Before installing a pv system, it must be decided whether the installation will be on a building with or without lightning protection. Designing to lightning standard, nfpa7802011 pdh online. For public buildings such as halls or churches, schools or hospitals, some countries building regulations. A direct strike to a building or structure will seek a path to ground either via the structures. Lightning protection in schools policy and guidance. This opening part of the bs eniec 62305 suite of standards serves as an. The bs eniec 62305 standard for lightning protection. Lightning protection standards indicate that, besides the roof, for buildings higher than 60 meters the 20% upper part should be protected with an air termination system.
Jul 21, 2017 lightning is a powerful, destructive force of nature and will strike a building regardless of its type of roofing. A discharge of static electricity between clouds and. Lightning protection systems complying with cancsab72m87, installation code for lightning protection systems and standards from the national fire protection association nfpa, ul, and the lightning protection institute lpi are highly effective. Lightning protection for buildings with metal roofs 201707. Lightning protection is an affordable amenity that offers protection against a leading cause of property damage. These are five basic elements in a lightning protection system for a residential or light commercial buildings. These create a channel of plasma air for the huge downward currents of a lightning strike.
Jul 12, 2007 so, this brief overview of the new bs en 62305 lightning protection standard clearly demonstrates how it is more complex and exacting than its predecessor. Ul 96 and ul 467 are product standards for lightning protection components. The empire state building is struck by lightning about 100 times every year. A lightning protection system provides a conductive path between an air terminal and earth, so that when a building is struck by lightning, the majority of the lightnings current follows the. While pricing generally runs less than 1% of the value of the structure, costs for protection.
Requirements for lightning protection systems, or nfpa 780, standard for the. The only way to protect a building is with a properly designed and installed lightning protection system lps. During its formation lightning moves in any direction, but only until it finds a way to ground. As far as lightning rods and lightning arrestors go, ibc is completely silent on this matter. Lightning strikes to buildings and grounds often results in fire, damages to buildings, cultural heritages and economic losses.
Communication site building design and installation 31. A congressional letter, dated june 30, 2004, to the comptroller general expressed concern that the federal government may not have a uniform approach to protecting its facilities from. Calculate no of down conductor for lightning protection. Commission iec has published numerous standards on the topics of lightning protection for buildings, protection of elec tronic systems, risk analysis and. For example, a lightning strike up to 1km from a building can transfer huge voltages onto overhead or underground cables like data or telephone lines through inductive or resistive. With building lightning protection, rhino steel buildings go together quickly and easily, like a big erector set. It would be nice if bears had good table manners and waited politely to be. Introduction this paper is concerned with a number of topics related to the lightning protection of structures and personal safety, as outlined next. Nfpa 780 and ul 96a are application standards governing satisfactory installation of an lps.
Building is 15 years old, not in a particularly vulnerable area of south yorkshire, and in. Mcniff light industry mli worked with lightning protection consultants, wind turbine. How steel buildings resist lightning lightning protection. While pricing generally runs less than 1% of the value of the structure, costs for protection vary depending on the size of the structure, location, construction, roof type and grounding conditions. Following is a description of pertinent standards for lightning protection and a summary of useful. For three decades, the lightning protection guide from dehn has been the trademark for practiceoriented technical literature in the fields of lightning and surge protection for buildings, installations and systems. Design consideration of electrical distribution and lightning protection systems for highrise building 111 busbar trunking systems are designed to withstand the effects of shortcircuit currents resulting. The management of the process for determining the need and delivering an lps to a structure andor an lpms to protect electrical or electronic systems within a structure.
Empirical lightning protection classification of buildings. Figure 36 lightning protection fur tents 68 figure 37 lightning protection low cost installation for isolated farm buildings of brick and tile construction 69 figure 38 lightning protection system for sports stadium football ground 70 figure 39 jypical arrangement for protection of windmills 73 figure 40 bridges 74. Thus, a protection system leaves the structure, its contents, and its occupants unharmed. A lightning rod is a pole attached to the roof of a building. Ul 96 lightning protection systems standards for components 4. Design consideration of electrical distribution and lightning protection systems for highrise building 111 busbar trunking systems are designed to withstand the effects of shortcircuit currents resulting from a fault at any load point in the system, e. There are several independent organizations that have issued standards on the installation and design of lightning protection systems.
It is the british edition of the european standard to which all lightning protection systems to new structures, and new extensions to existing ones, are now designed, installed and maintained. Type of constructions b steel framed encased without metal roof as per table multiplying factor 0. This illustration identifies the components and introduces the basic rules for an. Lightning is a powerful, destructive force of nature and will strike a building regardless of its type of roofing. So, this brief overview of the new bs en 62305 lightning protection standard clearly demonstrates how it is more complex and exacting than its predecessor. Servicing or maintaining security or fire alarm systems. Lightning protection and the building envelope construction.
Search results for categorybuilding lightning protection. For public buildings such as halls or churches, schools or hospitals, some countries building regulations request lightning protection systems for safety reasons. In the united kingdom, zurich are prepared to consider all proposals for lightning protection systems which comply with both bs en 62305 for systems and the associated bs en. Apr 10, 20 with building lightning protection, rhino steel buildings go together quickly and easily, like a big erector set. May 02, 2017 the shocking truth about metal buildings in thunderstorms. Developments in lightning protection 9 references 9 further reading 10 9. The height of a structure, not the framing material, determines the probability of a direct lightning strike. Lightning protection for high buildings aplicaciones.
A complete lightning protection system shall be provided for the entire building and garage. Nec article 280 and 285 arent much help either, but then, nec is a. Bs en 62305 bs en 62305 is the latest reference document for protection against lightning. Bud vansickle, executive director of the lightning protection institute in maryville, missouri, says you either have a full lightning protection system or none at all. Lightning protection can be implemented with minimal impact to the buildings appearance. Lightning protection systems on trial building design. The goal of this course is to learn how to design lightning protection systems. Nevertheless, when the subject is lightning protection systems, some of the most recent drama has. Months of anticipation and speculation has come to an end as the 18 th edition of the iet wiring regulations has now been published bs7671. A direct strike to a building or structure will seek a path to ground either via the structures lightning protection system or via any other metallic path via a series of flashovers which may be quite unpredictable. Although protection of the main incomer is certainly recommended, other services should be considered for protection against transient overvoltages surges. Torriente, marquis of valdecilla, with the close collaboration of his niece dona maria. However, the key principles are well established and pretty familiar to all. Building is 15 years old, not in a particularly vulnerable area of south yorkshire, and in good order all round.
Figure 36 lightning protection fur tents 68 figure 37lightning protection low cost installation for isolated farm buildings of brick and tile construction 69 figure 38 lightning protection system for. High buildings are therefore preferred points for lightning strikes. Installation in the premeter area makes it possible to arrest dangerous lightning currents. Division of type 1 lightning arresters into lightning protection levels. Use current division to control the dissipation of. Standard for the installation of lightning protection systems. Lightning protection system designing buildings wiki. In addition, the concept of external lightning protection is extended to include lightning protection on the sidewall of highrise pc buildings.
Contrary to urban myth, steel buildings resist lightning, not attract it. Lightning protection systems traditionally have been installed on tall buildings and in recent years are more commonly found on lowrise buildings as well, according to chuck ackerman, president of winsted, conn. The need for lightning protection should be established from a risk assessment and the application of the bs en 62305 protection against lightning. Calculate whether lightning protection is required or not for following building. Legal regulations defining what lightning protection is required. Air terminals also known as lightning rods or points, these are the uppermost elements. Lightning protection system designing buildings wiki share your construction industry knowledge. Physical damage to structures and life hazard software for design and calculation of lightning protection systems when designing lightning protection systems, various parameters must be taken into account. Any high point in the vicinity such as an electricity pylon or a lightning rod. May 19, 2005 a congressional letter, dated june 30, 2004, to the comptroller general expressed concern that the federal government may not have a uniform approach to protecting its facilities from lightning strikes. Rather, it provides specified pathways on which lightning can travel, carrying the destructive power of the lightning strike safely into the ground.
Key changes from the 18th edition that you need to know. The book had to be revised and enlarged due to changes in standardisation and technical progress. Does anyone know if lightning protection is fitted to a building it is mandatory to have this tested on an annual basis. Few events are as awesome as witnessing a lightning strike or seeing the damage it can produce. A lightning strike can exceed 100 million volt amps. The appropriate number of main reinforcing bars that need to be equipped with lightning connectors varies depending on the grade of each building.
Separate the antenna tower from the equipment building by a minimum of 30 feet. Protection against lightning a uk guide to the practical. There is also growing recognition that lightning protection contributes to the sustainability and resilience of buildings and communities. The height of a structure, not the framing material. All world standards relating to lightning protection cover the topic of structural lightning protection extensively. Physical damage to structures and life hazard software for design and calculation. Grounding and bonding beyond code minimums can avoid. When lightning strikes lightning rods possible worlds. You simply cannot cut corners to save cost and remain protected. Download cad, specs, 3d, bim and green product information. A lightning protection system does not attract, repel, or prevent a lightning strike. Lightning protection for buildings with metal roofs 2017. At what height does a building have to have lightning.
Code of practice for protection of structures against lightning. Unlike most products, there is no such thing as a good, better, or best lightning protection system. Professional surge protection for building installations. Basic lightning protection is covered in standard building techniques a properly bonded and grounded structure is inherently lightning resistant from a lightning rod standpoint.
Rather, it provides specified pathways on which lightning can travel, carrying the destructive power of the lightning strike. Elements of building infrastructure that can alleviate or cure. This also applies to buildings where lightning protection equipment is installed outdoors. A discharge of static electricity between clouds and earth, lightning can send 300 million volts and 30,000 amps through the atmosphereor whatever objects lie in its path. At what height does a building have to have lightning protection. Master specification lightning protection systems for early streamer emission air terminal systems faraday multipoint systems schools churches hotels apartments offices factories.
Lightning protection systems complying with cancsab72m87, installation code for lightning protection systems and standards from the national fire protection association nfpa, ul, and the. Ul 96a lightning protection systems standards for installation. Whether a lightning protection system is concealed during construction of a new building or exposed on an existing structure, the materials used are identical. Code of practice for protection of structures against. Three cameras were mounted atop the operations building to record a view of the. Installation in the premeter area makes it possible to arrest dangerous lightning currents virtually instantly as they hit the building. Jul 28, 2015 there is also growing recognition that lightning protection contributes to the sustainability and resilience of buildings and communities. Fundamentals of lightning protection systems page 1 of 14 fundamentals of lightning protection systems, edition 1c september 2011. May 18, 2016 a lightning protection system provides a conductive path between an air terminal and earth, so that when a building is struck by lightning, the majority of the lightnings current follows the path of the lightning protection system, with substantially less current traveling through flammable materials.
Calculate lightning protection for building structure. Lightning protection systems can be installed on a variety of structures including homes, businesses, farm buildings, boats, and trees to protect them from damage. The management of the process for determining the need and delivering an lps to a structure andor an lpms to protect. Use current division to control the dissipation of lightning strike energy on an antenna tower grounding system through multiple paths.
Lightning protection mastering the maze of bs en 62305. For three decades, the lightning protection guide from dehn has been the trademark for practiceoriented technical literature in the fields of lightning and surge protection for buildings, installations. The working group on lightning protection, appointed by the technical. Code of practice for the protection of buildings and. The technical committee on buildings facilities and services, appointed by the electrical and. Building lightning protection grounding metal buildings. As a result, congress requested a gao study on issues related to whether the federal government should adopt a uniform standard for lightning protection systems. The rules and regulations of the fire department shall apply as appropriate. Moreover, established suppliers of lightning protection solutions are now offering a wealth of quality support tools. Various regulations, codes, standards and guidance on lightning protection.
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