This electrical detail shows a four-conduit concrete ductbank measuring eighteen inches square with four four-inch conduits arranged in a two-by-two configuration. The red concrete encasement mix consists of three sacks of cement and ten pounds of red oxide or one gallon of red color per cubic yard of sand for medium-voltage installations. Warning tape is positioned above the encasement, with a minimum burial depth of thirty-six inches for voltages above six hundred volts and twenty-four inches for voltages below six hundred volts. Concrete cover dimensions maintain three inches typically at the top, sides, and bottom, with five and one-quarter inch and seven and one-half inch spacing between conduits.
NOTES WARNING TAPE FOR MEDIUM VOLTAGE DUCTBANKS ONLY. RED CONCRETE ENCASEMENT CONSISTING OF 3 SACK OF CEMENT AND 10 LBS OF RED OXIDE (OR 1 GALLON OF RED COLOR) PER CUBIC YARD OF SAND FOR MEDIUM VOLTAGE DUCTBANKS ONLY. WARNING TAPE REFER TO SURFACE REPLACEMENT DETAILS ON SHEET EXXX VOLTAGE DUCTBANK DEPTH ABOVE 600V 36" MINIMUM BELOW 600V 24" MINIMUM 4" 4" 4" 4" 1 1 2 2 18" FOR DEPTH SEE TABLE BELOW TYP. 5 1/4" TYP. 3" 5 1/4" 7 1/2" 5 1/4" 18" TYP. 3"
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