1" Rigid Conduit

[35mastr]

I need to cross a 2 foot cement walkway. Could I run this inside of the cement for the 2 feet. I push my cherry picker through there and I am afraid I will break the plastic conduit where it comes up out of the ground if I use the plastic conduit.

 

[rockwithjason]

there is some argument as to what the burial depth needs to be. the greatest consensus seems to be that the pipe needs to be 12 inches below grade. if the walkway is narrow i usually tunnel under it and feed the pipe thru. ridgid is a good choice for this because it's hard to kill.

 

[35mastr]

I actually cut a two inch path for it. Then I will just fill it after I run the conduit.

 

[Wingnut65]

The sidewalk cut and repair will be the weakest spot in the sidewalk. I'd be concerned that too much weight across the patch could push down unevenly since there is only a cold joint connecting the sidewalk.

If the conduit is inside the sidewalk, then the depth of the concrete will be reduced by the conduit diameter. The sidewalk would most likely crack across the width above the conduit.

I agree with Jason that burried would be better. I was told for my landscape lighting that 18" down was a normal depth. You could bury it 12" and fill the rest with concrete to the top of the sidewalk. That shoudl be strong.

 

[mrb]

if you use rigid metal conduit the burial depth is 6" if it has 2" of concrete on top. You will have to figure out how to transition to proper depth outside the walkway, probably 45 in GRC to a 45 pvc.

 

[mrb]

there is some argument as to what the burial depth needs to be. the greatest consensus seems to be that the pipe needs to be 12 inches below grade. if the walkway is narrow i usually tunnel under it and feed the pipe thru. ridgid is a good choice for this because it's hard to kill.

why is there argument? table 300.5 is pretty clear........

 

[35mastr]

I was going to run 1" ridgid hung on unistruit all the way to the shop from there.

 

[mrb]

I was going to run 1" ridgid hung on unistruit all the way to the shop from there.

im confused

 

[pattenp]

Just a FYI if you are not aware. If using pvc conduit in areas above ground that may be subject to damage you need to use SCH-80.

 

[rockwithjason]

why is there argument? table 300.5 is pretty clear........

one would think so but you know how it is with the code. cut and dry to one is grounds for argument to another.

 

[Gooch]

one would think so but you know how it is with the code. cut and dry to one is grounds for argument to another.

no, it's very clear, there is no grounds for argument, if using RMC or IMC, use Column 2 of table 300.5. find the applicable installation on the left, and it only gives one measurement. It's not vauge like 'Likely to become energized.'

if installing in the concrete it needs to have an envelope of atleast 2" of concrete. This means you have to have 2" of concrete around the entire outside of the RMC.

and as said, you will need to transition down to 6" after coming out of the slab.

 

[rockwithjason]

no, it's very clear, there is no grounds for argument, if using RMC or IMC, use Column 2 of table 300.5. find the applicable installation on the left, and it only gives one measurement. It's not vauge like 'Likely to become energized.'

if installing in the concrete it needs to have an envelope of atleast 2" of concrete. This means you have to have 2" of concrete around the entire outside of the RMC.

and as said, you will need to transition down to 6" after coming out of the slab.

and it begins.

 

[Gooch]

and it begins.

give me an argument as to why it would be any different? so far you just claim there is an argument, yet make no actual argument.

 

[Aceman]

if you use rigid metal conduit the burial depth is 6" if it has 2" of concrete on top. You will have to figure out how to transition to proper depth outside the walkway, probably 45 in GRC to a 45 pvc.

For rigid, unless it's crossing a driveway or some type of parking lot, the burial depth is 6" whether it has 2" of concrete on top of it or not. Row 1 & 2 list the depth.

I have no idea how RockwithJason is coming up with 12" as that's not even a burial depth listed under the column for rigid conduit.

 

[rockwithjason]

For rigid, unless it's crossing a driveway or some type of parking lot, the burial depth is 6" whether it has 2" of concrete on top of it or not. Row 1 & 2 list the depth.

I have no idea how RockwithJason is coming up with 12" as that's not even a burial depth listed under the column for rigid conduit.

it was the end product of many wasted hours of meaningless argument with clueless people over the years. sometimes all people base things on is opinion and they swear up and down it's fact. I am will mrb's assesment of the situation as that is how i read it too.

 

[oleguy]

300.5 table

 

[35mastr]

Is there any sealer or pipe dope that needs to be put on the threads for this conduit that is going to be exposed to the weather?

 

[Aceman]

Is there any sealer or pipe dope that needs to be put on the threads for this conduit that is going to be exposed to the weather?

No. If you cut fresh threads, you can hit those with cold spray galvanize, but we don't.

 

[mrb]

Is there any sealer or pipe dope that needs to be put on the threads for this conduit that is going to be exposed to the weather?

no. remember, conduit is for physical protection (and sometimes EGC) water is going to get in it one way or another.