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.

39
votes
7answers
192k 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 ...
29
votes
4answers
5k views

How to future-proof a long cable run

I'm starting on a project that will involve digging a long (roughly 150-200 meter) trench from my house down to the road. The trench itself will be a considerable expense and so while the ground is ...
13
votes
2answers
4k views

Can I use old abandoned iron pipe as electrical conduit?

I have an older house (1920) and I have been planning on doing some rewiring to get rid of some k + t stuff. Anyway, I just noticed today that there are some irons pipes that used to be part of the ...
12
votes
6answers
40k views

Why is ENT rarely used for electrical wiring?

As best I can tell, the National Electrical Code 2011 allows electrical non-metallic tubing ("smurf tube" or ENT) to be used for running 120 V electrical wire. But everywhere I look, I see remarks to ...
9
votes
2answers
10k views

How do you protect romex at the end of an EMT run?

Sometimes you need to run a circuit through both protected & unprotected space. For example, you might put a recep in workshop (unfinished walls = unprotected) over a crawlspace (protected). To ...
8
votes
5answers
42k views

Why is it good practice to remove sheathing from NM wire when going through conduit?

I've been discussing specifics of an electrical job with a licensed electrician and he mentioned that in my area, it's acceptable/recommended to feed 12 gauge NM wire through an outdoor conduit but ...
8
votes
1answer
753 views

How should I install a signal cable duct from new home office to a wiring closet?

I'm constructing a new home office and rather than having fixed cables from the (existing) wiring closet, I want to have the flexibility to add/remove/change cables in future, so I've been looking at ...
8
votes
4answers
24k views

How do I get all these wires up from the basement to the attic?

I'd like to run new cabling for data, voice and tv but I'm having a hard time figuring out how to get some of the wires up to the attic for the 2nd floor and would like some advice. I've run cables, ...
7
votes
4answers
2k views

How do I bend EMT conduit to a broader radius?

I work a lot in EMT conduit. I have a 1/2" conduit bender that bends to a 5" radius, and a 3/4" conduit bender that gives a 6" radius. I also find bent pieces of conduit around the lodge that have a ...
7
votes
2answers
833 views

Do I need junction boxes where conduit containing data cables terminates?

I'm going to be running 1" blue PVC conduit from all my low voltage boxes to a structured wiring panel. My wiring panel will chase to the attic where necessary and I was wondering what the best ...
6
votes
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?
6
votes
5answers
17k views

Does a grounding wire from a breaker panel to an outside grounding rod need to be in conduit?

I've got a breaker panel in my detached garage (it is not a sub-panel, but is a primary forked off just past the meter). The panel seems to be wired correctly- the neutral and ground bars are tied ...
6
votes
2answers
12k views

Is a splice permitted in a PVC conduit body?

I'm talking about something like this Type LB Conduit Body
6
votes
1answer
4k views

How can I adapt a wall outlet to suface mount conduit?

I have a single gang in wall outlet in my basement. I would like to adapt it into surface mount EMT conduit to get an outlet at a different location. Ideally I would be able to keep a plug at the ...
6
votes
2answers
639 views

How do I set up a wiring closet that connects to the exterior of the house?

I'm looking to build a central wiring closet for ethernet, phone, and co-ax. I would like this closet to have a single pipe to the exterior of the house, which service lines can come in through. ...
5
votes
5answers
915 views

Ground-level electrical wiring to shed outdoors possible?

I was telling an uncle about the concern of digging a conduit trench in my heavily planted garden (trying not to disturb the plants) to run electricity from the house to the shed about 35 feet away. ...
5
votes
4answers
78k views

Can I use indoor Romex in buried outdoor conduit?

Or should I use outdoor Romex? I heard that outdoor Romex doesn't need conduit as you are just supposed to bury it. Edit: Ack, I should have mentioned I have existing conduit that I want to pull the ...
5
votes
3answers
2k views

Running electric cables in basement shop

I am setting up a workshop in the unfinished area of my basement. I need to run a couple of electrical outlets and would like to run them along the block walls through grey PVC. Will this be a ...
5
votes
2answers
674 views

OK to reposition a 90 degree sweep of Schedule 40 conduit after it's been glued?

I've installed 2" Schedule 40 direct burial pipe from power pole to power pole so that AT&T, Comcast, & Wave aerial cables can be run underground instead. I've completed the conduit ...
5
votes
3answers
1k views

What material to use to close a too wide wire tunnel?

During the cold days I noticed a little draft coming from the light switch next to my house door. Removing the switch revealed that the tunnel for the cables was widened to fit the cables for the ...
5
votes
1answer
3k views

What would be the most economical way to run wire for a driveway light?

I want to run electrical power through my woods to end of driveway. There will be no driving or walking over this area of 300', but I do have squirrels, deer and other "critters" that might chew. What ...
5
votes
2answers
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 ...
5
votes
1answer
27k views

How should I run speaker, HDMI and electrical wiring for my ceiling mounted projector theater room?

BACKGROUND: New house built 5 years ago. I have a basement theater room with 12 foot drywall ceilings that have HVAC conduit and recessed lighting (in other words there is some space behind/above ...
5
votes
2answers
202 views

Can I cut the protruding conduit to the floor level and cover it with junction box?

I've removed the old island which had the electric range, with the conduit coming from the crawlspace: The junction box was attached to the back of the cabinet holding the range. But the new island ...
4
votes
2answers
860 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 ...
4
votes
2answers
7k views

What size wire should I use for my yard shed, and how deep should I bury it?

I'm planning to build a shed next spring, and want to make sure my thoughts on power are correct. The shed is about 100' from the house, with another 20' inside the house to get to a subpanel. All I ...
4
votes
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 ...
4
votes
4answers
7k views

Running NM-B in PVC SCH 40 Conduit from Outdoor Breaker Panel

For space-saving reasons, I have outdoor breaker panels, and most of my branch circuits are wired through the attic down to individual outlets. Currently, the wires run through the wall from the ...
4
votes
2answers
2k views

Is Schedule 80 PVC Conduit Suitable for Short Directional Boring?

I'm running some electrical wire around where I'm building my house. There are two places that I'd rather not dig through: A driveway and a creek. The creek is the most important, because the state ...
4
votes
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 ...
4
votes
2answers
2k views

Is there any NEC code requirement for how far off the floor Category 5 wiring must be run?

I am currently running conduit for Cat5e cable in the home office I am finishing off. Are there any rules in the code for how far off the floor Category 5 wires in conduit must be run?
3
votes
4answers
4k views

How do I widen a hole in wood for flex tube?

I bought some 1" smurf tube so that I could run coax, ethernet, and speaker cable to various low voltage outlets in my house. I used a 1-1/4" speedbor bit to make a hole in the floor from my crawl ...
3
votes
2answers
70 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 ...
3
votes
3answers
192 views

Can I split off a 20a with a conduit body?

So I am coming out of my subpanel with 1/2 in metal conduit and using metal handy boxes with NEMA 5-20 for all the receptacles on my two indoor branch circuits. One is dedicated for a window unit AC. ...
3
votes
1answer
2k views

Adding a new “knockout” to side of main electrical panel

I'm planning on running a 6/3 feeder cable from my main panel to the garage for a small 50A subpanel and am unsure of how to plumb the new cable to the main panel. All of the knockouts are on the ...
3
votes
3answers
42k views

Does electrical wires on exterior need to be in conduit?

Do I need to run electrical wires exiting the breaker box on the exterior wall of the house & traveling across the wall in conduit or can the wires be stapled to the wood siding with steel staples?...
3
votes
4answers
614 views

How one is supposed to “plug” a conduit running from basement to attic?

I'm going to install a 2" conduit from my unfinished basement into the attic, through the first and second floor. It will be used primarily for getting Cat6 cables into upstairs bedrooms. 2" diameter ...
3
votes
2answers
394 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 ...
3
votes
1answer
63 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 ...
3
votes
1answer
5k views

Pulling wire through EMT and PVC conduit

I'm running two circuits outside to other side of yard. I don't have much experience pulling wire so I wanted to make sure I'm doing it right. I have stranded and solid 10awg. I purchased both not ...
3
votes
1answer
458 views

Does code allow daisy-chaining these surface outdoor lights?

The two lights shown in the photo were fed from a junction box that was destroyed when a truck backed into it. I'm thinking of running new conduit above vehicle level, and the most straightforward ...
3
votes
1answer
130 views

Easiest & NEC 2011 compliant way run wire into attic?

I have this surface mount wiring connected to an outlet through the bricks (bottom-middle in photo). I would like to branch from this to add a switch (through bricks) and go straight up into the ...
3
votes
2answers
2k views

What is the preferred method for removing & replacing electrical wiring in the garage?

I just purchased a house built in the mid-1990s in Kansas, U.S. The garage is generally finished: It has sheetrock walls and ceiling. It also has outlets spaced every 6 feet or so about 4 feet above ...
3
votes
1answer
213 views

How to install drywall over electrical box connected to rigid conduit?

I'm trying to figure out how drywall is supposed to be cut out to go around preexisting electrical boxes that are attached with rigid metal conduit. The conduit is the ground path. My dilemma is if I ...
3
votes
3answers
2k views

Can I use Schedule 40 PVC to protect a grounding electrode conductor where exposed to physical damage?

Can I use Schedule 40 PVC to protect a 4 AWG grounding electrode conductor (wire from main panel to grounding electrode) where exposed to physical damage (a few feet between the panel and the ground ...
3
votes
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 ...
3
votes
1answer
3k views

What are my options for running feeder cable into an exterior main panel?

I'm trying to connect a 4/3 nm feeder cable into to my exterior mounted service entry / main panel. There is already what looks like a 1 1/2" rigid conduit from the crawlspace through the rim joist ...
3
votes
2answers
3k views

Should I be able to run some 1.5" PVC chase conduits from attic to basement next to a cold air return?

I have a new home I just moved in to and rather than having them put this stuff in ahead of time (silly me) I'm now trying to do it now. Here is my situation... I live in a 2 story home with a ...
3
votes
1answer
114 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 ...
3
votes
2answers
2k views

Fittings for conduit passing through ceiling/floor

A follow up to this question: Running Coax cable to the upper floor If I cut a hole in the ceiling of my dining room and then another in the floor so I can run a conduit from the upstairs all the way ...