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Old 08-19-2012, 05:33 PM   #1
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When do you use expansion couplings in PVC?


I'm trying to determine if I need to use expansion couplings in my install. This installation is in California where the climate is pretty mild with no severe temperature changes.

I'm running schedule 40 1" in a crawlspace about 40', out to an LB, buried in schedule 80 18" for about 5' then up into a workshop wall.

I've read the sections in the 2008 NEC, but I'm not sure if I need this.

Can someone enlighten me on this subject?

Thanks.
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Old 08-19-2012, 05:40 PM   #2
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When do you use expansion couplings in PVC?


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Originally Posted by RM575 View Post
I'm trying to determine if I need to use expansion couplings in my install. This installation is in California where the climate is pretty mild with no severe temperature changes.

I'm running schedule 40 1" in a crawlspace about 40', out to an LB, buried in schedule 80 18" for about 5' then up into a workshop wall.

I've read the sections in the 2008 NEC, but I'm not sure if I need this.

Can someone enlighten me on this subject?

Thanks.
I dont think you need one in your scenario. If the ground was going to freeze i would recommend one, but I think you are fine.
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Old 08-19-2012, 05:43 PM   #3
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When do you use expansion couplings in PVC?


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I dont think you need one in your scenario. If the ground was going to freeze i would recommend one, but I think you are fine.

Thank you. One less thing to worry about is nice.
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Old 08-19-2012, 05:50 PM   #4
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When do you use expansion couplings in PVC?


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Thank you. One less thing to worry about is nice.
If you think the material is going to expand more than 1/4" you better use one though, you would be surprised how far it moves!
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