Table 300.5

[mshields]

Table 300.5 defines fill requirements for direct buried conduit. What are the rules when that conduit is encased in concrete. For example, if I use RGS I can be as shallow as 6 inches. What about PVC concrete encased?

 

[Dennis Alwon]

The table is set up to use the part which affects your install. PVC can be installed at 18" below grade where there is no vehicular traffic and 4 inches when it is below 4" thick concrete with no vehicular traffic. There are other possibilities also.

 

[Dennis Alwon]

Column 3 and then look to the left to see what your install would be.

 

[mshields]

hmm

hmm

first of all - thanks for taking time on a Sunday to answer this!!!

Now, I had looked and am looking at Column 3 right now, and none of these categories quite fit, it seems to me, a concrete encased duct bank. UNLESS, you use the Under 4 inches of contrete category.

Should I infer from that that if I want to use a comlete concrete encasement, the top of that should be 4 inches thick?

 

[Dennis Alwon]

Mike I am still not sure what you are using. Is it a duct bank or is it pvc?

 

[mshields]

Clarification

Clarification

It's 8 - 4 inch PVC conduits encased in concrete. i.e. what I would call a duct bank.

 

[Dennis Alwon]

If the pvc has 2" of cover over the top of the pvc then 12". If there is 4" of concrete and no vehicular traffic then 4"

 

[mshields]

awesome

awesome

Thank you very much!!!