The ground rod consists of a steel core and a copper coating that is. This saline solution leaches out of the bottom of the rod. Ground rods, also known as grounding electrodes, are used to connect the grounding system of electrical systems to earth ground. Otherwise you need 2, however they can both be off the main panel. Connections to the rods can be by mechanical clamps, compression or by furses own furseweld exothermic welding system. How can i install a grounding rod with bedrock four feet down. I used 3 rods of about 8 feet long each spaced out about 8 feet apart. Ground rods must be made of copperclad steel with a nominal diameter of 58 inches. I am an electrical contractor in nj, and the inspector wants me to drive two ground rods on a residential 200 amp service. Technical specification for earth rods accessories, connectors and earth enhancing compound page 4 of 21 specification ets010801 ver 2 ergon energy corporation limited abn 50 087 646 062 5. Or you could use grounding plates that are buried 2x2 plates of copper. Discussion in electrical codes started by ice, jul 7, 20. Oct, 2011 2 separate ones will provide a better grounding solution than 2 connected in series.
You only need 1 ground rod if it passes the magic 25ohm test. Galvan is your best choice for quality copper coated ground rods, galvanized. Driven into the ground in the construction process for tower, substation, pole, and necessary grounding of all major projects. I t is practically impossible to drive a ground rod in some mountainous areas of the western united states and in certain other parts of the world without rock drilling equipment or dynamite. Complete earth ground rod kit for electric fence charger. In some areas it is not just a matter of breaking or pushing a few rocks to the side as a ground rod.
Since we have no practical method of measuring the resistance to ground an ohmmeter will not work additional ground rod or rods would be a good practice. Galvan electrical ullisted ground rods, clamps and connectors. Active system dynasphere lightning terminals concept developed. Article 250 grounding and bonding mike holt enterprises. By putting the end of the ground rod in the hole, it will be easier to start hammering. Ground rod sections must be a minimum of eight feet in length and. Ground rods can be made with many different materials, but copper is the most common materials used for residential installations. Long term id go with the galvanized, but rebar does work just fine. This results in a straighter, harder steel core, making installation easier. Stainless steel rods are also available for more detailed information, contact your abb regional sales office.
In the united states we have two separate grounding systems. The dirt on ground rods electrical contractor magazine. Pointed copperbonded ground rods manufactured of high strength 1018 cold drawn steel the erico preferred ground rod compression couplers for pointed rods for use when coupling pointed rods sectional copperbonded ground rods for use when it is necessary to deepdrive rods coldrolled threads stronger than cut threads. The nec says that if the ground rod does not have a resistance of 25 ohms or less to earth then a second ground rod is required. Part number, ground rod diameter, nominal, ground rod diameter, actualo, lengthl, plating thickness, unit weight, upc label, complies with. When mixed with water it will absorb up to x its dry volume and it becomes a thick paste. What are the grounding specifications on a hunter dual system. Eritech copperbonded ground rods in a grounding system, the ground electrode provides the physical connection to the earth and is the instrument used to dissipate current into it.
Simply put, an enhanced ground rod is a conductive hollow tube ground rod, usually manufactured from copper. The wire just disappears into the ground, right beside a. Ground rods all values are nominal and subject to correction application. Galvanized ground rods are coated with zinc to a thickness of 3. We use a unique manufacturing process, which includes drawing the steel rod to size before the copper bonding process begins.
From our industry leading copperbonded ground rods to solid copper rods, stainless steel rods, or galvanized rods, nvent erico has the ground rod solution that you can depend on. We have the equipment grounding system and the grounding electrode system. Ground rods are very good conductors of electricity and allow any dangerous. Each surge arrestor protects a 300 foot radius of the twowire path.
Shop our inventory of grounding rods and clamps online. These are grounding rods with carbide tips to be driven in with a hammer drill, just like drilling for oilo. Oh and personally i have a ground rod at each corner of the house all tied into the electrical supply. For ground rods installed vertically, you need to drive them at least eight feet into the ground. There must be a surge arrestor at the end of the twowire that is the maximum distance from the.
All rodtype grounding electrodes or ground rods are manufactured from a steel core with a nonferrous coating to guard the steel. Bentonite has all the qualities of the ideal back fill for ground rods. The more ground rods, the more voltage the animal will get. Ground rods, chemical kits, gem enhancement material. Grounding triad jan 14th, 2010 comment dear charlie. In lightning prone regions, consider grounding every 300 rather than going out to the maximum distance. Then the tests were repeated with ground rods mechanically connected in series and driven to different depths in the earth. If the first ground rod has a ground resistance of 100 ohms, you only need to add one additional ground rod, regardless of the resistance of the two ground rods. Ground rods shall be lo cated as close as possible to the equipment to be protected. These ground rods are installed specifically to improve the performance of the grounding system. Proper way to attach copper wire to a ground rod ehow. You still need to keep the ground rods at least 6 feet apart minimum at the closest point between the two rods i would recommend digging a long trench, about 25 feet long, lay one 8 foot rod in near one end, leave 8 feet between the rods 6 feet is minimum, then lay. Coldrolled threads with continuous, unbroken grain flows preserve copper coating and are stronger than cut threads.
Galvan electricals print and pdf catalog features latest product info plus nec. Erico is the worlds largest manufacturer of ground rods and offers a complete line of rods and accessories to meet the needs of every user. To get the top down to a more manageable level, dig a hole 24 feet 0. Gallagher complete 3 ground rod kit, contains three 5 6 long galvanized rods, heavyduty clamps and 50 of 12 gauge galvanized wire.
They contain special hygroscopic, electrolytic salts. The main difference between the two rods is the thickness and type of material used to cover the steel core. Natural electrodes are intrinsic to the facility and include metal underground water pipe. You still need to keep the ground rods at least 6 feet apart minimum at the closest point between the two rods i would recommend digging a long trench, about 25 feet long, lay one 8 foot rod in near one end, leave 8 feet between the rods 6 feet is minimum, then lay in the other rod near the other end. The nec doesnt specify what is to be used to drive ground rods and using a power tool as you suggest is a common method. By the way, the reason we require wired ground and ground rods for outbuildings is that 25 ohms isnt nearly good enough. It is easy to prepare, non corrosive, and highly conductive. I used this to drive in some 12 ground rods for a electric fence install. Technical specifications for earth rodsaccessories.
Once the second ground rod is installed, its not necessary for the two to meet the resistance requirement. Balic produces ground rods, conductors, grounding connections and other earth material, and have more then thousand sizes. Some references say approximately twice the buried length of the rods to avoid overlapping of the sphere of influence for each rod. Ground rods chemical ground rod kits kit includes the chemical electrode filled with electrolytic salts, bentonite, 50 lbs of contactgm backfill and an inspection well. Page 1 of 6 eritech copperbonded ground rods 3252010. Provides an efficient earth in poor soil conditions where spacing for electrodes is. Features copperbonded ground rods l resist corrosion better than galvanized rods allowing for a 30year service life in most soils.
To protect the industry against poorquality steel, galvan and other nema members developed the ansiapproved nema gr1 in 2001 groundrod specification, which established minimum acceptable performance criteria. The equipment grounding system is designed to protect us against electricity that comes from the utility transf. Protective grounding standard introduced in revision g with the introduction of revision g of the ansitia 222 standard for antenna supporting structures and antennas, effective january 1, 2006, the standard for protective grounding has increased the minimum number of ground rods required and has set a maximum number of ohms of total ground resistance. Ours has been in for a year and havent had any issues at all. Grounding requirements for main panel and subpanel home. Erico acquires knight metalcraft, a manufacturer of copperbonded ground rods, and carolina galvanizing, a manufacturer of galvanized and copperbonded ground rods which later combine to form eritech. Our goods meet the certifications of iso, ul, sgs etc. Analysis of the recorded data and the field radio transmission tests indicated that the use of four seriesconnected ground rods, driven only a foot or two into the earth, provided the most efficient ground system. Copper ground rods should have a minimum diameter of 581. Ground rods protect against high voltage from nearby lightning strikes and also improve the performance of all electrical appliances. Start digging a hole with a shovel or posthole digger. In regards to the triad ground rod arrangement and any other ground rod installation where two or more rods are installed, the distance between the rods should be twice the depth of the rod if the same size length rods are used, based on the ieee standard 142, recommended practice for grounding of industrial.
Because a ground rod is so long, it can be hard to get leverage on the top of it when you start installing it. As a practical matter, few electricians do the resistance measurement. The ground rod is the most widely used grounding electrode. The wire just disappears into the ground, right beside a fence post. A useful rule is that grounding systems of 224 rods placed one rod length apart in a line, hollow triangle, circle, or square will provide a grounding resistance divided by the number of rods and multiplied by the factor f taken from table2. This consistency will stick to anything that it contacts, and. Ground rods are intended to be driven into earth to provide grounding for substations, towers, homes, buildings and all other structures that contain electrical products or for applications to provide grounding against lightning. Copperbonded ground rods are coated with copper to a thickness of 10 mils or. Erico is the worlds largest manufacturer of ground rods and offers a complete line of ground rods and accessories to accommodate various types of customer requests. Jul 14, 2019 start digging a hole with a shovel or posthole digger. Erico is the worlds largest manufacturer of ground rods and offers a.
Its an expensive bit for sure but it allowed me to easily drive the ground rods in record time, saving me hours of pounding on them with a sledgehammer and also helping to avoid the end of the rod mushrooming out and possibly damaging the galvanized coating. Apr 05, 2010 the nec says that if the ground rod does not have a resistance of 25 ohms or less to earth then a second ground rod is required. From our industry leading copperbonded ground rods to solid copper rods, stainless steel rods, or galvanized rods, nvent erico has the ground rod solution that you can. The ground rod is the most commonly used type of electrode. Eritech copperbonded ground rods eritech copperbonded ground rods in a grounding system, the ground electrode provides the physical connection to the earth and is the instrument used to dissipate current into it. Ground rods, conductors, connections, earth materialbalic. Shop for ground rods copper in ground rods from rexel usa where contractors and project managers can find the electrical ground rods copper products they need for their projects. Kits include 2 x 1200 mm rods, coupling dowel, driving stud and spike to make 8 ft rod. Where more than one ground rod is used, each rod shall not be less than 6 feet from any ot her rod. Electric fence energizers or fence chargers need the ground rod system to give livestock shocks. Chemical ground rod with factory attached 4 pigtail 2 solid tinned wire facing up. There are to be driven into the ground at a location 8 to 10 feet2.
The e electrode demonstrated the most stable resistance values of all the electrodes tested in the five test sites from phase 1 of the program. These salts form a saline solution by absorbing moisture out of the atmosphere. However, a ground wire and rod system is only as good as the method used to connect the wire to the ground rod. Gallagher complete 3ground rod kit, contains three 5 6 long galvanized rods, heavyduty clamps and 50 of 12 gauge galvanized wire. The second rod should be driven a minimum of six feet away. A single ground rod that has a resistance to ground of 25 ohms or less must be augmented by a second ground rod. Section 620 grounding and lightning protection fdot. Step 2 install the ground rod horizontally if you hit a rock trench before you can hammer the rod down all eight feet, then you can simply install it horizontally. Place a surge arrestor every 600 on the twowire path.
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