Special PVC expansion joint?

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jjhoward

jjhoward

Senior Member
Location
Northern NJ
Occupation
Owner TJ Electric
Is there a special expansion joint that can be used with 3" PVC directly below the meter pan?
I thought I had seen this in a CE class I took last year.
It wasn't a standard thermal xpansion joint mounted vertically, it was specifically for absorbing ground shifts and the 90 degree sweep was part of the assembly.
Am I dreaming this stuff up or does this exist???

Thank you.
 
They are required around here by all the different power companies. They come in a "coupling" version - which gets inserted in the middle of your riser, and in a "connector" version which obviously attaches to the bottom of your can. The 3" on is about 18" long as I recall. The 5" ones aren't much fun. They take up too much room.
 
Ok. Can you tell me who makes these things?
Here in NJ, my 3 suppliers only offer me the thermal xpansion joints. I have contacted Carlon, but have not found anyone there who knows about anything other than the thermal joints.
 
The actual term here is " expansion coupling " and they are made by Carlon, Cantex and Krayloy in my area. Here is the Cat# for a 2" Carlon fitting: E955J. Hope this gets you going in the right direction.
 
Hi Tom,
Thank you for the info.
Seems that these are all "thermal" expansion joints as well.
Which is fine.
I am thinking that that is all there is....A thermal expansion joint doesn't really care why the conduit is moving, so why should I??

Maybe what I saw was simply a thermal expansion joint installed vertically. That would absorb ground movement/heaves during frost or settling. Maybe I am searching for something that doesn't exist. 8)
 
The local POCO, XCEL ENERGY, shows these fittings in their service manual but for whatever reason, they don't enforce their use. I just met with a designer from the POCO and I asked him if I was required to use the slip sleeve and he basically said " no ". Up here, we commonly get 2-3 feet of frost so maybe the fact that we don't use 90's but rather just go staight down with the PVC about 18" below the ground level for the service lateral to come up through is the reason.
 
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