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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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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
53 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
69 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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23 views

Support EMT between two closely adjacent junction boxes?

EMT must be supported within 3 ft of termination ends. I have two junction boxes 3 ft apart. Do these junction boxes support each other? Does this count as support?
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3answers
124 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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2answers
91 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
100 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
143 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
83 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
34 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
47 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
61 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
26 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
32 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
77 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
411 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
42 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
826 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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0answers
85 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
146 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
77 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
46 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
587 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
126 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
114 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
64 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
73 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
60 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
190 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
108 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
58 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
623 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 ...
3
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2answers
340 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
394 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
138 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
107 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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2answers
75 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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3answers
371 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? ...
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1answer
155 views

PVC conduit into PVC box: Can I make it watertight when using a threaded fitting? Are sealing locknuts allowed?

I have some 2" PVC conduit coming out of the ground and into a PVC box where it enters with a terminal adapter and held in place with a locknut. I intended to use a sealing locknut to keep the box ...
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4answers
58 views

EMT Conduit Strapping to a Narrow Joist

I going to run 1/2" EMT conduit on the bottom of a joist. The standard straps I have are too wide to get both nails/screws in. I would prefer to run the conduit down the center of the joist. I wouldn'...
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1answer
69 views

Run 6 AWG NM-B cable through 1 1/2 PVC pipe indoors

I am running a 6/2 NM-B Romex for approx. 45 feet from my service panel to my garage for a wall charger for an EV. No unfinished space in basement and and garage wall is on concrete slab of garage, so ...
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1answer
345 views

Narrow conduit with 90 degree elbow - three thhn wires

Currently the narrow conduit (1 inch outside, so inside maybe 3/4 inch) has 2 wires (hot and hot switched). I want to include one neutral so I can change to a light switch outlet combo. It is an old (...
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2answers
153 views

Narrow conduit (old building), need to run 2xhots, 1xneutral

Currently I have two wires running through the conduit: one hot (coming from box), and one hot switched (on/off according to light switch). I would like to convert it to an outlet switch combo (one ...
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1answer
38 views

how to replace surface conduit for a two-wire lighting circuit?

I have an old house with unswitched knob-and-tube running to a ceiling fixture. Previous owners ran surface conduit to a wall switch and to a second light fixture over the sink; none of this was ...
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1answer
902 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 ...