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Old 04-16-2011, 11:43 AM   #1
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Expansion joints for electrical conduit


I have my pvc conduit buried and I am ready to run the pipe into the house. Do the expansion joints go above or below the level of ground?

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Old 04-16-2011, 12:55 PM   #2
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Expansion joints for electrical conduit


I don't know why you would need them in either location.

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Old 04-16-2011, 12:58 PM   #3
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Expansion joints for electrical conduit


I have never used them before.
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Old 04-16-2011, 03:54 PM   #4
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Expansion joints for electrical conduit


Above the ground

http://www.ipexelectrical.com/Conten...rue&FileId=440

Last edited by hpp58; 04-16-2011 at 04:04 PM. Reason: Added Link
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Old 04-16-2011, 06:51 PM   #5
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Expansion joints for electrical conduit


Like mentioned they go above ground. Make sure when you glue them in place that the expnasion is in the middle(usually has some time of mark) so that it can move up and down.
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Old 04-16-2011, 10:43 PM   #6
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Expansion joints for electrical conduit


Must be a snow country thing, never seen or heard of them being used in the south.
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Old 04-16-2011, 11:35 PM   #7
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I have always used them where PVC came out of the ground and was subject to the earth moveing with the frost.
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Old 04-17-2011, 12:01 AM   #8
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Expansion joints for electrical conduit


I have used in quite few spots either in horztonal or vertical fashon for expanding coupling or sleeve.

One is from coming from the ground when you have pretty serious frost level.

Second is I used on very long run on PVC pipes on surface mount { above ground } then I will instal one or more depending on length.

I know they are not cheap but they can justifed the cost to prevent any damage to the conduit or junciton box or meter box which I use them below the meter socket that is one of few spots I expect to see damage there with hevey frost movement.

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Old 04-17-2011, 05:33 AM   #9
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Expansion joints for electrical conduit


Thank you for the replies. Once I got thinking about it, it makes sense to place them above groung so they can do what they are designed to do. Again, thanks for the help, doing it yourself is saving me big $$$. Of course, I am having an electrician check all of my work prior to hooking up to the service panel.

Brian
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Old 04-17-2011, 11:24 AM   #10
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Of course, I am having an electrician check all of my work prior to hooking up to the service panel.

Brian
Thats what they all say.
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Old 04-17-2011, 11:30 AM   #11
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Expansion joints for electrical conduit


I always use them for PVC burials. I always questioned whether I needed them until I saw that the marking line actually changes with the change in seasons. Maybe it's not much of an issue in the warmer southern states but up in the northeast it definitely matters.
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Old 04-17-2011, 11:40 AM   #12
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It makes sense, even though they cost $15 for each, I could just see my schedule forty crack while the ground is heaving. That would end up costing me much more. Better safe than sorry!
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Old 04-17-2011, 11:42 AM   #13
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Thats what they all say.
My favorite drinking buddy is a master electrician and will work for beer.
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Old 04-17-2011, 08:28 PM   #14
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"Must be a snow country thing, never seen or heard of them being used in the south."

It's not a snow country thing. It's A "code" thing 352.44. Thermal expansion can be worse in the south that the north.
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Old 04-17-2011, 10:17 PM   #15
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Expansion joints for electrical conduit


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"Must be a snow country thing, never seen or heard of them being used in the south."

It's not a snow country thing. It's A "code" thing 352.44. Thermal expansion can be worse in the south that the north.
I don't know how we have made it all these years without them, I've been a lineman for 25 years and have seen hundreds of URD service installations and still regularly work in underground subdivisions and have never seen a problem with conduit without expansion joints in it, for that matter we have hundreds of thousands of feet of conductor buried in conduit from manholes to risers up poles and not 1 expansion joint. Don't know about the code thing as we fall under a different set of rules, but I would have thought the electrician's around here would have if it applied to this area.

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