Questions tagged [junction-box]

A junction box is a container used to enclose electrical connections (junctions).

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1answer
16 views

Installing fixture with no junction box and off-center stud

I asked a question earlier today here because I took down an old wall-mounted light fixture in my bathroom above the vanity, and was going to replace it with a new fixture. Unfortunately there's no ...
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4answers
1k views

How can I fix the mounting of these outlets in this box that is taller than the outlet?

I have 4 outlets in my garage mounted in an exposed box where they do not seem to be centered. (This seems to be a 4-11/16" box.) Removing the cover plate reveals that each pair of outlets is ...
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4answers
3k views

“Old Work” electrical box: should it be screwed into the stud?

I'm interested in replacing an existing outlet (in a wall that's finished with drywall) with a two-gang duplex (four outlets total), using an "old work" box. This box is located in the ...
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2answers
49 views

Rigidity (and height) of drywall around outlet hole

We are dealing with a subpar contractor who has tried multiple times now to repair a small section of subway tile that they previously cracked. I suspect that their current strategy is going to lead ...
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2answers
63 views

Remove a nail-in box with 3 romex cables and not cut drywall?

Single gang nail-in box for thermostat was about 1" recessed and probably too small for 3 romex cables of 10g wire. Orig. installer 30 years ago left 1.5 inches of sheathing on all cables. ...
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1answer
35 views

Mirror with sconce lighting cracked

I am looking for some advice here. I own a cleaning business, and a client is claiming that my staff cracked their mirror. They've been long-time clients, AND are very quick to complain about things ...
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2answers
46 views

Should my light fixture be grounded through the box?

I’m trying to install a new light fixture in Chicagoland. From what I’ve read, junction boxes here do not have a grounding wire and are instead grounded through the junction box. Is there an easy way ...
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1answer
30 views

Can this ceiling box support a 12 lbs ceiling fan?

I live in a house that was built in 1999, this outlet currently mounts a light fixture. I want to replace the lights with a ceiling fan but I am not sure if the current outlet box will support the fan....
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25 views

Light switch dimmer

I am replacing a old turn knob dimmer with a new dimmer. The new dimmer has 4 wires, a red, a white, a black and a green. My old one is wired up with two red wires and a black wire, in the junction ...
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2answers
743 views

Complex continuous run vs easier single junction boxes

I am currently in the process of finishing my basement and I am doing the electrical wiring of all my rooms. The work will be checked by my electrician before he connects everything to the electrical ...
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1answer
48 views

Outlet box between shallow and standard?

Is there an outlet box that's shallower than a standard, but not as shallow as a "shallow"? I need a box that's smaller than a standard, but don't need one that's SO shallow. Hoping there's ...
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1answer
51 views

Do I need to replace the junction box when changing LED downlight

I have 4 LED downlights in my bedroom that I want to swap out for some internet enabled ones. I wasn't the one to install them so I don't know the make/model of them. I took one out to have a look and ...
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2answers
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Does wire brought into the house have to immediately enter a box?

I need to bring in a new 220v circuit to my basement. Once the conduit enters the basement does it need to immediately enter a box like this diagram or can I just continue the wire to outlet box 20’ ...
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1answer
407 views

Code requirement that wall box be tight to drywall?

Just wondering if I need to pull out and replace an old plastic electrical wall box that sits a good 3/4" behind the drywall? Seems like you would want a tight fit for heat sealing, but is there ...
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2answers
206 views

Electrical Help: Swap 50A Range for separate Cooktop & insert Oven (30A each)

House has a 50A, 3-line service to the old Range. Want to instead have a separate Cooktop and an insert Oven located below it for a sleeker more integrated look. Each have a 30A requirement. Can they ...
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7answers
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I need 30 amps in a single room to run vegetable grow lighting. How to accomplish?

I have an 1800sf home with a 200amp service. I want to convert family room into an indoor vegetable growing room. The lighting (which will be on as much as 18hours/ day) will need 3.8amps each and for ...
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1answer
134 views

Why does this junction box cover have an “under side”?

This junction box cover is labeled "under side" on the side that is supposed to go inside the box. Why? What is different about this side? Here, for comparison, is the other side. EDIT: ...
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2answers
26 views

How do I mount a second ceiling light from the same junction box

Have an existing ceiling fixture (pendant) that is wired to a switch. I'm interested in wiring another light to the same fixture, A simple track light like this one. I understand that as per code, all ...
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2answers
650 views

Do GFCI outlets require more than standard box volume?

I purchased 2 Carlin 2-gang old work box with max cubic in fill limit of 25. These are being installed in a garage so each receptacle is gfci. I have wired them in parallel so there is a pigtail in ...
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1answer
93 views

Box fill calculation example

I have seen a few examples on here of boxfill calculations but not one where the box is directly attached to a light. So if possible please verify if these calculations are correct: 3 14/2 nm romex ...
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2answers
125 views

Why do pigtails not count towards box volume capacity

I would like to know why pigtails are not included in the volume count for outlet receptacle boxes. I recently upgraded to a two way outlet and had a total of four 14/2 wires coming into the box and ...
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3answers
475 views

Electrical Wiring - New Circuits (Added pics)

I have run two 12/2 Romex “Home Runs” to a junction box, each for 120V to Circuits A and B. T-off at the junction box, two 12/2 Romex lines split to one 2-gang box, and two more 12/2 Romex lines split ...
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1answer
68 views

Ceiling Light Installation: Junction Box or SLIM Led Driver Differences

What are the advantages/disadvantages between using a Junction Box Ceiling Light Installation or a Slim LED Driver box installation? My ceiling has space to incorporate either option. I am wondering ...
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1answer
56 views

Wire termination under cabinet

When I moved into my home, there was an ancient under-cabinet fluorescent light fixture over the kitchen sink, which I promptly removed. The fixture was just mounted to the cabinet, no electrical box, ...
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1answer
131 views

How to align electrical boxes/plugs?

A wall of a second-floor full bath (in TX) has the following outlets. The middle box is for a phone wire! I plan to remove this box. This box is nailed to a 2 by 4 above it that is running between ...
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2answers
43 views

Electrical box fill calculation

Take a look at picture of 2 switches , both are for single gang only (except left one is dimmer switch). As per NEC single pole switch device has fill volume of 2. My question is, switch on the left ...
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1answer
53 views

Tips for getting cables through old work box knockouts and into wall

I’m replacing a botched 3 gang switch box (formerly consisted of two incompatible boxes together, cover plate did not fit right). I have clamps on all my cables and am ready to put them through the ...
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1answer
32 views

Calculate box volume needed with light

I think I know the calculation for this gang box, but I want to double check. Specifically, does the light count as a "yoke"? This is a 15A circuit. Per my other question (Calculate ...
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1answer
223 views

Maximum number of wires allowed for junction box

Please take a look at attached pictures of my can light junction box. Outside says max 8 14 AWG conductors. It also says 10 cubic inch is J-Box volume. Inside, there are 3 push in connectors (for hot, ...
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2answers
86 views

Can I use metal knockout for additional NM cable?

My can light junction box has 2 black clamps for NM cables and there are 3 metal knockout holes on 3 sides of junction box. (Picture shows one of these 3 knockouts). Given the location of LINE wire ...
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2answers
76 views

Is a junction box required in my situation?

I’m moving my vanity light fixture (from where it was on the left to the hole on the right), and the cable is just barely too short to reach the new location (in particular the ground wire). I’m ...
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1answer
57 views

Through wall to surface mount box?

I've got a surface mount box mounted to the drywall. I now want to run an outlet to the adjacent room on the other side of this wall, but not directly lined up with the existing box. Is there any ...
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3answers
141 views

How should I connect a light fixture to this box with four cables?

Can anyone tell what is going on in this box? Why are there four plain copper wires? Why is there only one red wire? What is the purpose of the brown bundle of wires that contains a black, white and ...
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5answers
3k views

Removing knockouts in old work metal boxes

I recently had an existing old work box (metallic, installed with the supports that look like 'F') where there was a cable coming in from the top and another from the bottom. I wanted to add a third ...
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2answers
2k views

How to remove junction box that is nailed on?

I just bought my first house and I am trying to update some light fixtures in my kitchen. I’m also fairly new to this DIY stuff, so keep that in mind if I’m not using the correct terminology. When I ...
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3answers
66 views

Light fixture opening is too wide for baseplate

I'm trying to Install a new light fixture and it comes with a circular base plate. However the junction box does not line up flush with ceiling. So when I attach the base plate it ends up being ...
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1answer
99 views

With circuit off, why would neutral wires spark and lights on a different circuit flash?

70 year old house with a breaker panel that was upgraded from fuses about 20 years ago. A couple new circuits were added at that time for the kitchen and laundry room, but the wiring in this ...
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5answers
3k views

What are the dangers of hidden boxes?

I've been remodeling my 1924 house, and have been slowly re-wiring, and splitting up an old "mega circuit" where half the house is all wired into one circuit. In the process of doing so I ...
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0answers
47 views

Wireway or pull-box size for 2" conduit and 1/0 wire

I need to figure out what size box to mount in the corner where the wall meets the ceiling (actually, a soffit) inside my garage. I'm going to have one 2" conduit entering from the top, carrying ...
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1answer
84 views

12/3 cable coming from box, is this correct?

I have the following junction box: The cable coming from the left is from the fuse box, it's 12/3 (aluminum). The cable going straight down is going to a switch (it's 12/2, aluminum). The other cable ...
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2answers
59 views

Weatherproof junction/extension box with 8AWG wiring - selection and mounting problem

I am trying to install a simple surface mounted junction box, in terms of the Code it seems pretty straightforward, but have run into several practical problems. Thought I might as well ask more ...
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0answers
45 views

Ceiling Fan wiring and install

3 main questions. I am trying to replace a light fixture with a ceiling fan/light combo. I've read that some boxes are not rated for ceiling fans. How do I find out and/or can you tell from my pic? ...
2
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3answers
131 views

Octagon box wire access point

I’d like to run the wire into the octagon box from the “top” (in the knock out with the pencil in it). However, the way the wire clamps on the inside are designed would suggest it is not ideal ie, ...
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1answer
121 views

What are my options for getting this mess of cables under control?

I’m trying to fix this ugly condition in my old house. I understand that a lot of what’s happening here isn’t code complaint, probably in many more ways than I’m aware of. This picture shows the ...
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1answer
145 views

Found neutral and ground feed twisted together in a junction box. Safe to fix?

I recently found that the neutral bar and ground bar in my home's subpanel have no resistance (0 ohm) between them (when the neutral feed to the subpanel is disconnected). I root caused the symptom to ...
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1answer
269 views

Is it safe to do a three-way splice in a single gang junction box?

I'm splitting a room by adding a wall into it, and I would like to put receptacles into the new wall. I'm trying to do this making as few holes in the existing walls as possible, so I'm wondering if ...
2
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1answer
50 views

Connecting modern dimmer to two-wire junction box

I just bought two "smart" dimmers to replace some older ones. We have two different ceiling fixtures. The old switches only had two terminals, and both switches were tied together on one of ...
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1answer
281 views

Calculate electrical box volume needed

I am replacing some 15A 14/2 outlets. All went fine except the last. I think the box is not large enough. (3) 14/2 coming into the box; one is the live the other two go to other outlets All grounds ...
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1answer
121 views

Mount ceiling fan box to underside of joist

I want to install a ceiling fan outside under a porch. I would run new conduit up to the underside of the ceiling joist. The joists are covered by bead board which I could cut away from the joist. I ...
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1answer
100 views

Should I replace ELV 12V transformers with LED drivers?

I have 3 pendant lights, each with its own ELV 12v transformer stuffed into its junction box, controlled by a Lutron MA-PRO dimmer that supports ELV, MLV, LED, and incandescent lighting. I would like ...

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