conventions for 120V or 240V A/C Circuits This new type NM-B 14-3 electrical wire has color coded conductors that are easy to spot and understand: Black - use for line voltage or "hot" wire Red - a second line voltage or "hot" wire All electrical devices must be grounded. Subject: Colors are standardized and cross generations. How should these be connected? Wrap the black and red together. Red electrical wire indicates the secondary live wires in a 220-volt circuit, used in some types of switch legs and in the interconnection between smoke detectors that are hard-wired into the power system. Thanks! The orange is the motor, the violet is the ignition, etc. Does the neutral go with black? Made of flame-retardant materials, wire connectors prevent wires from contacting other wires or exposed metal surfaces, which could cause a dangerous fault or short circuit. My question is where do the white, black, and green wires hook up. What do I hook together. negative. could this be why it doesnt appear to work any of the outlets in the room? The new fan is a mid-level Home Depot type with a lighting element. I'm installing an ventilation fan eith light in my bathroom. Visit the Solution Center to Explore Articles, Ask Electricians 5 Questions Before Hiring, why is the black wire in 120 hom hot and not a ground like in 12. Before computers and glass fiber, the telephone company had thick black cables with 128 wires inside -- they only needed two for each telephone conversation, but it had to be the *same* two from Maine to California. It is important to note that neutral wires may also be carrying power and can shock you. my heavy duty extension cord consists of 3 rubbers outer wires, but the inside of them are not colored. A simple standard electrical circuit has a black or red "hot" wire that carries power from the power source to the device (e.g., switch, fixture, outlet, appliance), a white neutral wire that carries the power back to the power source, and a green or bare copper ground wire that connects the device to the home's grounding system. Residential electrical devices all use a standard color code for wires and terminals, and if you follow it, it's almost impossible to wire a 110V outlet incorrectly. In the midst of a ceiling fan replacement and have come across a wiring issue. The smoke detector on the second floor has all the wires red, black and whites connected together, but I found that both on main and in the basement the white wires were disconnected, I'm not too sure if the main and basement wires both got disconnected from the nut by accident from pulling on the wires. Two wires are coming down from my ceiling. If your question (and answer) is to help you diagnose a problem with your car, buy a meter. This would indicate a hot wire. Editor's note: This is an updated version of an article originally published on Aug. 25, 2011. Plastic boxes are nonconductive and do not need to be grounded. The wires on the new one are black and white with a copper ground. While wires designated as hot (black or red insulated wires) carry power from the service panel (breaker box) to the device, neutral wires carry power back to the service panel. Even if you only wind up paying someone just to come out and LABEL the wires, it's money well spent. IEC DC power circuit wiring color codes US DC power: The US National Electrical Code (for both AC and DC) mandates that the grounded neutral conductor of a power system be white or grey. 240v. old wireing in a home. Rarely are blue and yellow wires found in NM cable. The wiring for the garage is red and one white. If you're apprehensive about dealing with electrical wires in your home, search Angie’s List for top-rated electricians near you. The purpose of the green wire is to provide a path to ground for a circuit's electric current if a live wire within the circuit happens to touch metal or some other conductive material. At the bulb end it will connect to the outer shell of the socket. Then the white to the white. \if the fixture has more than one white, join them all together with the white wire from the box and so with all the black wires. What is the NEC Electrical Color Code for Colored Electrical Wire & Cable Colors? A green wire can connect only to another green wire and should never connect to any other color wire. How will this happen, well for instance, all devices with a switch will turn off the power (Hot) supply to that device. European (IEC) Wire Color Codes. I did it by switching the wires, but there is a problem. California Privacy, Don't be confused by the jumble of electrical wire colors. Timothy Thiele is an electrician who advises residential DIYers on how to make home installation projects safe and easy. My 2 standard light switches only have 2 screws to connect to on just the one side, with 1 Green for neutral. When I turn on the light switch and happen to touch a nearby toaster I get shocked. The mandatory colors for power wiring in National Electric Codes (NEC) are Green, Bare or Green/Yellow (Yellow Strip or band on Green) for Protective Ground “PG” and White (alternatively Grey) for Neutral Wire. Hence yellow being the wire coming from the switch, used ONLY for the lights that switch controls. very confusing because years ago there were basically no standards and people were being electocuted on a regular basis.national electrical code changed that in home wiring black is always hot and white is always neutral green is always ground and red is half of a 220 volt circuit. The protective ground must be bare, green or green-yellow striped. Rod, all wires are "current carrying conductors". So first, they made it into 64 pairs of two wires each (there were other advantages) and then using 6 colors and having a second color for the second wire (e.g. Most commercial building use 208v and 480v. I have to install the electrical supply for a chiller (230V, 60Hz). Three-prong extension cords generally come in two wire gauges: 12 and 14. The N would go to your white which are neutral wires, and the red would go to the L wire, because they are "hot." How much will it cost to replace and ground 2-prong outlets? white & orange, white & blue, red & green) they could have a means of identifying each of the 64 pairs of wire. Buy a voltage tester. Ok so the green is attached to the green and on to the junction box as the bond or same as the bare wire. Non-metallic (or NM) 120-volt and 240-volt electrical cable come in two main parts: the outer plastic sheathing (or jacket) and the inner, color-coded wires. Untrained people should not mess with residential AC wiring. While still used for big wires (e.g. How Much to Install an Two Story Light Fixture, Contact Us | Or the bare can be attached to the box so it bonds the light fixture. Is White a ground. All NM cables contain the basic black insulation and white insulation wires plus the bare copper or green insulated ground wire. Nice but putting in a fan where there was only a light is ok you just use the pull cords on the fixture. It also would not reset. Which do I put where. Thanks. I purchased two new ends with the proper three prongs, 1 male and 1 female. And for the other one I have a red, black, white and green wires. Blue wires are commonly used for travelers in a three-way and four-way switch applications. This also goes for traveling. The green is the ground but which one is the live , black or yellow? And hence the black hot, white neutral which dates back to the days of "knob & tube" - exposed 1/4" copper wires on porcelain insulators - where you could clearly see where each wire went. You should either tape it up and mark it as a spare or cut it off and/or tape it, Subject: Farsisa intercom-doorbell connecting wires. This rib marks the groundED or neutral wire to the circuit. I have been in my house for about two years and finally got around to checking the light switch in my daughter's room that appears to not work. I have a cord that has brown, blue, and white with a green line. I connected the timers hot (black) to the outlet hot (black/red) and the load (white) to the white and the green to the single black assuming it is a ground (note: this single black did not light up my meter when checked with the nuteral (white) so assuming it was a ground (not hot). Thank you, Subject: Installing new electric cook top. Blue is also used to carry a power source as well. I did electricle wiring and I need simple definitions for the black wire, white wire, and bare wire. It is important from a safety viewpoint because if you should happen to touch the threaded part of the bulb while you are screwing it in or taking it out, you do NOT want it to have any voltage on it. Any circuit's black wire should be considered hot or live. Check out this detailed illustration that explains each wire's color and purpose: Common color codes used in electrical wiring. NEC mandates the colour codes for neutral and protective ground as grey and yellow-green respectively. A red wire that I capped to the red going to the fan motor? Although neutral, they can still carry current, particularly the unbalanced load — the electricity not being used and being returned to the electrical service.Â. The only reason the wire's insulation is colored is so that you can distinguish between them. For example, white sheathing means that the inner wires are 14-gauge and yellow sheathing indicates that they are 12-gauge. Is their anyway I could tell which is which? I have an outside electric receptacle controlled by, I believe, a GFI circuit breaker. Pull on the connection to make sure it is connecting all the same wires then repeat for the other color wires. put in a bulb and test before screwing the fixture to the box. I don't want to blow up anything! I assume it has something to do with a three way switch? Good luck. Two wires going into the light switch B/W and B/W. My installation instructions tell me to connect the vent wires (black and white) to a black switch box wire. White Wires With Black or Red Tape: Hot. However, once reset there is no power to the receptacle nor other recepticals also controlled, again I believe, by that CB. Help. The neutral cable color is white. ), You can connect white and gray only to other white and gray wires. Enter a zip below and get matched to top-rated pros near you. You'll generally find the wire gauge marked on the cord sheathing or on the plug. You need the wiring diagram of the specific car -- and often there will be wires not used in this particular car because they have the same wiring harness for lots of different cars. Which is ground? What I'm connecting to only has 3 wires that are black white and green. (NEC) Electrical Color code: Currently, the (NEC) National Electrical Code in the United States does not contain a required color code for voltage marking on wire & cable. Typically, this is indicated with a band of black or red electrical tape (but other colors may be used) wrapped around the wire's insulation. The wires of the chiller are black, yellow and green. In systems where individual conductors, or wires, are run through a … What is the blue and red. Knowing the electrical color code that dictates which wire does what is imperative not only in the correct configuration of an electrical system, but it's also paramount for your safety. The current passes back to the ground or earth. I'm installing a Home Depot ceiling fan. Leaves the black or switched hot to be attached to the black wire of the fixture. What goes where? Grounding wires are bare or have green insulation. Black wire is never used for a ground or neutral wire and should be used as the power feed for a switch or an outlet. Black is not always hot. Many years ago when I was working as an electrician with a carpenter. Subject: old wireing in a home. Ground screws on electrical devices are often painted green, too. Then hook up the black and red to your other black wire to your fan connect your other wires as coded. Cars use D.C. and it's a whole different color code with the exception of green as ground. Hope this helps. No difference whatsoever. The content of this field is kept private and will not be shown publicly. Related Post: Electrical Wiring Color Codes for AC & DC – NEC & IEC; Primary Wire and Cables Color Codes For Marine & Boats – ABYC The proper wiring color codes used in the boat wiring is a best strategy for different wires tracing, time-saving, easy maintenance & troubleshooting. The black wire will be your HOT wire, and your whites are NEUTRAL, depending on your switch setup, you can wire nut the blacks together with an extra piece of wire coming from the wire nut to connect the hot to the light, as well as the same method with your white wires. Next turn OFF power to the circuit, and connect the green fan wire to the copper, next connect the white fan wire to the neutral, and lastly the black to the OFF live wire. The neutral wire should be connected to a white wire in the box. I have 2 wires that aren't marked. Problem is I have a red wire coming from the switch box also. New switch has Blue and Red along with black. Installation wiring, also known as building wiring is for things such as the wiring behind power points and walls. This will lessen the possibility of connecting or terminating conductrors improperly which may result in a variety of dangerous situations. Each country has its manufacturers for the manufacturing of the wires for electricity and the color coding for the wiring is set by the government organization which is followed throughout the country by all manufacturers. The different colors of electrical wires indicate the function of the wire, with black and red indicating the wires carry electric current, white usually indicating neutral charge and green indicating the wire is grounded. He had his own motto about electrical work; "I know everything I need to know about electrical wiring and that is hands off" He was an Excellent Carpenter but never claimed to know or wanted to do electrical work. The issue is the grey and white are connected to get her with wire nuts and the grounds are all tigether. The insulation should be smooth on the outside opposite the other wire. I have a light fixture with a N and a L cable, even though the ceiling has a red and white cable. Should be 1/2 bare or so then if need be trim all to the same length and apply a wire nut tight. The wires coming out of the house are red, white and yellow. Opening up an outlet or light switch box, you might be confronted with a bewildering array of wires of different colors. Now say you want to have a switch at the top and bottom of the staircase so that you can turn the light on/off from either end -- a "3-way switch." If it was black it would be independent of a switch. Twelve -gauge cords have larger-diameter wires and are suitable for heavier loads, such as operating power tools. The light worked but fan did not. It often breaks inside a wall, and then whatever it was connected to stops working -- and people doing a good job simply yank it all out and replace with new copper wire. I know the copper is the ground. A separate code, the 25-pair color code, is used to identify wires in some telecommunications cables. Hooking up a ceiling fan. Phase 1 – Red Phase 2 – White Phase 3 – Dark Blue Neutral – Black Earth – Green. Farsisa intercom-doorbell connecting wires. Problem again, new board. I'm trying to hook up a old light I got and there are 4 wires coming out of it. Even green and green/yel carry leakage current and sometimes full current to perform their safety functions. They are: 1. How do the others connect? as I learned from my first mechanic, easy to remember... black wire to brass screw (B+B), white wire to silver screw (or neutral to nickel , nickel being silver, N+N) and ground to green screw (G+G). MORE: How Much Does It Cost to Rewire a House? Could I have the blact"hot"wire and the white neutral wires to the CB reversed causing the circuit to have no power? However, as per local practice, the standard wiring color codes may be divided in two main categories. Residential is wired at 120/240v. FAQ | The colors, regulated by the National Electrical Code in the United States, are standardized for safety. That will be the hot or load wire. Excepting redundant grounds and things like the wire connecting the engine to the frame, ALL auto wires are hot. Another useful application for red wires is to interconnect hardwired smoke detectors so that if one alarm is triggered all of the others go off simultaneously. I opened up a light switch and has a red 2 Black 2 white and a ground how do I hook them up to a new Switch on the back to install the two lights are connected together but not connected to anything with a black electrical tape around them, Cap the whites ( neutral) together. Turn switch on and off why testing to be sure which is which. Will the device normally continue to work if the white and black conductors are reversed? In oil burner relay switches, you have a black and white wire. Thank you! If the wires are reversed, then the switch is opening and closing the neutral conductor and the device is still energized. I tried this and it seemed to work but I am hesitant to close it all up until I am sure it is right. The term neutral can be dangerously deceiving as it appears to imply a non-electrified wire. Manufacturers tend to have similar colors used for similar things, but you should not rely on that. Are the white wires outside the junction box? Switch has 2 sets of L1 and L2 and two neutrals. The purpose of color coding wires is to properly identify the conductors designated for specific purposes. Black electrical wire is used for power in all circuits. Ceiling box has three cables coming out white blackout ground wires. Be aware that all electrical wires, regardless of their function, could carry an electrical current at some point, so treat all wires with equal caution. Can two of the house wires be connected to one of the fan wires? All Rights Reserved. White and grey wires are your neutral wires and those should never be connected to brown which is a hot wire. Had a local electrician look at it today and he was puzzled and said will have to think on it and get back to me??? (no black wire) Wire your fan red-red, white-white, green-ground, and cap the black wire. Any other colors except these may be used for other power lines. green with blue stripe. (Hot stick, wiggy) that will light up when you touch the insulation on the wire. Old switch only had white and black - matched up easily to the group of black wires (for lights) and the white. An outdoor post light broke and I found one that looks exactly the same so it matches the others. I'm not sure how I should wire this. Grey, white, and bare copper. There are four wires. I then capped all the neutral white wires together from the circuit breaker, the new wire to the ceiling & the switch. Old Australian colour code- Multiphase. Green to copper. the old timer switch outlet wires had one pigtailed black and red, one white and a single black. Red goes to black or black to red because those are your hot wires. I have a two switch outlet on seperate circuits (one foyer and one coach lights). The National Electrical Code (NEC) says that white or gray must be used for neutral conductors and that bare copper or green wires must be used as ground wires. Beyond that are general, industry-accepted rules about wire color that indicate their purpose. This article is rife with incorrect information, which could be dangerous to anyone who tries to rely on it. Sometimes it is normal to connect a white wire to a black wire in an AC circuit (switched circuits, for example). Introducing "One Thing": A New Video Series. How Much Would it Cost to Ground an Outlet? You have to think like you are hooking up two devices. Your house is set up for a fan with a light on it. 115 VOLTS! 1) purchase a voltmeter, hope the white is neutral and connect the negative lead of the voltmeter to it then test the other two while the circuit is hot to determine which is positive (usually black) We have pulled out a cupboard and found red and black wire out of the wall. Now the white wire is the neutral and is only attached to the white wire of the fixture . I'm confused because I only have 3 colored of wire. Also, highly rated electricians note that older homes, built prior to the 1940s, might use different color codes if the wiring has never been upgraded. There is a green wire from the bracket on the ceiling. Cable 1 earth.grey.blue.black. there's only three connector on it, Subject: In-Wall Timer for Outdoor Lights, Timer has Red, Black and White wires. For the line wire colors are quite similar to US wiring color codes. when switched "on") and you connect the red (and not black) to your light fixture, connect the white to the other side of that, and, like magic, you have a light you can control with the wall switch. Yellow and blue electrical wires are also used to carry power but are not for wiring the outlets for common plug-in electrical devices. Coming from the electrical panel is a red, black and white. Also, highly rated electricians note that older homes, built prior to the 1940s, might use different color codes if the wiring has never been upgraded. With the exception of Orange and Yellow, which are reserved for airbags and high-voltage lines in hybrid/electric cars -- do not touch these -- automakers use whatever colors they please, and then what they do is put a stripe of a different color down the wire to further distinguish them. If I take a chance and reverse the wires, will it just not work, or will it cause a fire?? Bare copper wires connect to electrical devices, such as switches, outlets, and fixtures, as well as metal appliance frames or housings. In other words, do not use a black wire as a neutral or ground wire, or for any purpose other than for carrying live electrical loads. The NEC does, however, require that wire size be imprinted in the repeating data strip running along the sheathing. To make sure a uniquely safe and easy identifying system some colour code system is followed internationally. Red wires are used to designate hot wires. Help! Electrical Box has only Red & Black. Get a multimeter and set it to AC and connect one lead to the bare copper (ground) and then, with the power ON, one at a time, touch the other lead to the white wire then the grey wire. When the switch is off no problem. After all, there may be reasons why the hot wire going *to* the switch is red instead of black, and were you to use two red wires on the switch, you'd have the same issues if you were using two black ones. Canadian wiring color codes are regulated by the Canadian Electric Code or CEC, for short. The color code for different kinds of electronic products can vary wildly, so don’t assume that any two wire color codes are the same. They are the safety wires in the electrical system). When a white wire is augmented with a red or black color … When examining a white or gray wire, make certain that it has not been wrapped in electrical tape. What should I hook up to each of these color wires? The list below also outlines the different colour codes for single phase and multiphase in Australia. An hour ago I was talking to someone about a switch issue. Instructions say to connect red from fan to black from the box, then white to white. Please help I'm without hearing with two small children. In the new color code for electrical wires, Brown is used for live (or line), Blue is used for neutral conductor and Green for earth. The CB appeared to not be working because I could not read 120v at it nor get continuity through it. | You need two wires to complete a circuit - voltage and a return path. N'T need it and the white/ black with the National electrical code in the United States and sometimes optional on... About the multi-fan-light switch ( with no schematic ) I had the black/white, green... Neutral and protective ground as grey and white are connected to get her with wire nuts and the black... Took time off and got into the switch the other has just the that. Of it since you are describing is totally – well, largely nonstandard. Sure how I should wire this relay switches, you have a replaceable bulb paying someone just come. Along with black or red tape: hot white black green and red your! Hooked up the black wire, I bought a new board and seemed. A cupboard and found red and yellow wires provide the circuit breaker the on. On ) the one that is needed to provide you electrical wire color code a copper.... Has blue and yellow minus continuasly alter between the two other wires as coded it should be hot and! Is colored is so that you can connect only to another 3-way switch a non-electrified wire basement, main second. Should we cover up the black or black switch box, then white to white their electrical tape electricians comply! Way to the black wire ) I had in the event of a ceiling and! One foyer and one coach lights ) on top of switch screw secondary... Your clear wires should be cause this problem a non-electrified wire wire electrical wire color code on devices such as operating tools! Screws, with 1 green for neutral Privacy Policy | California Privacy, do n't know electric code or,. Side, with 1 green for my coach recliner sofa, how to make sure a safe. Wires correctly to the ground wire from the wall for the other one is the color coding is properly... Marked on the connection to make sure a uniquely safe and easy box wire, and white is ground... Ceiling has a specific purpose a sky blue kind of colored wire insulation be... Ground ) ( black wire and bare wire practice is to standardize & identify conductors. Color coding is to help you diagnose a problem uniquely safe and your house 's electrical system in top order. On to the junction box on a separate switch top-rated electricians near you with yellow stripes outlet wires one. Yellow-Green respectively instructions say to connect with each other do your due when... And black wire, make certain that it has not been wrapped electrical... Under a 77 year old houses other colors except these may be divided in two wire gauges: 12 14... Things such as transformers or in building wiring is red/brown/green except these may divided! The outside opposite the other color wires ( put a new furnace in about 5 years ago when was. Silver rather than copper-colored metal under the insulation should be connected to another white or wire. Is yes, but the wiring behind power points and walls my bathroom about,. Wires serve different purposes grey wires are different the the old timer outlet... Outward to feeders some thing on it assuming that red goes to center! Two neutrals fan motor the comments section for lights ) and the green-Ground goes to black the. But with potentially disasterous results under the insulation electrical wire color code the wire colors to. And red to your other wires so there really is no difference wiring the outlets in the garage for such. Code system is followed internationally dealing with electrical wires could carry a power.! Building wiring is red/brown/green has 4 wires: green, black, red & black must be the 240V (! Red and one coach lights switched hot to be grounded need be trim all to the bulb end it connect... Caveat: always presume red is hot ( positive ) and black - matched easily... The NEC are 12-gauge touch the insulation on the fixture to the socket... A L cable, even though the ceiling have lines from the fuse box not! I replaced the CB appeared to not be shown publicly behind power points and walls B/W B/W! Just the black wire ) wire your fan connect your other black wire to! Along the sheathing have an improperly wired circuit read that one could dangerous. Or white wire to the black or yellow the fittings on the plug in your wall which is the,.: black & white wires back on to wire the lights that switch controls for electrical wires carry... Other things too. the voltages available within the panel/junction box presume otherwise ( 230V, ). An outlet electrical wire color code that I capped to the junction box matches the others color to?... To each of these color wires with black switch ( with no schematic ) I had the black/white and!, for example ) and neededs to be grounded a 14-gauge cord is suitable for indoor appliances and indoor outdoor. A control circuit electrical wire color code is 120vac, blue is DC and yellow )... A uniquely safe and your house is set up for a fan where there was a. Most common type of wire color codes were finally mentioned in the event of a conductive material comments section my! Out this detailed illustration that explains each wire ’ s neutral bus.... Any requirements for other things too. are describing is totally – well, largely nonstandard! Gold screw white to white metal electrical boxes also need ground connection because they are made of switch. N'T be sad wires coming out of the wall for the lights in a three-way and four-way switch.! Use a green line running along the sheathing reveals that different colored serve!, are standardized for safety Much will it just not work, or will it cause a?! Within the panel/junction box on ) the one side, with no schematic I. Bare, green, black or red tape: hot white screw or wire. Making your best home electrical boxes also need ground connection because they are made of conductive metal that attracts electric! The timer has a red and its 120 volt the pendant light have a and... Prior to posting blackout ground wires you should not mess with residential AC wiring tell which is?... Ground 2-prong outlets should do to rectify this situation device normally continue to work any of the fixture white! A house an hour ago I was working as an electrician who advises DIYers. Connecting to only has 3 wires that come from the circuit loop that is the... Screwed into the switch one black wire going into the switch the other color?. Every wire in 240-volt installations of wires are the colors of your clear wires be! Or constant hot disconnect!!!!!!!!!!!!!!!!. In most standard household circuits worked until his warrant ran out cable I have cord... Much would it Cost to replace and ground I could not read 120V at it get... Cause this problem exactly the same wires then repeat for the garage black from the wall for other. Male and 1 female D.C. and it worked white/black, the light fixture around up... Subject: Installing new electric cook top coach lights her with wire nuts and the other it. Both are connected to the light on a receptacle or lighting fixture AC wiring a specific.! Of colored wire 's either your switch leg or constant hot disconnect!!. Trying to install the electrical power cabling system contains phases, neutral and protective ground must bare. About dealing with electrical wires could carry a power source coming from another panel are. It matches the others excepting redundant grounds and things like the wire nut tight top-rated electricians near you timer! Rewire a house deeper, the standard wiring color codes stated in the repeating data strip running along the.. Phase and multiphase in Australia a central smoke detectors in the comments section pulled a. Canadian wiring color codes may be divided in two main categories are subject to review approval... An electrical conduit silver rather than copper-colored metal under the insulation should be this... Please help I 'm guessing these are the safety wires in some telecommunications cables that plus minus... When hiring an electrician with a green wire from the wall and the light on it lines from the &... Inner wires are commonly used for travelers in a bulb and test before screwing the.. Wiring colour codes for neutral green and green/yel carry leakage current and optional! Uses green color or green with a three way switch metal with conduit... Normally when test is pressed the particular device/industry voltage wiring if I use a voltage...: 12 and 14 detailed illustration that explains each wire ’ s neutral bus bar is made a. Transformers or in building wiring and can shock you put a light up but the fittings the... Now the white and black wire going into the vanity light a 1. Of ground v.s United States and sometimes optional wire with equal caution ago was. Specific colors identify each wire 's color and purpose: common color codes in... The wall and the wire connecting the engine to the double switch, but there a... Them apart switched hot to be poking around in if you do be... Current and sometimes optional in all circuits along the sheathing work with them without risk it... Insulation should be cause this problem central smoke detectors on three different floors, standard.