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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43 views

Conduit fill - number of circuits .vs. number of branches

I think I get this one, but just to verify or clarify... (USA NEC) When running multiple circuits (different breakers) in a single conduit, you have to derate after (is it 4?) sharing the one conduit....
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36 views

Flexible Metal Conduit length limits with grounding

Basic question - if I have a long run of flexible mc, 12/2 with a green equipment ground wire inside, am I limited in my overall length of this run as long as I meet the support requirements? I see ...
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109 views

Flexible Nonmetallic Conduit inside wall?

I’m finishing up wiring a sub panel in an outbuilding. There is an underground run of PVC conduit with THWN, which comes up to an LB on the exterior wall. On the inside I used flexible conduit so I ...
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65 views

Wire layout attic conduit

I'm running a pretty heavy circuit from my sub panel to the adjacent wall in the garage. I'll be pulling 6awg THHN wire through smurf tube, and then switching to PVC tube and running it down the wall....
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143 views

Run conduit perpendicular to ceiling joists in garage

I have a sub panel on a finished wall in my garage. I want to add two 20 amp circuits and run them go outlets on two unfinished walls on the sides of the garage. Is it okay to run metal conduit ...
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90 views

Inground Conduit Box for Driveway Snow Melting

I'm installing snow melting cables into a concrete and stone paver driveway. It requires 5 mats rated at 25 Amps and 6000 watts. I also need a 6th small run of heating wire to cover the full area. ...
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1answer
46 views

Minimum distance from receptacle terminal to conduit connector

Is there a minimum distance required from a receptacle terminal to a conduit connector? Surely this is defined in the NEC somewhere right?
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41 views

How much does EMT conduit installed vertically on a poured concrete interior basement wall have to extend beyond the top of the concrete?

I'm installing outlets in my basement on poured concrete walls and will be using EMT for conduit. How high over the top of the concrete walls must the conduit extend? The original wiring has conduit ...
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607 views

Appropriate conduit for several data cables underground over 300' run

I have done some searching around but have not found anything definitive, and/or my background is weak in this area and I may be understanding poorly. I will have 2-4 PoE cables that will be run ...
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1answer
32 views

Out Building Circuit and Hot Tub Wire Run?

I have separate garage building that is fed by a 240v 50A circuit run through 1" schedule 40 to a sub panel in the garage. We are installing a hot tub off the main house but it will be located near ...
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2k views

Any way to meet code with 40.7% or 40.44% conduit fill?

I’m running conduit along the walls in my shop (in a commercial warehouse) to provide power to some machines and additional outlets. The service is 3 phase, 208 V, 100 A. One of the machines requires ...
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1answer
62 views

Branching off multiple horizontal pipe/conduit runs?

I have to run electrical (EMT), network (schedule 40), and compressed air (Rapidair) lines along the walls of my shop. I'm doing this by putting up vertical sections of Unistrut, and attaching the the ...
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68 views

Does cabling between a mini-split indoor and outdoor unit need conduit?

I am installing a mini-split AC system where there are multiple indoor units connected to a single outdoor unit. For each indoor unit, there is a separate 4-conductor cable that connects to the ...
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32 views

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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1answer
76 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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47 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
112 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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103 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
38 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
99 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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125 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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21 views

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
100 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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235 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
66 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
160 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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95 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
195 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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2answers
976 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
99 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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1answer
39 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
56 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
126 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
65 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
48 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
34 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
141 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
584 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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2answers
55 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
1k 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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2answers
272 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
64 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
452 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
117 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
74 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
2k 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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0answers
219 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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214 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
85 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
83 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 ...