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Questions tagged [junction-box]

A junction box is a container used to enclose electrical connections (junctions). Use with the [electrical] tag. Use with [wiring] if your questions involves wires.

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4 votes
3 answers
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Proper way to extend circuits to subpanel

I would like to move 8 x 20A circuits (room lights, ceiling fans, outlets in the bedrooms, and living room), and 1 x 50A (AC) circuit from left main panel to the right sub-panel. The sub is a "...
utdrmac's user avatar
  • 141
0 votes
0 answers
39 views

When an electric oven junction box needs to be relocated can a whip be run from the old box under US NEC 2014?

Our double wall oven went kaput and had to be replaced. Discovered today that the new oven and the old oven (same manufacturer) want the junction box in different locations. Is it code-compliant (NEC ...
mr blint's user avatar
  • 1,870
2 votes
2 answers
171 views

What is the best way to terminate wires formerly connected to a 240V in-wall heater?

This is what my old wall heater looks like. I want to remove it, but I want to safely terminate the two white wires (top left of picture). There's a conduit on the outside of the house with access ...
milesmeow's user avatar
  • 5,082
1 vote
1 answer
45 views

How to patch the drywall around this jbox

I need to patch the drywall around this jbox for my electrician to put in a new outlet. But I’m unsure how far to go in with the drywall and the best way to attach such small pieces.
Leica5757's user avatar
0 votes
1 answer
114 views

Why did a wire short to the metal junction box without tripping the breaker?

I opened up a junction box to reconfigure two switches. I turned the breaker off and unscrewed one switch and all of its wires. The hot, neutral and ground were separated so they wouldn't touch. I ...
milesmeow's user avatar
  • 5,082
2 votes
2 answers
913 views

Daisy chain neutral

I want to replace a standard light switch with a smart switch which requires a neutral wire. The box has a neutral bundle with 6 wires already. Can I remove one of the neutrals, connect it with a ...
Dave's user avatar
  • 23
0 votes
1 answer
67 views

Can the hardwire run behind the dishwasher to the junction box in the next cabinet?

I am replacing a Bosch 100 series that is hardwired at the front of the dishwasher with a Bosch 500 that required a junction box. My dishwasher cabinet is against a wall and the hardwire comes out of ...
Ashlie Hazen's user avatar
0 votes
2 answers
58 views

Can I put a junction box between the panel and a GFI?

I want to put a junction box between the panel and a GFI on a 15 Amp designated circuit. Any issues with this?
Andrew's user avatar
  • 3
0 votes
0 answers
38 views

Junction box on 1x2 running board?

Is it kosher to put junction boxes directly on 1x2 running board, like this? It doesnt look right, being wider than the running board. Also looks like the running board should be further away so the ...
AmateurInspectorIGuess's user avatar
5 votes
3 answers
3k views

Does every single ground wire in a box have to connect to every other ground wire within the confines of that same box on one branch circuit?

I have a 3-gang plastic box with six conductors that enter the box; three line-side, three load-side, and they pass through the three switches in pairs of two. The load-side wires are all on the same ...
Ryan Mortensen's user avatar
0 votes
2 answers
87 views

Drill hole to mount metal junction box

I am trying to install a metal junction box behind existing drywall. I cut a hole in the drywall next to the stud, and want to screw the left side of the box into the stud, but the holes that are pre-...
Daniel's user avatar
  • 179
4 votes
1 answer
662 views

Does the NEC allow chaining wire connectors within a single junction box?

In this box, I have a green ground wire nut with a through-wire connected to the metal box ground nut that connects it to four other ground wires on conductors entering the box. I connected three more ...
Ryan Mortensen's user avatar
2 votes
0 answers
46 views

What type of cable clamp should be used with this box?

What type of cable clamp should be used with this box? The diameter of those knockouts is roughly 5/8", which I think makes them 3/8 knockouts - does that sound right? If so, do they make cable ...
tom's user avatar
  • 384
1 vote
1 answer
44 views

Is a 1/2" deep pan junction box mounted to OSB for garage light bulk (lamp) socket up to code?

I have a house with an attached garage. On the garage wall that faces the interior of my home is a porcelain light socket with a light bulb screwed in that is switched on and off by a switch mounted ...
acker9's user avatar
  • 113
3 votes
5 answers
1k views

How do I remove an outdoor electrical metal box?

I can't disconnect this old metal box from the metallic conduit that is behind it. From the pics you can see I was able to remove the old rusted fasteners and replace them with new ones. However I ...
Goxoa's user avatar
  • 89
12 votes
2 answers
2k views

Does NEC allow a metal box to carry the ground connection between separate conductors?

I found this box: You can see that most of the conductors have their grounds crimped together in the deep part of the box. A box extension was added to this at some point, so it is rather deep, but ...
Ryan Mortensen's user avatar
0 votes
1 answer
36 views

Two pass through or spliced circuits in one box

I have a 3.5 inch metal octagon junction box with 5 12/2 wires coming in. This is how they are wired. 1 is spliced and goes out but the other has 2 splices and both go elsewhere. Both are on their own ...
cde's user avatar
  • 726
0 votes
2 answers
84 views

How can a round ceiling junction box be installed as new work with 5 layers of drywall and no demolition?

I have an 80-year-old house, and the ceiling is 5-layers of drywall thick from work performed before I owned it. I need to install two junction boxes, and one of them is in an area I cannot access ...
Ryan Mortensen's user avatar
1 vote
1 answer
97 views

Junction box from main to subpanel - what to do?

I am doing a DIY 400A service upgrade and I would like to get some vetting on my work before the utility connects it and the city inspects it. The meter/main combo is outside behind this wall of the ...
Alessio Sangalli's user avatar
5 votes
1 answer
472 views

How can I change the placement of an exterior light?

I have an exterior porch light with associated junction box located very near the trim around our sliding glass door. The height of this light and junction box are not optimal for lighting a broad ...
Bauerfeind's user avatar
0 votes
0 answers
67 views

Code-compliant way of permanently wiring a hidden 120v appliance

I'm finishing my basement and want to install an inline booster fan for one of the bedrooms. The fan will be accessible by removing a rain shower head in the bathroom, since the duct runs right above ...
Egor's user avatar
  • 519
0 votes
0 answers
98 views

How can I transition NM cable (coming out of drywall to peninsula cabinet) into conduit with THHN wiring for the peninsula outlet?

I have a roll of NM at the end of one of the (currently inactive) 2 kitchen circuits, which the electrician left for peninsula wiring. NM is coming out of drywall, under the counter, going directly ...
JCott's user avatar
  • 1
4 votes
1 answer
632 views

How to mount EVSE to existing box on exterior wall?

I currently have a (completely miswired) TT30R in a metal box and metal conduit on the exterior wall: The wiring is 2x6AWG for hot and 2x10AWG for neutral on a (currently) 40A breaker. So I have ...
divB's user avatar
  • 1,401
0 votes
2 answers
81 views

NEMA L5-30R in a 4 inch box

I need some help. Is there an adapter for 4 inch box, to install single gang NEMA L5-30R receptacle. Also, is there a cover for it? I need to install NEMA L5-30R for our 120 volt, 30 amp, APC UPS.
IgorK's user avatar
  • 314
0 votes
2 answers
304 views

Can I install a junction box on top of a wooden stud?

I’m updating my vanity light in the bathroom because it’s off center. Where the center line is, there’s a wooden stud. I’ve bought one of the thin circular junction boxes, the ones usually meant for ...
Louisa's user avatar
  • 1
10 votes
2 answers
3k views

OK to remove sheathe and have some wires bypass box?

We are installing a 3-way switch, light between switches and power into light. The light is a LED pot light. The light sits in a drop ceiling with lots of access. We don't really need to cut the red ...
Catherine's user avatar
  • 211
2 votes
1 answer
58 views

Terminating Unused BX Cable in Place

I have an unused BX cable with power to it in my former coal cellar of my 1925 house. The main panel has been upgraded and has Romex wire. I planned to cap the ends of the BX in a metal junction box ...
Pittsburgh's user avatar
3 votes
1 answer
193 views

Removing Junction Box with extra wire

I've removed a few junction boxes to install recessed lighting however this one is giving me an issue. I have attic access and used it to get the junction box detached from the studs and ready to move ...
Darnell Welcher's user avatar
7 votes
3 answers
1k views

Best, and acceptable, connector for 12 to 20 ground wires in a junction box?

In a junction box with about 12, and may grow to 20, cables of size #14, #12, #10 what is the best, and alternative connectors to join all the ground wires together? Can I install a ground block, the ...
jay613's user avatar
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4 votes
3 answers
1k views

Can low voltage bracket be installed next to existing receptacle to accommodate a two-gang faceplate?

Can a low voltage bracket like this be installed next to an existing single-gang box such that it supports a single, standard 2gang faceplate? Is there anything specific to take care or any product ...
divB's user avatar
  • 1,401
0 votes
1 answer
63 views

Smoke alarm relay (high voltage and low voltage) in junction box?

I have First Alert hardwired smoke alarms, and I'd like to add monitoring output to my home automation using their RM4 relay, a simple dry-contact relay that activates from the smoke alarm's data ...
Grunthos's user avatar
  • 1,482
0 votes
2 answers
102 views

Junction box cover required for a non-light ceiling device, and if yes, which one?

I am installing one of these infrared heating panels hardwired on my ceiling. My plan is to put a junction box into the ceiling (same size as a ceiling light), located underneath the panel. The wire ...
divB's user avatar
  • 1,401
0 votes
1 answer
89 views

Proper grounding of old fuse panel now turned J-Box

I am working on my old house from the early 1900s. It has 100A service, a 6x15A FUSE panel that was turned into a sub panel powered by 2x 20A circuits from a small "newer" 100A breaker panel....
Dentpusher's user avatar
6 votes
3 answers
1k views

What is this exterior electrical box and how do I cover it properly?

I'm the new owner of a 1956 Southern California home and discovered this curious plate on the stucco exterior: It's above, and to the left of the front door. There is a working sconce mounted above ...
swrobel's user avatar
  • 215
1 vote
1 answer
80 views

Can I fix a 1-gang steel box at the bottom onto a horizontal beam with a spacer?

Usually metal boxes are attached to vertical beams ("studs") in the wall. I have an opening in a lath & plaster wall with a horizontal beam just about 1/2"-1" underneath the ...
divB's user avatar
  • 1,401
2 votes
1 answer
206 views

Variable spacer for mounting metal boxes in old work

Every other answer to a question that involves electrical boxes references the advantage of metal boxes over plastic (old work) boxes. It is claimed that they are very flexible to mount but I don’t ...
divB's user avatar
  • 1,401
2 votes
1 answer
126 views

Why are the box fill on Carlon boxes inconsistent/wrong?

This is a side question to Box fill calculations for a light switch in a Carlon old work box because I realized what is written on the Carlon old work boxes is possibly wrong or at least inconsistent. ...
divB's user avatar
  • 1,401
0 votes
2 answers
196 views

Box fill calculations for a light switch in a Carlon old work box

I thought I got the box fill calculations right but there must be an issue, still. Because, assuming my calculations are correct, no single box on the market would be large enough for a simple light ...
divB's user avatar
  • 1,401
0 votes
2 answers
104 views

Most future-proof j-box/light for closet

I have a normal, small closet (approximately 46”x24”). I am doing electrical work and on that occasion I’d like to add some light to the closet. I was thinking just adding a normal j-box (e.g. Carlon ...
divB's user avatar
  • 1,401
0 votes
1 answer
118 views

How to remove this pancake box?

I know this is a well-trodden question here, but, as per usual, there doesn't seem to be an exact example of the particular fixture that's been previously asked. I'm trying to install a ceiling fan ...
thebenjaminp's user avatar
4 votes
3 answers
239 views

My electrician left a spliced cable outside a junction box. How big a deal is this?

I'm having some electrical work done to run existing lines through the joists so we can hang drywall on the ceiling. Some of the existing cable runs were too short so the electrician added a larger ...
TheDandyLion's user avatar
10 votes
4 answers
3k views

What is the proper way to remove a receptacle from a wall?

What is code or proper way to remove a plug receptacle from a wall? If the plug has 2 black wires and 2 white wires, can the respective wires be connected together with wire nuts and tape then pushed ...
Bill's user avatar
  • 101
0 votes
0 answers
90 views

Stripped screw on fiberglass electrical box

I made the never-again mistake of using a few fiberglass electrical gang boxes on my recent remodel. It seemed like fiberglass would be better than the plastic boxes, but I learned my lesson there, I ...
5000fingers's user avatar
2 votes
1 answer
1k views

Add Junction Box for Double Oven

California house built in the 1960s. Here's the existing junction box for the ovens. Ovens are busted and needed to be replaced Right away, I am confused: Red looks like 8 AWG Black, White look ...
user3533030's user avatar
0 votes
0 answers
39 views

Hanging light from pancake junction box

I’ve been slowly replacing the light fixtures in my home, and each one is completely unique (the joys of owning an old home). I’m not seeing a spot to mount the crossbar on my new fixture to in the ...
Meghan's user avatar
  • 1
1 vote
2 answers
382 views

50 Amp plug but 30 amp breaker

I have a plasma cutter which can have 35 amps of 220 draw. The factory plug is NEMA rated for 50 amps, 220V single phase. My circuit is rated for 30 amps. I never intend to go above 30 amps when ...
Paul C's user avatar
  • 11
0 votes
1 answer
52 views

Can you wire something in parallel to a light switch?

I’m looking to wire a Ring motion camera to the roof overhanging my garage to replace my old Ethernet driven camera. The easiest access wire that I can see is attached to a switch in the attic. I don’...
Niko's user avatar
  • 123
1 vote
2 answers
51 views

What is the right box fill for my 1x30A circuit and 2x20A circuit case?

Box fill calculations are so frustratingly ambiguous and confusing. I have the following setup: A 30A dryer circuit along with 2x20A circuits comes via FMC from panel The dryer (3x8AWG) passes ...
divB's user avatar
  • 1,401
3 votes
3 answers
394 views

Which small (1-gang) surface mount box is code compliant with NEMA 14-30R receptacle?

I would like to install this NEMA 14-30R in a surface mount single gang box for my dryer. Can I put it into this box? The box has 19 cu-in. I am not proficient with fill calculations but 3x10AWG + ...
divB's user avatar
  • 1,401
1 vote
0 answers
240 views

How do I mount a junction box behind a vinyl mounting block?

What type of box do I use to get the junction box flush with the mounting block?
Evil Elf's user avatar
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