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Old 07-02-2012, 10:24 PM   #1
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Default PVC under cement walkway

Still have an older code book. Doing a job where we need to run a 20a line under a side walk in a restuarant. I could use ridgid and wrap it 6 ", or can I use PVC under cement? Does it need to be schedule 40 or 80? Do I have to go 12" or can it be 6 " with the ridgid PVC? schedule 80.
thx, Al
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Old 07-02-2012, 11:12 PM   #2
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Still have an older code book. Doing a job where we need to run a 20a line under a side walk in a restuarant. I could use ridgid and wrap it 6 ", or can I use PVC under cement? Does it need to be schedule 40 or 80? Do I have to go 12" or can it be 6 " with the ridgid PVC? schedule 80.
thx, Al
2011 Code:
Pvc= 18"
PVC under 2" concrete= 12"
PVC under 4" concrete (no vehicles)=4"

Sch 80 req coming out of ground (seal in 1st JB)

I like 4" concrete w/ 4" cover. Just pour it dry over PVC, next day it's done.
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Old 07-02-2012, 11:51 PM   #3
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2011 Code:
Pvc= 18"
PVC under 2" concrete= 12"
PVC under 4" concrete (no vehicles)=4"

Sch 80 req coming out of ground (seal in 1st JB)

I like 4" concrete w/ 4" cover. Just pour it dry over PVC, next day it's done.
Did they change under slab?
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Old 07-03-2012, 12:42 AM   #4
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Did they change under slab?
Under a building, the cover requirement is 0", per table 300.5 (under 600V)
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Old 07-03-2012, 01:09 PM   #5
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Old 07-03-2012, 03:41 PM   #6
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You're asking the wrong question. What happens when the pipe comes out from under the walk?

Well, at that instant the pipe has to be 24" deep. How do you plan on getting it there?
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Old 07-03-2012, 04:01 PM   #7
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You're asking the wrong question. What happens when the pipe comes out from under the walk?

Well, at that instant the pipe has to be 24" deep. How do you plan on getting it there?
You lost me..Code ref. please
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Old 07-03-2012, 04:15 PM   #8
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You're asking the wrong question. What happens when the pipe comes out from under the walk?

Well, at that instant the pipe has to be 24" deep. How do you plan on getting it there?
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You lost me..Code ref. please
Amish has the depth for PVC (18") confused with that for direct-buriable cable (24"), but his point is valid if the conduit is going to cross from being under a concrete walk, for example, into a yard. You can put it at 4" down under the walk but it has to be at 18" as soon as it's under dirt.
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Old 07-03-2012, 04:23 PM   #9
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Amish has the depth for PVC (18") confused with that for direct-buriable cable (24"), but his point is valid if the conduit is going to cross from being under a concrete walk, for example, into a yard. You can put it at 4" down under the walk but it has to be at 18" as soon as it's under dirt.
It doesn't make sense..with that reasoning how would come out of the ground w/ PVC into a meter?
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Old 07-03-2012, 04:45 PM   #10
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It doesn't make sense..with that reasoning how would come out of the ground w/ PVC into a meter?
Apples -v- oranges. Transitions to above ground are supposed to be vertical. Amish was referring to horizontal runs. Would you emerge from under a concrete pad at 4" depth and then transition to 18", or would you make that dive while under the pad, so you're at 18" as you cross to the dirt? The former would result in insufficient cover for the length of the transition. I see no leeway in code for this, though I've often been granted some by ahj's.
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Old 07-03-2012, 04:58 PM   #11
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Apples -v- oranges. Transitions to above ground are supposed to be vertical. Amish was referring to horizontal runs. Would you emerge from under a concrete pad at 4" depth and then transition to 18", or would you make that dive while under the pad, so you're at 18" as you cross to the dirt? The former would result in insufficient cover for the length of the transition. I see no leeway in code for this, though I've often been granted some by ahj's.
Most sidewalks are 4" thick..why not trench 4" down after you leave the sidewalk to the point you want to go vertical and pour concrete over it?
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Old 07-03-2012, 05:51 PM   #12
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Whats a "line"?
"hey baby, you must be tired cause you have been running through my mind all day". Best used while wiggling your eyebrows....
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Old 07-03-2012, 06:17 PM   #13
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Most sidewalks are 4" thick..why not trench 4" down after you leave the sidewalk to the point you want to go vertical and pour concrete over it?
So if you had 100' to go until your riser, you would pour 100'x 4'' x trench width of concrete?
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Old 07-03-2012, 07:28 PM   #14
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So if you had 100' to go until your riser, you would pour 100'x 4'' x trench width of concrete?
Depending on the circumstances that would be one way to do it.

If I had to use a trencher I would go down 18" (or 24" street) per T300.5 and forget about concrete.

I would also drop a warning tape 12" above buried service conductors per 300.5 D3
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Old 07-03-2012, 07:46 PM   #15
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Depending on the circumstances that would be one way to do it.

If I had to use a trencher I would go down 18" (or 24" street) per T300.5 and forget about concrete.

I would also drop a warning tape 12" above buried service conductors per 300.5 D3
So if you are trenching along at 18" and come to a sidewalk you would still keep it at 18" under the sidewalk and continue on the other side at 18" until you reach your destination. I believe that is what Amish is trying to convey. You would not go up to 4" under the sidewalk but keep it at 18".
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Old 07-03-2012, 07:57 PM   #16
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So if you are trenching along at 18" and come to a sidewalk you would still keep it at 18" under the sidewalk and continue on the other side at 18" until you reach your destination. I believe that is what Amish is trying to convey. You would not go up to 4" under the sidewalk but keep it at 18".
In that case if the sidewalk was pretty narrow I would try to stay about 18" down and do a horz. bore under the sidewalk. It would be crazy to change elevation, just because of a sidewalk.

If the job was sitting on a bedrock, I would wouldn't use chipping hammers to get down to 18" either. After 50 years I've found every job is different.
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