Underground pvc condulet

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highendtron

highendtron

Senior Member
I have an underground run of 1/2" pvc sc40 that needs to go 170' with (6) 90's. I would like to install "c" condulets to break the 90's up, but it looks like article 314.29 prohibits putting them underground (not accessible). The owner does not want exposed junction boxes, but needs three #12 circuits. I could probably use uf cable and may have to go that way. Any thoughts?
 
Can you "sweep" the conduit through any of the areas you are working in. Why are you using such a small raceway?
If I put something in the ground I start with 1" unless its impossible.
I usually use a plastic "Brooks Box", if the HO wants to let the grass grow over it, their isnt much you can do about it.
 
1/2" pvc is a major mistake at that distance. For one you will want to take VD into consideration assuming you are using the pipe for electrical.

You could install an inground water meter box at one of the sweeps.

052063010007md.jpg
 
I like Dennis's idea. A cheap sprinkler box will work fine. After you're all done the HO can remove it if he likes. I also would consider a larger raceway for the aforementioned voltage drop possibility.
 
jrannis said:
Can you "sweep" the conduit through any of the areas you are working in. Why are you using such a small raceway?
If I put something in the ground I start with 1" unless its impossible.
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I agree, PVC is cheap, trenching is expensive, save your self some headache and run bigger conduit. I also agree about sweeping the conduit, do you really need a tight ninety degree radius? PVC doesnt have to be ran in a perfect straight line or right angles, you can snake it around almost like a gardenhose.
 
Dennis Alwon said:
You could install an inground water meter box at one of the sweeps.

052063010007md.jpg
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I like the idea but actually you can't install a 'water box' or sprinkler box for this.

The NEC requires the cover to be identified, see 314.30(D).

You need to get an electrical hand-hole.
 
Underground pvc conduit

Underground pvc conduit

Dennis Alwon said:
1/2" pvc is a major mistake at that distance. For one you will want to take VD into consideration assuming you are using the pipe for electrical.

You could install an inground water meter box at one of the sweeps.

052063010007md.jpg
Click to expand...

Dennis that's a good idea
I also agree with Dennis about running 1/2"
I never run anything smaller than 3/4" no matter what
Semper Fi Buddy
 
iwire said:
I like the idea but actually you can't install a 'water box' or sprinkler box for this.

The NEC requires the cover to be identified, see 314.30(D).

You need to get an electrical hand-hole.
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Can't you just write electric on the water box with a permanent marker. The one I used needed a tool to open. Would that not cover 310.30(D)
 
Dennis Alwon said:
Can't you just write electric on the water box with a permanent marker. The one I used needed a tool to open. Would that not cover 310.30(D)
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I think that could meet the requirement but would be up to the inspector.

IMO permanent marker or paint will not last considering the environment, likely direct sun, rain, maybe snow, foot traffic etc.

We can get cheap hand holes the size a gallon paint can that have "ELECTRIC" molded into the cover off the shelf at the local supply house.

That said, I have used a sharpie to label outdoor equipment so I should not be throwing stones here. :smile:
 
highendtron said:
I The owner does not want exposed junction boxes, but needs three #12 circuits. I could probably use uf cable and may have to go that way. Any thoughts?
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Not knowing your complete scenerio, you could be in violation of article 225.30.
Rick
 
220/221 said:
This is what we use for flush mounted underground jb's.

pvc664.jpg


3/4" is fine but don't use UF, please.
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Many of those Carlon boxes are not listed for in ground use. I found one that was but I still put the water box over it.
 
I've always used a 12x12 Quazite and the lids are marked "ELECTRIC", not what I would want in my back yard though

maybe for a JB, use a rocket post and give the guy a receptacle at a convienant location?
 
I looked at 225.3 and then looked at "other structures" in the definitions (2005) to see if it included decks and I think I am fine. I think the use of " other structures" may need clarification, but I think its intention is buildings/sheds/garages/houses...Changed directions on my outside work and think I found a way to access the opposite end of the house without the trenching...won't need the boxes/uf/ or trench, but will remember the tips!!!!
 
That would have been one heck of a trench (170') from one end of a house to the other. Wow. Big house and you had to go an indirect route I would guess
 
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