Or cut the driveway and put the speed bump over the small trenchIf you install a speed bump over the conduit, the conduit is now buried and you have to follow the burial rules. This will result in a tall speed bump.
The proper way to do this is to run the pipe under the driveway. You can dig a ditch on one side and use a pipe connected to a water hose to water bore your way through to a smaller ditch on the other side. Or you can cut and patch the driveway.
The small but *deep* trench.Or cut the driveway and put the speed bump over the small trench
In that case, I guess you only need to consider whether it is still protected from damage.What if you use RMC and leave the top 120 degrees exposed, with the speed bump butting into it on both sides? Then it's not buried. : - )
Cheers, Wayne
What if you use RMC and leave the top 120 degrees exposed, with the speed bump butting into it on both sides? Then it's not buried. : - )
Can you give code specifics that would allow this? Everything I've seen says 24" below driveway or roadway. I've been told reasoning behind extra depth for driveway is there is more chance of excavation and resurfacing later and the little extra depth gives a little extra protection from incidental damage during such construction.What if you use RMC and leave the top 120 degrees exposed, with the speed bump butting into it on both sides? Then it's not buried. : - )
Can you give code specifics that would allow this?
Does the NEC disallow installing GRC on the driveway w/out cover? When you are looking for physical protection, one method of achieving it has been to use GRC.There is no statement in the NEC that allows this. That's not how the NEC works. You are allowed to do whatever you want as long as the NEC doesn't say you can't.
I asked that same question in post 8 above. (GRC=RMC). AFAIK, the NEC does not specifically prohibit running rigid over a driveway, but it does require conduit to be physically protected from damage. I personally would not do it. Even if the pipe didn't collapse from the weight of the vehicle, I suspect the threaded area would break from the stresses.Does the NEC disallow installing GRC on the driveway w/out cover? When you are looking for physical protection, one method of achieving it has been to use GRC.
I think that would be an acceptable solution. The pipe is both protected and visible. I think I would still check with an inspector before doing it.What about running conduit in a 'trench drain' or similar under surface open cavity. The conduit is not hidden underground, and is protected by the structure of the drain.
Don't install speed bumps. They're ineffective against speeders and a nuisance to everybody else.