concrete encased 69 conduit duct bank design

Concrete encased 69 conduit duct bank design install#
Concrete encased 69 conduit duct bank design full#
Concrete encased 69 conduit duct bank design code#

Once more, CANTEX PVC Pipe Solvent Cement needs to be applied with a dauber in between each run.Ĥ. Once again, the entire installation process needs to be repeated for every 10 or 20 feet, depending upon the length of the conduit.ģ.

Concrete encased 69 conduit duct bank design full#

See the CANTEX Full Product Line Catalog for determining the NEC 70 spacer requirements for the necessary trade size of the spacers and the required separation space. The rows of CANTEX PVC Intermediate Spacers are connected for every row of pipe. The concrete ductbanks are commonly used in many seismic regions throughout the world. The amount of spacers coordinates with how many rows of conduit are being installed. ABSTRACT: The paper focuses on full-scale experimental and numerical study of underground concrete ductbanks. Once the trench is completed, CANTEX PVC Base Spacers must be placed in rows in the trench. The process begins with the crew digging the trench.Ģ. 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. Once all the runs of PVC DB Conduit are in place and properly connected, the crew fills the trench with dirt.ĭB Direct Burial & EB Encased Burial Cement Installation

Concrete encased 69 conduit duct bank design install#

Install 4/o bare copper ground cable the length of the duct bank to be used to connect the manholes to grounding system. Furnish and install a Danger High Voltage sign at each manhole, cable chamber, junction box, pull box, and vault. This process is repeated every 10 to 20 feet, depending upon the length of the conduit.ĥ. Install a metal lined, plastic, 6' wide warning tape 18' above all raceways and duct banks. The pipe is twisted slightly to secure it. Once the pipe is smooth, the correct type of CANTEX PVC Solvent Cement gets applied to the inside of the belled end and the outside of the spigot or “straight” end of the conduit with a dauber.Ĥ. ducts with adapters designed for purpose and encased concrete. If the pipe has been cut, a reamer tool must be used to remove burrs or debris before cementing. Underground conduits are both underfloor conduits and duct bank conduits. In between each run of pipe, the belled end of the conduit gets cemented to the straight end.

A crew begins by digging a trench for the conduit.Ģ.

Concrete encased 69 conduit duct bank design code#

The code in the area allows for either concrete encased duct.

The existing bldg already has direct burried PVC ducts stubbed out from the electrical room. Consequently, the ends of the DB PVC Conduit runs are directed into and terminate in approved electrical devices or boxes. Say you are subfeeding a new building (bldg A) from and existing building (bldg B), but to do so the feeder needs to cross a road (future road) to reach the new building. For example, smoother select fill dirt would be used as back-fill and there are no above-ground applications for Direct Burial PVC Conduit. DB Direct Burial PVC Utility Duct InstallationĪlthough the direct burial installation for DB PVC Utility Duct is very much the same as it is for Schedule 40 and Schedule 80 PVC Pipe, there are some differences in back-fill requirements and performance capabilities.