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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URD Service entrance cable for tankless hot water heater

I'm planning on running 2-2-4 URD service cable to a tankless hot water heater. It's a long story, but I have to run from an outside load center underground and through the subfloor of a building ...
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2answers
5k views

Is a conduit required or recommended when running SER wire in unfinished space?

I'm planning on installing a 100amp sub panel in the garage. The garage is right around the corner from the main load center in the basement, but part for that path goes through the stairway from the ...
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1answer
71 views

Running a dryer outlet to garage

Planning to Run a dryer outlet from outside service panel along the exterior wall approx 45 feet before entering the garage. What will be the correct size wire and conduit type to use?
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39 views

In Wall Panel for Security System and Camera Cabling

I'm in the process of overhauling my home network and installing some door and motion sensors. I'd like to drop everything down into the Master bedroom, where I will install a panel that is set in the ...
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2answers
66 views

Using conduit with THHN

May I run THHN above ground under a house unprotected or is a conduit required for this? The wires consist of 3 4AWG wires with an 8AWG ground going from a 60A breaker at the (100A) service to a newly ...
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1answer
82 views

When running crawl space conduit, must the conduit be run through the joist via drilled holes, or can they be attached underneath?

I'm wiring my home for 110V and cat6e(48-0V). There is currently no wiring, just an air tight shell with interior studs exposed. There is a crawl space where I would like to run all of the conduit ...
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2answers
3k views

Is a weather resistant gfci required outside in a metal box with in use cover?

I have a pool that is just off my deck. The gfci I have went bad so I need a new one. It was a 15 amp gfci in a metal box attached to 1/2 in emt conduit with a metal box and a non in-use cover. This ...
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3answers
9k views

Cat 5/6 in same conduit as power: is NM-B required, or is THHN acceptable?

Preface: I'd like to avoid the question of whether one should run data and power together; my question is focused on Code compliance. I'm trying to ensure I interpret Code correctly when running Cat ...
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2answers
94 views

Can I wire a 120v 20A outlet with #8 wire

I am installing an outlet on the front of my house to charge my Kea Niro. The current charger I am using requires a 120v 20A circuit. In the future I expect to get a charger that will require a 240v ...
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2answers
37 views

What metal conduit takes a 1-5/8" dia. knockout?

I have a junction box with a knockout that is 1-5/8" diameter. (it was homebrewed, possibly in 1929). Would this be suggestive of a particular type of conduit? It will definitely be metal conduit. ...
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58 views

Electrical : can I attach metal flex to pvc conduit?

I am adding a home run from the main panel to the garage. On the outside of the house, it will be pvc. Where I come through the exterior wall to the main panel, I'd like to use metal flex, for ...
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190k views

Can Romex (NM-B) be run through conduit?

A few days ago I asked an electrician if I could run Romex through conduit - he gave me a funny look and said "No, Romex is not allowed in conduit." When I searched online, there seems to be a wide ...
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Replacing old below-grade sleeves/conduit

Our boiler lines and hot water lines are running from building to building through four 6" diameter sleeves (about 12ft long). They appear to be clay pipe but not sure. Anyway, rainwater now gets into ...
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1answer
61 views

Electrical Ditch Cover Inspection

Unincorporated Pierce County, Washington State, USA. We're covered under Washington State L&I for electrical inspections and I've been digging around their site but have failed to come up with an ...
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1answer
86 views

Electrical pipe heated by heating pipe - against the code?

Please see the picture below. The three pipes in the front are electrical (conduit). The big black pipe in the back is the heating pipe. I guess something went wrong when building the building and ...
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2answers
110 views

TV cables getting stuck in conduit after mounting TV on fireplace

We are first time home owners and trying to learn basic things. We mounted our TV ourselves yesterday. I'm now trying to hide the wires. There is already a rugged conduit (something like this) behind ...
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2answers
59 views

How to remove metal ring on flex conduit?

I'm replacing my electric car charging station with a newer version. The current one is fed from behind by flex conduit which is held in place with a metal ring. The ring is featureless and smooth (...
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3answers
130 views

What types of communication cables can pass through electrical conduit?

Originally asked at Network Engineering What types of communication cables can pass through electrical conduit? I believe that optical fiber is the only one possible. However, I'm not sure. I'm ...
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4answers
6k views

Metal conduit balusters

I'd like to use galvanized metal conduit as deck balusters with pressure-treated lumber. Will the bare metal resist rust? If not, is there an inexpensive way to improve its rust resistance?
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92 views

How can I drill conduit hole through plywood firestop I can't reach?

I'm trying to run a 3/4" conduit (1" OD) from unfinished basement utility room A to unfinished utility room B, through the ceiling of finished room C. There are several floor trusses which are easy ...
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1answer
108 views

Derating 6 current-carrying conductors?

I'm having a hard time understanding 310.15(B)(2)(a). Here's the boat I'm in: I hooking up a tankless water heater that calls for 3 40 amp breakers (it's a 24 kw Ecosmart). So I put in a sub panel in ...
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1answer
292 views

Running 240v power to detached garage for electric vehicle

We have a detached garage approx 95ft away from the main house and we are looking to run a 240v circuit there. Currently we have Romex wire running straight into the ground. (This is how it was when ...
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1answer
4k views

Is PVC conduit OK above ground to hook up a Jacuzzi?

We are hooking up a Jacuzzi and need to run # 8 wire above ground What PVC should we use to run under our house to get to the back yard? I have read Schedule 80 PVC will work.
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57 views

Metal Conduit For Tankless Heater

I'm looking at getting an EcoSmart(or similar) electric on demand water heater in my home(WA state, not in Seattle). The sizing indicates I'll need 3x8ga(3x40A breaker) conductors. Long story short, I ...
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1answer
103 views

Run conduit from exterior sconce

We have a sconce on the outside of our brick house on a covered patio currently. I would like to run conduit from it to allow us to place an exterior fan on the same covered porch. My questions: 1) ...
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1answer
36 views

wire size for 140` run

I'm going to wire a sub-panel 140 ft from the main service. I would like 70 amps to be available; the actual load won`t exceed 50 amps for now, but I may need more later. The problem is the wire ...
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1answer
51 views

What's the proper way to bond metallic signal wiring raceway?

I have a stud cavity through which I need to run some signal wiring that's sensitive to ingress noise. An industry-standard recommendation is to run the wiring in properly bonded metal conduit (...
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2answers
453 views

Electrical design for a house with an ADU, solar, and backup generator

I recently moved into a fixer-upper house, and have some questions about how to go about (re)designing the electrical system in a way that meets my somewhat unique timeline and site requirements. ...
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1answer
77 views

Help running romex and conduit for new outlet through cold air return

I have two circuits right now that both terminate in the outlet box for the range hood/microwave. The one that goes into the box from above up in the second floor joists is a currently unused circuit (...
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1answer
62 views

Do you run a conduit under or over concrete wrap in the basement?

My basement concrete wall is covered with a concrete wrap and is anchored to the wall. The walls are unfinished. If you want to add an outlet down the wall to a workbench, do you run the conduit ...
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1answer
31 views

Weather proof connection from FMC to box

I usually use these clamp connectors to connect flexible metal conduit to a box: However, I am now installing a weather proof light fixture box outside of a shed (just surface mounting it, poking ...
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2answers
95 views

EMT Grounding requirements

I'am running 2" EMT from an outside enclosure through the exterior wall into a switch room that is being attached with beam clamps, The EMT is carrying a Fiber optic cable feed to the switch room that ...
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1answer
33 views

Type of conduit box to use for a Ring doorbell + keyed entry

I have a powered gate at the front of my property and its well overdue to replace/upgrade the intercom system. I would like to install a ring doorbell system and a keyswitch to open the gate. The ...
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4answers
46k views

How many CAT6 cables can fit in 3/4 conduit?

I was planning to get 3/4" conduit (Carlon ENT/Smurftube) to run network cables through the house. Just how many CAT6 cables can safely fit into 3/4" conduit?
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3answers
816 views

How big a hole can I drill in a top plate?

I've got a 2nd story home theater room under construction. The framing has been done, but I'm going to be doing the wiring myself. I want to pass some conduit up into the attic space over the room for ...
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2answers
45 views

Can I use standard electrical cable from a waterproof junction box when replacing an exterior light

I am replacing a faulty exterior light with a waterproof (IP66) LED one with a PIR sensor. There is an existing conduit through the wall, but it is a thick stone wall of an outbuilding and the ...
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3answers
3k views

Using receptacle mounting screws for ground connection

I will soon be adding some outdoor wiring using weatherproof metal boxes and EMT conduit. I noticed when I was playing around with a multimeter that without a ground conductor between a receptacle and ...
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1answer
456 views

Running wires through conduit on outside of house to feed garage sub panel

My electrical panel is in the basement on the west end of the house and my garage is on the east end. I had planned to run a 6/3NM-B cable along the joists and through the rim joist to get into my ...
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2answers
5k views

Cable securing/support, conduit, etc when exiting main service panel: questions

I'm totally confused by this. Looking for any help that anyone can provide. I've attached a photo of the top of my recently-installed (inspection passed) service panel. The top of the panel sits ...
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2answers
852 views

Wiring up a shop with underground conduit

I am wiring a 36' x45'shop that will store my RV and other equipment. I have 200 amp service already in. I want to put utilities in under the concrete pad before I have it poured. I would like to ...
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123 views

How to seal hole from bundle of ethernet cables running through wall/floor?

I'm setting up a home ethernet network in a spare bedroom. I envision running up to two dozen ethernet cables out of a patch panel in this room to the rest of the house. I'll likely bundle these ...
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4answers
232 views

Can I remove the sheathing from cable just where it passes through conduit?

I am adding an outlet in my unfinished basement from a cable that will run from the ceiling down a corner of the room. I was going to just attach the cable to the studs but I would like to protect the ...
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4answers
7k views

What's the correct way to pass wire to exterior electrical box?

I'm doing some remodeling in our basement, and came across the following (see pictures). It looks like the contractor simply wrapped tape around the conduit to secure the box to the wall. How are ...
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3answers
86 views

How do you keep bugs/dust out of electrical conduit which terminates in the open?

Though it isn't specifically stated in the code, I try to protect cable that is installed less than 8 feet from the ground with conduit. This tends to be accepted by inspectors as "protection from ...
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2answers
54 views

Seal a 1in drilled hole in concrete block

I need to drill a 1 inch hole in a basement foundation block wall to pass a 1/2 emt conduit through. How do I seal the gap afterwards to pass inspection, prevent mice, insects, rain and drafts. ...
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1answer
1k views

125amp feed from garage to house, required wire size, PLUS a separate 3-way light switch

I recently built a detached garage with its own 200amp service. I made provisions to run a 125amp feeder from the garage to an addition we are now building on the house. My questions are: What size ...
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2answers
129 views

Can I close emt ell in wall?

I know that it will be difficult to impossible to fish anything through it later, but can I close up emt in the wall with a 90-degree ell (uncurved)? It's easier for me to use rigid conduit for this ...
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165 views

Electrical code - Conduit requirements for 50A copper cable through outside wall

Can anyone advise what (if any) sized conduit one has to use per code to have a 50A copper cable run from inside through an outside, concrete, wall? I live in Maryland, USA, if that is helpful. Would ...
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2answers
133 views

What type and size conduit should I use for my service entrance cable?

I am running my aluminum service entrance cable from the main panel to a sub panel in my garage. It runs from the garage under the house then out the wall, makes a 90 degree turn to go into my side of ...
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1answer
72 views

Old-style electrical conduit connector?

See photos. I'm having trouble finding this on the internet. Looks like it's some kind of compression connector for EMT conduit, with dimples. The conduit is 3/4" What is this style of connector ...