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Old 08-05-2012, 01:22 PM   #1
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Depth of Sch 80 PVC under pavers?


Can someone help me understand 2008 NEC, 300.5? I'd like to bury Schedule 80 PVC with #6 THWN's under a paver walkway to a subpanel in an outdoor building. There will be an 8" space between the pavers and the outdoor building perimeter.


I thought I had to bury it 18", but according to 300.5, Column 3, Row 2, it looks like 12" would be allowed. Then for the 8" space between the pavers and the building, I could pour at least 2" of concrete when I pour the building's foundation/slab. Would this meet code?

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Rick

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Old 08-05-2012, 01:58 PM   #2
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Depth of Sch 80 PVC under pavers?


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Can someone help me understand 2008 NEC, 300.5? I'd like to bury Schedule 80 PVC with #6 THWN's under a paver walkway to a subpanel in an outdoor building. There will be an 8" space between the pavers and the outdoor building perimeter.


I thought I had to bury it 18", but according to 300.5, Column 3, Row 2, it looks like 12" would be allowed. Then for the 8" space between the pavers and the building, I could pour at least 2" of concrete when I pour the building's foundation/slab. Would this meet code?

Thanks.
Rick
Interesting, but I don't think I would call a paver an equivalent of 2" thick concrete.

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Old 08-05-2012, 02:06 PM   #3
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Depth of Sch 80 PVC under pavers?


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Interesting, but I don't think I would call a paver an equivalent of 2" thick concrete.

That's what I was hoping to clarify. Is there any way to find out what they mean by equivalent?
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Old 08-05-2012, 02:26 PM   #4
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Depth of Sch 80 PVC under pavers?


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That's what I was hoping to clarify. Is there any way to find out what they mean by equivalent?

Why not just pour concrete over the entire trench? As far as your question, ask your inspector if he finds that to be equivalent.

Personally I think I would just dig down the extra 6 inches...

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Old 08-05-2012, 03:22 PM   #5
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Depth of Sch 80 PVC under pavers?


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Why not just pour concrete over the entire trench? As far as your question, ask your inspector if he finds that to be equivalent.

Personally I think I would just dig down the extra 6 inches...

I don't have a problem digging the extra 6 inches. My concern is encountering my home's concrete foundation's footer that may interfere with the downward travel before I reach the 18" depth. Have you had that situation before?
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Old 08-05-2012, 03:29 PM   #6
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Depth of Sch 80 PVC under pavers?


The protection depends on the type of pavers. I they are cheap, large (over 12" wide or long), that would a little difficult to show the equivalency since they do not interlock and can be removed quite easily. The strength of the is usually unknown, since no standards exist. If they are the smaller interlocking pavers (about 4"x8" in various shapes), they would typically be 2-3/8" thick and be 8000 to 10,000 psi. They are difficult to remove if installed correctly.

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Old 08-05-2012, 03:36 PM   #7
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Depth of Sch 80 PVC under pavers?


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I don't have a problem digging the extra 6 inches. My concern is encountering my home's concrete foundation's footer that may interfere with the downward travel before I reach the 18" depth. Have you had that situation before?

Around here the footings are 8' down. So no, cant say that I have encountered that.
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Old 08-05-2012, 03:38 PM   #8
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Depth of Sch 80 PVC under pavers?


IMHO, since the pavers are removable unlike a 2" concrete pour, I'm going to have to decline that they are equivalent.
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Old 08-05-2012, 03:40 PM   #9
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Depth of Sch 80 PVC under pavers?


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The protection depends on the type of pavers. I they are cheap, large (over 12" wide or long), that would a little difficult to show the equivalency since they do not interlock and can be removed quite easily. The strength of the is usually unknown, since no standards exist. If they are the smaller interlocking pavers (about 4"x8" in various shapes), they would typically be 2-3/8" thick and be 8000 to 10,000 psi. They are difficult to remove if installed correctly.

Dick
I plan on using the small pavers. But, I don't mind digging deeper. In the event I meet my home's concrete footer while digging down, before I reach the 18" depth, I may have some problems.
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Old 08-05-2012, 03:42 PM   #10
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Depth of Sch 80 PVC under pavers?


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IMHO, since the pavers are removable unlike a 2" concrete pour, I'm going to have to decline that they are equivalent.
I think you are right and the inspector may have the same opinion.
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Old 08-05-2012, 04:03 PM   #11
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Depth of Sch 80 PVC under pavers?


Can you not use pressure treated lumber as mechanical protection south of the border?

Mechanical protection shall consist of one of the following and, when in flat form, shall be wide enough to extend at least 50mm beyond the conductor, cables, or raceways on each side: (a) treated planking at least 38mm thick; (b) (c) (d) (e) poured concrete at least 50mm thick; concrete slabs at least 50mm thick; concrete encasement at least 50mm thick; or other suitable material

Sorry the copy and paste from adobe to forum using phone jumbled it up. Be aware that's a cec rule
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Old 08-05-2012, 04:09 PM   #12
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Depth of Sch 80 PVC under pavers?


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Can you not use pressure treated lumber as mechanical protection south of the border?
Thats not an option under 300.5.

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Old 08-05-2012, 06:54 PM   #13
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Depth of Sch 80 PVC under pavers?


If you hit your footings, you will have to offset the conduit anyway, so go the extra 6".
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Old 08-05-2012, 07:28 PM   #14
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Depth of Sch 80 PVC under pavers?


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If you hit your footings, you will have to offset the conduit anyway, so go the extra 6".

Yep, I'm okay with that. I'll be digging it next week and will know if I need to make an offset. I've never done that before so I'll probably check back here when and if I need to.

Unless, someone can give me some advice now on doing an offset. Would that be done with heating the tubing or through glued connectors?
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Old 08-05-2012, 07:55 PM   #15
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Depth of Sch 80 PVC under pavers?


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Yep, I'm okay with that. I'll be digging it next week and will know if I need to make an offset. I've never done that before so I'll probably check back here when and if I need to.

Unless, someone can give me some advice now on doing an offset. Would that be done with heating the tubing or through glued connectors?
Either way, but with out a heater, glued connectors would be good.

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