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Forum Thread Details
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  • Replies 6 replies
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  • 120v
  • romex
  • ac
  • ac outlet
  • raspberry_pi
  • power
  • home
Related

How to add Romex Cable to this Junction Box

gub11
gub11 over 8 years ago

I live in the US. I am trying to install an ac outlet in my attic. Attached is a metal junction box that looks like it has Romex cable coming out of it. However, the cables go straight to either lights, or other rooms, so how can I add a Romex cable to that junction box? Maybe there is a standard procedure or a diagram that I'm unaware of. And before you all say "hire an electrician, ac voltage is dangerous" I will cut the power to my house completely beforehand, and, for a bit of extra safety, wear rubber gloves and keep 1 hand behind my back. https://www.youtube.com/watch?v=1O85YSd8Vts

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  • jw0752
    0 jw0752 over 8 years ago

    Hi Gabriel,

    There should be several round indentations on the box. These are knock outs and can be removed by hitting them with the tip of the screwdriver. An adapter that screws into the resulting hole can be purchased from a hardware store. Make sure you get the correct size. Here in the US I think the 1/2 inch is the most popular but it must be matched to the size of your knock out. The steel sheathed cable should also be available at the hardware. Be certain to get an adapter that will not only fit into your knock out hole but will also attach to the romex. Once you are inside the junction box you will also have to ID the hot and the neutral wires. Usually the hot is black and the white is neutral. This can sometimes be confused if there are switched lines coming from wall switches to ceiling lights in the box. A small fluke field proximity tester can be very useful to determine this. Junction boxes in the ceiling frequently have only switched hot lines in them. This means that unless the switch that turns on the ceiling light is on you will not have power in the black wire. I do not know your situation but be safe and good luck.

    John

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  • gub11
    0 gub11 over 8 years ago in reply to jw0752

    Thank you for the help.  I am having trouble identifying the necessary adapter and steel sheethed cable.  Do you think you could give me a name/keywords to search or just link me to one that would work?

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  • gub11
    0 gub11 over 8 years ago in reply to jw0752

    Thank you for the help.  I am having trouble identifying the necessary adapter and steel sheethed cable.  Do you think you could give me a name/keywords to search or just link me to one that would work?

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  • jw0752
    0 jw0752 over 8 years ago in reply to gub11

    Hi Gabriel,

    I did not look at your video until after I posted so now I believe that you should use the 12/3 or 14/3 romex and enter the box using this type of adapter clamp. Forget about the steel sheathed wire I mentioned.

     

    https://www.amazon.com/Romex%C2%AE-Connector-1-2-in/dp/B0003S2MEQ

     

    You will still have to make sure the size matches the holes in the box. I also think it would be a good idea to locate the power wires before you do any removal of knockouts or other installation. The outlet box on the other end of the line can be a plastic box in most residential areas. Based on the picture I am assuming that it is a single family residential building. Make sure that your wiring is staple down and secure as this type of wire does not tolerate being move around like an extension cord does. The solid wires can break off if bent too much or pull loose from connection points. The Fluke hot wire tester I mentioned is still a good idea and will allow you to tell if a wire is hot or not just by putting the tester near the wire.

     

    https://www.amazon.com/s/ref=nb_sb_ss_i_1_13?url=search-alias%3Dtools&field-keywords=fluke+voltage+detector&sprefix=Fluke+voltage%2Ctools%2C179&crid=1LRHQG086IBPB

     

    I hope this helps.

     

    John

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