am I understanding the code correctly that if I dig a trench with a required burial depth of 18" for my situation and a large rock is crossed at a depth of 12 " all I need to do is pure some ready mix cement on the 3/4" PVC covering it 2" extending to the rock and I have met the code requirements or do I really need to Jack Hammer the Rock ?
PVC in a ditch with a rock
- Thread starter 69jag
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bphgravity
Senior Member
- Location
- Florida
Re: PVC in a ditch with a rock
The idea is to protect the raceway from potential damage from digging above. Proper cover performs this function but in cases where proper cover cannot be acheived other suitable methods should be available that will perform the same function. 2" concrete over the shallow portion of the underground installation should suffice.
The idea is to protect the raceway from potential damage from digging above. Proper cover performs this function but in cases where proper cover cannot be acheived other suitable methods should be available that will perform the same function. 2" concrete over the shallow portion of the underground installation should suffice.
marinesgt0411
Senior Member
- Location
- Naples,FL 34110-9285
Re: PVC in a ditch with a rock
Remember that two inches of concrete has to INCASE the conduit which means it has to be under the conduit as well
Remember that two inches of concrete has to INCASE the conduit which means it has to be under the conduit as well
- Location
- Massachusetts
Re: PVC in a ditch with a rock
Table 300.5
No not in this case.
Table 300.5
The 2" encasement comes in at 230.6 'conductors considered outside of buildings.
allenwayne
Senior Member
Re: PVC in a ditch with a rock
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Remember that two inches of concrete has to INCASE the conduit which means it has to be under the conduit as well .
2 ins of concrete has to cover the pipe.
( In a trench covered by 2 in/50 mm of concrete or equivalent ) I can`t find that the concrete has to encase the conduit.
300 6 B says in concrete or in direct contact with earth.
Table 300.5 note 5 allows you to install conduit under a slab when solid rock is present 2 in below grade but the concrete has to extend to the rock also (maybe this note is where the encased in concrete came came from )
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Remember that two inches of concrete has to INCASE the conduit which means it has to be under the conduit as well .
2 ins of concrete has to cover the pipe.
( In a trench covered by 2 in/50 mm of concrete or equivalent ) I can`t find that the concrete has to encase the conduit.
300 6 B says in concrete or in direct contact with earth.
Table 300.5 note 5 allows you to install conduit under a slab when solid rock is present 2 in below grade but the concrete has to extend to the rock also (maybe this note is where the encased in concrete came came from )
allenwayne
Senior Member
Re: PVC in a ditch with a rock
Well Roger within 30 sq. miles It depends what jurisdiction you are in !
Pasco , Hernando , City of temple terrace only require door # 1 . But I`d use door # 2`s #4 Only hecause of having to protect door #1`s ,# 6.Just not worth the time for a couple of cents more in material.
Pinellas, and Hillsboro are sitting Behind door #2 with # 4 and youre ok.
City of Tampa behind door #3 with 1/0
I hope that makes it a bit clearer,especially since there is supposed to be a uniform code
Means of grounding are more confusing than what size wire we are required to use :roll:
Well Roger within 30 sq. miles It depends what jurisdiction you are in !
Pasco , Hernando , City of temple terrace only require door # 1 . But I`d use door # 2`s #4 Only hecause of having to protect door #1`s ,# 6.Just not worth the time for a couple of cents more in material.
Pinellas, and Hillsboro are sitting Behind door #2 with # 4 and youre ok.
City of Tampa behind door #3 with 1/0
I hope that makes it a bit clearer,especially since there is supposed to be a uniform code
Means of grounding are more confusing than what size wire we are required to use :roll:
allenwayne
Senior Member
Re: PVC in a ditch with a rock
Roger when I get back to work after this surgery I had on monday.I will contact him.If I remember this correctly,250.66 shows 1/0 for grounding conductor.That is what they are citing.
If I had it my way #4 all the way so I don`t have to protect the # 6.A few midget straps smd 3/4 shot pins.Done deal but this is Florida and some of what goes on here is ridulous.
I am sure you have seen in other posts how cockeyed some inspectors have their heads screwed on around here.
Don`t get me wrong, There are allot of good inspectors but I guess like anywhere else there are the bad ones and some are just great to work WITH. :roll:
Roger when I get back to work after this surgery I had on monday.I will contact him.If I remember this correctly,250.66 shows 1/0 for grounding conductor.That is what they are citing.
If I had it my way #4 all the way so I don`t have to protect the # 6.A few midget straps smd 3/4 shot pins.Done deal but this is Florida and some of what goes on here is ridulous.
I am sure you have seen in other posts how cockeyed some inspectors have their heads screwed on around here.
Don`t get me wrong, There are allot of good inspectors but I guess like anywhere else there are the bad ones and some are just great to work WITH. :roll:
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