The savings in time, labor, and time-to-completion are dramatic – allowing construction teams to complete underground infrastructure in record time. With RED-E-DUCT and appropriate construction planning, up to 14,000 conduit feet can be installed per shift and trenches can be backfilled as soon as the RED-E-DUCT sections are installed. ![]() Lay rates up to 14,000 conduit-feet per shift (8-hour workday) The need for concrete testing is eliminated at the job site, since quality tests are performed and recorded at Forterra’s certified precast facility. Solvent cements are not required to join the sections, and no formwork, steel reinforcement, or concrete work is required on straight duct bank runs. Added together, the traditional process is slow, labor-intensive, and subject to weather delays.īy contrast, the RED-E-DUCT Precast Electrical Duct Bank System consists of electrical conduits encased in engineered, prefabricated concrete sections, arriving at the job site ready to install. Finally, concrete must be poured and sufficiently cured before work in the area may resume. Dependent upon design requirements, reinforcing steel may be required to be placed around the PVC conduits. Concrete formwork must be erected around the installed conduits. In traditional underground duct bank installation, multiple PVC conduit runs are “stick-built” with individual sections of PVC conduit connected in sequence using PVC solvent cement. With significant time, cost, and labor savings, construction teams can complete underground installations faster, restoring site access more quickly while enhancing worker safety. Irving, TX, June 2020 – With the rollout of its RED-E-DUCT™ Precast Electrical Duct Bank System, Forterra is changing the way underground electrical duct bank systems are installed. However, since control, instrumentation and communication cables run in separate steel conduit which - if it will be well bonding could create, also, a grounding effective path for power cables in the same duct bank.Parul Dubey on Jin News, Products, Technology However, in this case, grounding with individual cable ground conductors (see 5.5.3.2) should be considered to avoid installation and bonding complications." When the cable is run underground, this grounding conductor should be located in the same direct burial or duct bank run as the cable. It is important that the ground conductors be run as close as possible to the circuit conductors, since this reduces the reactance of the fault current return path. The separate grounding conductor is run in the same conduit or cable duct as the outgoing power cable and is also used to ground the conduit or cable duct. ![]() Where a single cable leaves the cable tray, a branch grounding conductor is added and connected to the common grounding conductor and to the equipment enclosure or motor terminal box. It is usually a bare stranded copper conductor connected to the main ground bus and fastened to the cable tray. A common equipment grounding conductor could be used for all cables in the same tray (it may also be used to ground the cable tray). From this main ground bus, a grounding conductor is run within the same raceway as the circuit conductors. It should be noted that in systems with impedance grounding, the grounding conductors should be connected to the neutral ground and not to the transformer neutral. This may be the switchgear or the motor control center ground bus to which the supply transformer neutral is connected (solidly or through impedance) and that is solidly connected to the grounding grid. ![]() "It is recommended that a main ground bus be provided. I am sure it could be also in other standards however this is what I found in "my collection".įrom IEEE-665 GENERATING STATION GROUNDING 5.5.3.1 Grounding with common equipment grounding conductor run to the neutral ground.
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