![]() ![]() Shorter installation times and lower total costs make RED-E-DUCT the right choice for large-scale government and municipal projects. 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. I spoke with one of the engineers at work and his interpretation was since the under traffic dimension is given 'without concrete encasement', the 'below 2 inch thick concrete' dimension (12 inches deep) negates that dimension. 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. Re: Concrete Encased Duct Bank (under 600V). ![]() Complete below grade work faster with RED-E-DUCT. Standard precast duct bank sections and stub-ups reduce labor requirements, improve safety and provide maximum construction flexibility. It might require AHJ’s interpretation and approval. Rapid installation and backfill permits above ground work to start earlier. The NEC does not specify what approved manner is for the conductor protection. Low thermal resistivity concrete ensures duct banks in high heat applications can be trusted to perform. In order to get the proper cover over the top of. 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. NEC Table 300.5 provides minimum cover requirements for wiring methods and. Some ideal applications of RED-E-DUCT precast electrical duct banks include: I'm not in the IEEE anymore, but their IAS used to have such stuff.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. Conduit shall be straight and true and shall be furnished in a minimum length of 10 feet. The conduit size and quantity shall be as indicated on the Drawings. Still, I say this only as an experienced electrician (37 yrs), and can't refer you to any papers or studies to support my recommendations, although I'm sure some exist. Concrete Encased Conduits: Concrete encased conduit shall be Schedule 40 PVC and comply with UL 651 Schedule 40. If your area has flooding or other factors present even rarely, PVC conduits in particular can float and move enough to damage your "duct bank", which could nullify any initial savings. Red colored concrete encasement, where required, shall use a red pigment integrally mixed into the. Where required concrete encasement shall be either 2000 psi or 3000 psi. Installation parameters are prescribed in Table 1 below. A multi layer formation would make compaction of dirt difficult, I'd recommend something similar to "pea gravel" in the conduit formation with a denser cover layer and, if flotation is possible, at least planks of concrete, no less than 4" thick with some re-bar in the planks.Ĭonsider your soil conditions carefully. Use GRS (galvanized rigid steel) or PVC schedule 40 for underground conduit and duct bank installations. I would definitely advise considering possible damage in the area, and would also say that 2" of concrete wouldn't even be worth the pour! I admit this is only my opinion, but 2" wouldn't bear any weight or impact, or prevent any flotation. I've been told, whenever I've asked, that it's simply "what's been spec'd" but these locations have always been where other utilities were nearby, and heavy industrial conditions and occupancies were present. ![]()
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