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- How does one choose the lightning protection class for risk assessment calculation, and how do you calculate radius of striking sphere & lightining current?
- What is omni potential grounding?
- How can you calculate the resistance-to-ground for a ground ring with rods attached?
- Can you explain the 1/20 probe depth rule when conducting a Wenner 4-pin Soil Resistivity Test?
- What is the best probe spacing’s for soil resistivity testing?
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Category Archives: Lightning & Thunder Storms
How does one choose the lightning protection class for risk assessment calculation, and how do you calculate radius of striking sphere & lightining current?
Hi Sekar, Thank you for your question regarding lightning protection class, it is our pleasure to help. There are a number of different and varied methods of providing protection from lightning strikes, and the selection of which methods to use … Continue reading
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What is the relationship between a Lightning Protection System (LPS) and an Earthing System?
Hi Emmanuel, Thank you for your question regarding earthing systems and lightning protection systems, it is our pleasure to help. Lighting protection systems are an above-grade conductor network designed along the lines of a Faraday Cage, that is used to … Continue reading
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Can a telecom equipment ground be routed through a cable ladder that acts as a metal loop? Does this cause a choke point when lightning hit?
Hi Chanh, Thank you for your question regarding Telco grounding and metal cable ladders, it is our pleasure to help. The short answer is “yes”. You can route Telco grounding conductor in a metal cable ladder (even if it is … Continue reading
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Is it OK to connect the lightning protection system (LPS) to the main grounding system?
Hi Romeo, Thank you for your question regarding lighting protection and electrical grounding systems, it is our pleasure to help. Yes, you must bond your Lightning Protection System (LPS) to your all other grounding systems at your facility. Failure to … Continue reading
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What is the best grounding method(s) for an electrical system located in a basement of a building in a flood zone?
Sharad tells us that: I have a Hotel Project in which grounding has to be done. The Hotel has up to 15 floors. My concern is that the grounding system consisting of transformer and generator will be located in the … Continue reading
Is it true that a concrete foundation pile is acceptable for use as lightning down conductor, but that the leakage current could crack the concrete? What does code say about this?
Hi Salim, Thank you for your question regarding lighting protections systems and concrete pile foundations, it is our pleasure to help. If you read the NFPA 780 (US Lightning Standard) it would appear to not allow the use of pile … Continue reading
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How do you support a lightning protection down leads run in a plenum ceiling?
Justin tells us: I have recently encountered in a new building installation, lightning protection down leads coming from the roof air terminals, and running through the ceiling sleeved in PVC until it is cadwelded on to the building steel structure, … Continue reading
What is the minimum size of down conductor for lightning protection? What is the individual resistance and combine resistance of electrode? What is the resistance of grounding network?
Hi Benjamin, Thank you for your questions regarding lightning protection and grounding resistances, it is our pleasure to help. There are two (2) classes of material requirements found in NFPA 780, the Standard for the Installation of Lightning Protection Systems. … Continue reading
I have a copper lightning ground that comes up and lands on a copper bus (plate). On the other end of the plate is another lightning ground that is connected and runs to the roof. Can I legally use a Tin Plated Crimped Connector from the copper ground coming from the ground and land it to the copper Grounding Bus (plate)? Where can I find the answer in writing?
Hi Don, Thank you for your question regarding grounding via lightning protection systems. It is our pleasure to help. Every known standard from the NFPA 70 National Electrical Code (NEC) to the NFPA 780 Lightning Protection Code to IEEE standards … Continue reading
It is possible to use the rain gutter as a part of the LPS system? In accordance with the IEC 62305 it is, but what is with the NFPA?
Hi Peter, Thank you for your question regarding Lightning Protection Systems (LPS), it is our pleasure to help. The NFPA 780 Standard for the Installation of Lightning Protection Systems refers to “rain gutters” as eave troughs and downspouts in its … Continue reading