如何更换开关.docx

10步更换墙壁开关本文内容如下：110步更换墙壁开关2切断电源3移走开关面罩4.检查旧开关5准备好新开关6旋出螺丝7卸下老的接点螺丝8插入导线9更换开关10把开关安回原位11盖好面盖。How to Replace a Wall Switch in 10 StepsInside this ArticleHow to Replace a Wall Switch in 10 Steps 1.Cut Power 2.Remove The Switch Plate Cover 3.Inspect the Old Switch 4.Prep the New Switch 5.Remove Screws 6.Loosen Old Terminal Screws 7.Insert Wires 8.Replace the Switch 9.Put the Switch Back in Place 10.Attach Cover Plate Sometimes a light fixture thats in perfect operating condition doesnt work because the wall switch to the receptacle is faulty. There are several primary symptoms of switch failure:the switch loses its snap or there is no clear distinction between the ON/OFF positions开关弹簧松弛或者开合没有明显区别 flipping the switch no longer turns the light on or off翻转开关不再关灯或开灯。 flipping the switch makes the light flicker, but the light will not stay on or off翻转开关电灯闪烁，但是电灯不会常亮或者常暗。 the switch may work occasionally, but you have to jiggle it back and forth several times to keep the light on开关或许有时候会起作用，你来回轻摇开关几次之后使电灯保持常亮。If you spot any of these symptoms of switch failure, install a replacement wall switch as soon as possible. Heres how:如果你遇到以上任何开关失效的症状，尽速更换之开关，如下：1. Cut Power1.切断开关控制电路Deenergize electrical circuit that controls switch. 2. Remove The Switch Plate Cover卸掉开关面罩，如果面罩不易卸掉，可能是几层油漆粘住了。用剃须刀片或美工刀沿着面盖边缘剃掉油漆以使其松脱。Remove switch cover plate. If cover plate doesnt come off easily, it is probably being held in place by several layers of paint. Use razor blade or utility knife to cut paint closely around edge of plate to free it.3. Inspect the Old Switch检查旧的开关，检查旧开关以确定你需要的开关型式。你必须Inspect old switch to determine type of replacement model you need. (Replace cover until you return with new switch.) You must use the same type, but, in most cases, you can install a better grade of switch than the one you had before. 4. Prep the New SwitchPrepare new switch for installation. Some kinds of wall switches have no terminal screws for conductor attachments. Instead, switch has small holes that are only slightly larger than bare copper conductors. Remove about 1/2 inch of insulation from ends of wires, then push bare ends into holes. Locking tabs make electrical connection and grip wires so they cant pull out. If necessary, release wires from old switch by inserting narrow-blade screwdriver in slots next to wire-grip holes. 5. Remove ScrewsRemove mounting screws on switch cover plate and take off plate. With cover plate removed, youll see two screws holding switch in switch box. If necessary, remove screws, and carefully pull switch out of box as far as attached wires allow. If there are two screws with wires attached, switch is a simple ON/OFF (single-pole) type. If there are three screws with wires attached, youre working with a more complicated type called a three-way switch. Replacement switch must be the same type as old one, either single-pole or three-way. Three-way switches allow you to turn light on and off from two different locations, such as at top and bottom of stairway. Look carefully at three terminal screws; youll see that two are one color while the third is a different color. Do not disconnect any wires until you compare old switch with replacement switch so you know which wire goes to which terminal screw.6. Loosen Old Terminal ScrewsLoosen one of the old terminal screws, remove wire, and attach wire to corresponding terminal screw on new switch. Repeat with remaining wires. Take care to connect wires so all bare wire is safely under screw heads; clip off any excess uninsulated wire. Procedure is the same whether youre working with simple ON/OFF switch or three-way switch, but you must be more careful with the latter. Verify wiring by comparing it with manufacturers diagram on packaging of new switch. 7. Insert WiresIf youre installing modern wire-grip type of wall switch, cut off end of each wire to leave only 1/2 inch of bare wire. Push one bare end wire into each wire-grip hole, and check that wires have caught properly by tugging gently on them. Caution: If wires or insulation going into electrical box are brittle or frayed, that part of circuit should be professionally rewired. 8. Replace the SwitchReplace switch in wall electrical box. Push switch into box carefully, and make sure wires fit neatly into box behind switch. There are small tabs extending from switchs mounting bracket; these tabs should lie flat against wall outside electrical box. They hold switch flush with wall no matter how electrical box is angled inside. 9. Put the Switch Back in PlacePut switch back into place, using two mounting screws provided with new switch. Oval holes in mounting bracket allow you to fasten switch so its straight up and down even when screw holes in electrical box are tilted. 10. Attach Cover PlateAttach cover plate with screws you took out earlier, and replace circuit fuse or trip circuit breaker back on.All switches work on the same general principles, and you can usually choose a switch with features you like best. The single-pole toggle switch is still the most popular. When the toggle switch is mounted properly, the words ON and OFF are upright on the toggle lever, and the light goes on when you flip the switch up. A variation of the traditional toggle switch is the lever-action switch, which lies almost flush with the wall. It turns the fixture on when someone pushes the top of the switch in. The push-button switch has a single button that turns the light on when pressed and off when pressed again. Some switches are available with the extra feature of a built-in neon lamp that glows when the switch is off, making it easy to locate the switch in the dark. Dimmer switches, with a dial to control the brightness, turn the light off when the dial is turned all the way down or pushed in. Some dimmer switches are like toggle types. Sliding the toggle upward increases the lights intensity; sliding it all the way down turns off the light. You can install these switches as replacements for nearly any type of switch. How to Repair a Doorbell in 11 StepsWhen your doorbell or door chime doesnt ring, the fault could be in any part of the circuitry - the button, the bell or chime, or the transformer. The transformer is the electrical component that steps down the 110-120-volt current to the 10 to 18 volts at which doorbells and chimes operate. You can work safely on all parts of a doorbell circuit except the transformer without disconnecting the power.Head over to the next page for the first step.1. Remove the ScrewsRemove screws that hold doorbell push button to your house.2. Remove the ButtonPull out button as far as circuit wires allow, then detach wires by loosening terminal screws on button. Bring the two bare wire ends together. If bell rings, you know fault is in button. Install new one by connecting the two wires to terminal screws of new button and reattaching button to your house. Doorbell button is a single-pole switch (two wires attached), and you can place either wire under either screw3. Check Other Problem AreasIf bell doesnt ring when you bring the two bare wire ends together, fault lies elsewhere - in bell or chime assembly, wiring, or transformer. Remove snap-on cover of bell or chime. Removal may be harder than you expect; there are several different types of covers, and you may have to try several procedures. Try lifting cover slightly upward and then pulling it out. If this doesnt work, pull it straight out without first lifting it up. Or look to see whether snap-on cover is held to bell or chime assembly with prongs; if so, depress prongs and pull cover to release it. Whatever you do, never pull so hard that you risk damaging decorative cover.4. Test the WiresOnce cover is removed, look for two, three, or more terminals and wires, depending on how many tones ring in your doorbell system. A standard bell or buzzer has two wires. Detach wires by loosening terminal screws, then connect them to 12-volt circuit tester, or attach them to terminal screws on substitute bell or chime. An inexpensive bell or buzzer or a 12-volt car lamp bulb in a socket with two wires can be used for testing purposes. If test bell or buzzer sounds or bulb lights when you push doorbell button, you will have to install new bell or chime.If your doorbell or chime doesnt work, the fault could be in any part of the circuitry - from a push button to the bell or chimes to the transformer. Before removing any wires at the terminal strip, its a good idea to tag them so they can be replaced correctly.5. Test the TerminalsIf you have a chime assembly with three or more wires, tag them with masking tape: T for transformer, 2 for front door chime, and 1 for the back door chime. Loosen terminal screws, remove all wires, and connect wires labeled T and 2 to screw terminals on test bell or bulb. If test bell rings or bulb lights when you push front door button, old chime set is faulty. To check this conclusion, connect wires labeled T and 1 to screw terminals on test bell. If bell rings when you push back door button, then youre certain chimes must be replaced.6. Check the TransformerIf bell doesnt ring or bulb doesnt light at button or bell box, both are okay. By process of elimination, you now know problem must be in transformer or wiring. Youll usually find transformer mounted on electrical junction box, subpanel, or main entrance panel. Bell wires are attached to exposed terminal screws on transformer. Connect test bell directly to exposed low-voltage transformer terminals; dont touch any other screws. If bell doesnt ring, transformer is defective or not getting power. Caution: Transformer is connected directly to power supply, and it carries current that can hurt you. Before working on transformer, deenergize branch circuit that supplies power to transformer. Remove appropriate fuse, trip correct circuit breaker, or throw main switch to shut off all electricity in your home.7. Check the Transformer PowerBefore replacing transformer, check to make sure its getting power from the 110-120-volt circuit. With circuit deenergized, disconnect transformer from line wires. Then turn circuit back on again and touch probes of 110-120-volt circuit tester to bare wire ends. If tester light glows or indicator reads 110-120 volts, circuit is okay.8. Remove the Faulty TransformerIf transformer is defective, deenergize circuit, and remove transformer. Buy replacement transformer of the same voltage and wattage. You can find electrical information stamped on transformer, and you should find installation instructions on package. Follow instructions carefully. Use crimp-on connectors or wirenuts to attach new transformer to circuit line wires of your electrical system. Then connect bell wires to low-voltage screw terminals on transformer, turn power back on, and press doorbell button. If youve installed transformer properly, you should hear bell or chime.9. Check the Bell WiringIf transformer and its power circuit prove to be working, the only possibility left is a break or loose connection somewhere in bell wiring. Trace bell circuit from t