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Can someone explain how this makes sense electrically?

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Can someone explain how this makes sense electrically?


What could be causing there to be no power at my ceiling fixture?How to connect two dimmers to control two sets of lights independentlyHow do I connect a new fixture to a box with two black and two white wires?Two lights on a 3-Way Circuit with Separate DimmersIs it okay for an electrical switch to get warm?One Circuit Tripping Another CircuitWhere to locate light switches?How can I wire 3 Lutron Caseta dimmer switches in bathroom?3-Way Switch won't turn on lights if dimmer is set to lowKitchen dimmer dims lights in adjacent room, but not always













2















The wiring in my house is... odd. Nearly every pair of outlets has one of the outlets connected to a light switch. Sometimes that switch is quite far from the outlet even when there are other closer switches that seem to control nothing at all. Sometimes that switch also controls overhead lighting, which makes no sense to me from a design standpoint. Sometimes that switch is a dimmer switch, which is a really horrible idea as if you plug anything other than a light bulb into it, like some electronics, the dimmer switch could do them a lot of damage. One such dimmer switch is also connected to a ceiling fan, and setting the switch to anything less than full does not change the speed of the fan, it just makes it a lot noisier (AC induction motor, obviously).



There are light fixtures that don't seem to have any power to them and aren't controlled by any switch, though I could believe the switch might just be hiding somewhere. There are also switches that seem to control absolutely nothing, though I could believe I just haven't found what they're connected to.



The oddest thing I have found though has to do with the circuit breakers around overhead lighting. I have a chandelier in my dining room that is connected to a dimmer switch. When I moved in, all of the bulbs were incandescents, and I wanted to be more energy efficient, so I replaced them all with dimmable LED bulbs. Now however, I could not turn the chandelier fully off, with the dimmer switch all the way down, the lights still dimly shone. This had never been an issue before, but I thought it probably meant the dimmer switch was faulty, and it was just the different voltage response curves of the incandescents versus the LEDs that meant it had never been noticed before, so I set out to replace the switch.



Now there are two circuit breakers that are relevant to this chandelier. One is labeled "dining room," the other is labeled "lights." As far as I can tell, the dining room breaker controls all of the outlets in the dining room area, while the lights breaker controls all of the overhead lighting in the house.



Here's where the odd part comes in. If I turn off the dining room breaker, the lights stay lit. I have turn off the lights breaker to switch off the lights. However, if I only turn off the lights breaker, and go into the switch panel with my voltmeter, I am still detecting 100V AC across the switch (with it off), even though the lights stay off when I turn the switch on. In order to remove the power I was detecting, I have to also turn off the dining room breaker, even though the lights were staying on when I switched that off.



This conforms to no type of electrical theory with which I am familiar, though there might be some peculiarity of household wiring I don't know about that explains this. Can anyone tell me what might be going on?










share|improve this question







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    2















    The wiring in my house is... odd. Nearly every pair of outlets has one of the outlets connected to a light switch. Sometimes that switch is quite far from the outlet even when there are other closer switches that seem to control nothing at all. Sometimes that switch also controls overhead lighting, which makes no sense to me from a design standpoint. Sometimes that switch is a dimmer switch, which is a really horrible idea as if you plug anything other than a light bulb into it, like some electronics, the dimmer switch could do them a lot of damage. One such dimmer switch is also connected to a ceiling fan, and setting the switch to anything less than full does not change the speed of the fan, it just makes it a lot noisier (AC induction motor, obviously).



    There are light fixtures that don't seem to have any power to them and aren't controlled by any switch, though I could believe the switch might just be hiding somewhere. There are also switches that seem to control absolutely nothing, though I could believe I just haven't found what they're connected to.



    The oddest thing I have found though has to do with the circuit breakers around overhead lighting. I have a chandelier in my dining room that is connected to a dimmer switch. When I moved in, all of the bulbs were incandescents, and I wanted to be more energy efficient, so I replaced them all with dimmable LED bulbs. Now however, I could not turn the chandelier fully off, with the dimmer switch all the way down, the lights still dimly shone. This had never been an issue before, but I thought it probably meant the dimmer switch was faulty, and it was just the different voltage response curves of the incandescents versus the LEDs that meant it had never been noticed before, so I set out to replace the switch.



    Now there are two circuit breakers that are relevant to this chandelier. One is labeled "dining room," the other is labeled "lights." As far as I can tell, the dining room breaker controls all of the outlets in the dining room area, while the lights breaker controls all of the overhead lighting in the house.



    Here's where the odd part comes in. If I turn off the dining room breaker, the lights stay lit. I have turn off the lights breaker to switch off the lights. However, if I only turn off the lights breaker, and go into the switch panel with my voltmeter, I am still detecting 100V AC across the switch (with it off), even though the lights stay off when I turn the switch on. In order to remove the power I was detecting, I have to also turn off the dining room breaker, even though the lights were staying on when I switched that off.



    This conforms to no type of electrical theory with which I am familiar, though there might be some peculiarity of household wiring I don't know about that explains this. Can anyone tell me what might be going on?










    share|improve this question







    New contributor




    Joel Croteau is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.






















      2












      2








      2








      The wiring in my house is... odd. Nearly every pair of outlets has one of the outlets connected to a light switch. Sometimes that switch is quite far from the outlet even when there are other closer switches that seem to control nothing at all. Sometimes that switch also controls overhead lighting, which makes no sense to me from a design standpoint. Sometimes that switch is a dimmer switch, which is a really horrible idea as if you plug anything other than a light bulb into it, like some electronics, the dimmer switch could do them a lot of damage. One such dimmer switch is also connected to a ceiling fan, and setting the switch to anything less than full does not change the speed of the fan, it just makes it a lot noisier (AC induction motor, obviously).



      There are light fixtures that don't seem to have any power to them and aren't controlled by any switch, though I could believe the switch might just be hiding somewhere. There are also switches that seem to control absolutely nothing, though I could believe I just haven't found what they're connected to.



      The oddest thing I have found though has to do with the circuit breakers around overhead lighting. I have a chandelier in my dining room that is connected to a dimmer switch. When I moved in, all of the bulbs were incandescents, and I wanted to be more energy efficient, so I replaced them all with dimmable LED bulbs. Now however, I could not turn the chandelier fully off, with the dimmer switch all the way down, the lights still dimly shone. This had never been an issue before, but I thought it probably meant the dimmer switch was faulty, and it was just the different voltage response curves of the incandescents versus the LEDs that meant it had never been noticed before, so I set out to replace the switch.



      Now there are two circuit breakers that are relevant to this chandelier. One is labeled "dining room," the other is labeled "lights." As far as I can tell, the dining room breaker controls all of the outlets in the dining room area, while the lights breaker controls all of the overhead lighting in the house.



      Here's where the odd part comes in. If I turn off the dining room breaker, the lights stay lit. I have turn off the lights breaker to switch off the lights. However, if I only turn off the lights breaker, and go into the switch panel with my voltmeter, I am still detecting 100V AC across the switch (with it off), even though the lights stay off when I turn the switch on. In order to remove the power I was detecting, I have to also turn off the dining room breaker, even though the lights were staying on when I switched that off.



      This conforms to no type of electrical theory with which I am familiar, though there might be some peculiarity of household wiring I don't know about that explains this. Can anyone tell me what might be going on?










      share|improve this question







      New contributor




      Joel Croteau is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.












      The wiring in my house is... odd. Nearly every pair of outlets has one of the outlets connected to a light switch. Sometimes that switch is quite far from the outlet even when there are other closer switches that seem to control nothing at all. Sometimes that switch also controls overhead lighting, which makes no sense to me from a design standpoint. Sometimes that switch is a dimmer switch, which is a really horrible idea as if you plug anything other than a light bulb into it, like some electronics, the dimmer switch could do them a lot of damage. One such dimmer switch is also connected to a ceiling fan, and setting the switch to anything less than full does not change the speed of the fan, it just makes it a lot noisier (AC induction motor, obviously).



      There are light fixtures that don't seem to have any power to them and aren't controlled by any switch, though I could believe the switch might just be hiding somewhere. There are also switches that seem to control absolutely nothing, though I could believe I just haven't found what they're connected to.



      The oddest thing I have found though has to do with the circuit breakers around overhead lighting. I have a chandelier in my dining room that is connected to a dimmer switch. When I moved in, all of the bulbs were incandescents, and I wanted to be more energy efficient, so I replaced them all with dimmable LED bulbs. Now however, I could not turn the chandelier fully off, with the dimmer switch all the way down, the lights still dimly shone. This had never been an issue before, but I thought it probably meant the dimmer switch was faulty, and it was just the different voltage response curves of the incandescents versus the LEDs that meant it had never been noticed before, so I set out to replace the switch.



      Now there are two circuit breakers that are relevant to this chandelier. One is labeled "dining room," the other is labeled "lights." As far as I can tell, the dining room breaker controls all of the outlets in the dining room area, while the lights breaker controls all of the overhead lighting in the house.



      Here's where the odd part comes in. If I turn off the dining room breaker, the lights stay lit. I have turn off the lights breaker to switch off the lights. However, if I only turn off the lights breaker, and go into the switch panel with my voltmeter, I am still detecting 100V AC across the switch (with it off), even though the lights stay off when I turn the switch on. In order to remove the power I was detecting, I have to also turn off the dining room breaker, even though the lights were staying on when I switched that off.



      This conforms to no type of electrical theory with which I am familiar, though there might be some peculiarity of household wiring I don't know about that explains this. Can anyone tell me what might be going on?







      electrical lighting circuit-breaker led dimmer-switch






      share|improve this question







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      asked 1 hour ago









      Joel CroteauJoel Croteau

      1134




      1134




      New contributor




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      New contributor





      Joel Croteau is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






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          2 Answers
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          2















          However, if I only turn off the lights breaker, and go into the switch panel with my voltmeter, I am still detecting 100V AC across the switch (with it off), even though the lights stay off when I turn the switch on. … Can anyone tell me what might be going on?




          Coupling between wires (inductance and capacitance in parallel wires).



          You say you have strange long runs between outlets and switches — if any of these extra lengths run in parallel, this is a great environment for the voltage from one to be induced in the other if it's disconnected.



          If you try putting a load, like a small light bulb, across that 100 V, it will vanish (read 0 V), because there is no significant current capacity in this coupling






          share|improve this answer






























            1














            Run down in laymens



            1. Light switch to outlet. You will see a lot of these in older homes. By code for a long time in a lot of areas you had to be able to turn on a light from a switch accessible when entering a room. Easiest and cost effective way to do this is put switch to outlet. I had six rooms in my house like this.


            2. Dimmer to outlet. For sure not code. You are correct that it could damage electronics and could be a huge fire/safey issue. Please replace this with a regular switch ASAP - $5 for a quick fix while you work things out.


            3. Dimmer to ceiling fan. Can't do this. If the ceiling fan has two hots coming into the box from fan you can buy a fan control + dimmer. If there is only one hot then you just install a switch and it is off/on for both.


            4. Light switches doing nothing. You must do a complete mapping assessment of your house. With a house like this it might take 3-6 hours. But you have to turn off one circuit at a time and figure out what doesn't work. You must also for 100% sure make sure that each switch is tested for working on every light and outlet (have a known working bulb). Write down every outlet and switch in a spreadsheet marking room, location, what it controls, and circuit.


            5. You cannot expect to plug LED bulbs into old dimmers and expect them to work. You need to put in a dimmer that is suitable for the type of LED you are installing.


            6. The dining room lights - need more info.






            share|improve this answer






















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              2 Answers
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              2















              However, if I only turn off the lights breaker, and go into the switch panel with my voltmeter, I am still detecting 100V AC across the switch (with it off), even though the lights stay off when I turn the switch on. … Can anyone tell me what might be going on?




              Coupling between wires (inductance and capacitance in parallel wires).



              You say you have strange long runs between outlets and switches — if any of these extra lengths run in parallel, this is a great environment for the voltage from one to be induced in the other if it's disconnected.



              If you try putting a load, like a small light bulb, across that 100 V, it will vanish (read 0 V), because there is no significant current capacity in this coupling






              share|improve this answer



























                2















                However, if I only turn off the lights breaker, and go into the switch panel with my voltmeter, I am still detecting 100V AC across the switch (with it off), even though the lights stay off when I turn the switch on. … Can anyone tell me what might be going on?




                Coupling between wires (inductance and capacitance in parallel wires).



                You say you have strange long runs between outlets and switches — if any of these extra lengths run in parallel, this is a great environment for the voltage from one to be induced in the other if it's disconnected.



                If you try putting a load, like a small light bulb, across that 100 V, it will vanish (read 0 V), because there is no significant current capacity in this coupling






                share|improve this answer

























                  2












                  2








                  2








                  However, if I only turn off the lights breaker, and go into the switch panel with my voltmeter, I am still detecting 100V AC across the switch (with it off), even though the lights stay off when I turn the switch on. … Can anyone tell me what might be going on?




                  Coupling between wires (inductance and capacitance in parallel wires).



                  You say you have strange long runs between outlets and switches — if any of these extra lengths run in parallel, this is a great environment for the voltage from one to be induced in the other if it's disconnected.



                  If you try putting a load, like a small light bulb, across that 100 V, it will vanish (read 0 V), because there is no significant current capacity in this coupling






                  share|improve this answer














                  However, if I only turn off the lights breaker, and go into the switch panel with my voltmeter, I am still detecting 100V AC across the switch (with it off), even though the lights stay off when I turn the switch on. … Can anyone tell me what might be going on?




                  Coupling between wires (inductance and capacitance in parallel wires).



                  You say you have strange long runs between outlets and switches — if any of these extra lengths run in parallel, this is a great environment for the voltage from one to be induced in the other if it's disconnected.



                  If you try putting a load, like a small light bulb, across that 100 V, it will vanish (read 0 V), because there is no significant current capacity in this coupling







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered 57 mins ago









                  Kevin ReidKevin Reid

                  1,3691521




                  1,3691521























                      1














                      Run down in laymens



                      1. Light switch to outlet. You will see a lot of these in older homes. By code for a long time in a lot of areas you had to be able to turn on a light from a switch accessible when entering a room. Easiest and cost effective way to do this is put switch to outlet. I had six rooms in my house like this.


                      2. Dimmer to outlet. For sure not code. You are correct that it could damage electronics and could be a huge fire/safey issue. Please replace this with a regular switch ASAP - $5 for a quick fix while you work things out.


                      3. Dimmer to ceiling fan. Can't do this. If the ceiling fan has two hots coming into the box from fan you can buy a fan control + dimmer. If there is only one hot then you just install a switch and it is off/on for both.


                      4. Light switches doing nothing. You must do a complete mapping assessment of your house. With a house like this it might take 3-6 hours. But you have to turn off one circuit at a time and figure out what doesn't work. You must also for 100% sure make sure that each switch is tested for working on every light and outlet (have a known working bulb). Write down every outlet and switch in a spreadsheet marking room, location, what it controls, and circuit.


                      5. You cannot expect to plug LED bulbs into old dimmers and expect them to work. You need to put in a dimmer that is suitable for the type of LED you are installing.


                      6. The dining room lights - need more info.






                      share|improve this answer



























                        1














                        Run down in laymens



                        1. Light switch to outlet. You will see a lot of these in older homes. By code for a long time in a lot of areas you had to be able to turn on a light from a switch accessible when entering a room. Easiest and cost effective way to do this is put switch to outlet. I had six rooms in my house like this.


                        2. Dimmer to outlet. For sure not code. You are correct that it could damage electronics and could be a huge fire/safey issue. Please replace this with a regular switch ASAP - $5 for a quick fix while you work things out.


                        3. Dimmer to ceiling fan. Can't do this. If the ceiling fan has two hots coming into the box from fan you can buy a fan control + dimmer. If there is only one hot then you just install a switch and it is off/on for both.


                        4. Light switches doing nothing. You must do a complete mapping assessment of your house. With a house like this it might take 3-6 hours. But you have to turn off one circuit at a time and figure out what doesn't work. You must also for 100% sure make sure that each switch is tested for working on every light and outlet (have a known working bulb). Write down every outlet and switch in a spreadsheet marking room, location, what it controls, and circuit.


                        5. You cannot expect to plug LED bulbs into old dimmers and expect them to work. You need to put in a dimmer that is suitable for the type of LED you are installing.


                        6. The dining room lights - need more info.






                        share|improve this answer

























                          1












                          1








                          1







                          Run down in laymens



                          1. Light switch to outlet. You will see a lot of these in older homes. By code for a long time in a lot of areas you had to be able to turn on a light from a switch accessible when entering a room. Easiest and cost effective way to do this is put switch to outlet. I had six rooms in my house like this.


                          2. Dimmer to outlet. For sure not code. You are correct that it could damage electronics and could be a huge fire/safey issue. Please replace this with a regular switch ASAP - $5 for a quick fix while you work things out.


                          3. Dimmer to ceiling fan. Can't do this. If the ceiling fan has two hots coming into the box from fan you can buy a fan control + dimmer. If there is only one hot then you just install a switch and it is off/on for both.


                          4. Light switches doing nothing. You must do a complete mapping assessment of your house. With a house like this it might take 3-6 hours. But you have to turn off one circuit at a time and figure out what doesn't work. You must also for 100% sure make sure that each switch is tested for working on every light and outlet (have a known working bulb). Write down every outlet and switch in a spreadsheet marking room, location, what it controls, and circuit.


                          5. You cannot expect to plug LED bulbs into old dimmers and expect them to work. You need to put in a dimmer that is suitable for the type of LED you are installing.


                          6. The dining room lights - need more info.






                          share|improve this answer













                          Run down in laymens



                          1. Light switch to outlet. You will see a lot of these in older homes. By code for a long time in a lot of areas you had to be able to turn on a light from a switch accessible when entering a room. Easiest and cost effective way to do this is put switch to outlet. I had six rooms in my house like this.


                          2. Dimmer to outlet. For sure not code. You are correct that it could damage electronics and could be a huge fire/safey issue. Please replace this with a regular switch ASAP - $5 for a quick fix while you work things out.


                          3. Dimmer to ceiling fan. Can't do this. If the ceiling fan has two hots coming into the box from fan you can buy a fan control + dimmer. If there is only one hot then you just install a switch and it is off/on for both.


                          4. Light switches doing nothing. You must do a complete mapping assessment of your house. With a house like this it might take 3-6 hours. But you have to turn off one circuit at a time and figure out what doesn't work. You must also for 100% sure make sure that each switch is tested for working on every light and outlet (have a known working bulb). Write down every outlet and switch in a spreadsheet marking room, location, what it controls, and circuit.


                          5. You cannot expect to plug LED bulbs into old dimmers and expect them to work. You need to put in a dimmer that is suitable for the type of LED you are installing.


                          6. The dining room lights - need more info.







                          share|improve this answer












                          share|improve this answer



                          share|improve this answer










                          answered 56 mins ago









                          DMooreDMoore

                          28.6k1351120




                          28.6k1351120




















                              Joel Croteau is a new contributor. Be nice, and check out our Code of Conduct.









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