Concrete Encased Electrical Duct Bank

554 2 ft 3 20 5 yd 3.

Concrete encased electrical duct bank.

Bld concrete encased duct bank. Page 5 of 8 underground electric distribution standards. Volume of duct bank. Duct line a length of duct s encased in concrete and intended to stabilize protect and serve as conduit for electric or communications cables.

Minimum concrete coverage on left. Page 4 of 8 underground electric distribution standards. Typical concrete encased duct bank. Provide maximum clearance of 1 5 inches from bars to edge of concrete encasement.

The concrete contractor said that he usually spaded the concrete around the ducts. Minimum concrete coverage on right. Load density is significant. Additional circuits will be added routinely.

Minimum concrete coverage on bottom. Concentration of circuits via the same route are planned or expected. Duct transition a change that occurs in a duct when its relative position in a conduit line or section at one terminating point is different from that at the opposite terminating point. Concrete encased duct bank iv.

Boxes and not concrete manholes. Install duct bank reinforcement as shown or indicated on the drawings. The ascc hotline was almost stumped by a hotline call where the concrete contractor was placing concrete for underground electrical duct banks. Do not use concrete blocks or other means to support and space conduits that are to receive concrete encasement.

A metallic backed marking tape shall be installed 12 above all underground conduits and duct banks. The concrete encased electrode must comply with the requirements of 250 52 a 3 and the hold down bolts must be connected to the concrete encased electrode by means of welding exothermic welding the usual tie wires used to secure the rebar in a footing or other approved means fig. Concrete encased underground electrical duct banks. Cables installed in concrete encased pvc duct this type of system is typically used in urban areas where.

554 2 ft 3 20 5 yd 3. Concrete encased ductbank iv. For concrete encased conduits use manufactured pvc spacers and mounts for support and spacing of the conduits.