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Old 05-28-2011, 03:42 PM   #1
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Sealing an underground conduit for future use


We just converted our overhead electric service line to underground and I was thinking that while I still have an open trench I'd like to put another conduit in the trench for future use, like cable for internet/tv/phone or some combination of those.

We are currently reviewing our internet/tv/phone options but haven't made a decision and don't want to leave the trench open too long.
The electric is all done, passed the inspections and is in use, we just need to backfill the trench.
I was thinking that 1" non-metallic aboveground-underground sch40 pvc would be appropriate for a typical underground cable?
It's about a 30' run with typical 10' sections of pvc I'll have some joints, and I'm not sure what if anything should be used on the joints to seal them.
I'm going to also ask my electrical contractor that installed our underground electric but thought I'd ask here too.

Thanks for all input,
Bob

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Old 05-28-2011, 04:46 PM   #2
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Sealing an underground conduit for future use


You GLUE the joints with PVC cement. Then glue a cap on the end, to keep out excess moisture.

Be sure to measure where the end is, so you can dig it up later when/if the time comes that you want to utilize it.

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Old 05-28-2011, 04:52 PM   #3
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Sealing an underground conduit for future use


Thanks!
Sounds pretty obvious but to someone like me with little to no electric experience, I needed to ask.
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Old 05-28-2011, 05:23 PM   #4
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Sealing an underground conduit for future use


Cap the end with enough stub sticking up, so you do not have to put a slip collar over when you finish. Even easier to just finish the run, and put in the pull box, then later on if you decide when to finish, everything is done. Just leave a pull string in the line to make things easier when you get around to pulling the lines.
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Old 05-31-2011, 09:22 AM   #5
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Sealing an underground conduit for future use


Finished up with the extra 1" pvc.
I left enough sticking up out of the ground at both ends so I wouldn't have to dig it up later and capped the ends I also got some string and although I didn't leave string in the installed pvc I did a quick test with my shop vac, the string and some of the pvc, and the shop vac pulled the string through pretty easy so I'll just put the string in later when I'm ready to pull a cable through.
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Old 05-31-2011, 09:37 AM   #6
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Sealing an underground conduit for future use


Put a 5 gallon shop bucket over it or something else to protect it if it is sticking out of the ground, so it does not get broken off.
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Old 05-31-2011, 09:53 AM   #7
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Sealing an underground conduit for future use


Thanks for the suggestion.
One end comes out of the ground up against the house exterior wall and the other end comes out of the ground up against the garage exterior wall so it's pretty safe from being accidently knocked around.
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Old 05-31-2011, 10:01 AM   #8
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Sealing an underground conduit for future use


You never know what may happen. Always good to protect with something, regardless. No need having it get damaged and water get into the line.

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