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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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69 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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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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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
71 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
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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2answers
92 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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57 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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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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2answers
104 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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129 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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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
107 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
273 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
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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35 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
50 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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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
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
30 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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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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2answers
91 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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2answers
446 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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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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2answers
848 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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118 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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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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4answers
226 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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3answers
82 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
53 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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3answers
791 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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161 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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125 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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1answer
68 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 ...
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1answer
77 views

Is the blue conduit connected to my sub-panel suitable for a 50A branch circuit?

I have to add a 50 amp circuit to the sub panel in my garage. I found one of the open knockouts in the top of the panel to have a blue flexible conduit looking stuff in it which runs up into the ...
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1answer
73 views

Gap in conduit running to electric meter

There's a gap in the conduit running from underground to my electric meter. I'm sure that's a problem, since weather could get in. It appears to be PVC. The question is: Can I service this myself, ...
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3answers
237 views

Using conduit from ceiling to wall for closet switch?

We're adding a wall to separate a garage and want to put outlets and a light switch in the wall but it was installed aligned with a steel beam above it so there is no way to fish a wire down into the ...
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2answers
129 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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2answers
60 views

how to run conduit past/over wide stone foundation

I'm planning to run 1" conduit to power an outdoor sauna. In digging the trench, I discovered that my old stone foundation runs outwards from the house. That is, while the inside cellar wall is ...
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2answers
827 views

Does PVC conduit need a termination bushing at a service panel?

I'm installing a panel with the feed conductors entering via 1-1/2" PVC. Is an end bushing, as shown here (for example), required by the U.S. NEC for PVC? image source
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1answer
58 views

Individual conduits for each phase to reduce amount of stud being drilled

I'm trying to do some improvements on an existing structure that leaves me little room for maneuvering. I'll break it down as simply as possible. I have two large PVC junction boxes (completely ...
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2answers
384 views

Relabeling 6-AWG Wire

I'm pulling 2 hots, 1 neutral and 1 ground through conduit to a subpanel and I was wondering if it's possible to use the same color wire and just relabel the endings. I was thinking of using 6 AWG ...
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2answers
38 views

Metal or PVC Conduit in Metal Outbuilding?

I'm running wiring under ground from main panel to 100 amp panel in metal garage. When installing lighting and receptacle circuits mounted against interior walls, does it make any difference what ...
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3answers
457 views

How to splice into existing underground rigid metal conduit below ground and hide junction box?

I have an existing rigid metal conduit run from the service panel to a junction box location that was previously powering an outdoor appliance. The circuit is 20A and running 12 guage wire. The RMC ...
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1answer
186 views

Attaching conduit to fence

Can I attach pvc conduit to an existing chain link I am installing a storage shed and I don’t want to dig a ditch
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1answer
120 views

Running AC/MC cable in boiler room, do I need additional metal conduit?

I'm planning to run AC cable (or MC, not sure which is better) in my basement to install an outlet near the boiler room. the cable that powers the boiler has sections that are inside of a rigid metal ...
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80 views

Mixing PVC Conduit Schedules

I grabbed sched 80 heavy wall PVC conduit for my run to the shed, but later noticed the elbows are sched 40. Is it legal to use them together (mixed in the same conduit run) in the trench or anywhere ...
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435 views

EMT Conduit Capacity with Mixed Guage

I want to pull two circuits through 1/2" EMT. Three of the wires would be 12AWG and other three 10AWG. I've found a couple of tables that say I can run 5 10AWG or 9 12AWG. Is my mixed gauge set safe? ...