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39 votes
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How to future-proof a long cable run

Empty conduit is your best bet here. No point in guessing what (if anything) you may get, and guessing wrong. While you can leave a pull string in it, you can also just vacuum a pull string into it ...
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  • 134k
37 votes

Is there a need to replace wiring if I tripped the microwave oven when drilling through drywall?

Code never prohibits the use of conduit. Even if it isn't required, some installers might want it for future pulls or just protection. Non-metallic cable is the minimum standard. Many municipalities ...
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  • 105k
35 votes
Accepted

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

Guaranteed Reusability If you run the wire as you are putting together the conduit, there is a possibility, unless you are truly careful about all the details, that you could end up in a situation ...
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29 votes

How do I place electrical conduit under a creek?

Just grab a shovel and have a go at it. Seriously, given that we're talking about a mere 4 feet (and a bit) and 24 inches aren't that deep either, I can't imagine it being worth the hassle to bring a ...
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  • 1,665
26 votes

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

Far more opportunity to damage the wire insulation - either by mechanical damage from the exposed ends of the conduit/fittings being slid along the wires (metal or PVC), or from cement/primer if PVC. ...
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  • 134k
26 votes

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

Well, it's never a good idea to "divining rod" the intent of the NFPA. Because jackasses mainly are looking for one reason that they can rationalize around, so they can fabricate a reason ...
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24 votes
Accepted

Can I run stripped Romex/NM through conduit?

The wires in NM aren't labeled for use outside the cable jacket, and may not be the correct type for use in conduit to begin with First off, the wires inside a NM cable are not marked or labeled at ...
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24 votes

Is there a need to replace wiring if I tripped the microwave oven when drilling through drywall?

Answer based on new images, previous answers were assuming conduit. Based on the picture that was edited in later, you have nicked an electric cable directly rather than drilling into conduit. I don'...
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  • 26.6k
23 votes
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Does it matter if my underground conduit overlaps or crosses over existing conduits?

Crossing existing utilities is no problem; it happens all the time. Just be careful when digging. There is probably a prescribed margin to either side of the marks within which digging must be done ...
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  • 19.6k
19 votes

Can an incoming optical fiber cable be wired internally in a house's walls?

So you want access behind the walls to upgrade your network wiring (since it changes really often compared to the lifetime of the house). But, you also want to seal the walls up in drywall, mud and ...
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17 votes
Accepted

Replacing an outdoor PVC junction box where it rains a lot

Wrong box. Bad installation. Why is the lid so warped? Far too much stuff was crammed into that box than was legal (cubic inch rules) or practical. So the installer just cranked down the lid screws ...
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16 votes

How should I mount conduit to my wood-laped siding?

Those hangers will stick out and potentially catch on clothing. I would use saddles.
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  • 13.2k
16 votes

Is there a need to replace wiring if I tripped the microwave oven when drilling through drywall?

Actually, it is quite the opposite. Most states allow the use of non-metallic cable or conduit, but some only allow conduit. Conduit comes in several varieties, including PVC. PVC conduit is similar ...
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15 votes

How do I properly prepare stranded wire for a screw down connection?

As a Brit who uses far more stranded wire than solid [I don't do first fixes, that's someone else's job], there are two ways to do it 'properly', but this can depend on how much room you have in your ...
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  • 4,369
14 votes

Is it wrong to run ground wires all the way through conduit to each junction box?

Yeah, what you did was "belt and suspenders". Doesn't hurt, doesn't help much. Feel free to do that anytime you want. I tend to do it when I am concerned with physical damage to the EMT, e....
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14 votes

Is there a need to replace wiring if I tripped the microwave oven when drilling through drywall?

The wire is nicked. It is thinner than it's supposed to be, and will overheat and start a fire there unless it is repaired. PVC's fire retardant capabilities are notional at best, so you really want/...
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14 votes

How do I place electrical conduit under a creek?

Sounds like the first thing you need to do is get out there and dig a test hole. Find out what the subsurface soil is like, just how high is the ground water, and just how quickly does a hole refill ...
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  • 19.6k
13 votes

How to future-proof a long cable run

The best future proofing you can do is over-provisioning the amount and size of conduit. Pulling a cable through a relatively straight 200m run is not out of the question especially with proper cable ...
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  • 27.1k
13 votes

Can an incoming optical fiber cable be wired internally in a house's walls?

Yes, fiber can be run internally as well as externally. Your vendor may not provide any way to hand off to internal fiber, though, and may prefer to keep their interface external so they don't have to ...
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  • 134k
12 votes
Accepted

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

There are collar boxes available that have conduit KO's (knockouts). Just install one on top of the existing device box and run your conduit. This one is even better as it has more volume: Brand: ...
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12 votes

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

You can, but it really isn't worth it... It's a nightmare to pull NM (Romex) is already solid wire except in the large sizes, and now you have 3-4 wires bound together. You are trying to pull this ...
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11 votes

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

You can run type NM cable in conduit, as long as the conduit is sized appropriately, and is not in a wet or damp location. If you remove the sheath from the conductors inside NM cable, you cannot use ...
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  • 128k
11 votes

Cat 5/6 in same conduit as power: is NM-B required, or is THHN acceptable?

You mean 800.133. And this very concept of mixing comms and power is highly improbable. I know you're casting around for a way to do this, but this sort of "hopeful reading" is very highly prone to ...
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11 votes

THHN through EMT - then convert to Romex?

You can transition wiring methods at a junction box. Use the EMT wiring method up to the junction box (whole nine yards with fittings and clamps). Then use the NM wiring method beyond it. The ...
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11 votes
Accepted

Can I put an electrical conduit through this space above the wall to simplify future fishing?

Yes, this is a good idea, but a few details. No more than four cables per conduit, unless you're willing to upsize ALL the cables to the next larger size. That is 310.15(B)(3)(a). The conduit ...
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11 votes

Is an ethernet cable threaded inside a metal conduit is more protected from electromagnetic interference?

You discovered wrong. Ethernet runs at 100MHz and up, your line voltage at 60Hz is virtually DC at that frequently difference. With that said, you should still run your data cables in conduit. Not for ...
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  • 1,602
11 votes
Accepted

How do I run more than 2 circuits in conduit?

You can mark the white or gray neutral wires with colored tape. Unlike marking a switch loop wire in cable (where it changes white from neutral to hot), this does not change the function but is simply ...
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11 votes
Accepted

How should I mount conduit to my wood-laped siding?

For EMT (anyway) the spacing is pretty clear - I can't recall if it's the same or different for other types, but it might well be the same. Within 12" of each box. 10 feet maximum spacing (1 ...
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  • 134k
10 votes

How do I bend EMT conduit to a broader radius?

Using the same hand-bending tools you already have, you can approximate a larger bend radius by leaving short sections of straight conduit in between multiple bends. Below is a picture showing the ...
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10 votes

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

Derailed by Derating Your plan is a non-starter, even if you overcome the fill issues you're having, because of the other limit the NEC places on conduit fill; namely, the derating factors found in ...
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