Why do single electrical receptacles exist?












5















Given that the following is true.




  • They are the same size.

  • They take the same amount of work to install.

  • They are twice as useful.

  • Double adapters are a thing.


So why do single electrical receptacles even exist? I was looking at the plans for a house and some of the power points were specified to be singles. Is it a code/standards compliance issue? It can't be to make a house $2 cheaper, they wouldn't be worth manufacturing if that were the case.










share|improve this question




















  • 1





    Please add the location to your question. The only single receptacles I've seen commonly used in the US are recessed for a TV (or a clock back in the day) or 220V for a window A/C unit.

    – JPhi1618
    6 hours ago






  • 2





    Also the receptacle for an electric dryer.

    – Barry
    5 hours ago
















5















Given that the following is true.




  • They are the same size.

  • They take the same amount of work to install.

  • They are twice as useful.

  • Double adapters are a thing.


So why do single electrical receptacles even exist? I was looking at the plans for a house and some of the power points were specified to be singles. Is it a code/standards compliance issue? It can't be to make a house $2 cheaper, they wouldn't be worth manufacturing if that were the case.










share|improve this question




















  • 1





    Please add the location to your question. The only single receptacles I've seen commonly used in the US are recessed for a TV (or a clock back in the day) or 220V for a window A/C unit.

    – JPhi1618
    6 hours ago






  • 2





    Also the receptacle for an electric dryer.

    – Barry
    5 hours ago














5












5








5


1






Given that the following is true.




  • They are the same size.

  • They take the same amount of work to install.

  • They are twice as useful.

  • Double adapters are a thing.


So why do single electrical receptacles even exist? I was looking at the plans for a house and some of the power points were specified to be singles. Is it a code/standards compliance issue? It can't be to make a house $2 cheaper, they wouldn't be worth manufacturing if that were the case.










share|improve this question
















Given that the following is true.




  • They are the same size.

  • They take the same amount of work to install.

  • They are twice as useful.

  • Double adapters are a thing.


So why do single electrical receptacles even exist? I was looking at the plans for a house and some of the power points were specified to be singles. Is it a code/standards compliance issue? It can't be to make a house $2 cheaper, they wouldn't be worth manufacturing if that were the case.







electrical receptacle code-compliance






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 28 mins ago









Machavity

7,56111837




7,56111837










asked 6 hours ago









SpikeSpike

344311




344311








  • 1





    Please add the location to your question. The only single receptacles I've seen commonly used in the US are recessed for a TV (or a clock back in the day) or 220V for a window A/C unit.

    – JPhi1618
    6 hours ago






  • 2





    Also the receptacle for an electric dryer.

    – Barry
    5 hours ago














  • 1





    Please add the location to your question. The only single receptacles I've seen commonly used in the US are recessed for a TV (or a clock back in the day) or 220V for a window A/C unit.

    – JPhi1618
    6 hours ago






  • 2





    Also the receptacle for an electric dryer.

    – Barry
    5 hours ago








1




1





Please add the location to your question. The only single receptacles I've seen commonly used in the US are recessed for a TV (or a clock back in the day) or 220V for a window A/C unit.

– JPhi1618
6 hours ago





Please add the location to your question. The only single receptacles I've seen commonly used in the US are recessed for a TV (or a clock back in the day) or 220V for a window A/C unit.

– JPhi1618
6 hours ago




2




2





Also the receptacle for an electric dryer.

– Barry
5 hours ago





Also the receptacle for an electric dryer.

– Barry
5 hours ago










3 Answers
3






active

oldest

votes


















6














There are quite a few reasons to use a single receptacle instead of a duplex receptacle. A few that I know of:




  • Recessed for clock or behind a TV. In this case, it is sometimes easier to use with one centered receptacle instead of top or bottom of a duplex receptacle.

  • Air conditioning, range, dryer or other larger-than-usual circuit (in the US, this means anything > 120V or > 20A). I believe in at least some cases this is a code requirement.

  • Refrigerator or freezer in a GFCI-required area in order to avoid GFCI requirements (subject to local code and AHJ). In this case a second receptacle would be indication of intent to plug in additional devices rather than using a single receptacle for a specific exemption.

  • Cooktop ignition. I have this in my own house. My electrician installed a single receptacle as (a) there is no reason to ever plug in anything else inside the cabinet under the cooktop and (b) he installed it "upside down" - ground pin on top - instead of the more typical (for the US) orientation, for an extra little bit of safety (which would be awkward/confusing elsewhere but for the seldom unplugged cooktop is perfectly fine).

  • Specialized sensitive equipment - e.g., medical or computer - to minimize interference from other equipment on the same circuit (e.g., there are devices that will reboot due to voltage drop if a laser printer starts printing on the same circuit, but which will be fine as long as they are on separate circuits - and any time you have an open receptacle it becomes "available" for a printer or vacuum cleaner or whatever).

  • Backup power - if you have a generator or battery backup with limited power then using single receptacles is a way to make sure that only the specified loads are on the automatically transferred circuits.


I am sure there are more reasons - if anyone has any good ones, feel free to add to this list (or make your own answer if you prefer).






share|improve this answer



















  • 1





    They actually all sound like pretty good reasons. None of them apply in the case I'm looking at though. It's just sitting in the corner of the room on the same circuit as the one in the other corner and about a third of the house.

    – Spike
    3 hours ago











  • @Spike Weird, what did he have a surplus of those? They're worth real money.) I would map your circuits, i.e. find out which breaker powers which outlets. (I'm fond of labeling them with a labelmaker with codewords, Thor, Sif, Odin, Loki, Cap, Widow, Stark, Hulk, Etc. Whatever.) Shrug, maybe he's in a locale where you're only allowed so many receptacles per circuit and he was "over" and that was his answer.

    – Harper
    44 mins ago



















7














enter image description here



Single receptacles are used for reasons



Nobody installs one of these by mistake - they're a lot more expensive, to start with! When you find one, it has a specific purpose for being there because of a Code requirement for its application.




  • It may be in a place where GFCI protection is required, but it is appropriate for this individual load to not be GFCI protected. An example is a refrigerator or freezer in a basement or garage.

  • It may be effectively a dedicated circuit, provisioning power to a single large appliance that needs the entire circuit's capacity. An example might be a large window air conditioner, dishwasher, or built-in microwave oven.


In these cases, providing only one socket is on purpose. It is to prevent you from using the circuit for anything else.



Now, you may know that every room is supposed to have receptacles at certain intervals, (6' in most rooms, 2' on kitchen countertops). These special-purpose receptacles won't count, so you should find a normal receptacle nearby.






share|improve this answer
























  • +1. For reasons.

    – Machavity
    27 mins ago



















2














Sometimes a single receptacle is installed to ensure that the circuit is dedicated to a single appliance. For example, you might install a single receptacle for a sump pump in the basement. If you install a regular duplex receptacle, someone might use that second receptacle and trip the breaker. Nobody notices and the basement floods because the pump is offline. Other examples where a single receptacle might be a good idea:
refrigerator or storage freezer.






share|improve this answer























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    3 Answers
    3






    active

    oldest

    votes








    3 Answers
    3






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    6














    There are quite a few reasons to use a single receptacle instead of a duplex receptacle. A few that I know of:




    • Recessed for clock or behind a TV. In this case, it is sometimes easier to use with one centered receptacle instead of top or bottom of a duplex receptacle.

    • Air conditioning, range, dryer or other larger-than-usual circuit (in the US, this means anything > 120V or > 20A). I believe in at least some cases this is a code requirement.

    • Refrigerator or freezer in a GFCI-required area in order to avoid GFCI requirements (subject to local code and AHJ). In this case a second receptacle would be indication of intent to plug in additional devices rather than using a single receptacle for a specific exemption.

    • Cooktop ignition. I have this in my own house. My electrician installed a single receptacle as (a) there is no reason to ever plug in anything else inside the cabinet under the cooktop and (b) he installed it "upside down" - ground pin on top - instead of the more typical (for the US) orientation, for an extra little bit of safety (which would be awkward/confusing elsewhere but for the seldom unplugged cooktop is perfectly fine).

    • Specialized sensitive equipment - e.g., medical or computer - to minimize interference from other equipment on the same circuit (e.g., there are devices that will reboot due to voltage drop if a laser printer starts printing on the same circuit, but which will be fine as long as they are on separate circuits - and any time you have an open receptacle it becomes "available" for a printer or vacuum cleaner or whatever).

    • Backup power - if you have a generator or battery backup with limited power then using single receptacles is a way to make sure that only the specified loads are on the automatically transferred circuits.


    I am sure there are more reasons - if anyone has any good ones, feel free to add to this list (or make your own answer if you prefer).






    share|improve this answer



















    • 1





      They actually all sound like pretty good reasons. None of them apply in the case I'm looking at though. It's just sitting in the corner of the room on the same circuit as the one in the other corner and about a third of the house.

      – Spike
      3 hours ago











    • @Spike Weird, what did he have a surplus of those? They're worth real money.) I would map your circuits, i.e. find out which breaker powers which outlets. (I'm fond of labeling them with a labelmaker with codewords, Thor, Sif, Odin, Loki, Cap, Widow, Stark, Hulk, Etc. Whatever.) Shrug, maybe he's in a locale where you're only allowed so many receptacles per circuit and he was "over" and that was his answer.

      – Harper
      44 mins ago
















    6














    There are quite a few reasons to use a single receptacle instead of a duplex receptacle. A few that I know of:




    • Recessed for clock or behind a TV. In this case, it is sometimes easier to use with one centered receptacle instead of top or bottom of a duplex receptacle.

    • Air conditioning, range, dryer or other larger-than-usual circuit (in the US, this means anything > 120V or > 20A). I believe in at least some cases this is a code requirement.

    • Refrigerator or freezer in a GFCI-required area in order to avoid GFCI requirements (subject to local code and AHJ). In this case a second receptacle would be indication of intent to plug in additional devices rather than using a single receptacle for a specific exemption.

    • Cooktop ignition. I have this in my own house. My electrician installed a single receptacle as (a) there is no reason to ever plug in anything else inside the cabinet under the cooktop and (b) he installed it "upside down" - ground pin on top - instead of the more typical (for the US) orientation, for an extra little bit of safety (which would be awkward/confusing elsewhere but for the seldom unplugged cooktop is perfectly fine).

    • Specialized sensitive equipment - e.g., medical or computer - to minimize interference from other equipment on the same circuit (e.g., there are devices that will reboot due to voltage drop if a laser printer starts printing on the same circuit, but which will be fine as long as they are on separate circuits - and any time you have an open receptacle it becomes "available" for a printer or vacuum cleaner or whatever).

    • Backup power - if you have a generator or battery backup with limited power then using single receptacles is a way to make sure that only the specified loads are on the automatically transferred circuits.


    I am sure there are more reasons - if anyone has any good ones, feel free to add to this list (or make your own answer if you prefer).






    share|improve this answer



















    • 1





      They actually all sound like pretty good reasons. None of them apply in the case I'm looking at though. It's just sitting in the corner of the room on the same circuit as the one in the other corner and about a third of the house.

      – Spike
      3 hours ago











    • @Spike Weird, what did he have a surplus of those? They're worth real money.) I would map your circuits, i.e. find out which breaker powers which outlets. (I'm fond of labeling them with a labelmaker with codewords, Thor, Sif, Odin, Loki, Cap, Widow, Stark, Hulk, Etc. Whatever.) Shrug, maybe he's in a locale where you're only allowed so many receptacles per circuit and he was "over" and that was his answer.

      – Harper
      44 mins ago














    6












    6








    6







    There are quite a few reasons to use a single receptacle instead of a duplex receptacle. A few that I know of:




    • Recessed for clock or behind a TV. In this case, it is sometimes easier to use with one centered receptacle instead of top or bottom of a duplex receptacle.

    • Air conditioning, range, dryer or other larger-than-usual circuit (in the US, this means anything > 120V or > 20A). I believe in at least some cases this is a code requirement.

    • Refrigerator or freezer in a GFCI-required area in order to avoid GFCI requirements (subject to local code and AHJ). In this case a second receptacle would be indication of intent to plug in additional devices rather than using a single receptacle for a specific exemption.

    • Cooktop ignition. I have this in my own house. My electrician installed a single receptacle as (a) there is no reason to ever plug in anything else inside the cabinet under the cooktop and (b) he installed it "upside down" - ground pin on top - instead of the more typical (for the US) orientation, for an extra little bit of safety (which would be awkward/confusing elsewhere but for the seldom unplugged cooktop is perfectly fine).

    • Specialized sensitive equipment - e.g., medical or computer - to minimize interference from other equipment on the same circuit (e.g., there are devices that will reboot due to voltage drop if a laser printer starts printing on the same circuit, but which will be fine as long as they are on separate circuits - and any time you have an open receptacle it becomes "available" for a printer or vacuum cleaner or whatever).

    • Backup power - if you have a generator or battery backup with limited power then using single receptacles is a way to make sure that only the specified loads are on the automatically transferred circuits.


    I am sure there are more reasons - if anyone has any good ones, feel free to add to this list (or make your own answer if you prefer).






    share|improve this answer













    There are quite a few reasons to use a single receptacle instead of a duplex receptacle. A few that I know of:




    • Recessed for clock or behind a TV. In this case, it is sometimes easier to use with one centered receptacle instead of top or bottom of a duplex receptacle.

    • Air conditioning, range, dryer or other larger-than-usual circuit (in the US, this means anything > 120V or > 20A). I believe in at least some cases this is a code requirement.

    • Refrigerator or freezer in a GFCI-required area in order to avoid GFCI requirements (subject to local code and AHJ). In this case a second receptacle would be indication of intent to plug in additional devices rather than using a single receptacle for a specific exemption.

    • Cooktop ignition. I have this in my own house. My electrician installed a single receptacle as (a) there is no reason to ever plug in anything else inside the cabinet under the cooktop and (b) he installed it "upside down" - ground pin on top - instead of the more typical (for the US) orientation, for an extra little bit of safety (which would be awkward/confusing elsewhere but for the seldom unplugged cooktop is perfectly fine).

    • Specialized sensitive equipment - e.g., medical or computer - to minimize interference from other equipment on the same circuit (e.g., there are devices that will reboot due to voltage drop if a laser printer starts printing on the same circuit, but which will be fine as long as they are on separate circuits - and any time you have an open receptacle it becomes "available" for a printer or vacuum cleaner or whatever).

    • Backup power - if you have a generator or battery backup with limited power then using single receptacles is a way to make sure that only the specified loads are on the automatically transferred circuits.


    I am sure there are more reasons - if anyone has any good ones, feel free to add to this list (or make your own answer if you prefer).







    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered 5 hours ago









    manassehkatzmanassehkatz

    8,7071134




    8,7071134








    • 1





      They actually all sound like pretty good reasons. None of them apply in the case I'm looking at though. It's just sitting in the corner of the room on the same circuit as the one in the other corner and about a third of the house.

      – Spike
      3 hours ago











    • @Spike Weird, what did he have a surplus of those? They're worth real money.) I would map your circuits, i.e. find out which breaker powers which outlets. (I'm fond of labeling them with a labelmaker with codewords, Thor, Sif, Odin, Loki, Cap, Widow, Stark, Hulk, Etc. Whatever.) Shrug, maybe he's in a locale where you're only allowed so many receptacles per circuit and he was "over" and that was his answer.

      – Harper
      44 mins ago














    • 1





      They actually all sound like pretty good reasons. None of them apply in the case I'm looking at though. It's just sitting in the corner of the room on the same circuit as the one in the other corner and about a third of the house.

      – Spike
      3 hours ago











    • @Spike Weird, what did he have a surplus of those? They're worth real money.) I would map your circuits, i.e. find out which breaker powers which outlets. (I'm fond of labeling them with a labelmaker with codewords, Thor, Sif, Odin, Loki, Cap, Widow, Stark, Hulk, Etc. Whatever.) Shrug, maybe he's in a locale where you're only allowed so many receptacles per circuit and he was "over" and that was his answer.

      – Harper
      44 mins ago








    1




    1





    They actually all sound like pretty good reasons. None of them apply in the case I'm looking at though. It's just sitting in the corner of the room on the same circuit as the one in the other corner and about a third of the house.

    – Spike
    3 hours ago





    They actually all sound like pretty good reasons. None of them apply in the case I'm looking at though. It's just sitting in the corner of the room on the same circuit as the one in the other corner and about a third of the house.

    – Spike
    3 hours ago













    @Spike Weird, what did he have a surplus of those? They're worth real money.) I would map your circuits, i.e. find out which breaker powers which outlets. (I'm fond of labeling them with a labelmaker with codewords, Thor, Sif, Odin, Loki, Cap, Widow, Stark, Hulk, Etc. Whatever.) Shrug, maybe he's in a locale where you're only allowed so many receptacles per circuit and he was "over" and that was his answer.

    – Harper
    44 mins ago





    @Spike Weird, what did he have a surplus of those? They're worth real money.) I would map your circuits, i.e. find out which breaker powers which outlets. (I'm fond of labeling them with a labelmaker with codewords, Thor, Sif, Odin, Loki, Cap, Widow, Stark, Hulk, Etc. Whatever.) Shrug, maybe he's in a locale where you're only allowed so many receptacles per circuit and he was "over" and that was his answer.

    – Harper
    44 mins ago













    7














    enter image description here



    Single receptacles are used for reasons



    Nobody installs one of these by mistake - they're a lot more expensive, to start with! When you find one, it has a specific purpose for being there because of a Code requirement for its application.




    • It may be in a place where GFCI protection is required, but it is appropriate for this individual load to not be GFCI protected. An example is a refrigerator or freezer in a basement or garage.

    • It may be effectively a dedicated circuit, provisioning power to a single large appliance that needs the entire circuit's capacity. An example might be a large window air conditioner, dishwasher, or built-in microwave oven.


    In these cases, providing only one socket is on purpose. It is to prevent you from using the circuit for anything else.



    Now, you may know that every room is supposed to have receptacles at certain intervals, (6' in most rooms, 2' on kitchen countertops). These special-purpose receptacles won't count, so you should find a normal receptacle nearby.






    share|improve this answer
























    • +1. For reasons.

      – Machavity
      27 mins ago
















    7














    enter image description here



    Single receptacles are used for reasons



    Nobody installs one of these by mistake - they're a lot more expensive, to start with! When you find one, it has a specific purpose for being there because of a Code requirement for its application.




    • It may be in a place where GFCI protection is required, but it is appropriate for this individual load to not be GFCI protected. An example is a refrigerator or freezer in a basement or garage.

    • It may be effectively a dedicated circuit, provisioning power to a single large appliance that needs the entire circuit's capacity. An example might be a large window air conditioner, dishwasher, or built-in microwave oven.


    In these cases, providing only one socket is on purpose. It is to prevent you from using the circuit for anything else.



    Now, you may know that every room is supposed to have receptacles at certain intervals, (6' in most rooms, 2' on kitchen countertops). These special-purpose receptacles won't count, so you should find a normal receptacle nearby.






    share|improve this answer
























    • +1. For reasons.

      – Machavity
      27 mins ago














    7












    7








    7







    enter image description here



    Single receptacles are used for reasons



    Nobody installs one of these by mistake - they're a lot more expensive, to start with! When you find one, it has a specific purpose for being there because of a Code requirement for its application.




    • It may be in a place where GFCI protection is required, but it is appropriate for this individual load to not be GFCI protected. An example is a refrigerator or freezer in a basement or garage.

    • It may be effectively a dedicated circuit, provisioning power to a single large appliance that needs the entire circuit's capacity. An example might be a large window air conditioner, dishwasher, or built-in microwave oven.


    In these cases, providing only one socket is on purpose. It is to prevent you from using the circuit for anything else.



    Now, you may know that every room is supposed to have receptacles at certain intervals, (6' in most rooms, 2' on kitchen countertops). These special-purpose receptacles won't count, so you should find a normal receptacle nearby.






    share|improve this answer













    enter image description here



    Single receptacles are used for reasons



    Nobody installs one of these by mistake - they're a lot more expensive, to start with! When you find one, it has a specific purpose for being there because of a Code requirement for its application.




    • It may be in a place where GFCI protection is required, but it is appropriate for this individual load to not be GFCI protected. An example is a refrigerator or freezer in a basement or garage.

    • It may be effectively a dedicated circuit, provisioning power to a single large appliance that needs the entire circuit's capacity. An example might be a large window air conditioner, dishwasher, or built-in microwave oven.


    In these cases, providing only one socket is on purpose. It is to prevent you from using the circuit for anything else.



    Now, you may know that every room is supposed to have receptacles at certain intervals, (6' in most rooms, 2' on kitchen countertops). These special-purpose receptacles won't count, so you should find a normal receptacle nearby.







    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered 5 hours ago









    HarperHarper

    71.2k447142




    71.2k447142













    • +1. For reasons.

      – Machavity
      27 mins ago



















    • +1. For reasons.

      – Machavity
      27 mins ago

















    +1. For reasons.

    – Machavity
    27 mins ago





    +1. For reasons.

    – Machavity
    27 mins ago











    2














    Sometimes a single receptacle is installed to ensure that the circuit is dedicated to a single appliance. For example, you might install a single receptacle for a sump pump in the basement. If you install a regular duplex receptacle, someone might use that second receptacle and trip the breaker. Nobody notices and the basement floods because the pump is offline. Other examples where a single receptacle might be a good idea:
    refrigerator or storage freezer.






    share|improve this answer




























      2














      Sometimes a single receptacle is installed to ensure that the circuit is dedicated to a single appliance. For example, you might install a single receptacle for a sump pump in the basement. If you install a regular duplex receptacle, someone might use that second receptacle and trip the breaker. Nobody notices and the basement floods because the pump is offline. Other examples where a single receptacle might be a good idea:
      refrigerator or storage freezer.






      share|improve this answer


























        2












        2








        2







        Sometimes a single receptacle is installed to ensure that the circuit is dedicated to a single appliance. For example, you might install a single receptacle for a sump pump in the basement. If you install a regular duplex receptacle, someone might use that second receptacle and trip the breaker. Nobody notices and the basement floods because the pump is offline. Other examples where a single receptacle might be a good idea:
        refrigerator or storage freezer.






        share|improve this answer













        Sometimes a single receptacle is installed to ensure that the circuit is dedicated to a single appliance. For example, you might install a single receptacle for a sump pump in the basement. If you install a regular duplex receptacle, someone might use that second receptacle and trip the breaker. Nobody notices and the basement floods because the pump is offline. Other examples where a single receptacle might be a good idea:
        refrigerator or storage freezer.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 5 hours ago









        batsplatstersonbatsplatsterson

        12.3k11537




        12.3k11537






























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