Emt Conduit Installation Guide' title='Emt Conduit Installation Guide' />Conduit and innerduct increase cable system capacity. Barbara E. Thompson. In outside plant installations, conduit is typically installed underground to protect cables from damage and to facilitate cable placement for immediate and future needs. You can also install conduit inside buildings to facilitate pulling cable between two points such as from the telecommunications closet TC to work area outlets, or from an equipment room to a TC. To protect, isolate, and identify the cables, innerduct also known as subduct may be installed inside existing larger diameter conduit. Conduit is defined as a rigid or flexible metal or nonmetallic raceway through which cables can be pulled. In addition, although conduit can be used to house many types of cable, the National Electrical Code NEC uses the term optical fiber raceway in Article 7. Hp Laserjet M1005 Mfp Printer Driver For Windows 8. Several types of conduit are available, such as electrical metallic tubing EMT, rigid metal conduit, PVC, fiberglass, and flexible conduit. For premises installations, how ever, metal flexible conduit is not recommended because of potential abrasion damage to the cable jacketing. Native AdvertisementMetal conduit, which typically comes in 1. Nonmetallic conduit is available on reels in longer, continuous lengths that do not have to be joined as often. The only problem with installing EMT conduit is that it requires a special skill set and training, in addition to lots of practice or you end up making swing sets, explains Kevin Smith, project manager at MTS Services Bedford, NH. Metal conduit comes in 1. Arnco Corp. Elyria, OH sells innerduct to the cable TV, telecommunications, and electric utility markets, says Tom Stewart, electrical products sales manager. Inside a building, several types of duct are used for example, riser and plenum rated but all our products are manufactured from thermoplastic materials, such as polyvinylide fluoride pvdf and polyvinyl chloride pvc. The thermoplastic materials are easier to install than metal. Where to use innerduct There are three different types or ratings of innerduct outdoor, riser rated, and plenum rated. Robert Jensen, engineering manager at Endot Industries Inc. Rockaway, NJ, explains Outdoor is usually polyethylene and its not really rated. Then theres a riser product, rated by Underwriters Laboratories UL, which is generally a thermoplastic material such as polyethylene or PVC with fire retardant chemicals added to it. How to buy, install, and inspect electrical conduit used for wiring. A simple guide to electric conduit wiring for homeowners. How to install and inspect electrical. Water Heater Bracing Page 3 of 12 Division of the State Architect rev. Methods for Earthquake Bracing of Water Heaters for Residential Use. The Association of Electrical Equipment and Medical Imaging Manufacturers. Let me state up front that I probably wont be able to help you out much if you decide to build your own wind turbine. This web site has become insanely popular. SEMI manufactures quality electrical flexible conduit,liquid tight conduit,heavy series over braided flexible conduit,pvc coated flexible metal conduit,flexible. Greenlee 1818 Mechanical Bender for EMT, IMC, Rigid and Aluminum Conduit. Electrical conduit, whether it be metal EMT, plastic PVC, or flexible conduit, each has their own maximum number of electrical wires allowed in the conduit. Their. And the third type of duct is UL plenum rated, generally a pvdf product, which is fire retardant and smoke resistant, says Jensen. According to Mike DErrico, regional director of sales at Pyramid Industries Erie, PA, most products that conduit and innerduct manufacturers make is for outside plant. Some manufacturers offer prelubricated innerduct and conduit, very often incorporating some form of silicon, he says. For premises cabling, Pyramid offers a plenum raceway tested to UL 9. UL 1. 66. 6 for installation in vertical shafts. In addition, the riser product is halogen free and is often used for military, shipboard, or tunnel applications, depending upon the specifications. Of course contractors install conduit where building codes require it, but also where the cabling system needs physical protection or protection from unauthorized access. We use conduit in riser and backbone systems from the building entrance to the main distribution frame, says Karl Clawson, senior vice president and partner, Clawson Communications Greenwood, IN. And we also install it for horizontal cabling, especially in university campuses. In the living quarters, we install cable in conduit because it gives the cable extra protection, and hopefully, keeps it out of students reach, he says. Some cabling contractors prefer to have other trades install conduit for example, electricians who have more experience in performing this task. Generally, the only time we use conduit is when were building a riser or penetrating a fire wall, says Smith. Typically, we would not install conduit from the wiring closet to the workstation outlet. For short distances, as much as 1. Different features. In addition to the traditional smooth bore type, innerduct is available with a ribbed inner wall to reduce friction between the cable sheath and the innerduct wall. Garmin Canada Inland Lakes Ontario Free more. A wave rib on the inside of the duct reduces surface contact between the cable and the wall of the duct, thus reducing the coefficient of friction and allowing you to pull cable over longer distances, says Stewart. Another variation is the multicelled conduit system, which offers outerducts with pre installed innerducts. Clawson says that, because of its cost, his company does not use conduit with pre installed innerduct. We keep leftover conduit in stock to use on other jobs, he says. But pre installed conduit is a special application, so overages and underages are kind of costly to deal with. For premises applications, Dura line Knoxville, TN has designed a conduit, known as Hex line, for multiple duct applications between buildings. As you pull the ducts off the reel two to each reel, they go into a collector, which Dura line supplies free of charge, says Ray Mc. Leary, vice president of sales. Each duct has a male and female part, which are snapped together, making a multiple duct system. This saves time, space, and money, but the most important savings is space. He explains Normally, you can put three 1 inch innerducts into a 4 inch conduit. With this system, you can fit four 1. Dell Perc 6/I Driver Windows Server 2003 R2 more. When purchasing innerduct, you also need to be concerned with its tensile strength and crush resistance. The thicker the wall material, the higher the tensile rating, says Stewart. If youre going to pull it over a long distance, select a wall thickness that allows you to pull the duct over that distance. The crush resistance feature helps to ensure that the innerduct wont be damaged during the placing process or you cant pull in the cable, he explains. Because of the limited amount of tensile pull that you can exert on the cable, people look for ways to reduce the coefficient of friction inside the conduit. There are products on the market such as prelubricated conduit, says Stewart. And theres even a different technology being used for placing cable, known as air blown fiber or ABF, where the fiber optic cable is blown into the conduit. We manufacture what we call the air trak system a conduit system with chambers for use in ABF installations. Air blown fiber is available in the United States from Sumitomo Electric Lightwave Corp. Research Triangle Park, NC. Size and capacity. Conduit and innerduct have one thing in common They facilitate pulling or replacing a cable for added capacity in a premises cabling system. However, every contractor knows that as an installation grows, the number of cables grows to fill all the space in the conduit. Therefore, choosing the correct trade size is important, because you must leave sufficient clearance between the walls of the conduit and other cables see the eiatia 5. Typically, conduit trade sizes range from 12 to 6 inches in diameter. Minimum conduit size recommended for backbone cables is 4 inches. Sufficient clearance must be available to allow pulling the cable without excessive friction or bending. The NEC conduit fill tables define the amount as a percentage of different types of cable you can use inside a conduit.