![]() It actually makes us look good, that the contractor can only find one thing we've "overdesigned" and it doesn't amount to anything./DS (font: Arial,sans-serif 12.0pt text-align:left \ncolor:#000000)ฤก.00000 0.00000 0.00000 1.00000 0.00000 1.63673 Tm So we laugh, and say put it in per design. Typical concrete-encased duct bank detail highlighting the evaluated design considerations outlined in this article. So we have them quantify the amount the owner will save, and it invariably comes out to $5000 or $10,000. Side note: Whenever we have a VE (Value Engineering) phase on a project, the first thing the contractor wants to eliminate is duct bank reinforcing. There's no real design, but I have used the reinforcing to span the duct bank over a temporary trench. in order to facilitate heavy cable pulling. A number of manholes has to be located all 100-150 ft. Usually it is done even before the supplied equipment is located. The process begins with the crew digging the trench. In my opinion, concrete embedded duct bank it is a convenient solution for a long run of lot of different cables: medium voltage, low voltage, control and instrument cables. Avoid harsh pours of concrete directly on the duct bank assembly. Secure by looping the entire duct bank with tie wire or by securing the ducts to the spacers and reinforcing bars, if used. Once again, the process for encasing Direct Burial and Encased Burial PVC Utility Duct in cement is basically the same as the cement encasement process for Schedule 40 and 80 PVC Pipe. POURING CONCRETE Ensure the duct bank is stable and secure before pouring concrete. They're reinforced with #4's around the perimeter at 12 inch spacing and #4 ties at 24 inch centers. DB Direct Burial & EB Encased Burial Cement Installation. ![]() ALL PRIMARY AND SECONDARY CONDUITS SHALL BE MINIMUM DB-100, CONCRETE ENCASED PER. ![]() ![]() There's a lot of casual concrete (waste concrete, thrust blocks, foundation extensions, etc.), but if the backhoe operator sees red, he's been warned. GUIDE FOR CONDUIT SIZE-DUCT BANKS-MINIMUM. Figure 301.60 on page 272 of the handbook has a note (bottom left) which reads 'Note: Minimum burial depths to top electrical ducts or cables shall be in accordance with 300.50. TYPE, SIZE & NUMBER OF CONDUITS, SIZE TO SERVICE BOX OR PULLBOX, &. There's a lot of reasons that don't hold up to close examination, but bottom line is, that if you're in a water or wastewater treatment facility, you're likely to be digging a trench through it or a hole into it. Im looking in the code to find minimum depth requirements for both 5kV and 35kV duct banks. USE ENCASED-BURIED (EB) CONDUIT FOR ALL CONCRETE-ENCASED INSTALLATIONS. We reinforce electrical duct banks and require them to be red. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |