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NMX-J-549-ANCE-2005: The Best Practices for Protecting Your Structures from Lightning Strikes


What is NMX-J-549-ANCE-2005?




NMX-J-549-ANCE-2005 is a Mexican norm that specifies the requirements for designing, installing, and maintaining lightning protection systems for buildings and structures. It was issued by the Association of Standardization and Certification (ANCE) in 2006, based on international standards and best practices. The norm aims to provide a comprehensive and reliable guide for protecting people, property, and equipment from the effects of lightning strikes.


How to download NMX-J-549-ANCE-2005?




If you want to download NMX-J-549-ANCE-2005, you have two official options:




nmx-j-549-ance-2005 download



  • You can purchase it from the ANCE website (), where you can find the full text of the norm in PDF format. You will need to register an account, select the norm from the catalog, and pay a fee of $1,500 MXN (about $75 USD).



  • You can consult it for free at the library of the General Directorate of Standards (DGN) of the Ministry of Economy (), located in Naucalpan, Estado de México. You will need to make an appointment, present an official ID, and follow the rules of access and use.



Alternatively, you can find some unofficial sources that offer a preview or a summary of the norm online (), but they may not be complete or updated.


What are the main contents of NMX-J-549-ANCE-2005?




NMX-J-549-ANCE-2005 covers three main aspects of lightning protection systems: general specifications, definitions, and requirements.


General specifications




The general specifications define the scope, objective, and references of the norm. They state that:


  • The norm applies to any building or structure that needs a lightning protection system, regardless of its size, shape, location, or function.



  • The objective of the norm is to establish the criteria for designing, installing, and maintaining a lightning protection system that minimizes the risk of injury or damage caused by lightning.



  • The norm is based on several national and international standards, such as NOM 001 SEDE 2012 (Electrical Installations), IEC 62305 (Protection against Lightning), NFPA 780 (Standard for Lightning Protection Systems), among others.



Definitions




The definitions explain the key terms and concepts related to lightning protection. Some examples are:


Requirements




The requirements specify the design, installation, and maintenance criteria for external and internal protection systems.


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External protection system




The external protection system consists of the elements that intercept, conduct, and dissipate the lightning current to the ground. It includes the following components:


  • Air terminals: metal rods or wires that are installed on the highest points of the structure to capture the lightning strike.



  • Down conductors: metal cables or bars that connect the air terminals to the ground electrodes.



  • Ground electrodes: metal rods or plates that are buried in the soil to discharge the lightning current to the earth.



The norm provides the methods for determining the risk assessment, protection levels, and dimensions of the external protection system, based on factors such as the location, height, area, and use of the structure, as well as the soil resistivity and lightning density.


Internal protection system




The internal protection system consists of the measures that prevent or reduce the effects of lightning inside the structure. It includes the following elements:


  • Equipotential bonding: a network of conductors that connects all metal parts and electrical systems in the structure to avoid potential differences and sparks.



  • Surge protection devices: devices that protect electrical and electronic equipment from overvoltages and overcurrents caused by lightning surges.



  • Shielding: a layer of conductive material that covers or surrounds sensitive areas or equipment to reduce electromagnetic interference and induction.



The norm provides the guidelines for selecting, installing, and testing the internal protection system, based on factors such as the type, location, and sensitivity of the equipment, as well as the characteristics of the electrical network.


What are the benefits of complying with NMX-J-549-ANCE-2005?




Complying with NMX-J-549-ANCE-2005 has several benefits for building owners, occupants, and managers. Some of them are:


  • It reduces the probability of injuries or fatalities due to direct or indirect lightning strikes.



  • It prevents or minimizes damage to structures, facilities, and equipment due to fire, explosion, or electrical faults.



  • It avoids or lowers costs associated with repairs, replacements, insurance claims, or legal actions.



  • It improves the safety, reliability, and performance of electrical and electronic systems.



  • It enhances the reputation and image of the organization or business.



What are the challenges of implementing NMX-J-549-ANCE-2005?




Implementing NMX-J-549-ANCE-2005 is not without challenges. Some of them are:


  • It requires a thorough analysis and evaluation of the structure and its surroundings to determine the appropriate level and type of protection.



  • It involves a significant investment in materials, labor, and equipment to install and maintain a complete and effective protection system.



  • It demands a coordination and collaboration among different stakeholders, such as architects, engineers, contractors, electricians, inspectors, and authorities.



  • It faces some technical difficulties and limitations due to factors such as complex geometries, aesthetic considerations, environmental conditions, or regulatory constraints.



How to verify the compliance with NMX-J-549-ANCE-2005?




To verify the compliance with NMX-J-549-ANCE-2005, it is necessary to measure and test the performance of the protection system. The norm specifies the methods and instruments for conducting these measurements and tests. They include:


  • Soil resistivity measurement: a method that determines the electrical resistance of the soil using a four-point probe or a clamp-on meter.



  • Ground resistance measurement: a method that measures the resistance of the ground electrode system using a fall-of-potential method or a clamp-on meter.



  • Bonding resistance measurement: a method that measures the resistance of the equipotential bonding network using an ohmmeter or a clamp-on meter.



  • Surge protection device test: a test that verifies the functionality and integrity of the surge protection devices using a surge generator or an insulation tester.



How to update NMX-J-549-ANCE-2005?




NMX-J-549-ANCE-2005 is subject to periodic revision and improvement by ANCE. The norm states that it should be reviewed at least every five years or whenever there is a significant change in technology, science, or regulation. The revision process involves:


  • A proposal for revision by any interested party, such as users, manufacturers, researchers, or authorities.



  • A review and approval by a technical committee composed of experts and representatives from different sectors.



  • A publication and dissemination of the revised norm by ANCE and DGN.



The latest revision of NMX-J-549-ANCE-2005 was published in 2018, with some minor changes and clarifications.


Conclusion




NMX-J-549-ANCE-2005 is a valuable norm that provides a comprehensive and reliable guide for designing, installing, and maintaining lightning protection systems for buildings and structures. It is based on international standards and best practices, and it covers all the aspects of external and internal protection. Complying with NMX-J-549-ANCE-2005 can bring many benefits, such as reducing the risk of injury or damage, improving the safety and performance of electrical and electronic systems, and enhancing the reputation and image of the organization or business. However, implementing NMX-J-549-ANCE-2005 also involves some challenges, such as conducting a thorough analysis and evaluation, investing in materials and labor, coordinating and collaborating with different stakeholders, and overcoming some technical difficulties and limitations. To verify the compliance with NMX-J-549-ANCE-2005, it is necessary to measure and test the performance of the protection system using the methods and instruments specified by the norm. To update NMX-J-549-ANCE-2005, it is necessary to follow a revision process that involves a proposal, a review, an approval, and a publication by ANCE and DGN. The norm should be reviewed at least every five years or whenever there is a significant change in technology, science, or regulation.


If you want to learn more about NMX-J-549-ANCE-2005 or download it, you can visit the official sources mentioned in this article. You can also contact us if you have any questions or need any assistance with your lightning protection project. We are experts in lightning protection and we can help you comply with NMX-J-549-ANCE-2005.


FAQs




Here are some common questions and answers about NMX-J-549-ANCE-2005:


  • Q: What is the difference between NMX-J-549-ANCE-2005 and NOM 001 SEDE 2012?



  • A: NOM 001 SEDE 2012 is a mandatory norm that regulates the electrical installations in Mexico. It includes some general provisions for lightning protection systems, such as grounding, bonding, and surge protection devices. NMX-J-549-ANCE-2005 is a voluntary norm that specifies the requirements for lightning protection systems in more detail, such as risk assessment, protection levels, design criteria, installation methods, maintenance procedures, and performance measurements.



  • Q: How can I know if I need a lightning protection system for my building or structure?



  • A: You can use the risk assessment method described in NMX-J-549-ANCE-2005 to determine if you need a lightning protection system for your building or structure. The method considers factors such as the location, height, area, and use of the structure, as well as the soil resistivity and lightning density. The method calculates a risk index that indicates the probability of being struck by lightning per year. If the risk index exceeds a certain threshold value, then you need a lightning protection system.



  • Q: How can I choose the best lightning protection system for my building or structure?



  • A: You can use the protection level method described in NMX-J-549-ANCE-2005 to choose the best lightning protection system for your building or structure. The method considers factors such as the type of structure, the occupancy level, the contents value, and the service continuity. The method assigns a protection level from I to IV, where I is the highest and IV is the lowest. The protection level determines the dimensions and characteristics of the external and internal protection system components.



  • Q: How can I install and maintain my lightning protection system according to NMX-J-549-ANCE-2005?



  • A: You can follow the installation and maintenance criteria described in NMX-J-549-ANCE-2005 to install and maintain your lightning protection system according to the norm. The criteria include specifications for materials, connections, clearances, routing, labeling, documentation, inspection, testing, and repair of the protection system components. The norm also recommends that the installation and maintenance should be done by qualified and certified personnel.



  • Q: How can I get a certification for my lightning protection system according to NMX-J-549-ANCE-2005?



  • A: You can get a certification for your lightning protection system according to NMX-J-549-ANCE-2005 by applying to an accredited certification body. The certification body will evaluate your protection system according to the norm and issue a certificate of compliance if it meets the requirements. The certificate will have a validity period of five years, after which it should be renewed. The certification body will also conduct periodic audits to verify the proper functioning and maintenance of the protection system.





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