Questions tagged [conduit]

Electrical conduit is used to protect electrical wires, when a simple jacket alone is not enough. Conduit may be metal or plastic (PVC). Use with the [electrical] tag.

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What types of conduit would be appropriate to extend a circuit inside a storage bench?

The existing condition has a built-in banquette (bench) with hinged seats so that the interior space is accessible for storage. There is a wall-mounted receptacle inside the bench. Because of the ...
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4 votes
2 answers
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Marking 3 circuits in one conduit where 1 circuit originates in a different panel

I have a main panel (200A and an adjacent subpanel that was installed when an addition needed more breaker spaces. The work I am doing is on the interior of the garage's concrete block wall. The ...
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Anyone knows what type of conduit/duct/hose this is?

I have been looking everywhere for this hose. I don't know what it's called because it's very uncommon in our country. Tried searching for semi-rigid duct but it's not exactly what I'm looking for. ...
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Replacing wire in EMT in old house; should it be replaced with THHN/THWN?

I have an old home where most of the branch circuits are fed by pre-1950s cloth insulated wiring running through 1/2" rigid EMT. I am considering replacing the old wiring with new wiring. If I ...
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4 votes
1 answer
123 views

Would knob and tube be used with modern conduit wiring?

Recently bought a single story house that was built in 1925, it has a basement and an attic space. I've doing some updates in it, and have noticed some confusing things with the electrical wiring. ...
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4 votes
2 answers
70 views

PVC electrical conduit vs. PVC for plumbing [duplicate]

What's the difference between PVC electrical conduit vs. PVC plumbing? Can they be used interchangeably?
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3 votes
3 answers
378 views

Do I need PVC expansion coupling with a 130F temp range but very short run?

I am doing a very short run of a 2 inch PVC conduit on an external, west-facing, brick wall. The conduit exits the panel horizontally, travels 28 inches, turns 90 degrees south and travels 36 inches ...
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9 votes
3 answers
2k views

Does wiring under a waterproof deck need conduit?

Just finished my deck and installed the Trex Rainescape waterproof system. Planning on wiring it up and finishing it with come cedar ceiling planks. Since this setup is waterproof, do I need to use ...
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0 votes
2 answers
51 views

Pulling wire through Sealtight/LiquidTight?

I'm going to make my final run from my 50 amp hot tub panel disconnect to the hot tube using about 20' of 3/4" Sealtight/LiquidTight. Is there a best way to pull 4 #6 wires through this type of ...
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1 answer
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Conduit fill for (slotted) wire ducts?

Table 1 of chapter 9 of the National Electrical Code (of the US) allows us to use up to 53%, 31% or 40% (and 60% in some cases) of the cross-sectional area of a conduit or tubing (EMT, PVC, etc.), ...
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5 votes
2 answers
1k views

Where to land ground in main panel

If one were to add a new branch circuit to this panel and didn’t want to use metal conduit, where would you land your ground wire to? Would you need to add a grounding location to the panel?
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9 votes
4 answers
940 views

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 ...
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6 votes
5 answers
2k views

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 ...
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3 votes
2 answers
157 views

Should I terminate individual conductors exiting conduit or run all the way between panels?

I need to make a run from my detached garage to my house. The run exits the garage by way of an LB, runs underground for 25ft in 1 1/4" Schedule 40, then enters the house through another LB. From ...
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1 vote
2 answers
87 views

Best way to align cast-in-place conduit to desired box location

So I was close when I cast this 3/4" sch40 PVC in concrete - but not close enough! I'm roughing in an 110v electric radiator here with a single run of 12/2. Where I want the box to interface with ...
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0 votes
1 answer
67 views

How to correctly tie in electrical lines to Tankless WH

I installed this electric tankless water heater a few years ago. It is the Eco Smart 18. We are now trying to sell our house and the inspection has advised that the electrical lines be run in conduit. ...
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2 votes
0 answers
69 views

What is the best way to run a circuit over a 3' concrete block wall (for a baseboard thermostat)?

I'm installing a Mysa wifi line voltage thermostat to control an electic baseboard heater mounted against a concrete block wall. This is in a 2nd floor detached garage, and the 2 story structure was ...
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0 votes
1 answer
38 views

Does a conduit running through a ceiling need to be supported? [duplicate]

I will be running wire through a basement ceiling (not a drop ceiling) and I would like to avoid cutting holes in the drywall. I know that the wire on its own would need to be supported and secured to ...
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1 vote
1 answer
88 views

Can a 120V circuit share conduit with 240V circuit?

I have an existing 40A circuit for my old window A/C. I plan to remove the outlet, pull wire back into basement and terminate to junction box. Then from J-box I'd run PVC conduit thru band joist and ...
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3 votes
1 answer
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How important are square pipe cuts in Schedule 40 PVC electrical conduit?

I have an electrician installing 2-1/2” Schedule 40 PVC conduit and am not impressed with the cuts that his crew are making with a reciprocating saw. Some cuts are out of square by roughly 15 degrees. ...
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2 votes
2 answers
168 views

Using primer on electrical PVC conduit

I'm putting electrical conduit underground and there seems to be mixed opinions on whether to use primer along with the PVC cement. There are videos showing the use of primer, and videos not using ...
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1 vote
1 answer
105 views

What type of cable to use for a low voltage heating element?

I have a 960W transformer, the output measured 26V. This is supplying power for an underfloor heating element which simply draws less current with lower voltage so maybe the actual power is say 750W, ...
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0 votes
2 answers
104 views

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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1 vote
1 answer
221 views

Does PVC conduit penetrating an exterior wall require a box on the interior side?

I'm running a circuit through a basement rim joist to a PVC LB connector on the exterior of the house via a short pvc stub glued to the LB connection but just free on the basement rim joist side. Can ...
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13 votes
8 answers
5k views

How do I place electrical conduit under a creek?

Short version: I need to run 4" PVC electrical conduit under a 4' wide creek where the water is usually 1-4" deep. Code in this area requires cable in conduit to be 18" deep. I do want ...
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0 votes
1 answer
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EMT vs ENT for low-voltage sprinkler solenoid control

I'm putting in a drip irrigation system controlled by 24V Orbit sprinkler valves. The control wire will have to under a deck and across the back of a planter, requiring a water-tight conduit. EMT is ...
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13 votes
9 answers
6k views

Can an incoming optical fiber cable be wired internally in a house's walls?

I am building a new home, and want to get fiber internet installed in it. In my current home, the fiber is wired externally on walls, above doors and finally into the living room through a drilled ...
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4 votes
1 answer
384 views

Can conduit be laid on the ground under a low deck?

I'm planning my run from my main breaker panel to a hot tub subpanel. all wiring will be in PVC conduit. At first, the plan was to bury the entire run. However, as it turns out I could greatly shorten ...
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4 votes
3 answers
1k views

Locating electrical conduit under walkway

I am installing a home EVSE charging station. From the circuit breaker box, there are unused conduits that lead to a lamp fixture location near the end of the driveway. I have located the panel end of ...
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2 votes
1 answer
263 views

How to join two electrical boxes through a wall?

I'm replacing a 1960s vintage sub-panel for my laundry and air-conditioner. I'm also looking to install a disconnect at the A/C compressor. The new sub-panel is inside the wall of the laundry room, ...
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0 votes
1 answer
97 views

What is the best way for pulling 3- 4/0 wires and bare ground through 2” conduit [closed]

Pulling 200 amp service from meter to panel
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0 votes
0 answers
58 views

Flat roof, where electric mains enter via conduit, leaks in heavy rain - does a cover for this exist?

I have a section of the roof on my house that is flat, and across the roof runs a conduit that carries electrical from the main panel to subpanel. In very heavy rain, water enters through a square box ...
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1 vote
1 answer
80 views

Sub panel install, conduit run behind natural gas line?

Looks for rules on whether I can run a 1" electrical conduit along bottom of house if it crosses the natural gas line? They do not touch and there would be about 3" between the 2 above ...
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1 vote
1 answer
68 views

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 ...
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1 vote
2 answers
115 views

How do I properly secure electrical conduit in a garage?

I failed an electrical inspection (State: NJ) the other day. The inspector said that because my shed could accommodate a car, the electrical conduit had to be secured better in case a car hit it. The ...
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1 vote
1 answer
146 views

Running 240v generator inlet and 240v house power outlet in the same conduit?

I'm simultaneously installing a 50A NEMA 14-50 outlet in the garage (for ev charging) and running a line for a portable generator from just outside the garage, back to the panel. I'll be using PVC ...
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0 votes
1 answer
77 views

XPS to raise subfloor?

Regarding to my old problem: Tiles above concrete, with electrical conduits I am thinking about using XPS to raise my concrete attic subfloor, so that I can bury existing electrical conduits. Details: ...
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10 votes
5 answers
3k views

How do I properly prepare stranded wire for a screw down connection?

When connecting a stranded wire to a solid wire in a wire nut (for example connecting a ceiling fan's internal wiring to the house wiring), I know that I should tightly twist the stranded wires and ...
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0 votes
0 answers
48 views

What size breaker will I need for my workshop subpanel, wire, and electrical conduit to feed it through?

Adding a subpanel to my workshop, it's less than 20' away, it's for 2 (240V Plugs), 5(120 V Plugs), and a couple of LED fixtures, nothing more.
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1 vote
2 answers
142 views

Drilling through bottom plate for conduit

Looking to run 3/4" conduit through the bottom plate of what should be a load bearing wall to get ethernet to the lowest floor in our house. I already drilled a 1" hole through what I guess ...
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1 vote
1 answer
55 views

Is there such a thing as divided conduit?

The excacator is coming to visit, and this is my opportunity to prepare for lighting, a possible gate motor, and a possible camera. I know I can't just pull both cat6 and power through a single pipe. ...
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0 votes
0 answers
113 views

Flexible conduit 1/2" to 3/4" knockout

I'm working on a residential wiring project. I'm trying to figure out how to connect a 1/2" flexible aluminum conduit to a 3/4" knockout on a junction box. The existing junction box is ...
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2 votes
1 answer
203 views

How can I extend PVC Conduit already installed?

I recently bought a house with an exterior garage. The previous buyer only had an on/off panel installed on the outside with a single Romex running to one receptacle for the garage door opener. I'm ...
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2 votes
1 answer
77 views

Underground garage supply conduit standoff

I had 100 amp underground service to my old garage. In 2” conduit PVC SCH 40, 24” trench, code USE wire size, slip joints, etc While building the replacement garage, Contractor poured the new slab in ...
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3 votes
2 answers
564 views

Does NEC allow mixing wire gauge in distinct sections of conduit when derating?

Here's the hypothetical scenario. I have two segments of conduit: Conduit 1 (Distributor), direct from electrical panel to a distribution junction box 1 Conduit 2 (Branch), from distribution junction ...
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  • 31
3 votes
1 answer
255 views

Run dedicated circuit by passing in and out of the back of a gang box

I want to run a couple of dedicated circuits in my basement. Can I pass through outlet boxes basically making 180 degrees? The wire would go in and out of the back of the outlet box. I'm in Cook ...
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3 votes
2 answers
672 views

Tee or split GFCI circuit in garage (120v) - Practical and Code question

Relevant but didn't address the GFCI part of the question: Split a single branch circuit into two runs? I'm wondering if I can split/tee/branch an existing circuit that uses wall mounted metal conduit....
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0 votes
1 answer
173 views

Exterior surface mount outlet w/ conduit through soffit

I'm looking into mounting a TV on my patio on the exterior wall of my brick home. Only problem is, the best place for it is the exterior of a masonry fireplace/chimney, so I can't drill through the ...
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0 votes
2 answers
87 views

Which conduit to use

I'm installing a 220 volt 30 Amp plug for a scuba compressor. I'm installing it my sun room. There is a hole in floor trim already from the old heating system so I was planning on using that. Run ...
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0 votes
1 answer
118 views

How can I run cable from a solar inverter to a cupboard room where my consumer unit is situated?

The cupboard room is not next to an external wall, about 5 metres into the house. The power to the house comes in through a conduit, quite large, more like a drainpipe, about 5 inches in diameter. ...
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