Questions tagged [underground]

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Running Power to My Garage [closed]

My spring project is to install electrical power to my new garage. There is about 20 foot gap between my house and the garage. The wiring will go underground. In the garage, I am planning the ...
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2 votes
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How important are square pipe cuts in Schedule 40 PVC electrical conduit?

I have an electrician installing 2-1/2” Schedule 40 PVC conduit and am not impressed with the cuts that his crew are making with a reciprocating saw. Some cuts are out of square by roughly 15 degrees. ...
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2 answers
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Type of wire needed for 250' run from 400 amp pedestal to 200 amp shop

We are looking to run underground power for 200 amp service to our new shop that is about 250' away using aluminum wire. We are looking at running the wire in conduit. Would we use THWN-2 wire for ...
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3 votes
1 answer
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Suitable run type for 4 gauge copper ground wire connecting buried grounding rods?

The earth ground for our circa 1968 outdoor electrical panel in California is apparently a single maybe 8 gauge(?) solid copper wire running from a capped galvanized pipe driven into the ground (50+ ...
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Do copper water pipes split underground?

I'm trying to figure out where I may have a water leak. This is related to this question. I'm thinking capping and bypassing pipes is easy provide they do not split underground. Do/can they split ...
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Is the hissing sound of water the source point of the leak?

I have a water leak (I think) but no water leak anywhere in my condo. I heard the hissing noise a week ago and still no water anywhere. My condo is upstairs and my garage (and neighbor garage) below. ...
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4 votes
2 answers
524 views

What material pipe to carry water to a detached garage

Location: California. The water service to my house arrives with some sort of plastic material pipe (I would assume this is the original material used in the 70s when this house was built). I now plan ...
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1 vote
2 answers
192 views

UFB cable in conduit?

I have about 200' of UFB cable to run to a barn. Does it require conduit, and does it have to be grey electrical conduit or can it be 3/4 black plastic water pipe?
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Should an open circuit underground UF cable show resistance?

There’s an underground 10-2 UF cable running to an old pump on my property. I was thinking about reusing the cable to run power to a light. Both ends of the cable are disconnected and I put a toner on ...
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23 votes
4 answers
8k views

Can I pour concrete over a PVC sewer pipe without damaging it?

I'm currently in the process of digging a hole in my front yard to install a flag pole. The dimensions of the hole are 16" deep and 24" in diameter. Once I reached my 16" depth, I ...
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2 answers
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3 way switches / multiple buildings / no neutral or ground in conduit

I am installing two 3 way switches to control lights in my shed. I have 3/4" conduit in the ground between the two locations. I DO NOT want to run ground or neutral through the conduit. ...
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Using 1.25" SCH 40 PVC pipe to protect hose for irrigation

I'm setting up a simple irrigation system on my farm to deliver water to my fruit trees. What I want to do is to run a hose (a simple garden hose) through 1.25" schedule 40 PVC pipe to protect ...
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1 vote
1 answer
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running underground electric service to shed on concrete slab

I've been searching for information on how to bring electrical service underground to a shed that will be sitting on a concrete slab 12" thick at the perimeter. The shed will sit about 6" in ...
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1 answer
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2 cables in same conduit

I am needing to run 2 underground 12/2 UB (gray wire) cables for a 20 amp pool pump and a 20 amp gfci socket. Can I run both cables through a single, buried 3/4” schedule 40 conduit?
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12 votes
5 answers
2k views

Can I have utility location done well in advance of a fence project?

Disclaimer: Before any work is done I'm going to have all utility companies come out to properly mark the utility locations. I'm looking to get a fence installed by a fence company. However, in order ...
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2 answers
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What kind of conduit should I use with UF-B to reduce depth of burial?

I currently have a 50' length of 14/2 UF-B. I only need to dig a 40' trench, but I know it should be buried 24" deep. That seems like it will be a lot of work to bury it that deep. It seems like ...
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burying 3 core cable in metal conduit

what is the BS7671 code for running 3core flexible cable in metal conduit that is buried underground. because the environment that i am in is sand. i know in the US they run PVC conduit when running a ...
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1 vote
2 answers
117 views

Can I backfill without inspections using sight tubes?

What code section is it where you can use sight tubes in the trench to determine the depth of your installed conduit so we can backfill without inspection??
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3 answers
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Precautions for a subterranean level

Although our house build is still several years away, we’ve started making decisions about it. I live in a tropical climate and have always felt a subterranean level makes great sense in terms of ...
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5 votes
5 answers
656 views

What is this cable popping out of my lawn?

There's a black cable cutting diagonally across one side of my front lawn (askew to my house, not going towards it, also not going towards the local electric transformer or my neighbor's house). The ...
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346 views

How do I connect underground PVC pipe holding wire to rigid conduit?

I am planning to add a (GFCI) receptacle on a fence post, which is 45m from the garage (power feed). I plan to use NMWU 12/2 cable run in a PVC water pipe (or flexible cable protector) and the risers ...
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1 vote
1 answer
826 views

What size wire for a 300' run to a 60A sub-panel?

I am going to be running wire underground to my shack about 300' away. I will need a 30amp a 20 amp and a 10 amp at the sub panel at the shack so 60 amps total. I assume I am going to need a 2 pole 60 ...
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2 votes
0 answers
38 views

Extend underground rainwater drain pipe down hill

I need to extend an underground drain pipe. The current pipe is underground a few inches and ends at the top of a hill that's a few feet tall. The hill is angled at (perhaps) 35 degrees. The current ...
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0 votes
2 answers
111 views

How to find underground cavities below properry?

I purchased land in an area that was near a former mine. From geological maps, I see the official location of the mine is several blocks away from my property, however, locals told me there were ...
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1 answer
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Running a 50amp 240V line 300 feet to a shed

I'm looking to run a 50 amp 240v line to a shed 300 feet from my house. I have been looking around and reading a lot. Based on this website for voltage drop I need 4awg, to have a less than 3% drop ...
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2 votes
1 answer
102 views

What is this tank?

There was a spigot that was randomly in our yard when we first moved in a couple months ago. Now that the weather is somewhat warmer, I decided to finally dig it up and find the source of water. While ...
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2 answers
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Side penetration on an underground pull box?

Can you make a side penetration in an underground quazite pull box 25"x30"x12"? If yes or no what codes back it up?
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3 answers
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Wiring for outdoor GFCI receptacle in my garden

I have dug my trench. I want to use FMC (flexible metal conduit) since some of my trench is only 8-12 inches deep. I need to know what wires I need inside my conduit. Do I just need a black, white and ...
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13 votes
2 answers
5k views

What metal is most suitable for a ladder submerged in an underground water tank?

I need a ladder in my underground water tank at home, to enable easy access for cleaning and maintenance operations. The water from the underground tank is used for drinking, apart from other ...
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1 vote
0 answers
32 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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2 votes
2 answers
3k views

Removing pole and concrete base from yard

I debated between putting this question here or on SE Gardening and Landscape, but I think this question will be a better fit for this site... Let me know if I need to move it. So I'm now leading ...
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0 answers
34 views

Running easily replaceable water line underground

I'm running a trench out to my shed for electrical. I'd like to use the same trench for a water line so I can have a spigot back there, and possibly future sprinklers. I'd also like to make it fairly ...
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1 vote
1 answer
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PVC leak under slab in outdoor waterfall feature

I've searched the internet for a solution to my problem and I can't find anything that even references a potential fix. Maybe one doesn't even exist, but I have to try, right? So, here is my problem....
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2 votes
1 answer
191 views

GFCI and other concerns for 1500 foot wiring run

I have the following: My house with 400a service A pond subpanel 300 feet away from house fed from 100a breaker A barn 500 feet from pond subpanel currently run by a 12v offgrid solar system that has ...
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1 vote
2 answers
138 views

Wrong voltages on underground cable

Asking for a friend who's not too big on the internet... ;-) Background: On a farm. 1000' underground three wire power run to a well. Buried about 3 feet down. There is about 200' of three black ...
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0 votes
2 answers
63 views

Leak in boiler system

Have concrete slabs heated with an HTP boiler. 4 manifolds (2 supply, 2 return w/shutoffs). Had a loss of pressure and low water pressure error on boiler. I have isolated the leaks off the manifolds. ...
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2 votes
3 answers
11k views

How bad is using a 200 amp breaker box on a mobile home that only has 100 amp underground wire?

I just found out my parents breaker box is 200 amp in there mobile home but the underground electrical service line is 100 amp. The mobile home park has existed since 1979 and landlord has said ...
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2 votes
4 answers
5k views

Will water damage a spliced coaxial cable?

I have some R6 coaxial cable that runs from the alley underground and into my house to provide high speed internet and TV service. The line was cut by mistake while digging in the backyard. I've ...
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1 answer
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Inground trashcan hinge

I am trying to search for the in ground trashcan hinge. I've tried searching online for the part but don't know the correct name of it. Very hard to come by locally. The lid where it attached is about ...
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1 vote
0 answers
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Inground trashcan missing neck

I have two in ground trash cans that are missing the neck where the hinge attaches to the lid. When it rains, water gets in and fills the hole. I have a 32 gallon plastic trash can that I put in and ...
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12 votes
3 answers
6k views

How to bury electrical wiring

I know I can run indoor wire underground as long as it is protected in something, but can I use a water hose to run it through instead of conduit or PVC?
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1 vote
2 answers
1k views

Does the NEC regulate data cable bury depth?

Technically my jurisdiction follows the 2016 California Electric Code, but it's mostly just the 2016 NEC. Table 300.5 lists bury depths for various areas and wiring methods. Do these apply to data ...
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1 vote
1 answer
365 views

How do I couple IMC underground?

The title, more or less, sums it up. I plan to bury some THHN/THWN-2 feeders, and my jurisdiction allows a 6" bury depth if I use IMC or RMC. I plan to use IMC, which comes with both a male and female ...
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3 votes
1 answer
610 views

Have Shed/Man Cave & Need Unground Power Advice

I have a shed which is a little less than 100 feet from my home breaker box. I currently am poor-manning it running a 100 foot extension cord out there. I have already purchased a branch electrical ...
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1 vote
2 answers
502 views

Placing wooden box underground; how to protect?

I'm getting ready to start working on my property this summer and instead of hauling a bunch of tools back and forth all the time, I'm going to build a large wooden box to keep all that stuff ...
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5 votes
2 answers
339 views

Can I use a ground rod as an equipment ground for a detached garage?

I'm in a bit of a dilemma. The house we bought has a detached garage supplied by 12/3 UF with ground. The previous owner/handyman set this up as a multiwire branch circuit (MWBC) with a twist: one ...
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0 votes
0 answers
871 views

wiring up new detached garage

K.I.S.S. Keep it simple stupid. Please remember this when responding because I have very little knowledge of home electrical, mechanic by trade. My House has a 200amp service panel House panel runs ...
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1 vote
0 answers
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Department store PT GC lumber

I'm using pressure treated, ground contact lumber like this one bought from Home Depot for an outdoor project in my backyard. Parts of the lumber are buried underground, and some of the buried ends ...
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1 vote
2 answers
697 views

Cabin Wiring Plan Revisited

OK, So I’ve update my wiring plan … see images. I have more details now, such a part numbers, specifications and ratings, etc. I’ve consolidated much input from a couple of forums as well as Stack, ...
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2 votes
2 answers
6k views

Code for Buried Comms Cable

Are there any code requirements for buried communications cable (coax for TV/Internet)? Rockdale County, GA if it makes a difference. I have some jokers contractors at my house today who are supposed ...
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