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FAQs
Lightning Protection Manufacturer, Focus on High Quality Lightning Rods and Grounding Solutions
FAQs
  • Q.How it is calculated ΔT of an ESE lightning rod?
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  • A.The ΔT is the early streamer emission of an ESE lightning arrester, which is obtained by a test in a high voltage laboratory. The test conditions are described in Annex C of the NF C 17-102: 2011, UNE 21186: 2011 and NP4426: 2013 standards.
  • Q.What is the maximum ΔT for a lightning rod ?
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  • A.According with NFC 17-102: 2011, UNE 21186: 2011 and NP4426: 2013 standards, in its point 5.2.2 and C.2.2 indicates that a lightning rod to be considered an ESE lightning rod, must obtain a ΔT at least of 10 microseconds, and the maximum permissible value of (ΔT) is 60μs, although in the test have obtained superior results.
  • Q.Which is the minimum height that it has be placed an ESE lightning rod?
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  • A.The tip of an ESE lightning rod should be located at least 2m above the protected area, including antennas, cooling towers, roofing, reservoirs, etc.
  • Q.What it is the maximum protection radius for an ESE lightning rod?
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  • A.As the maximum permissible value for ΔT following the standards is 60μs, the maximum protection radius calculated may not exceed of 113m in Level IV protection.
  • Q.How to calculate whether a structure requires a lightning protection system?
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  • A.Using the risk calculation indicated in the Annex A of the NFC 17-102: 2011, UNE 21186: 2011 and NP 4426: 2013. In our website there is an INGESCO Software Design, which is an online program that it allows to calculate the risk assessment and also make a totally free report with GOOGLE MAPS.
  • Q.What are the protection levels?
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  • A.The protection levels of an ESE lightning rod are the safety factors to be applied to minimize the risk of damages due lightning strikes on a structure. Protection levels for lightning protection have a range from Level I to Level IV. Being the Level I the strictest level and the level that provides a greater efficiency.
  • Q.What standards govern ESE lightning rods
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  • A.Each country has its own regulations on ESE lightning rods, the most applicable standards being the French NFC 17102: 2011, the Spanish UNE 21186: 2011 and the Portuguese NP4426: 2013. In the same way, there are regulations, standards or specific laws of each country, which coexist with international standards and can be completed or specified as is the case in Spain of the CTE SUA 08 (Mandatory regulations).
  • Q.Can the formation and strike of lightning be prevented?
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  • A.No. No device can prevent the formation or strike of lightning. Protection systems are designed to intercept it and safely conduct the discharge to earth. Current standards (IEC 62305, NFPA 780, among others) define how to capture and conduct lightning safely, but to date no study or regulation explains how to prevent a lightning strike.
  • Q.What is the price of a lightning rod?
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  • A.The price of a lightning rod is not fixed, as it depends on the specific characteristics of what needs to be protected. Each installation requires a prior technical analysis to determine the level of risk and the actual protection needs. The cost may vary depending on the size of the structure and the areas to be protected, which may require a larger protection radius, more air terminals, or a greater length of cabling for the installation of down conductors, among other factors. At Reazy, we design customized solutions tailored to each project. A specialist analyzes the installation and defines the most appropriate system to ensure effective protection in compliance with applicable standards. If you would like to know the price of a lightning rod for your specific case, our team can carry out a technical assessment and provide you with a proposal adapted to your needs.
Internal Protection
  • Q.How many down-conductors needs a PDC lightning rod installation?
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  • A.The NFC standards 17102: 2011, UNE 21186: 2011 and NP4426: 20131 indicate that each PDC must be connected to at least two down conductors.
  • Q.What is the minimum separation between down conductors?
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  • A.Two downspouts are considered independent if they do not run parallel, parallel understood as a straight line distance of less than 2m between conductors.
  • Q.Can you install a down conductor inside the building?
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  • A.Yes, when is not possible to be done outside and the cable goes down within a specific insulating conductive and non-flammable.
  • Q.Is it necessary to install a lightning counter in the lightning protection system?
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  • A.The lightning counter installation is necessary to know when the installation has received the lightning strike and thus perform the verification of lightning rods and grounding. You only need to install a lightning counter for installation regardless of the number of down-conductors to earth disposal, the equipment also account for the impact of lightning on the system.
  • Q.It can be used a metal structure as the current shunt element of a lightning?
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  • A.Yes, the exterior steel trusses interconnected (metal structures) can be used as natural drainpipes of external protection systems against lightning, provided that its conductivity is ensured and its impedance is less than or equal to 0.01 Ω.
  • Q.What is a spark gap?
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  • A.A spark gap or ISG isolation (isolating spark gap) is 2 electrodes spaced a certain distance, in order to electrically insulate conductive installation sections. If lightning strikes the plant sections are temporarily connected as a result of response to discharge.
  • Q.What is internal lightning protection?
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  • A.They are the appropriate protection to avoid the surge in the power supply system, communications or data system.
  • Q.What is a surge?
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  • A.It’s an over voltage with a big magnitude, about tens of kV and with a short duration (microseconds). However, they have a highly destructive power on sensitive electronic equipment.
  • Q.How surges originate?
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  • A.They arise mainly as a result of lightning strikes, switching in the networks and/or defects therein.
  • Q.What are the most common causes of occurrence of surges from atmospheric origin?
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  • A.The lightning strikes in the distribution lines or close to, or the lightning strikes in external protection system located in the same building or nearby.
  • Q.What regulations apply to protect against surges?
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  • A.There are different rules and regulations, the most important are the RBT (ITC-BT-23), EN 61643-11: 2012, IEC 62305-4.
  • Q.How can we protect ourselves from surges?
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  • A.The SPD (surge protection devices), are intended to reduce the input surge to a lower value. This is accomplished with a strategy that integrates 3 protection levels: type 1, type 2 and type 3. Thereby achieving a low voltage level not dangerous for the electronic equipment.