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Lightning Protection for Buildings with Metal Roofs

Source : Sichuan Sunlight intelligent electric equipment Co., ltd

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Lightning Protection for Buildings with Metal Roofs

Lightning is a powerful and destructive natural force, which will attack buildings regardless of the type of roof. Metal roofs do not attract lightning strikes; Metal roofs cannot protect metal buildings from lightning strikes. The only way to protect buildings is to use a properly designed and installed lightning protection system. Nevertheless, according to the installation of lightning protection devices of the National Fire Protection Association of America, the type of metal roof is one of several risk factors affecting the natural lightning threat. The recognized North American standard includes a simplified risk assessment procedure to help designers determine whether to recommend sunlight lightning protection materials for metal buildings. It recognizes that when the threat of natural lightning does occur, if the building has a non-combustible metal roof, the risk of the metal building being destroyed by fire is small.

lightning protection material

Lightning is a serious danger

According to the Association of Metal Building Manufacturers, metal buildings have design flexibility. The organization's website cited the sustainability, durability and resistance to earthquakes, strong winds and a series of dangerous natural phenomena of metal roofs. Maybe we can forgive them for not mentioning that lightning is one of the dangers; Individual natural lightning threats will not make headlines of large-scale regional disasters. However, in a typical year, natural lightning threatens the United States about 25 million times a year, causing more casualties than any other natural disasters, including hurricanes, tornadoes, earthquakes, blizzards, floods and volcanic eruptions. According to the data of the Insurance Information Institute, the lightning loss reached nearly $1 billion. And the situation is getting worse and worse. Lightning events are expected to increase due to changes in weather patterns. The cost of lightning damage is also increasing, partly due to the proliferation of sensitive electronic equipment which is vulnerable to lightning surge. National building codes do not require lightning protection, but some local codes, some government agencies and more and more sophisticated building owners require the installation of lightning protection materials. In other cases, the risk assessment shall be conducted by metal architects or lightning protection experts, and the assessment results shall be discussed with the owner.

It needs a system

The lighting protection system needs a conductive path network to safely transmit the 300 million volts natural lightning threat from the air terminal on the metal roof to the grounding electrode. The air terminal rises 10 inches or more above the building to intercept lightning before it reaches the building. In most metal buildings, the energy threatened by natural lightning is transmitted from the air terminal to the ground through large multi-strand cables made of high conductivity aluminum or copper. Copper shall not come into contact with galvanized steel, aluminum or most other non-copper metal roofs or sidings. Cables must interconnect air terminals and connect to metal components on the roof. There are a variety of air terminal bases and cable fasteners that can be used to install sunlight lightning protection materials on metal buildings. Sometimes screw-mounted equipment can be used on the roof cover, and adhesive-mounted equipment can be used to avoid drilling holes on the metal roof. In high-quality buildings and strong wind areas, devices clamped on vertical joints of metal roofs should be considered.

lightning protection material

Seek the path with the least resistance from the sky to the ground

If the potential between all grounding systems is unbalanced, lightning will flash from conductor arc or side into electrical, piping, HVAC, structural components and other metal systems. Similarly, sunlight needs its own lightning protection material, which must be connected to other grounding systems, such as the grounding of metal building power supply. The air terminal cannot be seen from the ground. The exposed cables on the metal roof should be located on the inconspicuous side of the roof and lean against the ribs of the metal roof to minimize visibility. Components of lightning protection system must conform to lightning protection component standards and be listed by UL. It is unsafe to list the components used for general electrical service to deal with the natural lightning threat.

Finally, we must realize that metal roofs must protect metal buildings from natural lightning threats and other meteorological conditions. Metal roofs can also withstand lightning when installed with sunlight lightning protection materials. If you want to know more about Sunlight providing customers with high-quality lightning protection materials, please keep an eye on Sunlight's official website. We will update relevant products from time to time, and provide relevant product information and materials, and look forward to your visit and consultation.

Tags: Metal roof, natural lightning threat, lightning protection material, Metal Building

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