The lightning threat to mankind is well known even without considering economic losses because, in a second, there are at least 8 lightning strikes around the world. There are 4 sources of lightning, which results in 3 types of damages and bring in 4 types of losses. Damages need to be minimized so that, losses can be reduced. India has adopted this IEC as Indian Standard only inwhereas many countries have adopted it as their national standard, many years back.
The relation between Sources, Damages, and losses involves a lot of complex formulae which includes many variables. This completes validation process. Number of thunderstorm days for about cities in pan India, which is given in NBC is taken into account, as it is very difficult to get this details from the customer.
Tolerable risk levels are defined for each type of loss. Then, risk has to be calculated for the building that needs protection. Refer another article on this subject. If the calculated risk is above the tolerable level, then economical protection technique can be employed to bring the calculated risk level below the tolerable level.
This is the biggest advantage of this software, as iterations can be done to bring the cost of protection to the optimum level. What is more, if building steel is used as part of the Lightning protection system, you not only have the most economical solution, but also the most reliable system whose life is almost equal to the life of the building. For non-hazardous buildings, Risk Assessment has to be carried out to know whether the building under consideration, needs protection or not.
If protection is needed, the software can be used to find out the most economical protection technique, which may be a single solution or combination of different solutions. For example, a small building surrounded by other taller buildings on all 4 sides, may not need any lightning protection system at all. Without any protection measures, Building Calculated value is greater than the tolerable value, Hence Lightning Protection Measures Required.
To bring the above risks within the tolerable levels, one or any combination of following protection techniques need to be employed. According to Table B. Maintenance Engineers can use this software effectively without the need to know any software language because it is a simple, menu-driven software. Best Cost Vs Performance as iterations can be done to choose the most economical solutions. Nowadays, the risk due to lightning increases due to skyscraper.
Software Result for the Typical Building with the dimension of 30 x 40 x 30 Meters Without any protection measures, Building Calculated value is greater than the tolerable value, Hence Lightning Protection Measures Required. This is displayed in Green color, highlighted in Yellow.The comprehensive reference book in the fields of lightning and surge protection for buildings, installations and systems.
When designing and installing lightning protection systems, contractors will have to observe the IEC EN standard series to comply with the state of the art. To this end, they must make themselves familiar with the content of the new lightning protection standards.
European treaties require that all countries completely adopt European standards on the national level not only in the field of lightning protection.
Therefore, additional information is provided in the form of national supplements. These supplements are not contradictory to the actual standard and are only informative from a legal point of view. Since these supple- ments were prepared by different experts, many aspects from science as well as from the design, installation and inspection of lightning protection systems were taken into account.
The supplements are state of the art and must be observed. The Lightning Protection Guide is supposed to make experts in this field designers or installers familiar with the new IEC EN standard series.
For this purpose, our Lightning Protection Guide includes comprehensive practical solutions for different applications.
It also provides general information on the wide-ranging field of lightning and surge protection which is a major business area of DEHN. Get your copy on www. Plot No. E-Mail: info dehn. Choose your country. Lightning Protection Guide. DEHN Newsroom. Follow us.Active, Most Current. Prices subject to change without notice. About Us. Contact Us.
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Lightning Protection Guide
Some rush fees may apply. Add to Cart. View Full Details and Buy. Complementary Documents and Links:. This part of IEC provides the requirements for protection of a structure against physical damage by means of a lightning protection system LPSand for protection against injury to living beings due to touch and step voltages in the vicinity of an LPS see IEC This standard is applicable to: a design, installation, inspection and maintenance of an LPS for structures without limitation of their height, b establishment of measures for protection against injury to living beings due to touch and step voltages.
NOTE 1 Specific requirements for an LPS in structures dangerous to their surroundings due to the risk of explosion are under consideration. Additional information is provided in Annex D for use in the interim. NOTE 2 This part of IEC is not intended to provide protection against failures of electrical and electronic systems due to overvoltages. Specific requirements for such cases are provided in IEC Follow Us on LinkedIn.
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Open toolbar.These parts of the standard are introduced here. In these parts underwent periodic technical review, with updated parts 1, 3 and 4 released in Updated part 2 is currently under discussion and is expected to be published in late These four parts are outlined below:. It differs from BS in as much that this new part has four Classes or protection levels of LPS, as opposed to the basic two ordinary and high-risk levels in BS It classifies the sources and types of damage to be evaluated and introduces the risks or types of loss to be anticipated as a result of the lightning activity.
Furthermore, It defines the relationships between damage and loss that form the basis for the risk assessment calculations in part 2 of the standard.
Lightning current parameters are defined. These are used as the basis for the selection and implementation of the appropriate protection measures detailed in parts 3 and 4 of the standard.
Part 1 of the standard also introduces new concepts for consideration when preparing a lightning protection scheme, such as Lightning Protection Zones LPZs and separation distance. D2 Physical damage fire, explosion, mechanical destruction, chemical release due to lightning current effects including sparking.
Please see page for more details about this guide. The ideal lightning protection for a structure and its connected services would be to enclose the structure within an earthed and perfectly conducting metallic shield boxand in addition provide adequate bonding of any connected services at the entry point into the shield. This, in essence, would prevent the penetration of the lightning current and the induced electromagnetic field into the structure.
However, in practice, it is not possible or indeed cost effective to go to such lengths. This standard thus sets out a defined set of lightning current parameters where protection measures, adopted in accordance with its recommendations, will reduce any damage and consequential loss as a result of a lightning strike. This reduction in damage and consequential loss is valid provided the lightning strike parameters fall within defined limits, established as Lightning Protection Levels LPL.
Four protection levels have been determined based on parameters obtained from previously published technical papers. Each level has a fixed set of maximum and minimum lightning current parameters.
These parameters are shown in Table 6. The maximum values have been used in the design of products such as lightning protection components and Surge Protective Devices SPDs.A proper lightning protection system design is very important to ensure increased protection of a building against lightning and its effects. D uring thunderstorms too, high volume of energy is instantaneously released which is more common in nature.
The most important aspect of understanding in lightning protection is that — not only a direct lightning strike act as a potential threat to the structure but also more frequently, electronic equipment are damaged by surges caused by remote lightning discharges caused because of Lightning Electromagnetic Impulses or LEMPs or switching operations in larger electrical systems.
The same is also implemented in new National Building Code —Part -8, Section 2 which also clearly defines the need of the measures to be taken care for planning, erection, testing and maintenance of lightning protection system.
A proper lightning protection system consisting of air terminal, down conductor, earthing design is very important to ensure increased protection of a building against lightning and its effects. Systems followed in most of the buildings now are unfortunately not meeting the basic or statutory requirements.
Since only a mere vertical air terminal will not solve the purpose for protection of building unless the entire building is sufficiently protected either with:. Effective lightning protection measures Proper measures are to be taken care of while designing, procuring and installing of lighting protection components for handling a strike and dissipation of current without any dangerous spark overs.
For buildings are surrounded by trees, or a taller metallic tower the protection measures should include not only lightning protection but also required ring earthing around the building and Surge protection for the equipment since the fatality due to lighting could be more disastrous for an equipment than a structural damage.
Periodic maintenance, monitoring and certification should be made mandatory for the effective functioning of the protective devices installed. For protection of electrical, wiring, electrical and electronic equipment, installation of Surge Protection Devices should be adopted. Lightning protection is often a challenge for the building designer when it comes to aesthetics of the building.
Routing of down conductors through outer wall generally spoil the aesthetics of the building, due to which the down conductors are often routed through shafts, un-accessible areas, non-visible places etc. These down conductor increases the chance of fire and explosion in case of lightning. As a statutory requirement Lightning Protection is implemented in most of the buildings, but unfortunately in an inefficient way.
Lightning flashes to, or nearby, structures or lines connected to the structures are hazardous to people, to the structures themselves, their contents and installations need to be considered for protection measures. An effective lightning protection is achieved only if the following points are adhered viz. Design guidelines The following design guidelines need to be adhered to ensure safer installation of the external LPS.
Where : Ki -depends on the selected class of LPS Kc — depends on the lightning current flowing on the down conductors Km — depends on the electrical insulation material L — length in meters along the air-termination or down-conductor, from the point where the separation distance is to be considered, to the nearest EPB point.
Depending upon the nature of LPS system and area to be protected the number of air termination will be decided. The maximum distance of any point on the roof from the nearest horizontal protective conductor shall be decided as per nature of LPS system and the level of protection. Horizontal conductors in form of a mesh conductor. Conclusion The most neglected part in many structures or buildings are protection against lightning.
Since the post impact of lightning is too severe and disastrous care should be given at every level to ensure lightning protection is not provided for seeking statutory approvals.
The installation should not be a vendor driven and only based on regulations as insisted by national or international standards and code. All maintenance procedures shall be scheduled and carried out meeting the standard requirements in periodic intervals. Last but not the least, human safety from lightning will only be possible by creating awareness, use of warning signage boards in required location and not by any protective devices.
About the author: Dr.Lightning is a natural phenomenon involving a very high quantum of electrical energy. Lightning cannot be prevented and predicted. Hence it is imperative that one is adequately prepared at all times to protect against these dangerous natural phenomena. You can determine whether the structure is safe against lightning strikes within tolerable limits.
If protection is required i. This is done by determining the extent of risk to the structure and comparing with the tolerable values. Maintenance Engineers can use this software effectively without the need to know any software language because it is a simple, menu-driven software. External Lightning Protection System is designed to protect a structure from damage due to lightning strikes by intercepting such strikes and safely passing their extreme high currents to ground.
Since it is not possible to predict the lightning strikes, it is advisable to take adequate protection against lightning strikes. Protection techniques that can be implement includes either standalone techniques or combination of different techniques:. Lightning Protection Home. Lightning Protection. Effective and reliable protection is the only solution.
Technical Services for Adequacy Study for existing structures. Best Cost Vs Performance as iterations can be done to choose the most economical solutions.