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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votes
7answers
360k views

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

A few days ago I asked an electrician if I could run cable 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 ...
6
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3answers
24k 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 ...
5
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4answers
12k 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 ...
9
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2answers
2k views

Can I run stripped Romex/NM through conduit?

If I have NM cable running into a junction box, can I strip the sheath of the NM cable starting inside the junction box and run the conductors without a sheath through conduit that is connected to the ...
1
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2answers
312 views

Is this plan for running a circuit in buried conduit correct?

I'm planning on running a single circuit from my sub-panel in the garage to my backyard storage shed. This is an uninsulated, unheated wooden structure (pressure treated lumber, painted T1-11 siding, ...
32
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4answers
6k 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 ...
6
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2answers
18k views

Is a splice permitted in a PVC conduit body?

I'm talking about something like this Type LB Conduit Body
4
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2answers
337 views

conduit for ground in metal shop

Ive run my EMT conduit and placed my boxes in my workshop and placed the wires. All is good except... my inspector says I cant use conduit as ground and must run a bare or green conductor to each ...
3
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2answers
4k 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 ...
9
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5answers
76k views

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

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 ...
4
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2answers
8k 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 ...
3
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2answers
271 views

8 AWG solid EGC in raceway for 100 amp subpanel

I'm adding a 100 amp subpanel to my detached garage and have a question about the EGC I've already pulled through the underground LFNC-B raceway. Taking the advice from a similar post on this forum, I ...
2
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2answers
133 views

What is the trade term for the thing that connects the top of a load center panel to 2" EMT conduit?

What is the trade name for the "adapter" for the top conduit hole that is covered at the top of this picture that would allow you to connect 2" EMT conduit? It needs to be rain tight (...
2
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1answer
124 views

How do you correctly use EMT conduit terminated into a female-threaded raintight hub atop a 3R outdoor panel?

What is an NEC-accepted way of using EMT pipe with this female-threaded hub? (The picture is an Eaton DS200H2 2" Rainproof Hub/Conduit/Plate to be used atop of a Eaton NEMA 3R BRP20B200R.)
1
vote
1answer
503 views

Is it okay to use an LFNC whip to connect air conditioner where subject to physical damage?

I have seen many air conditioners at ground-level in multiple cities near me that are connected using liquid-tight non-flexible conduit (LFNC) whips. Example: http://www.southwire.com/products/whip-...
9
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5answers
90k 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?
5
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4answers
2k 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 ...
10
votes
1answer
9k 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 ...
10
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2answers
15k 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 ...
3
votes
3answers
105 views

Using steel conduit as a ground intermitantly. Any problems with this?

Small back story: This is a Philly row home, so the long walls are solid brick. original outlets were non-existant or embedded in baseboards. While most of the home is being wired with romex, I am ...
3
votes
1answer
235 views

Is it ok that the cable for my dryer circuit is suspended from the ceiling?

I have a dryer line hanging from the ceiling joist. Will it pass code if it's attached to the poured concrete basement wall? Do I need to put the wire through conduit? Thanks.
1
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4answers
3k views

Using PEX as wire conduit

I have some 1/2" PEX-AL-PEX left over and thinking about using it as conduit for ~20' ethernet or phone cable. Pipe is appropriately orange. Will the aluminium layer provide RF shielding? (assuming I ...
0
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2answers
116 views

What kind of conduit do I need for my mini split AC line?

Running 240V for mini split through exterior wall in conduit from indoor unit to outdoor unit. Cable supplied by mfg is SJOW 16/4 105c 251603 3/8" O.D. Can use 3/4" non metalic flex conduit (...
32
votes
4answers
4k views

Why can I not assemble conduit around cable, but must pull it after assembly?

I have seen a number of answers here from our esteemed electricians about running wiring through conduit, and many of them include a warning similar to: You're not allowed to piece the conduit ...
11
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3answers
2k views

Does it matter if my underground conduit overlaps or crosses over existing conduits?

I'm planning on digging a trench for underground electrical conduit. I recently called my state "call before you dig" underground locating service. They finished marking the locations of ...
8
votes
1answer
906 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 ...
6
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4answers
22k 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 ...
6
votes
4answers
123k 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
6k views

Do separate pieces of EMT conduit qualify as "pull points"?

Question: Do two separate pieces of EMT conduit joined by a connector qualify as a "pull point"? Background: I need to make six 90 degree turns in 2" EMT conduit to route wire for a new sub-panel ...
5
votes
2answers
3k 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
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3answers
4k views

Can 12 AWG THHN/THWN wire be placed in a buried conduit?

My understanding is all buried wire in conduit must be THWN-2. Per Southwire's spec sheet here the end of the first paragraph reads: All Sizes Rated Both THHN and either THWN (sizes 14, 12, and 10 ...
3
votes
3answers
4k 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
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2answers
2k 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 ...
3
votes
2answers
4k 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
3answers
1k views

Adding wires to EMT conduit to add circuits

unfortunately, the kitchen wiring in our new condo is severely outdated. Just two circuits; one 15amp for lights and one 20amp for fridge, microwave, gas stove and oven, garbage disposal, dishwasher ...
2
votes
1answer
562 views

How should I run this conduit for security cameras across a flat roof?

I am putting in three new security cameras on a far corner of a building that already has cameras around all the other sides. The reason this corner was left for last is that it is the hardest to run -...
2
votes
1answer
389 views

Is THWN wire appropriate for an underground vehicle charging circuit?

We recently purchased a Tesla Model 3 and are planning on adding a 240V NEMA 14-50 outlet in our detached garage to improve charging speeds. Tesla's documentation specifies 6 AWG copper wire with 4 ...
2
votes
1answer
4k views

Sizing grounding conductor for multiple circuits in conduit

If I have two sets of conductors (two unbalanced 120V circuits) in a conduit, can they share a ground wire and if so, is the ground wire sized by the minimum ground wire sizes for the sum of the ...
1
vote
1answer
1k views

When derating for wires in conduit, do you round up or down?

Someone else is wiring up an on-demand heater. They need three 50A breakered circuits and they want to run the kaboodle in one conduit. They want to use #8 THHN wire because it's allowed to 50A @ ...
1
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4answers
19k views

Regulations for buried cable in the UK

I'm running a cable from my house to a site in my back garden where I am building a shed. The length of the cable run is about 7-8 metres. I have steel armoured cable which is OK for direct burial. ...
1
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1answer
166 views

Adapting an outside wall outlet to suface mount conduit?

This was a previous question with some great answers. How can I adapt a wall outlet to suface mount conduit? One answer was: "There are collar boxes available that have conduit KO's (knockouts). Just ...
0
votes
1answer
340 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 ...
0
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1answer
9k views

PVC electrical conduit connection to service panel

I am installing an outdoor conduit that consists of four #8 AWG THHN wires inside gray 1" PVC. I need to hook it up to the main service panel and I am not sure what's the best way to do it. I ...