If the duct bank is 100 feet, then the total volume of concrete needed is 3.215 square feet times 100 feet, which equals 321.5 cubic feet of concrete. ![]() Now multiply this number by the total length of the duct bank. By dividing 462.96 by 144, the result is 3.215 square feet. This is the cross-sectional area occupied by the concrete alone.Ĭonvert the cross-sectional area occupied by the concrete from square inches to square feet by dividing that number by 144. So, 576-square inches minus 113.04 square inches equals 462.96 square inches. ![]() Subtract this number from the total cross sectional area of the duct bank. For a three-by-three, that is 3.14 times 4 times 9, which equals 113.04 square inches. The conduit area is pi times the radius squared times the number of conduits. The conduit area would be the cross-sectional area of one conduit times the number of conduits. Underground Electric Distribution Standards CONCRETE ENCASED DUCT BANK I. Now subtract from this number the total area occupied by the conduit. In this three-by-three example, that would equal 24 inches times 24 inches or 576 square inches. Multiply the total width and total height. Since this is a three-by-three duct bank, its height will also be 24 inches.Ĭalculate the cross-sectional area of the duct bank. Repeat step 2 using the number of vertical conduits instead of the number of horizontal conduits. Shorter installation times and lower total costs make RED-E-DUCT the right choice for large-scale government and municipal projects.Calculate the total height of the duct bank. All RED-E-DUCT products are rated for HS20 and HL93 loading. Rapid installation and immediate backfill make RED-E-DUCT ideal for projects where restoring traffic access is imperative. RED-E-DUCT’s extreme strength and performance allows for much shallower bury depths when compared with cast-in-place, resulting in lower costs and fast rate of construction. Immediate backfill means faster access to above ground work to keep projects moving forward. RED-E-DUCT shines in congested areas where schedule savings can yield big results on a project. This item shall consist of underground electrical conduits and duct banks (single or multiple conduits encased in concrete) installed in accordance with this specification at the locations and in accordance with the dimensions, designs, and details shown on the plans. RED-E-DUCT’s low thermal resistivity adds peace of mind by reducing the risk of premature cable failure due to inadequate backfills, poor installation practices and high thermal temperatures. Complete below grade work faster with RED-E-DUCT. costs (5,490,000) would be covered by the FAA and 5 (305,000) would be. Standard precast duct bank sections and stub-ups reduce labor requirements, improve safety and provide maximum construction flexibility. Rapid installation and backfill permits above ground work to start earlier. Low thermal resistivity concrete ensures duct banks in high heat applications can be trusted to perform. ![]() Whether building a new facility or replacing existing infrastructure, RED-E-DUCT’s immediate backfill capability means work completes faster and site congestion is reduced. Some ideal applications of RED-E-DUCT precast electrical duct banks include: Engineered for efficiency, RED-E-DUCT is the solution to the complex underground duct banks demanded by oil, gas and chemical facilities, power generation, industrial facilities, airports, data centers, and road/highway projects.
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