I decided that lightning may be a problem. 8124. A bunch of short radials is better than a few long ones for an RF counterpoise but you can use very large size conductors, possibly 6ga for three or four of the ground radials and drive in 10ft ground rods every 20ft or so along the length of those ground radials to help dissipate a . Location: Central New York State. Grounding rods of copper-clad steel, copper, or stainless steel driven 10 feet into the ground; Heavy aluminum or woven copper cable connecting the air terminals to the grounding terminals; Lightning discharge units and arresters for antennas, telephone lines, and electric lines; Lightning protection for trees within 10 feet of your property Lightning ground. Standard for the Installation of Lightning Protection Systems NFPA 780 provides lightning protection system installation requirements to safeguard people and property from fire risk and related hazards associated with lightning exposure. Failure to observe any part of this grounding requirement may result in hazardous potential being developed between the telephone (data) equipment and other grounded items that personnel may be near or might simultaneously contact." 6. This recommendation is in addition to any made grounding electrodes, such as the lightning ground ring. They do not decrease the likelihood your home may be struck, but provide a direct path to ground, preventing damage to your home from fire, explosion, and electrical . Where the ground may be dry, especially sandy, or where lightning may be particularly severe, more rods should be installed, at least 10 feet apart. Just getting the information out there is all. Rod and pipe electrodes shall not be less than 2.44 m (8 ft.) in length and . Step 1. B. We are happy to assist you! Connect or "bond" all ground rods together via bare copper wire (#6 or larger, see the NEC) and bury the wire. Conductor from ground connections to the ground terminations shall be Class II copper lightning conductor. Where the ground rod is located far from the main electrical panel, thicker No. Not sold in odd footage i.e. #2. It will be very close to your electrical panel - either under it in the floor of the basement, or outside of the house where the electrical cable comes in from the utility. I can't drive the rod into the ground. If a lightning protection system is installed on a building/structure, it must be bonded to the building/structure grounding electrode system as per 250.106. The standard states that alternate or special grounding systems or special grounding requirements should be included in the owner's procurement specifications. Individual rod installations (no ground ring) must be tested so that each electrode is at the same resistance to ground. 1.Extend air terminals 300 mm (1 foot) above the top of the light fixtures and securely clamp to the light fixture supports. As the electrical current begins to flow through the lightning rod, it must be conducted away from the structure on which the rod is installed, usually through a cable terminating in a metal rod sunk into the ground to safely dissipate the electrical charge. 4. . Other (non-lightning) systems requiring grounding shall be integrated (bonded or connected) to the lightning ground to form a common ground potential (see section 4.14). Location. The metal mast on the roof is a lightning rod. If your house is larger in perimeter than 250 feet but less than 350, you need three groundings. Contact a local electrical contractor to make sure it is done right. That said, losses due to lightning strikes and damage, whether direct or indirect, can run into the billions of dollars each year. This keeps both systems at an equal potential. Inspection and Certification: Upon completion of the installation, the contractor shall furnish the Master Label issued by Underwriters Laboratories, Inc. for this system. For signals, the bonding of all ground rod electrodesto the 3. Canada - CSA C22.2 No. Lightning rods are also called finials, air terminals, or strike termination devices. What is bonding? The intent of the proposal is to include requirements that specify when to bond multiple roof top Ground rods must be made of copper-clad steel with a nominal diameter of 5/8 inches. Current dissipation is what happens when the lightning rods does its duty. connected to the grounding stud provided in the metal base by utilizing an active clamping grounding lug with mounting tang as shown in Figure 14-6. 620-2.1 Ground Rods: Use ground rods meeting the requirements of UL 467 that are listed by an OSHA Nationally Recognized Testing Laboratory (NRTL). A braided copper or aluminum cable made for lightning systems connects the rods and runs into the ground to dissipate a charge. Current Edition: 2023 View Document Scope Submit a Public Input for the Next Edition BUY NFPA 780 You can use this ground rod, as long as it is relatively close to the antenna mast you are installing. No other ground shall be used as a lightning ground (see section 4.13.1.3). Facebook. If the ground rod cannot be driven to 30", a 45-degree angle or horizontal installation at a depth of the ground wire is also acceptable. It also says that the ground wire be #1AWG. Solid copper ground rods. 2.Install 600 volt class lightning arresters. How to Install a Grounding Electrode System, Step #1, Begin by purchasing two copper-coated steel ground rods 5/8 diameter by 8 long. Voice your opinion! If lightning hits the structure, it will preferentially strike the rod and be conducted to ground through a wire, instead of passing through the structure, where it could start a fire or cause electrocution. On structures less than 30 metres (about 100 feet) in height, a lightning rod provides a cone of protection whose ground radius approximately equals its height above the ground. The Standard is divided into Three Levels of Protection. Grounding & Bonding Products; Lightning Protection Products; Exothermic Products; Markets; Harger University; Grounding & Bonding Products; Lightning Protection Products; Exothermic Products; . What resulted in quite interesting and unexpected. Plumbing, electrics all come under their purview. NFPA 70: National Electrical Code Article 250 covers the minimum requirements for grounding and bonding and, although the NEC lists requirements to abide by, it should not be taken as a design manual. By. Grounding and bonding in hazardous areas shall conform to IEC 60079. You may want to install two (2) rods, one each at opposite corners of the building. The grounding electrode for a lightning protection system must not be used as the required grounding electrode system for the buildings or structures [250.60]. Since our beginning, Thompson has sought to be the industry leader in manufacturing the highest quality conductors and components. Equipment Grounding Conductors. ANSI/TIA/EIA222-G can be obtained through www . Grounding terminals allow the current to exit into the water. The NEC requires all driven rods to be a minimum eight feet in the earth and for multiple connected rods a minimum spacing of six feet between rods. These periodic inspections of the lightning rod allow the detection of deviations from the reference standards or anomalies in the installation caused by environmental conditions such as corrosion, incorrect handling such as sectioning . Then you must use a Bimetal connector and transition to at least 5 feet of copper cable per ground location. Scope 1.1 The requirements of this standard cover the design of systems using Early Streamer Emission ("ESE") air terminals for strikes. In areas where codes require two ground rods because of high electrical resistance in the . The first rod in each radial must be at least eight feet from the equipment. In the initial stages of development, air acts as an insulator between the positive and negative charges in the cloud and between the cloud and the ground; however, when the differences in charges becomes too great, this insulating capacity of the air breaks down and there . Lee. Both are foundational safety concepts in the NEC, and often talked about in the same breath, but they . *The National Electric Code section 250-106 requires bonding between a lightning protection system and the building grounding electrode system. 1. It also requires all electrically active equipment and appurtenances supported by a structure to be connected to a secondary ground. Continue to 5 of 5 below. 137 feet. We provide proven grounding and bonding equipment certification solutions for the U.S. market as well as Canada and Mexico. 2. A lightning rod is NOT used to provide a path for a lightning strike to get to the ground. This paper describes the risks associated with FRP storage tanks to direct lightning strikes and provide guidance to protect facilities from direct lightning strikes and/or secondary lightning transients. Note that lightning protection systems do not prevent lightning from striking the structure, but rather intercept a lightning strike, provide a conductive path for the harmful electrical discharge to follow (the appropriate UL-listed copper or aluminum cable), and disperse the energy safely into the ground (grounding network). Each quantity is an increment of 5 feet, i.e. Some terms and requirements discussed may be true for the European standards, however, the intent of this article is to clarify grounding and bonding design seen in the United States. Determine where your groundings will be. A wavelength base-fed vertical needs only a very modest ground, and a ground rod is adequate. Ground rings are required for all non-conductive buildings, buildings housing electronic systems, and certain risk factors. If the perimeter is between 350 and 450 feet, you need four, and so on. On taller structures, the area of protection extends only about 30 metres from the base of the structure. Tanks with metal roofs and metal sides made of metal 4.76 mm thick or greater according to IEC 62305 and IEC 60079 shall be considered self protected from lightning. Level 3 Air Terminal Installation Requirements 35 17. The whole point of bonding is to give a low impedence path back to the source. Use only approved clamps to connect wire to rods. If the roof has lightning protection it is required to be bonded at some point. It needs to be properly grounded. Concrete encased electrode/footing rebar c. Grounding rod/ring 2. 6. Grounding is the act of connecting the electrical system or equipment to the earth or a conductive object that extends the connection to the earth. Use clamps and #6 AWG bare copper wire to secure the rods together. The purpose of this procedure is to define the step by step method to implement the correct practices for the precommissioning, testing & commissioning of Lightning Protection System through the guidelines contained herein so as to ensure that the job execution complies with the project requirements and serves the intended function to satisfactory level.
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