Questions tagged [junction-box]

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

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Mounting lug to junction box

I need to bond 10 ga stranded EGC to a metal junction box. I’d like to use something like this lug. The box will be screwed to a floor joist in the crawl space under my house. Does this lug need to be ...
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3 votes
4 answers
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Does NEC require junction boxes to be accessible without tools?

I’ve seen a few posts here – including one on a question I asked yesterday – that say junction boxes and the like need to be accessible without tools. The “without tools” requirement is clear in the ...
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3 answers
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Can I connect 2 metal boxes to give me required box space?

Block construction home. Only about 1.5 inches clearance between back of drywall and block. Existing three gang box cannot accommodate deeper switches and wiring. I can take one switch out of the ...
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How to install an LED light fixture to a ceiling that only has 5 cm. hole without any junction box?

My apartment has concrete ceilings and the space for light fixtures is just 5 cm. diameter hole. I am looking at installing new lighting fixtures (pictured above). The fixture in question comes with U ...
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Attaching a 24v door bell transformer to a plastic box

I am replacing a doorbell transformer, upgrading to 24v because the new doorbell is a Ring doorbell. The existing transformer is 16 volts. It was ganged onto a plastic (on the outside) of a receptible ...
2 votes
1 answer
105 views

Permissible to install 90 squeeze connector to a junction box face plate?

Installing a residential wall oven metal flex conduit to a metal junction box that is recessed flush with the drywall. Is it permissible to attach a 90 degree squeeze connector to the box cover plate ...
10 votes
4 answers
3k views

What is this "loose faceplate ring" and is it something that should be fixed?

I was hoping to replace an old yellow faceplate for a coaxial connection with a nicer white one, but when I took off the faceplate I was greeted with this sight: I can only imagine that the cable ...
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3 answers
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Surface mount electrical box

Had a box with outlet inside cabinet. The cabinet has been removed, however I still want to have an outlet. My problems: I can’t recess a box into the wall, because there’s an old brick fireplace 1” ...
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1 answer
107 views

Interesting electrical ceiling box with downward pass through bolts

I'm trying to mount a heavy ceiling fan but ran into a unique ceiling box I've never seen before. Two bolts come down from the metal horizontal piece and pass through the plastic box. This was the ...
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Why are there 3 cables going into 2 switch electrical box

Three main cables going into this 2 switch junction box. Going to move the switches up 6” and don’t understand why there are 3 main cables going to this box. There is an outlet below and to the left ...
1 vote
0 answers
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How to remove the "knockout" from a Carlon PVC outdoor box?

I purchased an outdoor GFI plug and box combo at Home Depot (Canada). The instructions I saw online talked about the inner box being metal and that you simply unscrewed the cap over the box hole you ...
1 vote
0 answers
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Covered patio junction box requirements

I'm in Florida and completing a covered patio project that extends my current roof over the patio. The ceiling height is 9'. I'm looking to extend the existing outdoor circuit that is GFCI protected ...
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How to adapt 12-2 ceiling light circuit to LED light fixture's smaller guage push in WAGO connectors

I am replacing an older incandescent fixture that had a box in the ceiling with wire nuts connecting to the 12-2 romex in the box. The new fixture is an LED with integrated JBox. There are "WAGO&...
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2 answers
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Are there any locations for electrical boxes relative to drywall seams that cause trouble for drywalling?

I am going to hang and mud some drywall in a small basement remodel. I have limited experience with this - I am not expecting it to come out perfectly, but I hope for decent results. When planning ...
1 vote
1 answer
56 views

What is a robust code-compliant method to connect EGC wires in a weatherproof outlet box in a wet outdoor location?

Background: I'm updating an outdoor garage wall single gang electrical outlet that's 2-wire ungrounded installed perhaps 70 years ago. I only have access to the outside of the wall. My plan: Remove ...
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1 vote
2 answers
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Are galvanized or stainless machine screws OK to use with field-tapped holes in aluminum castings (outdoors, wet)?

I'm installing some weatherproof cast aluminum junction boxes outdoors (full rain/sun exposure) for a GEC run, and would like to drill/tap additional holes in them to mount brackets etc. Do I need to ...
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2 votes
2 answers
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Junction box for furnace fuse reads hot with NCVT, but the furnace operates normally. Is this dangerous or incorrect?

Location: United States, Colorado While diagnosing an unrelated electrical issue during renovation, I discovered that the junction box containing a fuse and switch, which provides power to my furnace, ...
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1 vote
1 answer
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Can I use a plastic extension ring over a metal switch box and self-grounding devices?

If I use a plastic extension ring over a metal switch box, and if the metal switch box is correctly grounded and I use self-grounding devices with long screws screwed into the metal box, can I ...
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How to extend an outdoor single gang electrical box to a 2 gang electrical box

I have a single gang electrical box on an outside wall of my home. I need to expand it so it can house two GFCI outlets on separate circuits. I have been looking for an extender with an opening in the ...
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1 vote
1 answer
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What connector to use for 3/8 AC/flex to metal weatherproof junction box in exposed outdoor location?

Background: I am adding an equipment grounding wire (bare 10 gauge copper) from my electrical panel (in-wall mounted with access door to outside only) outside along about 10 feet of painted exterior ...
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3 votes
3 answers
783 views

Is my non-standard outlet box grounding screw code-compliant? (US in 2022)

I'm installing GFCI outlets in my 1950s era existing kitchen counter wall boxes. The metal boxes in the wall have a number of holes in them that I thought were for standard green grounding screws, but ...
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4 votes
1 answer
364 views

Black/black/black/green wires to black/red/white/green - how to figure which one to which?

There is a line for a hot tub that I am trying to reconnect. Hot tub side has black, red, white and green wires. Power supply side has three black and one green wires. The green was previously ...
1 vote
1 answer
51 views

What is correct mud ring size for ceramic tile?

With a square box installed flush with studs, 5/8 cement board and ceramic tile if I want the mud ring perfectly flush, should I use a 3/4 inch one?
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9 votes
4 answers
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Best way to cover exposed THHN cables where conduit has been pulled out

There's a set of exposed THHN cables before they enter a junction box below my home's load center. The wires are currently capped so I wanted to know what the risk was of having this gap when/if the ...
2 votes
2 answers
108 views

30 amp extension cord with 15 amp outlets

I have a 30 amp RV outlet in my garage that I want to use to power a couple of 10 amp battery chargers. The battery chargers have 15 amp plugs. I'm thinking of getting a 10 gauge copper cable, ...
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6 votes
5 answers
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Replacing an outdoor PVC junction box where it rains a lot

There is a PVC conduit running under deck with a line for a hottub. It lies right on the ground. There is a junction box, which also lies on the ground with its cover up. It rains a lot here. (See ...
3 votes
2 answers
160 views

installing ceiling fan on old pancake box

Just bought a home built in 1945. Wanted to hang a ceiling fan where an old light fixture was. I am ignoring all the non-functional wiring. I purchased a ceiling fan rated box with brace from which to ...
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0 votes
3 answers
223 views

Does the NEC recommend metal or plastic boxes for 240V? [closed]

I need to install a junction box for 240V going to two separate Thermostats for baseboard heaters (one 750W and another 1100W). Should I use plastic or metal boxes for the thermostats and junction box?...
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1 answer
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Junction Box fill assistance

Does this meet box fill requirements? Two, three-gang boxes stacked vertically using a 3/4" x 1-1/2" conduit nipple. Total of seven cables and 6 devices plus a pair of wires through the ...
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0 votes
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Pros and cons to "new work" box vs junction box with mud ring in new construction

Putting drywall on studs, I can add switches and outlets using New Work boxes that stick out from the studs or I can use a plain junction box and add mud rings. Are there any pros or cons? For me, ...
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4 votes
3 answers
209 views

How to secure loose new-work metal junction box

I have an old 3-gang metal junction box that is nailed to a stud on one side, via the "new work" straps above and below it. No other part of it is fixed to anything, and it has become a ...
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Flex metallic conduit touching drywall

I'm installing a new receptacle to power a wall-mounted TV, it is feeding from an existing receptacle on the other side of the wall. The existing box has 2 cables coming in from the top, and I believe ...
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9 votes
5 answers
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How do I fix an outlet where the junction box falls into the hole and the wires are too short?

First, this outlet is in what was once a balcony. The drywall was placed over stucco so there's about a 1/2 - 3/4 inch of stucco followed by a gap (1/2inch ish) followed by 1/2 drywall. The original ...
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4 votes
1 answer
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How should I repair a nicked wire in a junction box?

I was using pliers to pull my cable a little bit further in to the blue junction box so that I would have some Romex insulation sticking into the box, but in the process managed to make a small nick ...
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1 vote
1 answer
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Broken ceiling junction box in a condo

I've recently removed the light fixture in my kitchen / breakfast area in a condo (ceiling is NOT drywall, as far as I can tell). I got a new fixture that I want to install but it weighs around 6 ...
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3 answers
256 views

Wires don't quite make it to the junction box for an outlet

I need to move an electrical outlet to the next stud over. There's almost enough slack in the wire to pull that off, but not quite. If I install the junction box as is, the outlet will be almost to ...
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1 vote
1 answer
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I am converting an existing fuse panel to a junction box. How do I connect to the new service panel?

This is a tri-plex in central washington with outdoor fuse panels where I plan to use a multi meter pack and install outdoor 125 amp panels. I found another post titled "How do I convert a ...
2 votes
2 answers
333 views

Trying to replace a vanity light when the old one was mounted with a vertical brace behind the box

The electrical box behind the old vanity light was mounted with a junction box connected to a wall brace between studs. Because of this, the holes on the junction box were at an angle, not horizontal....
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1 vote
0 answers
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Light Fixture, Fan and GFCI share supply, all function except Light Fixture -- unless power is consumed via GFCI

I have concerning behavior from a light switch and GFCI outlet. I apologize for the length, I'm trying to be thorough as I have a pretty good understand of how wiring should work, but it's...not...So ...
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1 vote
2 answers
248 views

Fix/Replace a Small Knockout

In my latest home electrical adventure, I wanted to add another receptacle pulling power from a receptacle lower on the wall. All kinds of problems along the way (e.g., hot/neutral reverse). The ...
0 votes
1 answer
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How to ground circuits when using a receptacle as a junction box for another circuit

I'm renovating my basement. Part of the renovation requires rerouting some wires. I have en electrical box that is going to act as: a duplex outlet for circuit 1 a junction box for circuit 2 Circuit ...
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1 answer
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Can I remove mounting tabs from this gang box?

I need to install a 5-gang, old work box. This is the only one box available. Should I just cut off the piece that gets screwed to the face of the 2x4 or notch out the drywall and fix? I think the ...
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3 votes
1 answer
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Can I install a ground bar in an 8x8 junction box for splicing cables?

I had a sub panel put in a few years ago but recently upgraded our panel. My county inspector said I could splice the short wires to get them inside the panel. I bought a box and I have 8 circuits ...
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8 votes
2 answers
2k views

Do my junction boxes need to be behind a backsplash or flush with it?

Recently had a quartz backsplash installed and was told the electrical boxes are to be BEHIND the backsplash. In other words, the electrical outlet would sit flush with the wall, without an electrical ...
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2 votes
1 answer
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Drafty light switch box on exterior-facing wall

Is this an example of shoddy contracting and/or building code violations for a house built in Tennessee twenty years ago? exterior facing wall light switch, no fire caulk on edges/holes, w/ cold draft ...
4 votes
3 answers
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Properly grounding junction box for conduit transition

I just want to confirm I have my wiring down correctly. I live in the US (upstate NY) which is under NEC regulation; no local code regulations added on top of NEC. I am installing a new outlet (120V/...
1 vote
1 answer
87 views

Repurpose Electrical Junction Box Knockouts Sizes

I have a metal electrical junction box with different size knockouts. Can I repurpose the larger size knockout by drilling a smaller standard hole within the same larger knockout? I need additional (...
2 votes
1 answer
577 views

Is there a good way to get 12v into an electrical box?

I have a bit of an odd situation. I have a standard outlet (120v, 15 amps, just a normal United States receptacle). I'd like to run some raceway conduit up from the outlet*. At the other end of the ...
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1 answer
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Matching outlets to junction boxes and their covers, by example

Please note: Since creating this question, several community members have explained to me that since I'm running 12/2 and 10/3 I will have a grounding wire and so the electrification concern I ...
2 votes
1 answer
80 views

Installed new switches - ground wire connection touches wood?

I ended up swapping out all three switches in my box. The two new dimmer switches are not the same design as the old and these have the ground wire woven through holes in the metal base. (See photo) ...
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