Such as tied or welded re-bar and about installing bare ground wires in concrete. Once again nothing has changed. Herbert G Ufer •In 1942, Herbert G. Ufer was a consultant working for the U.S. Army. There is conflicting information about how it should be done. (Ufer is not an abbreviation by the wa. Rule 10-700 Grounding Electrodes - IAEI Magazine Rebar, #4 bare or 2 ground rods spaced 6 feet apart. Ufer discovered that concrete had better conductivity than most types of soil. 5. be wet signed and stamped by that Engineer. What in the World is a Ufer Ground? - EVstudio Enter the CEE or UFER ground. This has sometimes been referred to as a "ufer ground," named for the person who dreamed up the idea. This is an electrode developed by using electrically conductive reinforcing bars or bare copper conductors not . Bonding sub-panel residential out building | Electrician Talk Posted by. may object grounding rebars for concern of accelerating corrosion or creating crack on foundation during lightning discharge. Older rules allowed a water main pipe to substitute for ground rods, but that is fading due to the use of plastic water mains. Grounding: Understanding the Essentials for Building the ... Ufer then developed a grounding scheme based The OP's pole does not meet the requirements as a ground rod or a Ufer. and he was given the task in world war II to find alternative ways for a new grounding system to protect buildings from lighting strikes. Are Ground Rods Needed if You Have a CEE? | The Building ... The Ufer ground . This has sometimes been referred to as a "ufer ground," named for the person who dreamed up the idea. The UFER ground consists of a ground wire connected to wire or a piece of steel that is imbedded in cast in place concrete which is in contact with the soil which acts as the ultimate ground. Any deficiencies found during inspection shall be photo'd and documented by the inspector in the notes section of iWorQ. . Verify that there is a concrete wash out piton site. Policy Regarding: Off Hours Building Inspections The use of steel reinforcement as a "Ufer" ground electrical - Home Improvement Stack Exchange For a building that has another type of foundation, an effective alternative is to simply drill an 8- to 12-in . 19. Ufer is the name of the engineer who created it as a solution to significant grounding problems discovered by the U.S. military. I came across this APC product page for Microsol Isolator Modules, which purportedly provide "safe power in places with poor or nonexistent grounding."The unit is meant for Brazil, so it won't work in my case, but I'm wondering what the underlying technology or implementation is and if it provides some kind of "virtual ground" to simulate an actual ground. (A)3 has a revision included which is entitled " Informational Note ". Jul 21, 2018. It clearly needs grounded. Foundation Rebar Ground. We also drove a ground rod right outside the house at the point where the new ground wire entered the foundation. EMT conduit heading into dirt is NOT an acceptable substitute for a Grounding Electrode. There are #4 slab dowels 12" o.c. Ufer was given the task of finding a lower cost and more practical alternative to traditional copper rod grounds for these dry locations. Originally, Ufer grounds were copper electrodes encased in the concrete surrounding ammunition bunkers. The requirements for a concrete-encased electrode, commonly called a "Ufer Ground" are included in 250.52(A)(3). Place the conductor on top of the ground enhancement material. in the NEC, a supplemental electrode is only required when the primary electrode is a rod, or metal water pipe, not when it is a concrete-encased electrode. The 2011 NEC no longer allows the structural metal to serve as a grounding electrode when supplemented by a ground rod. Answer: Yes. the narrative must include a detailed description of the actual UFER ground installation The letter must . I heard that the military used to use ground rods in and around their munition bunkers, but lightning strikes nearby sometimes caused some of their bombs to explode. In today's terminology, Ufer grounds consist of any concrete-encased electrode, such as the rebar in a building foundation, when used for grounding, or a wire or wire mesh in concrete. Ufer then developed a grounding scheme based In 1942, Herbert G. Ufer was a consultant working for the U.S. Army. My electrician failed to get his UFER ground wire tied into the footing rebar before we poured the footings. Ufer was given the task of finding a lower cost and more practical alternative to traditional copper rod grounds for these dry locations. It must be copper clad. When is an Ufer Ground required? This consists of an approved water-main bond, an Ufer ground into concrete reinforcing rod, or 2 ground rods (or 1 if it passes a test). #12. You might still need the normal ground. Ufer was given the task of finding a lower cost and more practical alternative to traditional copper rod grounds for these dry locations. to 6 in. The concrete-encased electrode is an electrode that uses a building's concrete structural components to establish a connection with the Earth. In the 2008 NEC Article 250.52 (A)3 identifies the requirement for a CEE. Subrule 2(b) — A bare copper conductor at least 6 m long, sized in accordance with Table 43 and buried in the earth at least 600 mm below finished grade is a brand-new alternative now permissible in the . Ufer discovered that concrete had better conductivity than most types of soil. In some areas (like Des Moines, Iowa) Ufer grounds are required for all residential and commercial buildings. CA [Extra] [VE] 1 year ago. The ufer was invented during World War II by Herbert Ufer, who was tasked with finding a cheaper alternative to the current method of grounding explosive ordinance storage structures against lighting strikes. Ufer was named after Herbert G. Ufer, he was the former western superintendent for Underwriters' Laboratories, In. but the alternative trade off may be worse. Metal Frame of the Building or Structure where the following methods are used to make an earth connection: (1,2,3,4) rod shall installed inside the concrete foundation attached to shaft or rebar at two places, 12" apart, cround rod . . If it is longer than 20 . 2y. Ufer discovered that concrete had better conductivity than most types of soil. Installation of ground enhancement materials. Such as tied or welded re-bar and about installing bare ground wires in concrete. In 1942, Herbert G. Ufer was a consultant working for the U.S. Army. but from outside the main powerline is one foot below ground and is inside a connector which is eroded. or footing that is in direct contact with the earth. save. Ufer ground. Ufer performed an 18 year study on the resistance of concrete-encased electrodes. ing a Ufer Ground system. Modern standard requires 2 ground rods at least 6 feet apart, unless a ground rod passes an expensive impedance test. Ufer was given the task of finding a lower cost and more practical alternative to traditional copper rod grounds for these dry locations. With that being said lets talk about the Concrete Encased Electrode (CEE). Keep in mind that the Ufer ground is an "equal" alternative to an 8' driven ground rod. 20m. For a building that has another type of foundation, an effective alternative is to simply drill an 8- to 12-in . Ufer discovered that concrete had better conductivity than most types of soil. At the end of the study in 1960, the average of 24 installations was 3.57 ohms, none ever exceeding 4.8 ohms over the 18 years. The technique is used in construction of concrete foundations. Dig a trench at least 4 in. . The best reading was 2 . Basically 25 ohms or less to ground is what they want. It uses a concrete-encased electrode to improve grounding in dry areas. Another alternative to rebar is the tension wire bundle used in commercial construction, it is stretched across the foundation and the ends have to . alternative ground connection methods shall be submitted for approval to the In the early 1940s, Herbert Ufer developed the Ufer ground, a method of obtaining a low-impedance ground in more arid soils without the use of one of the relatively costly, chemically enhanced grounding systems. An alternative would be to drive a single ground rod six or more feet from the UFER ground, ground the inverters and modules as described below with a 6 AWG bare copper grounding-electrode conductor and then bond the ground rod to the UFER with a 4 AWG bonding jumper (690.47(C)(1) in 2005 and 2011NEC). Ufer grounds, when present, are preferred over the use of grounding rods. In 1942, H.G. share. The technique Mr. Ufer came up with was necessary because the site needing grounding had no underground water table and little rainfall. Foundation Rebar Ground. The breaker box is tied directly to the ufer ground in the concrete of the basement. Consists of at least 20'of bare or zinc galvanized or other electrically conductive coated steel. So, you drive two, or use the Ufer. by Gary Coffma » Thu, 29 Aug 2002 01:56:38 >Gary . Also, an "Ufer ground", a rod cast into a concrete foundation, is about the best ground rod you can get! This is a concrete tilt-up and the pour back at the walls will be another foot with rebar all the way around. The entire troubleshooting process becomes much easier. Ufer was given the task of finding a lower cost and more practical alternative to traditional copper rod grounds for these dry locations. . Conductors from the tower legs to the radial system must have low inductance (large circumference) to direct lightning's fast rise time peak current towards ground with minimum voltage drop. " I convinced the customer to include a UFER ground while the slab was being poured". If you wanted a really good ground, you simply excavate your foundation to bedrock and use an UFER ground in the foundation concrete (it's a concrete encased ground electrode formed by electrically connecting the reinforcing steel in your concrete foundation - or a section of copper cable, but the steel is there and serves multiple purposes . Placement of ground enhancement material is quick and easy. Grounding Electrode System and Grounding Electrode Conductor Part III zNEC 250.50 (Grounding Electrode System) 250.52 Electrodes Water Pipe if 10 ft. or more of metal water pipe is in contact with the earth. In the early 1940s, Herbert Ufer developed the Ufer ground, a method of obtaining a low-impedance ground in more arid soils without the use of one of the relatively costly, chemically enhanced grounding systems. An alternative grounding method that has become popular here in Florida is an "Ufer" ground connection that is provided from concrete slab-encased or trench-laid metal rebar grids. A "Ufer" ground is slang for what the National Electrical Code (NEC) addresses as a concrete-encased grounding electrode. The main issue is that 250.52 (A) (3) (1) states: One or more bare or zinc galvanized or other electrically conductive coated steel reinforcing bars or rods of not less than 13mm (½) inch in diameter, installed in one continuous 6.0 m (20 ft.) length, or if in multiple pieces connected together by the usual steel tie wires, exothermic welding . The requirements for a concrete-encased electrode, commonly called a "Ufer Ground" are included in 250.52(A)(3). Subrule 2(b) — A bare copper conductor at least 6 m long, sized in accordance with Table 43 and buried in the earth at least 600 mm below finished grade is a brand-new alternative now permissible in the . . The electrician and I are in disagreement on what to do here. Ground Ring; A grounding electrode system is the connection to earth, through the code required grounding electrodes. 1. We forgot a dedicated Ufer in the foundation wall. ELECTROLYTIC GROUNDING ELECTRODES- Also known as a chemical rod- Commonly used in areas where the resistivity of the earth is high or where space is limited-. 20. Herbert G Ufer •In 1942, Herbert G. Ufer was a consultant working for the U.S. Army. I suggested bringing a #2 copper down the roof to a ground rod in the dirt, then pass a copper . A lot of new homes I have worked on required a "ufer" ground. . Answer (1 of 2): It's common procedure with post-tension slab system. The concrete encased electrode would be either the: " located within and near the bottom of a concrete foundation or footing that is in direct contact with the earth". Google "ufer ground" with the quotes. Please note I am talking about single family home here. The electrons in the ground use the electrons from the water in the concrete to flow into the soil. Jul 8, 2006. That's why a real Ufer ground requires the rebar to be >fully jacketed in concrete. Verify that concrete encased electrode(s) (UFER ground) are installed as close to the electric panel as physically possible. The first part of the footing is 1'-6" deep with continuous #4 rebar. From Wikipedia, the free encyclopedia. 9 comments. In 1942, Herbert G. Ufer was a consultant working for the U.S. Army. less than the rod length. In Idaho we require 2 ground rods 6 feet apart, ufer ground, metal water pipe ground , you may take your pick of any two of these methods. How CONNECT to a Ufer ground? That was as much to have a mechanical place to bond the shack ground as anything else as that ground rod was pretty insignificant electrically compared to the whole foundation serving as an Ufer ground. In 1942, Herbert G. Ufer was a consultant working for the U.S. Army. 4, in original article), auger a 3 in. The "Ufer" Ground. 21. It's quite normal for the Ufer* ground to daylight adjacent to the service equipment, and the grounding conductor connection (usually ground clamp) located. For installation around a ground rod (Fig. I just mounted an 8 foot Glenn Martin tower up over my roof. The grounding system is a beautiful redundancy of your neutral conductors. UFER grounds must meet NEC code and be inspected by an FEC designer or electrical inspector. In 1942, Herbert G. Ufer was a consultant working for the U.S. Army. your grounding electrode system must include at least one ufer (rebar) ground (if any), at least one one cold water pipe exiting the house underground (if metal), two ground rods at least 6 feet apart (one if a certain electrical impedance test qualifies it) and all other ground rods about that building and presently in use to ground other things … Spread out enough ground enhancement material (either dry or in a slurry) to cover the bottom of the trench, about 1 in. The desert site was a series of bomb storage vaults in the area of Flagstaff, Arizona. Ufer discovered that concrete had better conductivity than most types of soil. Ufer discovered that concrete had better conductivity than most types of soil. deep, or below the frost line, whichever is deeper. The zinc plated steel mentioned by Tom is not accepted by our local authorities. What is proper grounding? The building department here will accept 3 methods for the EGC. Ufer discovered that concrete had better conductivity than most types of soil. Then the water pipe is an "auxiliary electrode" per 250.54, and is therefore not required to comply with requirements of 250.50, 250.53(C) or 250.53(A)(2). Question on grounding my service w/ a 200A main panel and 200A sub panel: the electric company requires two 8' ground rods for the main panel. But the Ufer is a viable electrode by itself, and you are using it as your primary grounding electrode for this house. Ground-Fault Current Path — An electrically conductive path from the point of a ground fault on a wiring system through normally non-current-carrying conductors, equipment, or the . Copper wire does not function well as a "Ufer" ground due to the pH factor of concrete (+7pH is common). General. FEC will accept UFER grounds as an alternative to driving two copper ground rods. JoeBoyKey, yes Ufer ground is built in at build time, most houses built here are Ufer ground, not all areas accept Ufer ground, you really can't add Ufer ground to a existing foundation, it requires bonding of a certain length of rebar, probably 20 feet or so, this I'd determined at the planning stage before the build. You don't see them as often internationally. b) Some designer do not have any motivation for new challenger or incentive to reduce cost. If you are really dead set against opening the wallboard to look, then an alternative would be an inexpensive illuminated endoscopic camera for like $50 online. deep. As described in 250.52 (A) (3) a qualifying electrode: 1. You might still need the normal ground. As previously mentioned, any insulating barrier or vapor barrier prevents the Ufer ground from working. In Florida we are working from the 2008 National Electrical Code (NEC). Ufer was given the task of finding a lower cost and more practical alternative to traditional copper rod grounds for these dry locations. In 1942, Herbert G. Ufer was a consultant working for the U.S. Army. . 2. diameter hole to a depth equal to 6 in. An electrode encased by at least two inches of concrete, located within and near the bottom of a concrete foundation or . After selecting the material, consider the method of installation. General. The conductivity of the soil usually determines if Ufer grounds are required in any particular area. Contents 1 History 2 Construction 3 External links 4 References History However, an . The term "Ufer" does not appear in the Code, but many in the industry use it. Ufer was given the task of finding a lower cost and more practical alternative to traditional copper rod grounds for these dry locations. Ufer was given the task of finding a lower cost and more practical alternative to traditional copper rod grounds for these dry locations. He mentions the slab for his electrode. If tighter bends are required to get an overall lower inductance ground conductor, we recommend solid bond copper strap. Here not all electrician install it the same way. Think of the concrete as an intermediate ground that . Is encased by at least 2" of concrete and located within and near the bottom of a concrete foundation. Google "ufer ground" with the quotes. The testing for a single rod is too much of a hassle to deal with. Maybe it's a Ufer ground, and the wire going to the top of the wall doesn't come outside at all. As well as diagnostics. In 1942, Herbert G. Ufer was a consultant working for the U.S. Army. You keep doin' what you're doin, you will keep gettin' what you got. The . The Ufer ground only works when the concrete is directly contacting earth. Aug 14, 2009. partimer31 said: I would like to heard from follow Electricians, there best method of install-. It will make your home function properly, it also makes maintenance and repair to electrical systems much easier. That's why a real Ufer ground requires the rebar to be >fully jacketed in concrete. wide by 30 in. 1160 UFER Ground 1170 Post & eam 1180 Pilings/aissons 1190 Retaining Wall 1195 Structural oncrete-Framing 1220 Underfloor framing 1240 Reinforcing Steel 1260 Framing-Masonry 1350 Masonry onstruction 1360 Masonry Rebar 1370 Masonry Veneer 1380 Fireplace-Insulation 1400 Perimeter Slab Insulation 1410 Underfloor insulation Ufer was given the task of finding a lower cost and more practical alternative to traditional copper rod grounds for these dry locations. that are tied to the . Radials with ground rods must be attached to the Ufer to further lower the impedance and improve the ground . Snake it back there and confirm what's going on. Close. The technique is used in construction of concrete foundations. Glenn Martin Roof Tower Grounding. The term "Ufer" grounding is named after a consultant working for the US Army during World War II. Generally around here 2 ground rods are required. From Chrisd. ufer ground detail similar for cantilÛ.'er, butterfly, and overhead sign structures. It is required that the connection to the ground rod (usually ground clamp) must be accessible for inspection and maintenance. Some localities are requiring Ufer grounds now that plastic water pipe is the norm. How CONNECT to a Ufer ground? Archived. Concrete-encased electrode (UFER) Ground Exception. Often referred to as the Ufer ground, this method is very effective in making the connection to Earth. Radials with ground rods must be attached to the Ufer to further lower the impedance and improve the ground system's transient response. I zoned out after about 6 hours, but I still have the book). Ufer techniques are used in building footers, concrete floors, radio and television towers, tower guy wire anchors, light poles, etc. It has been shown that the "UFER" ground achieves 5 ohms or less. >Gary -- Top. The previous grounding method required driving hundreds of feet of electrical ground into the poorly conductive soils found in Arizona. The Ufer ground is an electrical earth grounding method developed during World War II. If you ever have a weird quirky problem in your house, and you have a ground…. Verify 911 Address signage. In the current edition of the 2011 NEC article 250.52. Once again nothing has changed. Copper is a better conductor than steel but the surface area of the rebar is much greater than the 25ft of copper. a) Ufer ground was recognized on the NEC as a good grounding method many years after ground rod been used. Note: If the UFER ground has not been detailed and specifically approved in the letter and was not visually inspected by the Building Division, a new UFER ground must be installed. >Gary -- Top. It uses a concrete-encased electrode to improve grounding in dry areas. BTW, Ufer grounds are somewhat unique to the US in that they were developed here. Another alternative to rebar is the tension wire bundle used in commercial construction, it is stretched across the foundation and the ends have to . Is the rebar used in concrete foundations and concrete driveways/path too deep to be used as an alternative to antenna radial? Metal In-ground Support Structures; Concrete-Encased Electrode (also known as "footer ground" or "Ufer ground"). That's why 20' is specified. The Ufer ground . The tension cables are essentially insulated by the plastic sheathing. The NEC is pretty specific about the Ufer ground.. if you're placing footings, it's required.After listening to Mike Holt for 8 hours talking about grounding vs. bonding, it seems bonding is more important to reduce the possibility of metal parts becoming energized (true.. Aside from a local Grounding Electrode System, an outbuilding also needs a ground wire from supply. encased electrodes, often referred to in the trade as "Ufer ground." If the connection does not extend on to other There is conflicting information about how it should be done. My house only has Ufer grounds currently for the breaker panel. by Gary Coffma » Thu, 29 Aug 2002 01:56:38 >Gary . Ufer discovered that concrete had better conductivity than most types of soil. There are two different methods for establishing this electrode. The 2011 NEC no longer allows the structural metal to serve as a grounding electrode when supplemented by a ground rod. Concrete Encased Electrode c) Many civil eng. New construction. 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