Questions tagged [underground]

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3answers
6k views

Running Cable Underground in PVC Conduit - Do I bond the PVC segments before pulling the wire through?

I have the PVC segments with the flanges at one end, and a relatively short (under 50ft) run, but its very bendy at the ends. My initial thought was to pull the cable through the pieces one by one, ...
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1answer
76k views

What size wire do I need for a 100amp underground 300 ft run?

I want to put in a 100amp subpanel in my garage. The run will be underground and 300ft long. I have a Siemens panel with breakers rated at 60/75 deg C. What is the proper wire size I need? I was ...
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2answers
76 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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1answer
35 views

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 ...
23
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4answers
7k 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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2answers
60 views

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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1answer
56 views

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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1answer
78 views

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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2answers
221 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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1answer
82 views

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?
12
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5answers
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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2answers
200 views

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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0answers
37 views

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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3answers
87 views

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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2answers
106 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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2answers
4k views

What is the best way to run underground electrical and low voltage in the same trench?

I'm putting in a couple of new electrical lines for my back yard. I have a trench dug from point A, to B, to C, etc.. I then had a bright idea. Why don't I put speaker wires and CAT6 under ground ...
5
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5answers
429 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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2answers
53 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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1answer
231 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 ...
2
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0answers
31 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 ...
12
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3answers
5k 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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2answers
93 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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1answer
3k views

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 ...
2
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1answer
98 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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3answers
10k views

What is the maximum depth below grade for termite activity?

I'm endlessly revising my perimeter footing insulation project and need to know: how far below grade do subterranean termites tunnel? These would be normal subterraneans, not formosans. For some ...
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3answers
3k views

Can I build an electrical pole structure to hold a power wire into my property?

The power pole to my house is at the back right corner of the property. However, it's a little outside my property line. I wanted to run a power line straight down along the pole and into the ground ...
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2answers
113 views

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?
2
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2answers
535 views

Reduce speed of existing well pump

My existing well pump (at 550 ft deep) is a nearly brand new (installed last July) 3 wire pump and I do not want to replace it. However, I now have a 1500 gallon underground cistern in which to store ...
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3answers
1k views

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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1answer
462 views

Requirements for adding outdoor outlets

I would like to run a line of outlets on the front side of my house. Ideally there will be: 1 circuit of outlets that are always on for general use 2 circuits of outlets that are on timers, one for ...
13
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2answers
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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0answers
28 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 ...
2
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2answers
2k 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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0answers
33 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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1answer
56 views

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....
2
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1answer
168 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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2answers
121 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 ...
6
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2answers
51k views

Buying a House On Underground Spring. What to do?

My fiancé and I are under contract on a new home which we are concerned it might be built on an underground spring. There are two sump pumps in the house, on opposite corners of the house. Both times ...
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2answers
2k views

DIY trenchless technology -- what options would be suitable?

I have seen, on occasion, folks on this site whose situation would call for the use of some flavor of trenchless technology -- this guy is the most obvious example, but others have come up. However, ...
2
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3answers
9k 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 ...
2
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4answers
4k 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 ...
2
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2answers
5k 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 ...
0
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1answer
54 views

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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0answers
43 views

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 ...
1
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1answer
311 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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2answers
873 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 ...
3
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1answer
571 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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2answers
436 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 ...
5
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2answers
304 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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0answers
864 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 ...